CN109067498B - Method and system for real-time adjustment of wavelength in wavelength division system - Google Patents

Abstract

The invention discloses a method for real-time adjustment of wavelength in a wavelength division system, comprising the steps of: regularly sending an error code request to an optical line unit OLT; receiving a current code error rate sent by the optical line unit OLT after receiving the request determine whether the current bit error rate performance has deteriorated according to the bit error rate value; if the performance deteriorates, adjust the temperature control element according to the regulation rules according to the change of the optical power value measured by the photodetector PD, and adjust the temperature control element by adjusting the temperature control element. to adjust the working wavelength of the laser until the working wavelength of the laser works at the wavelength of the optimal bit error rate, and save the optimal bit error rate value. The invention realizes the real-time adjustment of the laser wavelength, prolongs the service life of the optical module, and ensures the performance and stable operation of the system.

Description

Method and system for real-time adjustment of wavelength in wavelength division system

technical field

The invention relates to the field of communications, in particular to a method and system for real-time adjustment of wavelengths in a wavelength division system.

Background technique

With the continuous growth of users' demand for bandwidth, the traditional copper wire broadband access system is increasingly facing bandwidth bottlenecks; at the same time, the optical fiber communication technology with huge bandwidth capacity is becoming more and more mature, the application cost is decreasing year by year, and the optical fiber access network has become the next A strong competitor of a generation of broadband access networks, especially passive optical networks (PON) are more competitive.

At present, among many optical fiber access network solutions, WDM-PON (Wavelength Division Multiplexing Passive Optical Network) has attracted much attention due to its advantages such as larger bandwidth capacity and information security similar to point-to-point communication. However, compared with optical fiber access networks such as 10GEPON and 10G GPON, the cost of WDM-PON is very high, which is the biggest obstacle to its practical commercial use. However, the current development of 5G applications has made WDM-PON a candidate solution once again flashed to the operator's field of vision. Among them, the light source is the factor that has the greatest impact on cost in WDM-PON.

In the WDM-PON system, the most important thing is to find a low-cost colorless laser solution. FIG. 1 is a system structure diagram of a typical WDM-PON. As shown in Figure 1, WDM-PON uses AWG (Array Waveguide Grating, Array Waveguide Grating) or WGR (Waveguide Grating Router, Waveguide Grating Router) at the remote node. Therefore, the AWG connected to each ONU transceiver module The wavelengths on the ports are all different. Therefore, the lasers of each ONU transceiver module are different (because different ONU transceiver modules require different wavelengths of lasers), which is called colored light in the field of optical communication. module. The use of colored optical modules in ONUs will lead to a series of colored problems. For example, the ONUs in each user's home are different and cannot be used universally; it will also bring great difficulties to operators' service provisioning. When operators distribute ONUs to users, It is also necessary to know which port (or which wavelength) of the AWG is connected to the optical fiber of the user's home; at the same time, it will also bring storage problems to the operator.

In order to achieve flexible allocation of wavelengths on the ONU side and avoid producing one ONU for each wavelength, a tunable laser can be used in the ONU. The WDM-PON system using the tunable laser in the ONU is shown in Figure 2, and only the upstream direction is shown in the figure. Tunable lasers also operate at specific wavelengths, but the wavelength can be tuned by auxiliary means so that the same laser can be used in a system to produce different operating wavelengths. Therefore, in this solution, all ONUs are the same, and there is no more storage problem. When in use, each ONU is tuned and configured according to the pre-wavelength plan, so that it emits light of a specific wavelength. In the downstream direction, if the tunable laser is also used as the light source on the OLT side, in the case of low load and low burst, multiple ONUs can share a tunable laser at the OLT and perform services through wavelength rotation, which can also save resources at the OLT. . But tunable lasers are more complex and more expensive than those used in traditional PON systems.

