CN112118498B - Wavelength correction method of optical module and optical network system - Google Patents
Wavelength correction method of optical module and optical network system Download PDFInfo
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- CN112118498B CN112118498B CN201910535215.6A CN201910535215A CN112118498B CN 112118498 B CN112118498 B CN 112118498B CN 201910535215 A CN201910535215 A CN 201910535215A CN 112118498 B CN112118498 B CN 112118498B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
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Abstract
The invention discloses a wavelength correction method of an optical module and an optical network system, which receive a wavelength test message sent by a tested optical module; detecting the frequency of a pilot signal in the wavelength test message and the actual emission wavelength of the tested optical module; determining whether the measured optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module; and when the wavelength of the tested optical module is shifted, sending a wavelength correction instruction to the tested optical module to correct the wavelength. The pilot signal does not occupy the service and is used for identifying the standard emission wavelength of the optical module, the standard emission wavelength of the optical module can be determined by detecting the frequency of the pilot signal, whether the optical module generates wavelength shift or not can be determined by comparing the actual emission wavelength of the optical module with the standard emission wavelength, the emission wavelength of the optical module is corrected in time, and the influence on service transmission is avoided.
Description
Technical Field
The present invention relates to the field of optical communications technologies, and in particular, to a wavelength correction method for an optical module and an optical network system.
Background
Optical communication is a mainstream mode of data communication at present, and has the advantages of large communication capacity, long relay distance, good security, strong adaptability and the like. Optical communication data generally consists of a data source, an optical transmitter, an optical channel, and an optical receiver. When the optical module adopts the optical transmitting and receiving assembly, the optical module can simultaneously have the functions of optical transmitting and optical receiving. The optical module is used for realizing photoelectric conversion, the light emitting assembly converts an electric signal into an optical signal through a laser, and the optical signal is transmitted out through an optical fiber to realize data transmission; the optical receiving component receives an optical signal from the optical fiber and converts the optical signal into an electrical signal to realize data receiving.
The laser in the optical module can be used for data communication only when emitting light in a set waveband, however, the laser is not a pure single wavelength, and has a certain spectral width under the passing condition. As the service time and temperature of the laser vary, the center wavelength of the laser may shift, and if the shift exceeds the wavelength band used for optical communication, the data transmission may be affected, resulting in a series of problems such as data loss or data transmission error.
Disclosure of Invention
The invention provides a wavelength correction method of an optical module and an optical network system, which are used for correcting the wavelength of the optical module.
In a first aspect, the present invention provides a method for correcting a wavelength of an optical module, including:
receiving a wavelength test message sent by a tested optical module; the wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module;
detecting the frequency of a pilot signal in the wavelength test message and the actual emission wavelength of the tested optical module;
determining whether the tested optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the tested optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module;
when the wavelength deviation of the measured optical module is determined, a wavelength correction instruction is sent to the measured optical module, so that the measured optical module performs emission wavelength correction according to the wavelength correction instruction.
In a possible implementation manner, in the foregoing method provided by the present invention, the measured optical module sends the wavelength test message in the following manner:
the tested optical module periodically sends the wavelength test message; alternatively, the first and second electrodes may be,
and the tested optical module sends the wavelength test message when receiving the wavelength test instruction.
In a possible implementation manner, in the foregoing method provided by the present invention, the determining whether the measured optical module has a wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module, and the correspondence between the frequency of the pilot signal and the standard emission wavelength of the optical module includes:
determining the standard emission wavelength of the measured optical module according to the detected frequency of the pilot signal and the corresponding relation between the frequency of the pilot signal and the standard emission filter length of the optical module;
when the difference value between the actual emission wavelength and the standard emission wavelength is smaller than or equal to a set value, determining that the measured optical module does not generate wavelength deviation;
and when the difference value between the actual emission wavelength and the standard emission wavelength is larger than the set value, determining that the measured optical module generates wavelength deviation.
