CN101369848B - Method for monitoring optical transmission network multiplex section and optical passage signal quality - Google Patents
Method for monitoring optical transmission network multiplex section and optical passage signal quality Download PDFInfo
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Abstract
The invention relates to a method for monitoring an optical transport network multiplex section and an optical channel signal quality. At a transmitting terminal, n Txs transform an OUT signal to an OCh signal. An OMS signal is formed through multiplexing of a combiner and transmitted into an optical amplifier to be an OTS signal. The device jointly transmitting the OOS information with said three layers along with the OCh signal from an optical monitoring channel disc through an optical monitoring channel. At a receiving terminal, the OSC signal is decomposed before the optical amplification, the OTS signal is unloaded to the OMS signal, and an optical property monitoring module receives an optical signal property monitor. The OMS signal is decomposed to the OCh signal by a partial-wave device and the OCh signal is transmitted to each Rx unit to be recovered to an OUT signal. In order to realize the purpose of monitoring of the OTN optical domain signal quality by the optical transmission physical property, the invention transmits a CNI and a CSI informations by using the OSC. According to the invention the problem of the quality monitoring of the OTN optical domain signal is solved. The method for monitoring the optical transport network multiplex section and the optical channel signal quality of the invention has very obvious role on strengthening the management ability of the OTN network and improving the maintenance level of the network and signal transmission quality.
Description
Technical field
The present invention relates to the method for a kind of monitoring optical transmission network multiplex section and optical passage signal quality, can be applicable to optical transfer network (OTN) system.
Background technology
As the high-end transmission system of wide band multi-business optical-fiber network, OTN just progressively bears the important task of optical communication backbone transport network system.With respect to current dwdm system and SDH system, it is strong that OTN has the service bearer ability, transport tape is roomy, channel rate is high, the scheduling particle is big, network management with maintenance costs is many, the system monitoring ability by force, subdivision connects the characteristics such as simple that concern.Owing to adopt the asynchronous transmission system, so OTN has network system characteristic of simple with respect to SDH, simultaneously owing in frame overhead, added forward error correction technique (FEC), so have very strong no regenerative transmission ability, be specially adapted to adopt the DWDM technology to carry out the signal transmission of ultra long haul with Optical Amplification Technology.Aspect the service bearer ability, OTN has defined the multiple business bearer types, can directly carry the professional and ten thousand mbit ethernet business of SDH of the above speed of 2.5Gbps, and have the technological means of other multiple business of carrying.In the OTN signal architecture, define OTS, OMS, OCh, OTU, ODU, OPU many signals layers such as (optical transmission section, optical multiplexing section, optical channel layer, optical transport unit, light data cell, light load cells), and had relevant network management and monitoring means separately.With regard to the signal layering, OTS, OMS, OCh are in the light signal territory, and OTU, ODU, OPU are in signal of telecommunication territory.At each layer of electric territory, definition has forward error correction and section monitoring overhead among the OTU, definition has six Tandem Connection Monitor and channel monitoring expense among the ODU, and then definition has payload structural identification, Payload Type Identifier, mapping to specify expense etc. in OPU, has extremely strong managerial ability.At each layer of light territory owing to have only several limited defectives to indicate expenses, the quality of signals monitoring capacity relatively a little less than.
OTN to light territory signal quality monitoring capacity than weak source in its to the monitoring capability of light territory signal relatively a little less than, the signal of different rates grade and different modulating mode in addition, its transmittability difference is very big, so be difficult to carry out monitoring analysis.Whether the defined signal supervision to each layer of light territory of OTN at present all can only supervise signal and lose, and to signal whether deterioration, how much transmit surplus in addition, whether need to carry out problem such as early warning and all can't be answered, lack effective management means.
Summary of the invention
Purpose of the present invention just is to propose the method for a kind of monitoring optical transmission network multiplex section and optical passage signal quality, may further comprise the steps:
Step a, node A place at optical transfer network OTN, each sends optical convering unit Tx optical transmission unit OTU signal is converted into optical channel layer OCh signal, after closing ripple, wave multiplexer (as array fiber waveguide AWG) becomes optical multiplexing section OMS signal, and as optical transmission section OTS signal friendship light amplification OA amplification, merge with the Optical Supervisory Channel osc signal then and send into optical transmission chain, carry the light delivery module overhead signal OOS information of sending here by webmaster in the osc signal, the expense indication information that OOS information comprises has: optical channel number indication CNI, light path is indicated CSI at interval, optical link physical parameter indication OPI; OPI comprises that passage dispersion tolerance indication CDI, passage polarization mode dispersion tolerance limit indication PMDI, passage receive Optical Signal To Noise Ratio tolerance limit indication OSNI, channel spectrum width indication SWI;
Step b, Node B place at optical transfer network OTN, the equipment received signal also is decomposed into OMS payload and expense with it, wherein payload send OA to amplify, expense is sent the OSC unit to extract and is respectively sent the signal indication information, and these are sent signal indication informations deliver network management unit NMU, CNI then send OA with auxiliary its work; Send optical property detection module OPM to carry out the monitoring of link transmission physical property through the payload part that OA amplifies, and send NMU to analyze the data monitored, another part send channel-splitting filter (as AWG) that it is decomposed into each OCh signal, and hands over the corresponding optical convering unit Rx that receives to revert to the OTU signal each OCh signal;
Step c, NMU will compare analysis with the link channel performance monitoring data of being sent here by OPM by the signal indication information that respectively sends that the OSC unit is sent here, send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, receive Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert.