As one of the current mainstream solutions, the DBR tunable laser is relatively cheap, but its wavelength adjustment requires two-dimensional adjustment of the Bragg reflection region (DBR) and phase region at the same time, and wavelength calibration and parameter mapping table establishment are required before leaving the factory. , so the cost is higher. Through a special structure, Huawei Technologies Co., Ltd. realizes the self-adaptive setting of DBR chip parameters, realizes online wavelength automatic adjustment, and greatly reduces the cost of DBR tunable lasers. However, the chip itself will age with time, resulting in The chip performance deteriorates and the system has bit errors. Therefore, it is necessary to realize the function of real-time adjustment of the wavelength of the working DBR chip. Correspondingly, other tunable lasers also need to have the function of real-time adjustment of the wavelength. Wavelength is adjusted in real time.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a method and system for real-time adjustment of wavelength of a wavelength division system, which can realize real-time adjustment of laser wavelength, prolong the service life of the optical module, and ensure the performance and stable operation of the system.

The present invention provides a method for real-time adjustment of wavelength of a wavelength division system, comprising the following steps:

Send an error code request to the optical line unit OLT regularly;

Receive the current bit error rate value sent by the optical line unit OLT after receiving the request;

Determine whether the current bit error rate performance has deteriorated according to the bit error rate value;

If the performance deteriorates, adjust the temperature control element according to the regulation rules according to the change of the optical power value measured by the photodetector PD, and adjust the working wavelength of the laser by adjusting the temperature control element until the working wavelength of the laser works at the optimal bit error rate wavelength. Save the optimal bit error rate value.

Further, if the performance is deteriorated, the temperature control element is adjusted according to the regulation rules according to the change of the optical power value measured by the photodetector PD, and the laser operating wavelength is adjusted by adjusting the temperature control element until the laser operating wavelength works at the optimum. Bit error rate wavelength, in the step of saving the optimal bit error rate value, the regulation rules specifically include:

Compare the optical power value measured by the photodetector PD with the optical power value measured by the photodetector PD when the laser wavelength works at the optimal wavelength of the bit error rate;

If the optical power value becomes smaller, adjust the direction of the temperature control element to cool down, so that the working wavelength of the laser shifts to the short-wave direction;

If the optical power value increases, the direction of adjusting the temperature control element is to increase the temperature, so that the working wavelength of the laser shifts to the long wavelength direction.

Further, before the step of receiving the current bit error rate value issued by the optical line unit OLT after receiving the request, it also includes:

Determine whether the bit error rate value is greater than the saved optimal bit error rate value;

If so, judge that the current performance deteriorates;

If not, it is judged that the current performance has not deteriorated.

Further, before the step of regularly sending a code error request to the optical line unit OLT, the method further includes:

After the laser working wavelength is initialized, adjust the temperature control element to heat the laser;

Determine whether the current bit error rate is optimal;

If so, save the current optimal bit error rate value.

Further, if the performance is deteriorated, the temperature control element is adjusted according to the regulation rules according to the change of the optical power value measured by the photodetector PD, and the laser operating wavelength is adjusted by adjusting the temperature control element until the laser operating wavelength works at the optimum. The bit error rate wavelength, after the step of saving the optimal bit error rate value, also includes:

Read the value of the temperature control element and set it as the working temperature value of the laser.

The present invention also proposes a system for real-time adjustment of wavelength of a wavelength division system, including:

The request module is used to periodically send the error code request to the optical line unit OLT;

The query module is used to receive the current bit error rate value sent by the optical line unit OLT after receiving the request;

a first judgment module, configured to judge whether the current BER performance has deteriorated according to the BER value;

The first control module is used to adjust the temperature control element according to the change of the optical power value measured by the photodetector PD in accordance with the control rules if the performance deteriorates, and adjust the laser operating wavelength by adjusting the temperature control element until the laser operating wavelength is in Optimal bit error rate wavelength, save the optimal bit error rate value.

