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WO2018123650A1 - Procédé de réglage de longueur d'onde d'un signal multiplexé en longueur d'onde, et système de transmission optique - Google Patents

Procédé de réglage de longueur d'onde d'un signal multiplexé en longueur d'onde, et système de transmission optique Download PDF

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Publication number
WO2018123650A1
WO2018123650A1 PCT/JP2017/045085 JP2017045085W WO2018123650A1 WO 2018123650 A1 WO2018123650 A1 WO 2018123650A1 JP 2017045085 W JP2017045085 W JP 2017045085W WO 2018123650 A1 WO2018123650 A1 WO 2018123650A1
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WO
WIPO (PCT)
Prior art keywords
wavelength
optical
difference
wavelengths
signal
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Ceased
Application number
PCT/JP2017/045085
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English (en)
Japanese (ja)
Inventor
船田　知之
川瀬　大輔
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Publication of WO2018123650A1 publication Critical patent/WO2018123650A1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/015—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
    • G02F1/025—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction in an optical waveguide structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/0687—Stabilising the frequency of the laser
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
    • H04B10/2563—Four-wave mixing [FWM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control

Definitions

  • a control unit acquires information on a plurality of wavelengths from an optical transmitter for transmitting a wavelength multiplexed signal in which a plurality of wavelengths are multiplexed.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to an embodiment.
  • FIG. 2 is a block diagram showing an outline of a configuration related to optical wavelength division multiplexing communication in an embodiment.
  • FIG. 3 is a diagram showing a schematic configuration of an optical transceiver applicable to this embodiment.
  • FIG. 4 is a block diagram schematically showing the configuration of the optical transmission module 50 shown in FIG.
  • FIG. 5 is a schematic diagram for explaining a thermal connection between the laser diode, the submount, and the thermoelectric cooler shown in FIG.
  • FIG. 6 is a diagram showing an example of the relationship between the drive current and the center wavelength of the laser beam for the laser diode (DFB-LD) applicable to this embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to an embodiment.
  • FIG. 2 is a block diagram showing an outline of a configuration related to optical wavelength division multiplexing communication in an embodiment.
  • FIG. 3 is a diagram showing a schematic configuration of
  • the wavelengths of the optical signals emitted from the three light emitting units are the shortest first wavelength, the second wavelength longer than the first wavelength, and the third wavelength longer than the second wavelength.
  • the control unit calculates a first difference between the third wavelength and the second wavelength, and a second difference between the second wavelength and the first wavelength, thereby calculating the first difference. The condition is satisfied when the difference between the second difference and the second difference is smaller than the reception band of the receiver that selects the one-wavelength signal from the wavelength multiplexed signal and converts the one-wavelength signal into an electric signal. Judge that.
  • FIG. 1 is a diagram illustrating a configuration example of an optical communication system according to an embodiment.
  • a PON system 300 is an optical communication system according to an embodiment.
  • the PON system 300 includes a station side device 301, a home side device 302, a PON line 303, and an optical splitter 304.
  • the “station side device” and “home side device” may be read as “OLT (Optical Line Terminal)” and “ONU (Optical Network Unit)”, respectively.
  • OLT Optical Line Terminal
  • ONU Optical Network Unit
  • the station-side device 301 is installed in a telecommunications carrier's office building.
  • the station side device 301 mounts a host substrate (not shown).
  • an optical transceiver (not shown) that converts electrical signals and optical signals into each other.
  • the electrical interface 43 inputs and outputs electrical signals.
  • the optical transmission module 50 outputs data from the clock data recovery IC 44 in the form of an optical signal.
  • the electrical interface 43 is an interface for outputting wavelength information from the inside of the optical transmitter to the outside of the optical transmitter.
  • the electrical interface 43 is also an interface for receiving a control signal from the outside of the optical transmitter.
  • the optical transmission module 50 is configured to change at least one operating point of the plurality of light emitting units (see FIG. 4) according to the control signal.