Wherein CNI, CSI place OMS expense piece, and OPI places OCh expense piece; Perhaps CNI, CSI place outside the OMS expense piece, and OPI places outside the OCh expense piece.
Preferably, wherein also carried in initialized link dispersion surplus, the link polarization mode dispersion balance information at least one in the osc signal.
Preferably, also comprise step a1 between step a and the b, at least one light amplification is set between node A and Node B, or at least one Optical Add Drop Multiplexer node C, node C receives the signal of sending here by node A, after amplifying, continue to transmit to Node B, take out CNI among the OSC simultaneously with the work of auxiliary OA, and extract the link dispersion surplus that node A transmits, the polarization mode dispersion balance information, this section optical transmission chain chromatic dispersion in conjunction with network configuration, the chromatic dispersion compensation quantity of link polarization mode dispersion and node C, polarization mode dispersion (PMD) compensation amount information is by the link dispersion surplus, after the calculating of link polarization mode dispersion surplus the result is transmitted to Node B.
Preferably, wherein step b also comprises, chromatic dispersion compensation quantity, the polarization mode dispersion (PMD) compensation amount information of the chromatic dispersion of this section optical transmission chain, link polarization mode dispersion and the Node B of link dispersion surplus, link polarization mode dispersion balance information and network configuration are calculated link dispersion surplus, polarization mode dispersion surplus jointly.
Preferably, wherein step c is specially, the CDI that NMU will be sent here by the OSC unit, PMDI and through link dispersion surplus that link transmission and monitoring calculation obtained, link polarization mode dispersion surplus is through adding the chromatic dispersion of this section optical transmission chain, the compensation rate of link polarization mode dispersion and Node B is analyzed comparison after calculating, to send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, the reception Optical Signal To Noise Ratio of sending here by OPM, channel wavelength monitoring information and the CNI that sends here by the OSC unit, CSI, SWI information compares analysis, receives Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert to send.
Preferably, also comprise step a2 between step a and the b, OTN also comprises node D and node E, also comprise step a2 between step a and the b, light modulation node F is set on optical transmission chain, light modulation node F with signal before node D or E scheduling, to the signal quality that is about to be dispatched to node D or E by to chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, receive Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert and carry out Pre-Evaluation one time, if assessment result does not have early warning then to carry out service dispatching, if assessment result finds have early warning then to stop service dispatching.
The present invention also proposes the method for a kind of monitoring optical transmission network multiplex section and optical passage signal quality, may further comprise the steps:
Step a, node A place at optical transfer network OTN, each sends optical convering unit Tx optical transmission unit OTU signal is converted into optical channel layer OCh signal, after closing ripple, wave multiplexer (as AWG) becomes optical multiplexing section OMS signal, and as optical transmission section OTS signal friendship light amplification OA amplification, merge with the Optical Supervisory Channel osc signal then and send into optical transmission chain, carry light delivery module overhead signal OOS information and the initialized link dispersion surplus sent here by webmaster in the osc signal, link polarization mode dispersion surplus, in the link equivalence optical noise coefficient information at least one, the expense indication information that OOS information comprises has: optical channel number indication CNI, light path is indicated CSI at interval, optical link physical parameter indication OPI; OPI comprises that passage dispersion tolerance indication CDI, passage polarization mode dispersion tolerance limit indication PMDI, passage receive Optical Signal To Noise Ratio tolerance limit indication OSNI, channel spectrum width indication SWI;
Step b, Node B place at optical transfer network OTN, the equipment received signal also is decomposed into OMS payload and expense with it, wherein payload send OA to amplify, expense is sent the OSC unit to extract and is respectively sent the signal indication information, and these are sent signal indication informations deliver network management unit NMU, CNI then send OA with auxiliary its work, link dispersion surplus, link polarization mode dispersion surplus, this section optical transmission chain chromatic dispersion of equivalent noise coefficient information and network configuration, the chromatic dispersion compensation quantity of link polarization mode dispersion and Node B, the polarization mode dispersion (PMD) compensation amount, the attenuation of noise of optical amplifier coefficient and this section optical transmission chain of monitoring, the gain information of image intensifer calculates the link dispersion surplus jointly, link polarization mode dispersion surplus, receive Optical Signal To Noise Ratio; The payload that amplifies through OA then send channel-splitting filter (as AWG) that it is decomposed into each OCh signal, and hands over the corresponding optical convering unit Rx that receives to revert to the OTU signal each OCh signal;
Step c, NMU will respectively be sent the signal indication information and be analyzed comparison by link dispersion surplus, link polarization mode dispersion surplus, reception Optical Signal To Noise Ratio that link transmission and monitoring calculation obtained by what the OSC unit was sent here, to send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert and to receive Optical Signal To Noise Ratio information and Threshold Crossing Alert.
