CN109067498B - Method and system for adjusting wavelength of wavelength division system in real time - Google Patents
Method and system for adjusting wavelength of wavelength division system in real time Download PDFInfo
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- CN109067498B CN109067498B CN201810778343.9A CN201810778343A CN109067498B CN 109067498 B CN109067498 B CN 109067498B CN 201810778343 A CN201810778343 A CN 201810778343A CN 109067498 B CN109067498 B CN 109067498B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07957—Monitoring or measuring wavelength
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Abstract
The invention discloses a method for adjusting the wavelength of a wavelength division system in real time, which comprises the following steps: 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 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, the working wavelength of the laser is adjusted by adjusting the temperature control element until the working wavelength of the laser works at the wavelength with the optimal error code rate, and the optimal error code rate value is stored. The invention realizes the real-time adjustment of the wavelength of the laser, prolongs the service life of the optical module and ensures the performance and stable work of the system.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and system for adjusting the wavelength of a wavelength division system in real time.
Background
With the increasing demand of users for bandwidth, the traditional copper wire broadband access system faces more and more bandwidth bottleneck; meanwhile, the optical fiber communication technology with huge bandwidth capacity is mature day by day, the application cost is reduced year by year, and the optical fiber access network becomes a powerful competitor of the next generation broadband access network, wherein the Passive Optical Network (PON) is particularly more competitive.
At present, among numerous solutions for optical access networks, WDM-PON (wavelength division multiplexing-type passive optical network) is receiving attention due to its advantages such as larger bandwidth capacity, information security similar to point-to-point communication, and the like. However, compared with optical fiber access networks such as 10G EPON and 10G GPON, the WDM-PON has high cost and is the biggest obstacle to the practical commercial use. However, the current development of 5G applications has made WDM-PON a candidate, again in view of operators, where the light source is the most cost-affecting factor in WDM-PON.
In WDM-PON systems, it is most critical to find a low-cost colorless laser solution. Fig. 1 is a system configuration diagram of a typical WDM-PON. As shown in fig. 1, the WDM-PON uses AWG (Array Waveguide Grating) or WGR (Waveguide Grating Router) at the remote node, so that the wavelength at the AWG port connected to each ONU transceiver module is different, which results in that the laser of each ONU transceiver module is different (because different ONU transceiver modules require different lasers), which is called a colored optical module in the optical communication field. The ONU using the colored light module may cause a series of colored problems, such as: the ONU of each user home is different and cannot be used universally; it also brings great difficulty to service delivery of the operator, and when the operator delivers the ONU to the user, the operator still needs to know which port (or which wavelength) of the AWG is connected to the optical fiber of the user's home; meanwhile, warehousing problems can be brought to operators.
In order to realize flexible allocation of the ONU-side wavelengths and avoid producing an ONU for each wavelength, a tunable laser may be used in the ONU. A WDM-PON system using a tunable laser in an ONU is shown in fig. 2, in which only the upstream direction is shown. Tunable lasers also operate at specific wavelengths, but the wavelengths can be tuned by secondary means so that the same laser can be used in a system to produce different operating wavelengths. Therefore, in the scheme, all the ONUs are the same, and the warehousing problem does not exist any more. When in use, each ONU is tuned and configured according to a preset wavelength plan so as to emit light with a specific wavelength. In the downlink direction, if the adjustable laser is also used as the light source on the OLT side, a plurality of ONUs can share the adjustable laser at the OLT during low load and low burst, and service is performed by wavelength rotation, so that resources at the OLT can be saved. However, tunable lasers are more complex and expensive than lasers used in conventional PON systems.
The DBR tunable laser is one of the current mainstream solutions, the chip price is low, but the wavelength tuning needs to simultaneously perform 2-dimensional tuning on the bragg reflection region (DBR) and the phase region, and when leaving the factory, the wavelength calibration and the parameter mapping table establishment need to be performed, so the cost is high. Hua is a special structure of technology limited company, has realized the adaptive setting of DBR chip parameter, has realized the online wavelength automatically regulated, reduce the cost of DBR tunable laser greatly, but the chip itself can age with the increase of time, cause the performance deterioration of the chip, the system appears the error code, so need realize the function of real-time adjustment to the wavelength of DBR chip working, correspondingly, other tunable lasers also need to have the function of real-time adjustment of wavelength, the technical scheme of the invention aims at realizing the wavelength of tunable laser and adjusting in real time.