  • FIG. 4 is a block diagram schematically showing the configuration of the optical transmission module 50 shown in FIG.
  • the optical transmission module 50 includes a temperature monitor 10, laser diodes 11, 12, 13, 14, submounts 21, 22, 23, 24, a driver 30, and an optical wavelength multiplexer ( Optical MUX) 42 and a thermoelectric cooler 48.
  • the optical transmission module 50 may be a TOSA (Transmitter Optical SubAssembly) type optical transmission module.
  • the optical output power when the operating point is changed by changing the drive current, the optical output power also changes. For this reason, the optical output power may vary.
  • the optical output is obtained by changing the drive current of the DFB-LD section. Even if the power increases, the light absorption amount of the EA modulator can be increased by changing the bias level of the EA modulator. Thereby, in the EA modulator, the optical output power can be corrected in the direction of reducing the optical output power. Note that the change in the bias level of the EA modulator does not contribute to the change in wavelength, but the optical waveform can change somewhat. Therefore, it is preferable to change the duty ratio of the modulation signal output of the driver 30.
  • FIG. 9 is a block diagram showing a configuration example of a controller included in the optical transceiver.
  • the controller 41 can include a storage unit 65.
  • the storage unit 65 may be provided inside the optical transceiver separately from the controller 41.
  • FIG. 10 is a diagram showing an example of wavelength information.
  • each of the wavelength information 71 to 74 includes transmission wavelength information ( ⁇ d1, ⁇ d2, ⁇ d3, ⁇ d4) and information indicating whether the wavelength control function is valid or invalid (for example, flag ), And a wavelength adjustment register.
  • the wavelength adjustment register receives any value from + A to -A (A is a positive integer) and holds the value.
  • the adjustment range of the transmission wavelength is determined by the value written in the wavelength adjustment register. For example, the transmission wavelength changes by 0.05 nm every time the register value is changed by one step.
  • the value of the wavelength adjustment register is linked to the change in the temperature of the laser diode or the change in the drive current of the laser diode.
  • the controller 41 can adjust the transmission wavelength specified by the wavelength information.
  • the controller 41 determines the operating point of the corresponding laser diode among the laser diodes 11 to 14 based on the value written in the wavelength adjustment register.
  • the controller 41 controls the drive current of the laser diode according to the operating point.
  • the driver 30 controls the drive current of the laser diode.
  • the controller 41 may further control the temperature of the thermoelectric cooler 48.
  • the storage unit 65 only needs to store information on the wavelength to be changed among the wavelengths ⁇ d1, ⁇ d2, ⁇ d3, and ⁇ d4. Accordingly, the storage unit 65 stores at least one wavelength information.
  • the phase matching condition between the wavelengths is satisfied. It occurs strongly. It is known that when the frequency of the input light is (fi, fj, fk), the frequency of the generated light is (fi + fj ⁇ fk). It is considered that the zero dispersion wavelength of the single mode fiber is distributed around 1312 nm near the center of the standard 1300 nm to 1324 nm.
  • FIG. 11 is a flowchart illustrating a transmission wavelength adjustment method that can be performed when the influence of four-wave mixing is not considered.
  • step S01 the value of the laser diode drive current Ild is set to the initial value, and the value of the laser diode temperature Tld is set to the initial value.
  • step S05 the center wavelength of the laser light emitted from each laser diode is measured again.
  • step S06 the drive current Ild is corrected according to the wavelength shift of each channel.
  • the optical transmitter described below transmits an optical signal having three or more wavelengths ( ⁇ 2, ⁇ 3, ⁇ 4).
  • the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4 For the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4, the relationship of ⁇ 2 ⁇ 3 ⁇ 4 is established, and the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4 are arranged at equal intervals.
  • the zero dispersion wavelength of the optical fiber exists at a wavelength greater than ( ⁇ 2 + ⁇ 3) / 2, and one of the wavelengths ⁇ 3 and ⁇ 4 may match the zero dispersion wavelength of the optical fiber (for example, 1303 to 1322 nm).