Wherein CNI, CSI place OMS expense piece, and OPI places OCh expense piece; Perhaps CNI, CSI place outside the OMS expense piece, and OPI places outside the OCh expense piece.
Preferably, OTN also comprises node D and node E, also comprise step a2 between step a and the b, light modulation node F is set on optical transmission chain, light modulation node F with signal before node D or E scheduling, to the signal quality that is about to be dispatched to node D or E by to chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, receive Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert and carry out Pre-Evaluation one time, if assessment result does not have early warning then to carry out service dispatching, if assessment result finds have early warning then to stop service dispatching.
The mode of the present invention by monitoring OTN flashlight transmitting physical performance realizes the monitoring to OMS, OCh signal quality.Because there is very big difference in the ability to bear of OTN optical signal transmission physical property, is difficult to the decision signal quality, so just need binding signal physical quantity transmission margin could solve judgement preferably to signal quality.Because mainly by the transmitting terminal decision, the monitoring of signal then substantially all is in receiving terminal to the transmission margin of signal physical quantities, so need to solve the intercommunication problem of two end signals.Though by webmaster can be directly in the transmission margin parameter of receiving terminal configures physical amount, yet signal demand carry out flexible dispatching or signal when striding the transmission of the management network segment by network management configuration difficulty comparatively just.So, for making the signal quality monitoring be applicable to the application scenarios of most of networks, the present invention at first is exactly the physical parameter transmission margin expense that increases OCh, OMS layer, relevant each layer carried away the transmission link physical property limit that signal can bear at transmitting terminal, transmit jointly with service signal, and, comparing with the monitoring analysis data of relevant physical parameter monitoring equipment again, thereby the purpose of realization pilot signal quality in the receiving terminal reception.
The method of the invention is monitored the signal quality of OCh, OMS layer on the link physical amount ability to bear in light territory, realized not having as yet in the world the monitoring of the OTN light territory signal quality of good solution, to strengthening OTN Network Management ability, the maintenance levels and the signal transmission quality that improve network all have fairly obvious effect, are one and solve the good technique scheme that the OTN system is retained problem.
Description of drawings
Fig. 1, OTN network constitute and light territory layering signal;
Fig. 2, the expense structural representation of OTN light territory;
Fig. 3, OCH path termination source end correlation function;
Fig. 4, OMS path termination source end correlation function;
Fig. 5, OCH path termination place end correlation function;
Fig. 6, OMS path termination place end correlation function;
Fig. 7, OTN optical channel and optical multiplexing section signal quality monitoring embodiment two;
Fig. 8, OTN optical channel and optical multiplexing section signal quality monitoring embodiment three;
Fig. 9, OTN optical channel and optical multiplexing section signal quality monitoring embodiment four.
AWG array fiber waveguide
The indication of CDI channel link dispersion tolerance
The NMU network management unit
The OA light amplification
The OADM Optical Add Drop Multiplexer
The OCh optical channel
The OMS optical multiplexing section
The indication of CNI optical channel number
The CSI light path is indicated at interval
OOS light delivery module expense overhead signal
The indication of OPI optical link physical parameter
The monitoring of OPM optical property
The OSC Optical Supervisory Channel
The OSNI passage receives the indication of Optical Signal To Noise Ratio tolerance limit
The OTU optical transport unit
The indication of PMDI channel link polarization mode dispersion tolerance limit
Rx receives light and transmits
The indication of SWI channel spectrum width
Tx sends light and transmits
Embodiment
The complete function model of OTN is exactly a dwdm system on the light territory, and its main network equipment formation and the layering of light territory are as shown in Figure 1.N sends optical convering unit (Tx) the OTU signal is converted into the OCh signal, close ripple by wave multiplexer (as AWG) and become the OMS signal, sending into image intensifer becomes the OTS signal, and equipment is transmitted above-mentioned three layers light delivery module overhead signal (OOS) in company with the OCh signal through Optical Supervisory Channel jointly by Optical Supervisory Channel unit (OSC).At receiving terminal, before light amplification, decomposite osc signal, OTS signal unloading is the OMS signal, and carries out the receiving optical signals performance monitoring that the OMS signal is decomposed into the OCh signal and send through channel-splitting filter (as AWG) and respectively receives optical convering unit (Rx) and revert to the OTU signal with light performance monitoring module (OPM).When there was the Optical Add Drop Multiplexer node device in transmission system, by the OCh signal of this node, its effect was identical with the amplification node with working method for directly; For the OCh signal that node thus inserts, it is identical that its effect and working method and signal close ripple sending node (as node A); For the OCh signal of talking about under this node, its effect is identical with signal partial wave receiving node (as Node B) with working method.