Disclosure of Invention
The invention mainly aims to provide a method and a system for adjusting the wavelength of a wavelength division system in real time, which realize the real-time adjustment of the wavelength of a laser, prolong the service life of an optical module and ensure the performance and stable work of the system.
The invention provides a method for adjusting the wavelength of a wavelength division system in real time, which comprises the following steps:
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 according to the 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, the working wavelength of the laser is adjusted by adjusting the temperature control element until the working wavelength of the laser works at the wavelength with the optimal error code rate, and the optimal error code rate value is stored.
Further, if the performance deteriorates, the temperature control element is adjusted according to the adjustment rule according to the change of the optical power value measured by the optical detector PD, the laser operating wavelength is adjusted by adjusting the temperature control element until the laser operating wavelength operates at the optimal error rate wavelength, and the optimal error rate value is stored, where the adjustment rule specifically includes:
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, the direction of the temperature control element is adjusted to be increased in temperature, so that the working wavelength of the laser drifts towards the long wave direction.
Further, before the step of receiving the current error rate value issued after the request is received by the OLT of the optical line unit, the method further includes:
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.
Further, before the step of sending an error code sending request to the optical line unit OLT at regular time, the method further includes:
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.
Further, if the performance deteriorates, the method further includes the steps of adjusting the temperature control element according to the regulation rule according to the change of the optical power value measured by the optical detector PD, adjusting the laser operating wavelength by adjusting the temperature control element until the laser operating wavelength operates at the optimal error rate wavelength, and storing the optimal error rate value:
and reading the value of the temperature control element and setting the value as the working temperature value of the laser.
The invention also provides a system for adjusting the wavelength of the wavelength division system in real time, which comprises:
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 judging module is used for judging whether the current error rate performance is deteriorated or not according to the error rate value;
and the first regulation and control module is used for regulating the temperature control element according to the regulation and control rule according to the change of the optical power value measured by the optical detector PD if the performance is deteriorated, regulating the working wavelength of the laser by regulating the temperature control element until the working wavelength of the laser works at the optimal error rate wavelength, and storing the optimal error rate value.
Further, the first adjusting module in the system for adjusting the wavelength of the wavelength division system in real time comprises:
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;
and the second execution submodule is used for adjusting the direction of the temperature control element to be temperature-increased if the optical power value is increased, so that the working wavelength of the laser drifts towards the long wave direction.
Further, the system for adjusting the wavelength of the wavelength division system in real time further comprises:
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.
Further, the system for adjusting the wavelength of the wavelength division system in real time further comprises:
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.
Further, the system for adjusting the wavelength of the wavelength division system in real time further comprises:
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.
The method and the system for adjusting the wavelength of the wavelength division system in real time have the advantages that: the current working state of the whole system is obtained through protocol interaction of an optical network unit ONU and an optical line unit OLT, after the performance of the system is known to be deteriorated, the working temperature of a temperature control element is adjusted through detecting the optical power value detected by an optical detector PD, and the working wavelength of a laser is adjusted through adjusting the working temperature of the temperature control element, so that the system always works in the optimal error rate state, the wavelength of the laser is adjusted in real time, the service life of an optical module is prolonged, and the performance and stable work of the system are ensured.