  • the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4 correspond to the “first wavelength”, the “second wavelength”, and the “third wavelength”, respectively.
  • steps S11 to S13 are executed.
  • the processes of steps S11 to S13 may be performed simultaneously or sequentially.
  • step S11 the wavelength ⁇ 4 is adjusted.
  • step S12 the wavelength ⁇ 3 is adjusted.
  • step S13 the wavelength ⁇ 2 is adjusted.
  • the adjustment results of the wavelengths ⁇ 2 to ⁇ 4 are stored in the controller 41 (storage unit 65).
  • the wavelengths ⁇ 4, ⁇ 3, and ⁇ 2 are adjusted according to the first adjustment width.
  • the first adjustment width is represented as “adjustment width 1”.
  • the wavelengths ⁇ 4, ⁇ 3, and ⁇ 2 are adjusted to the transmission wavelengths (1009.14 nm, 1304.58 nm, and 1300.05 nm, respectively) at 100 GbE.
  • step S14 the wavelength ⁇ FWM of the light generated by the four-wave mixing is calculated. Specifically, the wavelength ⁇ FWM is calculated from the wavelengths ⁇ 4, ⁇ 3, and ⁇ 2 as follows.
  • step S15 the process proceeds to step S16.
  • step S15 when the difference between ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2) is 0.3 nm or more, it is determined that there is no influence due to the four-wave mixing. In this case (NO in step S15), the wavelength adjustment process ends.
  • the transmission wavelength is adjusted so that crosstalk noise due to four-wave mixing does not enter the reception band B. Due to the characteristics of an optical fiber that transmits a wavelength division multiplexed signal, noise due to four-wave mixing may occur, but as shown in FIG. For example, when shifted by 0.3 nm, the noise can be cut by the reception low-pass filter.
  • the wavelengths ⁇ 4, ⁇ 3, and ⁇ 2 are shifted by 0.1 nm in appropriate directions. This allows the wavelength that can be generated by four-wave mixing to be separated from the signal wavelength by 0.4 nm.
  • 0.4 nm is equivalent to 70 GHz, and thus is sufficiently larger than the NRZ signal band of 25.8 Gbps. Therefore, even if noise due to four-wave mixing occurs, the noise can be treated as power crosstalk noise that can be removed by the low-pass filter of the receiver. As a result, it is possible to greatly reduce reception characteristic deterioration on the receiver side.
  • FIG. 16 is a schematic diagram for explaining the wavelength adjustment processing shown in FIG.
  • adjustment widths d1 and d2 represent a first adjustment width and a second adjustment width, respectively.
  • at least one of the two wavelengths is adjusted so that the wavelength interval becomes narrower for two wavelengths that have a narrow wavelength interval.
  • at least one of the two wavelengths is adjusted so that the wavelength interval becomes wider for two wavelengths that have a wide wavelength interval. Since the difference between ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2) can be increased to ⁇ 0.3 nm or more, the influence of four-wave mixing distortion can be suppressed.
  • Such adjustment is possible by adjusting only the wavelength ⁇ 3, adjusting two of the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4, or adjusting all of the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4.
  • the embodiment of the present invention it is possible to realize an optical transmitter configured so as not to cause four-wave mixing distortion. Furthermore, in the embodiment of the present invention, it is possible to realize an optical transceiver including an optical transmitter and an optical transmission system that can reduce the possibility of four-wave mixing distortion. Furthermore, in the embodiment of the present invention, the wavelength of the wavelength multiplexed signal can be adjusted by controlling the optical transmitter so that the optical wave mixing distortion does not occur.
  • a laser diode chip is designed and manufactured to emit light of a desired wavelength.
  • the emission wavelength of the completed laser diode chip is not always as designed, and the emission wavelength may vary within a relatively wide range of specifications.
  • the temperature from each laser diode can be controlled by the thermoelectric cooler 48 and the thermal resistance (corresponding submount of the submounts 21 to 24).
  • the wavelength can be adjusted after the assembly of the optical transmitter so that the influence of the four-wave mixing distortion does not occur.