For realizing purpose with optical transmission physical property monitoring OTN light territory signal quality, the present invention utilizes OSC transmission CNI, CSI (indication of light path number, light path are indicated at interval) and OPI information such as (indications of optical link physical parameter), CNI, CSI and OPI can be placed OMS and OCh expense piece respectively.Wherein mainly comprise CDI, PMDI, OSNI and SWI expense indication informations such as (indication of passage dispersion tolerance, the indication of passage polarization mode dispersion tolerance limit, passage receive the indication of Optical Signal To Noise Ratio tolerance limit, the indication of channel spectrum width) in the OPI expense, as shown in Figure 2.Above-mentioned indication information is also belonged to the present invention in the mode beyond OMS, the OCh expense piece by the OSC channel transfer protect category.
Newly-increased OMS expense CNI, CSI respectively account for a byte, and wherein CSI is unit record OMS multiplexed optical channel spacing with GHz; Newly-increased OCh expense OPI is the multi-frame structure that occupies 16 bytes, wherein first byte (OPI[0]) is the frame alignment start byte, is defined as complete zero OSNI and occupies OPI[1] and OPI[2], and definition OPI[1] be integer part, OPI[2] be fractional part, unit is dB; CDI occupies OPI[3] and OPI[4], and being defined as short integer, unit is ps; PMDI occupies OPI[5] and OPI[6], and definition OPI[5] be integer part, OPI[6] be fractional part, unit is ps; SWI occupies OPI[7], unit is advisable with GHz, also can be
(nm 1/10th).The 9th byte of OPI is the User Defined byte to a last byte (OPI[8]～OPI[15]).
In the functional module of optical transfer network systems equipment, the present invention has increased insertion, taking-up and the signal quality analytic function of associated overhead respectively in modules such as OCH path termination source end function, OMS path termination source end function, OCH path termination place end function, OMS path termination place end function, as Fig. 3, Fig. 4, Fig. 5, shown in Figure 6.
Shown in Figure 3 is to be inserted among the OOS at the indication informations such as CDI, PMDI, OSNI and SWI that the source end of OCH path termination is sent webmaster here;
Shown in Figure 4 is to be inserted among the OOS at CNI, CSI indication information that the source end of OMS path termination is sent webmaster here;
The indication informations such as CDI, PMDI, OSNI and SWI that are Su Duan in OCH path termination carries in OOS shown in Figure 5 take out, the direct net carrying pipe of SWI wherein, CDI, PMDI, OSNI then carry out the signal quality analysis with the common feed signals mass analysis cell of the received signal performance information that is monitored by the OPM unit, and, the signal quality of OCh layer is monitored the form net carrying pipe of analysis result with chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, reception Optical Signal To Noise Ratio information and Threshold Crossing Alert;
CNI, the CSI indication information that is Su Duan in OMS path termination carries in OOS shown in Figure 6 takes out, the direct net carrying pipe of CNI wherein, CSI then carries out the signal quality analysis with the received signal performance information that is monitored by the OPM unit and by the common feed signals mass analysis cell of SWI information that the place end functional module of OCH path termination is sent here, and, the signal quality of OMS layer is monitored the form net carrying pipe of analysis result with wave length shift and Threshold Crossing Alert;
The main monitoring channel link dispersion of OPM, channel link polarization mode dispersion, passage receive all or part of information such as Optical Signal To Noise Ratio, passage luminous power and channel wavelength.It can directly be monitored link performance and receiving optical signals performance, also can analyze reckoning by the physical property of each OTS of link.
Wherein the analysis calculation method of channel link chromatic dispersion is: each OTS optical transmission line chromatic dispersion sum deducts each dispersion compensation module chromatic dispersion compensation quantity summation;
The channel link polarization mode dispersion square computational methods be: square sum of each OTS optical transmission line polarization mode dispersion deducts each polarization mode dispersion (PMD) compensation module for compensating amount square sum;
Passage receives calculating link equivalence optical noise coefficients such as Optical Signal To Noise Ratio then can decay by each OTS transmission link, the gain of each fiber amplifier, noise factor, calculates with the difference of transmitting optical power and quantum noise again;
Channel wavelength then can only be monitored by the wavelength monitoring module;
CNI is then in order to instruct the work of each OTS image intensifer of link.