Drawings
Fig. 1 is a typical WDM-PON structure in the background of the present invention;
FIG. 2 is a WDM-PON system with tunable lasers in the background of the present invention;
FIG. 3 is a schematic diagram illustrating the steps of a method for adjusting the wavelength of a wavelength division system in real time according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating another embodiment of a method for adjusting wavelengths of a wavelength division system in real time according to the present invention;
FIG. 5 is a diagram illustrating a third exemplary step of a method for adjusting wavelength of a wavelength division system in real time according to the present invention;
FIG. 6 is a diagram illustrating a fourth embodiment of a method for adjusting wavelengths of a wavelength division system in real time according to the present invention;
FIG. 7 is a schematic diagram of a system for real-time wavelength adjustment of a wavelength division system according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a system for real-time wavelength adjustment of a wavelength division system according to another embodiment of the present invention;
FIG. 9 is a schematic diagram of a system for real-time wavelength adjustment of a wavelength division system according to a third embodiment of the present invention;
FIG. 10 is a schematic diagram of a first control module of a system for real-time wavelength adjustment of a wavelength division system according to the present invention;
FIG. 11 is a schematic diagram of a system for real-time wavelength adjustment of a wavelength division system according to a fourth embodiment of the present invention;
FIG. 12 is a schematic diagram of an architecture for real-time wavelength adjustment of a wavelength division system according to the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 3, a method for adjusting wavelength of a wavelength division system in real time includes the following steps:
s1, sending error code sending request to OLT in fixed time;
s2, receiving the current error rate value sent down by the optical line unit OLT after receiving the request;
s3, judging whether the current error rate performance is deteriorated according to the error rate value;
and S4, if the performance is deteriorated, adjusting the temperature control element according to the light power value change measured by the light detector PD and the regulation rule, 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 rate, and storing the optimal error rate value.
In step S1, the ONU may send an error issuing request to the OLT at intervals, where the interval may be set, and the obtained error rate is used to determine the operating state of the system.
Referring to fig. 4, further, step S1 is preceded by:
s11, adjusting a temperature control element to heat the laser after the laser working wavelength is initialized;
s12, judging whether the current error rate is optimal or not;
and S13, if yes, saving the current optimal error rate value.
In step S11, the initialization of the laser wavelength is determined by determining the reflected optical power, and when the emission wavelength of the laser and the center wavelength of the AWG are completely aligned, i.e. when the reflected optical power is the maximum, the initialization of the wavelength is considered to be completed, and the temperature control element is adjusted to heat the laser, so that the operating wavelength of the laser shifts to the long wavelength direction.
In the step S12, the working wavelength of the laser drifts in the long-wave direction, and the reported error rate is better and better, and when the optimal state of the optical equalization effect is reached (the central wavelength of the laser is aligned to the right side of the central wavelength of the arrayed waveguide grating AWG, the noise wave of 0 level is filtered out, and the signal of 1 electrical evaluation is promoted, so that the extinction ratio can be improved, and the performance of the whole system is improved), the error rate is optimal, and at this time, the laser is continuously heated by the temperature control element, but the error rate is deteriorated, and whether the current error rate is optimal or not is judged by observing the reported error rate change condition.
In step S13, the optimum bit error rate is the optimum working state of the wavelength division system, and the current optimum bit error rate value is stored to determine whether the system performance is degraded or not.
In step S2, after receiving the request sent by the optical network unit ONU, the optical line unit OLT queries the error condition and issues the current error rate value to the optical network unit ONU, and the optical network unit ONU receives the current error rate value issued by the optical line unit OLT, thereby completing the protocol interaction with the optical line unit OLT.
In step S3, the ONU compares the received error rate value with the pre-stored optimal error rate value, and if the received error rate value is larger than the pre-stored optimal error rate value, or the received error rate value is larger than the pre-stored optimal error rate value, it can be determined that the current error rate performance is deteriorated, and the value is set according to the system requirements, so as to prevent the small-range change from possibly being a measurement error, for example, from 1E-5 to 1E-4, which is considered as deterioration, and this is determined by the user according to the system stability.
Referring to fig. 5, further, before step S3, the method further includes:
s31, judging whether the error code rate value is larger than the stored optimal error code rate value;
s32, if yes, judging that the current performance is deteriorated;
and S33, if not, judging that the current performance is not deteriorated.
In step S31, the ONU compares the received error rate value with the pre-stored optimal error rate value, and determines whether the received error rate value is greater than the pre-stored optimal error rate value, where the pre-stored optimal error rate value is obtained when the system is in the optimal operating state, so as to determine whether the system has a degradation due to a change in the error rate value.
In step S32, if the received error rate value is greater than the pre-stored optimal error rate value, the system performance will be degraded.
In step S33, if the received error rate value is not greater than the pre-stored optimal error rate value, it indicates that the system performance is not degraded.
In the step S4, the drift of the laser operating wavelength can be known according to the change of the optical power value measured by the optical detector PD, so that the direction of the temperature control element can be adjusted according to the regulation rule, and the laser operating wavelength is fine-tuned by adjusting the temperature control element, so that the error rate is optimal again. The regulation rule in the above step S4 includes:
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, the direction of the temperature control element is adjusted to be increased in temperature, so that the working wavelength of the laser drifts towards the long wave direction.