  • the optical transmitter can store the adjusted wavelength information.
  • information on the wavelength of the optical signal can be acquired from the optical transmitter through the interface. If the optical transmitter does not have wavelength information, it is necessary to actually output light from the optical transmitter and measure the wavelength in order to obtain wavelength information. According to the embodiment of the present invention, it is possible to acquire information about the wavelength of an optical signal while making it unnecessary to actually output light from an optical transmitter.
  • FIG. 17 is a schematic view showing one configuration example of the host substrate according to this embodiment.
  • the optical transceivers 112 and 111 a are mounted on the host substrate 1.
  • the optical transceiver 111a is a three-wavelength optical transceiver, and outputs optical signals having wavelengths ⁇ 2, ⁇ 3, and ⁇ 4.
  • the optical transceiver 112 outputs an optical signal having a wavelength ⁇ 1.
  • the optical wavelength multiplexer receives an optical signal from each of the optical transceivers 112 and 111a and generates a wavelength multiplexed optical signal.
  • the three wavelengths of the optical transceiver 111a may be any three of the wavelengths ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4.
  • the optical transceiver monitoring control block 20 reads information indicating the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4 from the controller 41 of the optical transceiver 111a through the management interface.
  • the optical transceiver monitoring control block 20 may read information indicating the wavelength ⁇ 1 from the controller 51 of the optical transceiver 112 through the management interface.
  • wavelength information is sent from the optical transceiver to the optical transceiver monitoring control block 20. Since the configuration of controllers 41 and 51 is the same as the configuration shown in FIG. 9, the following description will not be repeated.
  • the optical transceiver monitoring control block 20 calculates ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2) according to the flowchart shown in FIG.
  • the optical transceiver monitoring control block 20 determines the presence or absence of the influence of the four-wave mixing distortion based on the difference between ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2).
  • the optical transceiver monitoring control block 20 sends a control signal to the controller 51 of the optical transceiver 112 to adjust the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4.
  • FIG. 18 is a schematic view showing another configuration example of the host substrate according to this embodiment.
  • the optical transceivers 113 a and 113 b are mounted on the host substrate 1.
  • Each of the optical transceivers 113a and 113b is a two-wavelength optical transceiver.
  • the optical transceiver 113a outputs optical signals having wavelengths ⁇ 1 and ⁇ 2.
  • the optical transceiver 113b outputs an optical signal having wavelengths ⁇ 3 and ⁇ 4.
  • the combination of the two wavelengths of the optical transceivers 113a and 113b is not limited.
  • the optical transceiver monitoring control block 20 reads information indicating the wavelengths ⁇ 1 and ⁇ 2 from the controller 41a of the optical transceiver 113a through the management interface. Similarly, the optical transceiver monitoring control block 20 reads information indicating the wavelengths ⁇ 3 and ⁇ 4 from the controller 41b of the optical transceiver 113b through the management interface. The optical transceiver supervisory control block 20 calculates ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2) according to the flowchart shown in FIG. The optical transceiver monitoring control block 20 determines the presence or absence of the influence of the four-wave mixing distortion based on the difference between ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2).
  • the optical transceiver monitoring control block 20 sends a control signal to the controllers 41a and 41b to adjust the wavelengths ⁇ 2, ⁇ 3, and ⁇ 4. Since the configuration of controllers 41a and 41b is the same as the configuration shown in FIG. 9, the following description will not be repeated.
  • the optical transceiver monitoring control block 20 reads information indicating the wavelength ⁇ 1 from the controller 51a of the optical transceiver 114a through the management interface. Similarly, the optical transceiver monitoring control block 20 transmits information indicating the wavelength ⁇ 2 and information indicating the wavelength ⁇ 3 from the controller 51b of the optical transceiver 111b, the controller 51c of the optical transceiver 111c, and the controller 51d of the optical transceiver 111d, respectively, through the management interface. Information indicating the wavelength ⁇ 4 is read. The optical transceiver supervisory control block 20 calculates ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2) according to the flowchart shown in FIG.