The chromatic dispersion surplus can the apprizing system link dispersion to the influence of OCh signal quality, when the absolute value of chromatic dispersion surplus surpasses CDI, or the chromatic dispersion surplus surpasses CDI, or the negative dispersion surplus is when surpassing the CDI and a factor (this factor is smaller or equal to 1) long-pending, then send the Threshold Crossing Alert of chromatic dispersion surplus, with the decline of alarm signal quality;
The polarization mode dispersion surplus can the polarization mode dispersion of apprizing system link to the influence of OCh signal quality, when the polarization mode dispersion surplus surpasses PMDI, send the Threshold Crossing Alert of polarization mode dispersion surplus, with the decline of alarm signal quality;
Receive Optical Signal To Noise Ratio and can receive the influence of Optical Signal To Noise Ratio by the apprizing system link, when receiving Optical Signal To Noise Ratio, then send and receive the Optical Signal To Noise Ratio Threshold Crossing Alert, with the decline of alarm signal quality less than OSNI to the OCh signal quality;
Wave length shift then is the deviation between channel center's wavelength and the passage nominal wavelength; When this deviation surpasses 10% during with the value that difference limited of the half value of SWI of CSI, then the aggravation disturbed between ripple/partial wave performance decrease and the adjacency channel influence to the OMS signal quality is closed in wave length shift Threshold Crossing Alert indication.
When carrying out link dispersion, link polarization mode dispersion with the link transmission parameter of gathering and receiving the Optical Signal To Noise Ratio calculation mode realizing the signal quality assessment, not only can be used for the monitoring of OMS, OCh signal quality, also can be used for estimating of signal quality.The scheduling that can be used for service signal of estimating of sort signal quality recovers with protection.
Embodiment one:
As shown in Figure 1, each Tx of node A is converted into the OCh signal with the OTU signal, becomes the OMS signal after wave multiplexer (as AWG) closes ripple, and hands over OA to amplify as the OTS signal, merges with osc signal then and sends into optical transmission chain.Just carry the OOS information of sending here by webmaster among the OSC here, wherein included CNI, CSI and CDI, PMDI, OSNI, SWI expense indication information.
In Node B, equipment receives the signal of the node A that is sent here by optical transmission chain, and it is decomposed into OMS payload and expense, wherein payload send OA to amplify, expense is sent the OSC unit to extract and is respectively sent the signal indication information, and these are sent signal indication informations deliver NMU, CNI then send OA with auxiliary its work.Send OPM to carry out the monitoring of link transmission physical property through the payload part that OA amplifies, and send NMU to analyze data monitored; Another part send channel-splitting filter (as AWG) that it is decomposed into each OCh signal, and hands over corresponding Rx to revert to the OTU signal each OCh signal.NMU will respectively be sent the signal indication information and be sent here link channel performance monitoring data by OPM and compare analysis by what the OSC unit was sent here, sends chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, reception Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert.
Embodiment two:
As shown in Figure 7, each Tx of node A is converted into the OCh signal with the OTU signal, becomes the OMS signal after wave multiplexer (as AWG) closes ripple, and hands over OA to amplify as the OTS signal, merges with osc signal then and sends into optical transmission chain.Just carry information such as the OOS information sent here by webmaster and initialized link dispersion surplus, polarization mode dispersion surplus among the OSC here, included expense indication informations such as CNI, CSI and CDI, PMDI, OSNI, SWI among the OOS.
Each link intermediate node such as node C receive the signal of sending here by optical transmission chain, after amplifying, continue to transmit downstream, take out CNI among the OSC simultaneously with the work of auxiliary OA, and extract link dispersion surplus, the polarization mode dispersion balance information that the upstream is transmitted, in conjunction with information such as the chromatic dispersion compensation quantity of the chromatic dispersion of this section optical transmission chain, link polarization mode dispersion and this node of network configuration, polarization mode dispersion (PMD) compensation amounts, after the calculating by link dispersion surplus, polarization mode dispersion surplus the result is transmitted downstream.
In Node B, equipment receives the signal of being sent here by optical transmission chain, and it is decomposed into OMS payload and expense, wherein payload send OA to amplify, expense is sent the OSC unit to extract and is respectively sent the signal indication information, and these information are delivered NMU, wherein CNI then send OA with auxiliary its work, and information such as the chromatic dispersion compensation quantity of the chromatic dispersion of this section optical transmission chain, link polarization mode dispersion and this node of information such as link dispersion surplus, link polarization mode dispersion surplus and network configuration, polarization mode dispersion (PMD) compensation amount are calculated link dispersion surplus, polarization mode dispersion surplus jointly.Send OPM to receive Optical Signal To Noise Ratio and channel wavelength monitoring through the payload part that OA amplifies, and send NMU to analyze the data that monitor; Another part send channel-splitting filter (as AWG) that it is decomposed into each OCh signal, and hands over corresponding Rx to revert to the OTU signal each OCh signal.CDI, the PMDI that NMU will be sent here by the OSC unit and analyze comparison after calculating through link dispersion surplus, the compensation rate of link polarization mode dispersion surplus through adding the chromatic dispersion of this section optical transmission chain, polarization mode dispersion and this node that link transmission and monitoring calculation obtained is to send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert.Send here by OPM and to receive Optical Signal To Noise Ratio and then compare analysis, to send reception Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert with the OSNI that sends here by the OSC unit, CSI, SWI information with the channel wavelength monitoring information.