The regulation and control rule is that the drift condition of the working wavelength of the laser is obtained according to the change of the optical power value measured by the optical detector PD when the performance is deteriorated, if the optical power value is reduced, the working wavelength of the laser is drifted towards the long wavelength direction, the temperature control element is cooled, the working wavelength of the laser is drifted towards the short wavelength direction, otherwise, if the optical power value is increased, the working wavelength of the laser is drifted towards the short wavelength direction, the temperature control element is heated, the working wavelength of the laser is drifted towards the long wavelength direction, when the wavelength of the laser is adjusted in real time, the working wavelength of the arrayed waveguide grating AWG is considered to be unchanged, and the working wavelength of the arrayed waveguide grating AWG is opposite to the working wavelength of the laser, if the working wavelength of the arrayed waveguide grating AWG is drifted towards the long wavelength direction, the working wavelength of the laser is unchanged, namely, the working wavelength of the arrayed waveguide grating AWG is unchanged, and the working wavelength of the laser drifts to the short wave direction, so that the working wavelength of the laser can be adjusted in real time according to the power value of reflected light received by the optical detector PD, and the performance and stable work of the system are ensured.
Referring to fig. 6, further, after step S4, the method further includes:
and S41, reading the value of the temperature control element and setting the value as the working temperature value of the laser.
In the step S4a, the operating wavelength of the laser is already adjusted to the wavelength with the optimal error rate, the value of the temperature control element is obtained through software, and then the value is set to the operating temperature of the laser, and the operating wavelength of the laser is always at the optimal operating wavelength, so that the system operates stably.
Referring to fig. 7, a system for real-time wavelength adjustment of a wavelength division system includes:
the request module 1 is used for sending an error code issuing request to an optical line unit OLT at regular time;
the query module 2 is used for receiving the current error rate value issued by the optical line unit OLT after receiving the request;
the first judging module 3 is used for judging whether the current error rate performance is deteriorated according to the error rate value;
and the first regulating and controlling module 4 is used for regulating the temperature control element according to the regulating and controlling rule according to the change of the optical power value measured by the optical detector PD if the performance is deteriorated, regulating the working wavelength of the laser by regulating the temperature control element until the working wavelength of the laser works at the optimal error rate wavelength, and storing the optimal error rate value.
In the request module 1, the ONU may send an error code issuing request to the OLT at intervals, where the interval may be set, and the obtained error code is used to determine the operating state of the system.
Referring to fig. 8, further, the system for adjusting the wavelength of the wavelength division system in real time further includes:
the second adjusting module 11 is used for adjusting the temperature control element to heat the laser after the working wavelength of the laser is initialized;
a third judging module 12, configured to judge whether the current bit error rate is optimal;
and a fifth executing module 13, configured to save the current optimal error rate value if the third determining module is yes.
In the second adjusting module 11, the initialization of the laser wavelength is determined by determining the reflected optical power, when the emission wavelength of the laser is completely aligned with the central wavelength of the arrayed waveguide grating AWG, that is, when the reflected optical power is the maximum, the initialization of the wavelength is considered to be completed, and the laser is heated by adjusting the temperature control element, so that the working wavelength of the laser drifts toward the long-wavelength direction.
In the third judging module 12, the working wavelength of the laser drifts towards the long-wave direction, the reported bit error rate is better and better, when the optimal state of the optical equilibrium effect is reached (the central wavelength of the laser is aligned to the right side of the central wavelength of the arrayed waveguide grating AWG, the noise wave of 0 level is filtered out, and the signal of 1 electrical evaluation is promoted, so that the extinction ratio can be improved, and the performance of the whole system is improved), the bit error rate is optimal, at the moment, the laser is continuously heated through the temperature control element, the bit error rate is deteriorated, and whether the current bit error rate is optimal or not is judged by observing the reported bit error rate change condition.
In the fifth execution module 13, the optimum bit error rate is the optimum working state of the wavelength division system, and the current optimum bit error rate value is stored to subsequently determine whether the system performance has deteriorated.