  • the optical transceiver monitoring control block 20 determines whether or not there is an influence of four-wave mixing based on the difference between ( ⁇ 4- ⁇ 3) and ( ⁇ 3- ⁇ 2). When there is an influence of four-wave mixing, the optical transceiver monitoring control block 20 sends a control signal to the controllers 51b, 51c, 51d to adjust the wavelengths ⁇ 2, ⁇ 3, ⁇ 4. Since the configurations of controllers 51a, 51b, 51c, and 51d are the same as those shown in FIG. 9, the following description will not be repeated.
  • 1 host board 10 temperature monitor, 11, 12, 13, 14 laser diode, 20 optical transceiver monitoring control block, 21, 22, 23, 24 submount, 30 drivers, 41, 41a, 41b, 51, 51a, 51b, 51c, 51d controller, 42 optical wavelength multiplexer, 43 electrical interface, 44 clock data recovery IC, 45 power supply IC, 46 temperature control IC, 48 thermoelectric cooler, 50 optical transmission module, 60 optical reception module, 61, 65 storage unit, 70 lane information, 71-74 wavelength information, 111, 111a, 111b, 111c, 111d, 112, 113a, 113b, 114a, 114b, 114c, 114d optical transceiver, 200 management device, 300 PON system, 301 station side Location, 302 optical network unit, 303 PON line, 304 an optical splitter, 305 trunk optical fiber, 306 branch optical fibers, S01 ⁇ S08, S1 ⁇ S16 step.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un procédé de réglage de longueur d'onde d'un signal multiplexé en longueur d'onde qui comprend : une étape dans laquelle une unité de commande acquiert des informations relatives à de multiples longueurs d'onde provenant d'un émetteur optique qui transmet un signal multiplexé en longueur d'onde obtenu par multiplexage de multiples longueurs d'onde, et détermine si les multiples longueurs d'onde satisfont ou non une condition pour produire un mélange à quatre ondes ; et une étape dans laquelle, si les multiples longueurs d'onde sont déterminées pour satisfaire la condition, l'unité de commande règle au moins une des multiples longueurs d'onde par commande de l'émetteur optique.
PCT/JP2017/045085 2016-12-28 2017-12-15 Procédé de réglage de longueur d'onde d'un signal multiplexé en longueur d'onde, et système de transmission optique Ceased WO2018123650A1 (fr)

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JP2016256478 2016-12-28
JP2016-256478 2016-12-28

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000151510A (ja) * 1998-11-06 2000-05-30 Furukawa Electric Co Ltd:The 波長多重光送信器およびその波長多重光送信器を用いた波長多重光伝送システム
JP2003234701A (ja) * 2002-02-12 2003-08-22 Hitachi Ltd 四光波混合による伝送品質劣化を低減可能な光伝送装置および光伝送システム
JP2008245162A (ja) * 2007-03-28 2008-10-09 Nec Corp 波長多重光伝送システム並びに波長多重光伝送方法
US20090208223A1 (en) * 2008-02-20 2009-08-20 Harmonic Inc. Four wave mixing suppression
JP2012023607A (ja) * 2010-07-15 2012-02-02 Nec Corp 波長多重光伝送システムおよび波長間隔設定方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000151510A (ja) * 1998-11-06 2000-05-30 Furukawa Electric Co Ltd:The 波長多重光送信器およびその波長多重光送信器を用いた波長多重光伝送システム
JP2003234701A (ja) * 2002-02-12 2003-08-22 Hitachi Ltd 四光波混合による伝送品質劣化を低減可能な光伝送装置および光伝送システム
JP2008245162A (ja) * 2007-03-28 2008-10-09 Nec Corp 波長多重光伝送システム並びに波長多重光伝送方法
US20090208223A1 (en) * 2008-02-20 2009-08-20 Harmonic Inc. Four wave mixing suppression
JP2012023607A (ja) * 2010-07-15 2012-02-02 Nec Corp 波長多重光伝送システムおよび波長間隔設定方法

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