If node C is OADM, then to each straight-through OCh signal, its working method is consistent with effect and OA; For each the OCh signal that inserts, its effect and working method are with to close the ripple sending node the same; For each OCh signal of last words, its effect is the same with a partial wave receiving node with working method.
Embodiment three:
As shown in Figure 8, each Tx of node A is converted into the OCh signal with the OTU signal, becomes the OMS signal after wave multiplexer (as AWG) closes ripple, and hands over OA to amplify as the OTS signal, merges with osc signal then and sends into optical transmission chain.Just carry information such as the OOS information sent here by webmaster and initialized link dispersion surplus, polarization mode dispersion surplus, equivalent noise coefficient among the OSC here, included expense indication informations such as CNI, CSI and CDI, PMDI, OSNI, SWI among the OOS.
Each link intermediate node such as node C receive the signal of sending here by optical transmission chain, after amplifying, continue to transmit downstream, take out CNI among the OSC simultaneously with the work of auxiliary OA, and extract the link dispersion surplus that the upstream is transmitted, the polarization mode dispersion surplus, the equivalent noise coefficient information is with this section optical transmission chain chromatic dispersion of network configuration, the chromatic dispersion compensation quantity of link polarization mode dispersion and Node B, the polarization mode dispersion (PMD) compensation amount, the attenuation of noise of optical amplifier coefficient and this section optical transmission chain of monitoring, information such as the gain of image intensifer are jointly by the link dispersion surplus, link polarization mode dispersion surplus, transmit downstream after the calculating of link equivalence optical noise coefficient.
In Node B, equipment receives the signal of being sent here by optical transmission chain, and it is decomposed into OMS payload and expense, wherein payload send OA to amplify, expense send the OSC unit to extract each relevant information, and these information are delivered NMU, CNI then send OA with auxiliary its work, link dispersion surplus, link polarization mode dispersion surplus, this section optical transmission chain chromatic dispersion of link equivalence optical noise coefficient information and network configuration, the chromatic dispersion compensation quantity of link polarization mode dispersion and this node, the polarization mode dispersion (PMD) compensation amount, the attenuation of noise of optical amplifier coefficient and this section optical transmission chain of monitoring, information such as the gain of image intensifer are calculated the link dispersion surplus jointly, the polarization mode dispersion surplus, receive Optical Signal To Noise Ratio.The payload that amplifies through OA then send channel-splitting filter (as AWG) that it is decomposed into each OCh signal, and hands over corresponding Rx to revert to the OTU signal each OCh signal.NMU will respectively be sent the signal indication information and be analyzed comparison by link dispersion surplus, polarization mode dispersion surplus, reception Optical Signal To Noise Ratio that link transmission and monitoring calculation obtained by what the OSC unit was sent here, to send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert and to receive Optical Signal To Noise Ratio information and Threshold Crossing Alert.
Embodiment four:
As shown in Figure 9, each Tx of node A is converted into the OCh signal with the OTU signal, becomes the OMS signal after wave multiplexer (as AWG) closes ripple, and hands over OA to amplify as the OTS signal, merges with osc signal then and sends into optical transmission chain.Just carry information such as the OOS information sent here by webmaster and initialized link dispersion surplus, link polarization mode dispersion surplus, equivalent noise coefficient among the OSC here, included expense indication informations such as CNI, CSI and CDI, PMDI, OSNI, SWI among the OOS.
Light modulation node F transmits signal dispatching to Node B, identical with the monitoring mode of above-mentioned three embodiment to the signal quality monitoring through this transmission link.And light modulation node F desire with signal before node D scheduling, can carry out Pre-Evaluation one time to the signal quality that is about to be dispatched to node D in the mode of embodiment three.If assessment result is good and do not have early warning then to carry out signal dispatching,, in order to avoid the signal dispatching failure, or change to walk other route and reappraise and dispatch if then termination signal scheduling of early warning appears in assessment result.If signal also can need be handled to node E scheduling equally through node C.