Further, the first adjustment module in the system for real-time wavelength adjustment of the wavelength division system includes:

The comparison sub-module is used to compare the optical power value measured by the optical detector PD with the optical power value measured by the optical detector PD when the laser wavelength works at the optimal wavelength of the bit error rate;

The first execution sub-module is used to adjust the direction of the temperature control element to cool down if the optical power value becomes smaller, so that the working wavelength of the laser shifts to the short-wave direction;

The second execution sub-module is used to adjust the direction of the temperature control element to increase the temperature if the optical power value becomes larger, so that the working wavelength of the laser is shifted to the long wavelength direction.

Further, the system for real-time adjustment of the wavelength of the wavelength division system also includes:

The second judgment module is used for judging whether the bit error rate value is greater than the stored optimal bit error rate value;

The third execution module is used to judge that the current performance is deteriorated if the second judgment module is yes;

The fourth execution module is used for determining that the current performance has not deteriorated if the second judgment module is no.

Further, the system for real-time adjustment of the wavelength of the wavelength division system also includes:

The second adjustment module is used to adjust the temperature control element to heat the laser after the working wavelength of the laser is initialized;

The third judgment module is used to judge whether the current bit error rate is optimal;

The fifth execution module is used for saving the current optimal bit error rate value if the third judgment module is yes.

Further, the system for real-time adjustment of the wavelength of the wavelength division system also includes:

The setting module is used to read the value of the temperature control element and set it as the working temperature value of the laser.

The method and system for real-time adjustment of wavelength of the wavelength division system of the present invention have the following beneficial effects: through the protocol interaction between the optical network unit ONU and the optical line unit OLT, the current working state of the entire system is obtained, and after the system performance is degraded, the optical detector can be detected by detecting The optical power value detected by the PD, adjust the working temperature of the temperature control element, and adjust the working wavelength of the laser by adjusting the working temperature of the temperature control element, so that the system always works in the optimal bit error rate state, thereby realizing the real-time laser wavelength. The adjustment prolongs the service life of the optical module and ensures the performance and stable operation of the system.

Description of drawings

1 is a typical WDM-PON structure in the background of the present invention;

Fig. 2 is the WDM-PON system of tunable laser in the background technology of the present invention;

3 is a schematic diagram of steps of an embodiment of a method for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

4 is a schematic diagram of steps of another embodiment of the method for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

5 is a schematic diagram of steps of a third embodiment of a method for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

6 is a schematic diagram of steps in a fourth embodiment of the method for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

7 is a schematic structural diagram of an embodiment of a system for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

8 is a schematic structural diagram of another embodiment of a system for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

9 is a schematic structural diagram of a third embodiment of a system for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

10 is a schematic structural diagram of a first control module in the system for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

11 is a schematic structural diagram of a fourth embodiment of a system for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

12 is a schematic structural diagram of an architecture for real-time adjustment of wavelengths in a wavelength division system according to the present invention;

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, movement situation, etc., if the specific posture changes, the directional indication also changes accordingly, and the connection may be a direct connection or an indirect connection.

In addition, descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

Referring to Fig. 3, a method for real-time adjustment of wavelength of a wavelength division system, comprising the following steps:

S1. Regularly send an error code request to the optical line unit OLT;

S2. Receive the current bit error rate value sent by the optical line unit OLT after receiving the request;

S3. Determine whether the current bit error rate performance is deteriorated according to the bit error rate value;

S4. If the performance deteriorates, adjust the temperature control element according to the regulation rules according to the change of the optical power value measured by the photodetector PD, and adjust the working wavelength of the laser by adjusting the temperature control element until the working wavelength of the laser works at the optimal bit error rate wavelength, and save the optimal bit error rate value.

In the above step S1, the optical network unit ONU may send a bit error request to the optical line unit OLT at regular intervals, the interval time may be set, and the obtained bit error rate is used to judge the working state of the system.

4, further, before step S1, it also includes:

S11. After the laser working wavelength is initialized, adjust the temperature control element to heat the laser;

S12, determine whether the current bit error rate is optimal;

S13: If yes, save the current optimal bit error rate value.