In the above query module 2, after receiving the request sent by the optical network unit ONU, the optical line unit OLT queries the error code condition and issues the current error code value to the optical network unit ONU, and the optical network unit ONU receives the current error code value issued by the optical line unit OLT, thereby completing the protocol interaction with the optical line unit OLT.
In the first determining module 3, the ONU compares the received error rate value with a pre-stored optimal error rate value, and if the received error rate value is larger than the pre-stored optimal error rate value, or the received error rate value is larger than the pre-stored optimal error rate value, it may be determined that the current error rate performance is deteriorated, and the value is set according to the system requirements, so as to prevent that the small-range change may be a measurement error, for example, from 1E-5 to 1E-4, which is considered as deterioration, and this is determined by the user according to the system stability.
Referring to fig. 9, further, the system for adjusting the wavelength of the wavelength division system in real time further includes:
the second judging module 31 is configured to judge whether the error code rate value is greater than the stored optimal error code rate value;
a third executing module 32, configured to determine that the current performance is degraded if the second determining module is yes;
and a fourth executing module 33, configured to determine that the current performance is not degraded if the second determining module is negative.
In the second determination module 31, the ONU compares the received error rate value with the pre-stored optimal error rate value, and determines whether the received error rate value is greater than the pre-stored optimal error rate value, where the pre-stored optimal error rate value is obtained when the system is in the optimal working state, so as to determine whether the system has a deterioration due to a change in the error rate value.
In the third execution module 32, if the received error rate value is greater than the pre-stored optimal error rate value, it indicates that the system performance is deteriorated.
In the fourth execution module 33, if the received error rate value is not greater than the pre-stored optimal error rate value, it indicates that the system performance is not deteriorated.
In the first regulation and control module 4, the drift condition of the laser working wavelength can be known according to the change of the optical power value measured by the optical detector PD, so that the direction of the temperature control element can be adjusted according to the regulation and control rule, and the laser working wavelength is finely regulated by adjusting the temperature control element, so that the error rate is optimal again.
Referring to fig. 10, the first control module 4 includes:
the comparison submodule 4a 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 4b is used for adjusting the direction of the temperature control element to be temperature reduction if the optical power value becomes smaller, so that the working wavelength of the laser drifts towards the direction of short wave;
and the second execution submodule 4c is used for adjusting the direction of the temperature control element to be temperature-increased if the optical power value is increased, so that the working wavelength of the laser drifts towards the long wave direction.
The module obtains the drifting condition of the working wavelength of the laser according to the change of the optical power value measured by the optical detector PD when the performance is deteriorated, if the optical power value is reduced, the working wavelength of the laser is drifted towards the long wavelength direction, the temperature control element is cooled, the working wavelength of the laser is drifted towards the short wavelength direction, otherwise, if the optical power value is increased, the working wavelength of the laser is drifted towards the short wavelength direction, the temperature control element is heated, the working wavelength of the laser is drifted towards the long wavelength direction, when the wavelength of the laser is adjusted in real time, the working wavelength of the arrayed waveguide grating AWG is considered to be unchanged, and the working wavelength of the arrayed waveguide grating AWG is opposite to the working wavelength of the laser, if the working wavelength of the arrayed waveguide grating AWG is drifted towards the long wavelength direction, the working wavelength of the laser is unchanged, namely, the working wavelength of the arrayed waveguide grating AWG is unchanged, and the working wavelength of the laser drifts to the short wave direction, so that the working wavelength of the laser can be adjusted in real time according to the power value of reflected light received by the optical detector PD, and the performance and stable work of the system are ensured.
Referring to fig. 11, further, the system for adjusting the wavelength of the wavelength division system in real time further includes:
and the setting module 41 is used for reading the value of the temperature control element and setting the value as the working temperature value of the laser.
In the setting module 41, the operating wavelength of the laser is adjusted to the wavelength with the optimal error rate, the value of the temperature control element is obtained through software, and then the value is set to be the operating temperature of the laser, and the operating wavelength of the laser is always in the optimal operating wavelength, so that the system can stably operate.