Claims (10)
1. the method for monitoring optical transmission network multiplex section and optical passage signal quality is characterized in that may further comprise the steps:
Step a, node A place at optical transfer network OTN, each sends optical convering unit Tx optical transmission unit OTU signal is converted into optical channel layer OCh signal, after closing ripple, wave multiplexer becomes optical multiplexing section OMS signal, and as optical transmission section OTS signal friendship light amplification OA amplification, merge with the Optical Supervisory Channel osc signal then and send into optical transmission chain, carry the light delivery module overhead signal OOS information of sending here by webmaster in the osc signal, the expense indication information that OOS information comprises has: optical channel number indication CNI, light path is indicated CSI at interval, optical channel link physical parameter indication OPI; OPI comprises that passage dispersion tolerance indication CDI, passage polarization mode dispersion tolerance limit indication PMDI, passage receive Optical Signal To Noise Ratio tolerance limit indication OSNI, channel spectrum width indication SWI;
Step b, Node B place at optical transfer network OTN, the equipment received signal also is decomposed into OMS payload and expense with it, wherein payload send OA to amplify, expense is sent the OSC unit to extract and is respectively sent the signal indication information, and these are sent signal indication informations deliver network management unit NMU, CNI then send OA with auxiliary its work; Send optical property detection module OPM to carry out the monitoring of link transmission physical property through the payload part that OA amplifies, and send NMU to analyze the data monitored, another part send channel-splitting filter that it is decomposed into each OCh signal, and hands over the corresponding optical convering unit Rx that receives to revert to the OTU signal each OCh signal;
Step c, NMU will compare analysis with the link channel performance monitoring data of being sent here by OPM by the signal indication information that respectively sends that the OSC unit is sent here, send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, receive Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert.
2. the method for monitoring optical transmission network multiplex section according to claim 1 and optical passage signal quality, wherein CNI, CSI place OMS expense piece, and OPI places OCh expense piece; Perhaps CNI, CSI place outside the OMS expense piece, and OPI places outside the OCh expense piece.
3. the method for monitoring optical transmission network multiplex section according to claim 1 and 2 and optical passage signal quality has wherein also been carried at least one in initialized link dispersion surplus, the link polarization mode dispersion balance information in the osc signal.
4. the method for monitoring optical transmission network multiplex section according to claim 3 and optical passage signal quality, also comprise, also comprise step a1 between step a and the b, optical transmission chain is provided with at least one light amplification, or at least one Optical Add Drop Multiplexer node C, node C receives the signal of sending here by node A, after amplifying, continue to transmit to Node B, take out CNI among the OSC simultaneously with the work of auxiliary OA, and extract the link dispersion surplus that node A transmits, link polarization mode dispersion balance information, this section optical transmission chain chromatic dispersion in conjunction with network configuration, the chromatic dispersion compensation quantity of link polarization mode dispersion and node C, polarization mode dispersion (PMD) compensation amount information is by the link dispersion surplus, after the calculating of link polarization mode dispersion surplus the result is transmitted to Node B.
5. the method for monitoring optical transmission network multiplex section according to claim 4 and optical passage signal quality, wherein step b also comprises, the chromatic dispersion compensation quantity of the chromatic dispersion of this section optical transmission chain, link polarization mode dispersion and the Node B of link dispersion surplus, link polarization mode dispersion balance information and network configuration, polarization mode dispersion (PMD) compensation amount information are calculated link dispersion surplus, link polarization mode dispersion surplus jointly.
6. the method for monitoring optical transmission network multiplex section according to claim 5 and optical passage signal quality, wherein step c is specially, the CDI that NMU will be sent here by the OSC unit, PMDI and through link dispersion surplus that link transmission and monitoring calculation obtained, link polarization mode dispersion surplus is through adding the chromatic dispersion of this section optical transmission chain, the compensation rate of link polarization mode dispersion and Node B is analyzed comparison after calculating, to send link dispersion balance information and Threshold Crossing Alert, link polarization mode dispersion balance information and Threshold Crossing Alert, the reception Optical Signal To Noise Ratio of sending here by OPM, channel wavelength monitoring information and the OSNI that sends here by the OSC unit, CSI, SWI information compares analysis, receives Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert to send.
7. according to the method for claim 1 or 2 or 4 described monitoring optical transmission network multiplex sections and optical passage signal quality, wherein OTN also comprises node D and node E, also comprise step a2 between step a and the b, light modulation node F is set on optical transmission chain, light modulation node F with signal before node D or E scheduling, to the signal quality that is about to be dispatched to node D or E by to chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, receive Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert and carry out Pre-Evaluation one time, if assessment result does not have early warning then to carry out service dispatching, if assessment result finds have early warning then to stop service dispatching.