In the above step S11, when the laser wavelength is initialized, it is determined by judging the reflected optical power. When the emission wavelength of the laser and the center wavelength of the arrayed waveguide grating AWG are completely aligned, that is, when the reflected optical power is the largest, this When the initialization of the wavelength is considered to be completed, the laser is heated by adjusting the temperature control element, so that the working wavelength of the laser is shifted to the long-wave direction.

In the above step S12, the operating wavelength of the laser is shifted to the long-wave direction, and the reported bit error rate is getting better and better. , by filtering out the clutter of 0 level and improving the signal of 1 electric evaluation, the extinction ratio can be improved, and the performance of the whole system can be improved.) In the best state, the bit error rate is optimal. At this time, continue to heat the laser through the temperature control element , the bit error rate deteriorates instead, and it is judged whether the current bit error rate is optimal by observing the reported bit error rate changes.

In the above step S13, when the bit error rate is optimal, the WDM system works in the best state, and the current optimal bit error rate value is saved for the purpose of judging whether the system performance is deteriorated later.

In the above step S2, after receiving the request sent by the optical network unit ONU, the optical line unit OLT inquires about the bit error situation and sends the current bit error rate value to the optical network unit ONU, and the optical network unit ONU receives the data sent by the optical line unit OLT. The current bit error rate value, completes the protocol interaction with the optical line unit OLT.

In the above step S3, the ONU of the optical network unit compares the received bit error rate value with the pre-saved optimal bit error rate value, if the received bit error rate value is larger than the pre-saved optimal bit error rate value, Or it can also be that the received bit error rate value is greater than the pre-stored optimal bit error rate value than the set value, then it can be judged that the current bit error rate performance has deteriorated, and the value is set according to system requirements to prevent small-scale changes. It may be a measurement error. For example, the deterioration from 1E-5 to 1E-4 is considered to be a deterioration. This is determined by the user according to the stability of the system.

Referring to Fig. 5, further, before step S3, it also includes:

S31. Determine whether the bit error rate value is greater than the stored optimal bit error rate value;

S32. If yes, determine that the current performance is deteriorated;

S33. If no, determine that the current performance has not deteriorated.

In the above step S31, the optical network unit ONU compares the received bit error rate value with the pre-stored optimal bit error rate value, and determines whether the received bit error rate value is greater than the pre-saved optimal bit error rate value, and the pre-stored optimal bit error rate value is determined. The saved optimal bit error rate value is obtained when the system is in the best working state, so judging the change of the bit error rate value can determine whether the system has deteriorated.

In the above step S32, if the received bit error rate value is greater than the pre-stored optimal bit error rate value, it means that the system performance is deteriorated.

In the above step S33, if the received bit error rate value is not greater than the pre-stored optimal bit error rate value, it means that the system performance is not deteriorated.

In the above step S4, according to the change of the optical power value measured by the photodetector PD, the drift of the working wavelength of the laser can be known. Therefore, the direction of the temperature control element can be adjusted according to the regulation rules, and the working wavelength of the laser can be fine-tuned by adjusting the temperature control element. , so that the bit error rate is optimized again, because the optimal bit error rate value is changed according to the actual situation of the system, so when the bit error rate reaches the optimal value, it is necessary to save the optimal bit error rate value again, so as to determine whether there is performance. deterioration. The regulation rules in the above-mentioned step S4 include:

Compare the optical power value measured by the photodetector PD with the optical power value measured by the photodetector PD when the laser wavelength works at the optimal wavelength of the bit error rate;

If the optical power value becomes smaller, adjust the direction of the temperature control element to cool down, so that the working wavelength of the laser shifts to the short-wave direction;

If the optical power value increases, the direction of adjusting the temperature control element is to increase the temperature, so that the working wavelength of the laser shifts to the long wavelength direction.