Referring to fig. 12, an architecture for real-time wavelength division system wavelength adjustment includes an optical network unit ONU5, an arrayed waveguide grating AWG6, an optical line unit OLT7, an optical network unit ONU5 configured to receive a data signal sent by an optical line unit OLT7 to a user, an arrayed waveguide grating AWG6 configured to initialize a laser wavelength, perform real-time adjustment and multiplexing functions, an optical line unit OLT7 configured to receive a user request and send data to the user, a mirror FRM8 and an optical module 9, the mirror FRM8 disposed between the optical line unit OLT7 and the arrayed waveguide grating AWG6 for changing a polarization direction of light and transmitting a portion of light back to the optical module 9, the optical module 9 disposed on the optical network unit ONU5, the optical module 9 including a transmitting unit 91, a receiving unit 92, and a wavelength division multiplexer MUX93, the transmitting unit 91 configured to send a data request of the optical network unit ONU5 to the optical line unit OLT7 and receive light reflected by the mirror FRM8, the receiving unit 92 is configured to receive an optical signal sent by the optical line unit OLT7, the wavelength division multiplexer MUX93 is disposed at an intersection of optical paths of the transmitting unit 91 and the receiving unit 92 and is configured to combine and split optical waves of the transmitting unit 91 and the receiving unit 92, the transmitting unit 91 includes a partial mirror 911, a photodetector PD912, and a laser 913, the partial mirror 911 reflects light reflected by the mirror FRM8 to the photodetector PD912 below, and a side of the partial mirror 911 away from the wavelength division multiplexer MUX93 is provided with the laser 913.
The current working state of the whole system is obtained through protocol interaction between the optical line unit OLT7 and the optical network unit ONU5, a part of light emitted by the mirror FRM8 (faraday rotator mirror) returns to the optical module 9, in some embodiments, the part of mirror 911 may be a polarization beam splitter to reflect and transmit light with different polarizations, the part of mirror 911 reflects a part of light emitted by the mirror FRM8 to the optical detector PD912, the power intensity of reflected light detected by the optical detector PD912 can know the drift of the wavelength of the laser 913, the temperature control element under the laser 913 is controlled, so as to fine-tune the working wavelength of the laser 913, achieve the purpose of adjusting the laser in real time, prolong the service life of the optical module 9, ensure the performance and stable operation of the system, for example, when the optical network unit ONU5 finds that the performance of the system is deteriorated, the power intensity reflected light to the optical detector PD is inquired, if the optical power is increased, the central wavelength of the laser 913 can be shifted toward the central wavelength of the arrayed waveguide grating AWG6, and the operating wavelength of the laser 913 can be shifted toward the long wavelength direction by adjusting the temperature control element under the laser 913, so as to achieve the purpose of adjusting the wavelength of the laser in real time.
The method and the system for adjusting the wavelength of the wavelength division system in real time have the advantages that: the current working state of the whole system is obtained through protocol interaction of an optical network unit ONU and an optical line unit OLT, after the performance of the system is known to be deteriorated, the working temperature of a temperature control element is adjusted through detecting the optical power value detected by an optical detector PD, and the working wavelength of a laser is adjusted through adjusting the working temperature of the temperature control element, so that the system always works in the optimal error rate state, the wavelength of the laser is adjusted in real time, the service life of an optical module is prolonged, and the performance and stable work of the system are ensured.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope 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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| CN112397996B (en) * | 2019-08-16 | 2022-04-15 | 中国移动通信有限公司研究院 | Wavelength adjusting method and device and optical module |
| CN113824493A (en) * | 2020-06-19 | 2021-12-21 | 中兴通讯股份有限公司 | Optical module adjusting method, electronic device, apparatus, system and storage medium |
| CN112039598B (en) * | 2020-08-12 | 2022-01-07 | 烽火通信科技股份有限公司 | Channel power automatic search adjustment method and system based on bit error rate |
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| CN103916179B (en) * | 2014-03-28 | 2016-09-07 | 武汉光迅科技股份有限公司 | Method by local side optical line terminal monitoring user side tunable laser wavelength |
| US9236949B1 (en) * | 2014-06-24 | 2016-01-12 | Applied Optoelectronics, Inc. | Laser transceiver with improved bit error rate |
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| CN106207749A (en) * | 2016-08-29 | 2016-12-07 | 武汉光迅科技股份有限公司 | A kind of narrow linewidth semiconductor laser based on Single wavelength narrow-band-filter assembly frequency-selecting |
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