8. the method for monitoring optical transmission network multiplex section and optical passage signal quality is characterized in that may further comprise the steps:
Step a, node A place at optical transfer network OTN, each sends optical convering unit Tx optical transmission unit OTU signal is converted into optical channel layer OCh signal, after closing ripple, wave multiplexer becomes optical multiplexing section OMS signal, and as optical transmission section OTS signal friendship light amplification OA amplification, merge with the Optical Supervisory Channel osc signal then and send into optical transmission chain, carry light delivery module overhead signal OOS information and the initialized link dispersion surplus sent here by webmaster in the osc signal, link polarization mode dispersion surplus, in the link equivalence optical noise coefficient information at least one, the expense indication information that OOS information comprises has: optical channel number indication CNI, light path is indicated CSI at interval, optical link physical parameter indication OPI; OPI comprises that passage dispersion tolerance indication CDI, passage polarization mode dispersion tolerance limit indication PMDI, passage receive Optical Signal To Noise Ratio tolerance limit indication OSNI, channel spectrum width indication SWI;
Step b, Node B place at optical transfer network OTN, the equipment received signal also is decomposed into OMS payload and expense with it, wherein payload send OA to amplify, expense is sent the OSC unit to extract and is respectively sent the signal indication information, and these are sent signal indication informations deliver network management unit NMU, CNI then send OA with auxiliary its work, link dispersion surplus, link polarization mode dispersion surplus, this section optical transmission chain chromatic dispersion of link equivalence optical noise coefficient information and network configuration, the chromatic dispersion compensation quantity of link polarization mode dispersion and Node B, the polarization mode dispersion (PMD) compensation amount, the attenuation of noise of optical amplifier coefficient and this section optical transmission chain of monitoring, the gain information of image intensifer calculates the link dispersion surplus jointly, the polarization mode dispersion surplus, receive Optical Signal To Noise Ratio; The payload that amplifies through OA then send channel-splitting filter that it is decomposed into each OCh signal, and hands over the corresponding optical convering unit Rx that receives to revert to the OTU signal each OCh signal;
Step c, NMU will respectively be sent the signal indication information and be analyzed comparison by link dispersion surplus, link polarization mode dispersion surplus, reception Optical Signal To Noise Ratio that link transmission and monitoring calculation obtained by what the OSC unit was sent here, to send chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert and to receive Optical Signal To Noise Ratio information and Threshold Crossing Alert.
9. the method for monitoring optical transmission network multiplex section according to claim 8 and optical passage signal quality, wherein CNI, CSI place OMS expense piece, and OPI places OCh expense piece; Perhaps CNI, CSI place outside the OMS expense piece, and OPI places outside the OCh expense piece.
10. according to Claim 8 or the method for 9 described monitoring optical transmission network multiplex sections and optical passage signal quality, wherein OTN also comprises node D and node E, also comprise step a2 between step a and the b, light modulation node F is set on optical transmission chain, light modulation node F with signal before node D or E scheduling, to the signal quality that is about to be dispatched to node D or E by to chromatic dispersion balance information and Threshold Crossing Alert, polarization mode dispersion balance information and Threshold Crossing Alert, receive Optical Signal To Noise Ratio information and Threshold Crossing Alert and wave length shift and Threshold Crossing Alert and carry out Pre-Evaluation one time, if assessment result does not have early warning then to carry out service dispatching, if assessment result finds have early warning then to stop service dispatching.
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| CN101534164B (en) * | 2009-04-21 | 2012-01-04 | 华为技术有限公司 | Method and system for transmitting signal by optical transmitting network |
| FR2949284B1 (en) * | 2009-08-24 | 2011-09-09 | Alcatel Lucent | REPRESENTATION OF PHYSICAL DEGRADATION IN AN OPTICAL COMMUNICATION NETWORK |
| JP5471241B2 (en) * | 2009-09-28 | 2014-04-16 | 沖電気工業株式会社 | Optical signal quality monitoring device |
| CN102843194B (en) * | 2012-09-12 | 2015-09-30 | 武汉邮电科学研究院 | The Dispersion Compensation Systems of wavelength-selective switches type ROADM and method |
| CN103840906B (en) * | 2014-02-25 | 2017-01-25 | 烽火通信科技股份有限公司 | OTN system and method supporting supervisory channel light single-optical-fiber bidirectional transmission |
| CN106331905A (en) * | 2015-06-24 | 2017-01-11 | 中兴通讯股份有限公司 | Wavelength division network optical layer management method, system and device |
| CN109257093B (en) * | 2017-07-14 | 2021-09-14 | 华为技术有限公司 | Method and device for processing optical monitoring channel in optical network |
| CN108712207B (en) * | 2018-04-17 | 2020-05-05 | 烽火通信科技股份有限公司 | Method and system for managing link and service |
| CN113206703B (en) * | 2021-04-19 | 2022-06-03 | 烽火通信科技股份有限公司 | Wavelength division multiplexing chromatic dispersion and polarization mode dispersion monitoring method and device |
| CN114374429B (en) * | 2021-12-08 | 2023-07-04 | 武汉光迅科技股份有限公司 | C++ band EDFA device with single-fiber bidirectional OSC |
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