The regulation rule is based on the change of the optical power value measured by the photodetector PD when the performance deteriorates to obtain the drift of the laser's operating wavelength. If the optical power value becomes smaller, it means that the laser's operating wavelength drifts to the long-wave direction, and the temperature control element cools down. , make the working wavelength of the laser drift to the short-wave direction. On the contrary, if the optical power value increases, it means that the working wavelength of the laser drifts to the short-wave direction, and the temperature control element increases the temperature, so that the working wavelength of the laser drifts to the long-wave direction. Adjust the laser wavelength in real time. At this time, it can be considered that the working wavelength of the arrayed waveguide grating AWG is unchanged, and the working wavelength of the arrayed waveguide grating AWG and the working wavelength of the laser are relative and reversed. The working wavelength of the grating AWG shifts to the long-wave direction, while the laser’s working wavelength remains unchanged, which means that the working wavelength of the arrayed waveguide grating AWG remains unchanged, and the laser’s working wavelength shifts to the short-wave direction. The value of the laser can be adjusted in real time to ensure the performance and stable operation of the system.

6, further, after step S4, it also includes:

S41, read the value of the temperature control element and set it as the working temperature value of the laser.

In the above step S4a, the operating wavelength of the laser has been adjusted to the optimal wavelength of the bit error rate. After obtaining the value of the temperature control element through the software, the value is set as the operating temperature of the laser, and the operating wavelength of the laser is always at the optimal operating wavelength to stabilize the system. Work.

7 , a system for real-time adjustment of wavelengths in a wavelength division system includes:

The request module 1 is used to periodically send a code error request to the optical line unit OLT;

The query module 2 is used to receive the current bit error rate value sent by the optical line unit OLT after receiving the request;

The first judgment module 3 is used for judging whether the current BER performance has deteriorated according to the BER value;

The first regulation module 4 is used to adjust the temperature control element according to the change of the optical power value measured by the photodetector PD according to the regulation rules if the performance deteriorates, and adjust the laser working wavelength by adjusting the temperature control element until the laser working wavelength works. At the optimal BER wavelength, the optimal BER value is stored.

In the above-mentioned request module 1, the ONU of the optical network unit can send a bit error request to the optical line unit OLT at regular intervals, the interval time can be set, and the obtained bit error rate is used to judge the working state of the system.

Referring to Fig. 8, further, the system for real-time adjustment of wavelength of the wavelength division system also includes:

The second adjustment module 11 is used to adjust the temperature control element to heat the laser after the working wavelength of the laser is initialized;

The third judgment module 12 is used to judge whether the current bit error rate is optimal;

The fifth execution module 13 is used for saving the current optimal bit error rate value if the third judgment module is yes.

In the second adjustment module 11, the wavelength of the laser is determined by judging the reflected optical power during initialization. When the emission wavelength of the laser and the center wavelength of the arrayed waveguide grating (AWG) are completely aligned, that is, when the reflected optical power is the maximum At this time, it is considered that the initialization of the wavelength is completed, and the laser is heated by adjusting the temperature control element, so that the working wavelength of the laser is shifted to the long wavelength direction.

In the third judgment module 12, the working wavelength of the laser shifts to the long-wave direction, and the reported bit error rate is getting better and better. On the right, by filtering out the clutter of 0 level, the signal of 1 electric evaluation can be improved, so that the extinction ratio can be improved and the performance of the whole system can be improved.) In the best state, the bit error rate is optimal. At this time, continue to pass the temperature control element. When the laser is heated, the bit error rate deteriorates. By observing the reported bit error rate changes, it is judged whether the current bit error rate is optimal.

In the above fifth execution module 13, when the bit error rate is optimal, the WDM system works in the best state, and the current optimal bit error rate value is saved for the purpose of judging whether the system performance is deteriorated later.

In the above query module 2, after the optical line unit OLT receives the request sent by the optical network unit ONU, it queries the bit error situation and sends the current bit error rate value to the optical network unit ONU, and the optical network unit ONU receives the Send the current bit error rate value to complete the protocol interaction with the optical line unit OLT.

In the above-mentioned first judgment module 3, the optical network unit ONU compares the received bit error rate value with the pre-stored optimal bit error rate value, if the received bit error rate value is higher than the pre-saved optimal bit error rate value If the received bit error rate value is larger than the pre-saved optimal bit error rate value, it can be judged that the current bit error rate performance has deteriorated. The value is set according to the system requirements to prevent small The change may be a measurement error. For example, the magnitude of deterioration from 1E-5 to 1E-4 is considered to be deterioration. This is determined by the user according to the stability of the system.

Referring to Fig. 9, further, the system for real-time adjustment of wavelength of the wavelength division system also includes:

The second judgment module 31 is used for judging whether the bit error rate value is greater than the stored optimal bit error rate value;

The third execution module 32 is used to judge that the current performance is deteriorated when the second judgment module is yes;

The fourth execution module 33 is used for determining that the current performance is not deteriorated if the second determination module is no.

In the above-mentioned second judgment module 31, the ONU compares the received bit error rate value with the pre-stored optimal bit error rate value, and determines whether the received bit error rate value is greater than the pre-stored optimal bit error rate value The pre-stored optimal bit error rate value is obtained when the system is in the best working state, so judging the change of the bit error rate value can determine whether the system has deteriorated.

In the above-mentioned third execution module 32, if the received bit error rate value is greater than the pre-stored optimal bit error rate value, it means that the system performance deteriorates.

In the above-mentioned fourth execution module 33, if the received bit error rate value is not greater than the pre-stored optimal bit error rate value, it means that the system performance is not deteriorated.

In the above-mentioned first control module 4, according to the change of the optical power value measured by the photodetector PD, the drift of the working wavelength of the laser can be known. Therefore, the direction of the temperature control element can be adjusted according to the control rules, and the fine adjustment can be made by adjusting the temperature control element. The operating wavelength of the laser makes the bit error rate optimal again, because the optimal bit error rate value is changed according to the actual situation of the system, so when the bit error rate reaches the optimum, the optimal bit error rate value should be saved again for subsequent judgment. Is there any performance degradation.

Referring to Figure 10, the above-mentioned first control module 4 includes:

The comparison sub-module 4a is used to compare the optical power value measured by the optical detector PD with the optical power value measured by the optical detector PD when the laser wavelength works at the optimal wavelength of the bit error rate;

The first execution sub-module 4b is used to adjust the direction of the temperature control element to lower the temperature if the optical power value becomes smaller, so that the working wavelength of the laser shifts to the short-wave direction;

The second execution sub-module 4c is used to adjust the direction of the temperature control element to increase the temperature if the optical power value becomes larger, so that the operating wavelength of the laser is shifted to the long wavelength direction.

The above module is based on the change of the optical power value measured by the photodetector PD when the performance deteriorates to obtain the drift of the working wavelength of the laser. If the optical power value becomes smaller, it means that the working wavelength of the laser drifts to the long wave direction, and the temperature control element cools down. , make the working wavelength of the laser drift to the short-wave direction. On the contrary, if the optical power value increases, it means that the working wavelength of the laser drifts to the short-wave direction, and the temperature control element increases the temperature, so that the working wavelength of the laser drifts to the long-wave direction. Adjust the laser wavelength in real time. At this time, it can be considered that the working wavelength of the arrayed waveguide grating AWG is unchanged, and the working wavelength of the arrayed waveguide grating AWG and the working wavelength of the laser are relative and reversed. The working wavelength of the grating AWG shifts to the long-wave direction, while the laser’s working wavelength remains unchanged, which means that the working wavelength of the arrayed waveguide grating AWG remains unchanged, and the laser’s working wavelength shifts to the short-wave direction. The value of the laser can be adjusted in real time to ensure the performance and stable operation of the system.

Referring to Fig. 11, further, the system for real-time adjustment of wavelength of the wavelength division system also includes:

The setting module 41 is used to read the value of the temperature control element and set it as the working temperature value of the laser.

In the above setting module 41, the operating wavelength of the laser has been adjusted to the optimal wavelength of the bit error rate. After obtaining the value of the temperature control element through the software, the value is set as the operating temperature of the laser, and the operating wavelength of the laser is always at the optimal operating wavelength, so that the system Stable work.

Referring to FIG. 12 , a structure for real-time adjustment of wavelengths in a wavelength division system includes an optical network unit ONU5, an arrayed waveguide grating AWG6 and an optical line unit OLT7, and the optical network unit ONU5 is used to receive the data signal sent by the optical line unit OLT7 to the user, and the arrayed waveguide The grating AWG6 is used for laser wavelength initialization, real-time adjustment and multi-wavelength functions. The optical line unit OLT7 is used to receive user requests and send data to users. It also includes a reflector FRM8 and an optical module 9. The reflector FRM8 is set in the optical line unit OLT7. It is used to change the polarization direction of the light and transmit part of the light back to the optical module 9 with the arrayed waveguide grating AWG6. The optical module 9 is arranged on the optical network unit ONU5. The optical module 9 includes a transmitting unit 91, a receiving unit 92 and a wavelength division multiplexing. The transmitter MUX93, the transmitting unit 91 is used to send the data request of the optical network unit ONU5 to the optical line unit OLT7 and the light reflected by the receiving mirror FRM8, and the receiving unit 92 is used to receive the optical signal sent by the optical line unit OLT7. The device MUX93 is arranged at the intersection of the optical paths of the transmitting unit 91 and the receiving unit 92 for combining and dividing the light waves of the transmitting unit 91 and the receiving unit 92. The transmitting unit 91 includes a partial reflection mirror 911, a photodetector PD912 and a laser 913, and the partial reflection mirror 911 The light reflected by the reflection mirror FRM8 is reflected to the lower photodetector PD912, and a laser 913 is provided on the side of the partial reflection mirror 911 away from the wavelength division multiplexer MUX93.

Through the protocol interaction between the optical line unit OLT7 and the optical network unit ONU5, the current working state of the entire system is obtained, and the reflector FRM8 (Faraday Rotating Mirror) emits part of the light back to the optical module 9. In some embodiments, the partial reflector 911 can It is a polarization beam splitter, which reflects and transmits light of different polarizations. The partial reflection mirror 911 reflects part of the light emitted by the reflection mirror FRM8 to the photodetector PD912. The power intensity of the reflected light detected by the photodetector PD912 can be obtained from the laser 913. For the drift of the wavelength, by controlling the temperature control element under the laser 913, the working wavelength of the laser 913 can be fine-tuned, so as to achieve the purpose of adjusting the laser in real time, prolong the service life of the optical module 9, and ensure the performance and stable operation of the system. After the network unit ONU5 finds that the performance of the system has deteriorated, it queries the optical power intensity reflected to the optical detector PD912. If the optical power becomes larger, the center wavelength of the laser 913 can be obtained to move to the center wavelength of the arrayed waveguide grating AWG6. By adjusting the laser 913 The temperature control element below makes the working wavelength of the laser 913 shift to the long-wave direction, so as to achieve the purpose of adjusting the wavelength of the laser in real time.

The method and system for real-time adjustment of wavelength of the wavelength division system of the present invention have the following beneficial effects: through the protocol interaction between the optical network unit ONU and the optical line unit OLT, the current working state of the entire system is obtained, and after the system performance is degraded, the optical detector can be detected by detecting The optical power value detected by the PD, adjust the working temperature of the temperature control element, and adjust the working wavelength of the laser by adjusting the working temperature of the temperature control element, so that the system always works in the optimal bit error rate state, thereby realizing the real-time laser wavelength. The adjustment prolongs the service life of the optical module and ensures the performance and stable operation of the system.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related All technical fields are similarly included in the scope of patent protection of the present invention.

Claims (8)

1. A method for real-time wavelength adjustment of a wavelength division system comprises the following steps:

pre-storing an optimal error code rate value;

sending an error code issuing request to an optical line unit OLT at regular time;

receiving a current error rate value issued after the OLT receives the request;

judging whether the current error rate performance is deteriorated or not according to the optimal error rate value;

if the performance is deteriorated, the temperature control element is adjusted according to the regulation and control rule according to the change of the optical power value measured by the optical detector PD, and the regulation and control rule specifically comprises the following steps:

comparing the optical power value measured by the optical detector PD with the optical power value measured by the optical detector PD when the wavelength of the laser works at the wavelength with the optimal error rate;

if the optical power value is reduced, the direction of the temperature control element is adjusted to be cooled, so that the working wavelength of the laser drifts towards the direction of short wave;

if the optical power value is increased, adjusting the direction of the temperature control element to be temperature increase, so that the working wavelength of the laser drifts towards the long wave direction;

and adjusting the working wavelength of the laser by adjusting the temperature control element until the working wavelength of the laser works at the wavelength of the optimal error code rate, and storing the optimal error code rate value.

2. The method according to claim 1, wherein before the step of determining whether the current error rate performance has deteriorated according to the error rate value, the method further comprises:

judging whether the error code rate value is larger than the stored optimal error code rate value;

if yes, judging that the current performance is deteriorated;

if not, judging that the current performance is not deteriorated.

3. The method according to claim 1, wherein before the step of sending error code sending request to the OLT, the method further comprises:

after the working wavelength of the laser is initialized, adjusting a temperature control element to heat the laser;

judging whether the current error rate is optimal or not;

if yes, the current optimal error rate value is saved.

4. The method according to claim 1, wherein if the performance is deteriorated, the temperature control element is adjusted according to the optical power value change measured by the optical detector PD according to the regulation rule, the laser operating wavelength is adjusted by adjusting the temperature control element until the laser operating wavelength operates at the optimum error rate wavelength, and after the step of storing the optimum error rate value, the method further comprises:

and reading the value of the temperature control element and setting the value as the working temperature value of the laser.

5. A system for real-time wavelength division multiplexing, comprising:

the request module is used for sending an error code issuing request to the OLT at regular time;

the query module is used for receiving the current error rate value issued after the OLT receives the request;

the first judgment module is used for judging whether the current error rate performance is deteriorated or not according to the pre-stored optimal error rate value;

a first adjusting module, configured to adjust the temperature control element according to a regulation rule according to a change in an optical power value measured by the optical detector PD if performance deteriorates, where the first adjusting module includes:

the comparison submodule is used for comparing the optical power value measured by the optical detector PD with the optical power value measured by the optical detector PD when the wavelength of the laser works at the wavelength with the optimal error rate;

the first execution submodule is used for adjusting the direction of the temperature control element to be temperature reduction if the optical power value is reduced, so that the working wavelength of the laser drifts towards the short wave direction;

the second execution submodule is used for adjusting the direction of the temperature control element to be temperature increase if the light power value is increased, so that the working wavelength of the laser drifts towards the long wave direction;

and adjusting the working wavelength of the laser by adjusting the temperature control element until the working wavelength of the laser works at the wavelength of the optimal error code rate, and storing the optimal error code rate value.

6. The system for real-time wavelength division multiplexing system of claim 5, further comprising:

the second judgment module is used for judging whether the error code rate value is larger than the stored optimal error code rate value;

the third execution module is used for judging the current performance deterioration if the second judgment module is yes;

and the fourth execution module is used for judging whether the current performance is not deteriorated if the second judgment module is negative.

7. The system for real-time wavelength division multiplexing system of claim 5, further comprising:

the second adjusting module is used for adjusting the temperature control element to heat the laser after the working wavelength of the laser is initialized;

the third judgment module is used for judging whether the current bit error rate is optimal or not;

and the fifth execution module is used for saving the current optimal error code rate value if the third judgment module is yes.

8. The system for real-time wavelength division multiplexing system of claim 5, further comprising:

and the setting module is used for reading the value of the temperature control element and setting the value as the working temperature value of the laser.

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