In a possible implementation manner, in the method provided by the present invention, the sending a wavelength correction instruction to the measured optical module includes:
determining a wavelength correction quantity of the measured optical module according to the actual emission wavelength and the standard emission wavelength of the measured optical module;
and sending the wavelength correction quantity and the message for executing the wavelength correction to the measured optical module as the wavelength correction instruction.
In a possible implementation manner, in the foregoing method provided by the present invention, the performing, by the measured optical module, emission wavelength correction according to the wavelength correction instruction includes:
when the measured optical module receives the wavelength correction instruction, the measured optical module analyzes the wavelength correction amount and the information for executing the wavelength correction;
and the measured optical module corrects the emission wavelength according to the wavelength correction quantity.
In a second aspect, the present invention provides an optical network system, including: the optical module comprises two arrayed waveguide gratings connected through optical fibers, a plurality of optical modules, an optical splitter and test equipment, wherein the optical modules, the optical splitter and the test equipment are respectively connected with channels of the arrayed waveguide gratings;
the main path optical fiber of the optical splitter is connected with the arrayed waveguide grating at one end, one path of branch optical fiber of the optical splitter is connected with the arrayed waveguide grating at the other end, and the other path of branch optical fiber of the optical splitter is connected with the test equipment;
the test equipment is used for detecting the frequency of a pilot signal in a wavelength test message and the actual emission wavelength of a tested optical module when the tested optical module sends the wavelength test message; determining whether the tested optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the tested optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module; when the wavelength deviation of the measured optical module is determined, a wavelength correction instruction is sent to the measured optical module through terminal equipment at one end, so that the measured optical module performs emission wavelength correction according to the wavelength correction instruction; the wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module.
In a possible implementation manner, in the optical network system provided by the present invention, the standard emission wavelengths of the optical modules are different from each other; the frequencies of the pilot signals configured to be paired with the standard transmission wavelengths of the optical modules are different from each other.
In a possible implementation manner, in the optical network system provided by the present invention, the pilot signal is a sine wave signal.
In a possible implementation manner, in the optical network system provided by the present invention, the optical module is a dual-band receiving optical module.
In a possible implementation manner, in the optical network system provided by the present invention, the optical module is a color tunable optical module.
The invention has the following beneficial effects:
the invention provides a wavelength correction method of an optical module and an optical network system, which receive a wavelength test message sent by a tested optical module; the wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module; detecting the frequency of a pilot signal in the wavelength test message and the actual emission wavelength of the tested optical module; determining whether the measured optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module; when the wavelength deviation of the tested optical module is determined, a wavelength correction instruction is sent to the tested optical module, so that the tested optical module performs emission wavelength correction according to the wavelength receiving correction instruction. The pilot signal does not occupy the service and is used for identifying the standard emission wavelength of the optical module. When the pilot signal transmitted by the optical module is acquired, the standard transmission wavelength of the optical module can be determined by detecting the frequency of the pilot signal, and whether the optical module has wavelength shift can be determined by comparing the actual transmission wavelength of the optical module with the standard transmission wavelength. When the emission wavelength of the optical module deviates, the emission wavelength of the optical module is corrected in time, so that the influence on service transmission is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical network system according to an embodiment of the present invention;
fig. 2 is a flowchart of a wavelength correction method for an optical module according to an embodiment of the present invention;
fig. 3a is a waveform diagram of a service signal provided by an embodiment of the present invention;
FIG. 3b is a waveform diagram of a control signal according to an embodiment of the present invention;
fig. 3c is a waveform diagram of a superimposed service signal and control signal provided by the embodiment of the present invention;
fig. 3d is a schematic diagram of a modulation depth test of a message channel according to an embodiment of the present invention;
fig. 3e is an eye diagram of a message channel according to an embodiment of the present invention;
fig. 4a is a waveform diagram of a superimposed traffic signal and a pilot signal according to an embodiment of the present invention;
fig. 4b is a schematic diagram of a pilot modulation depth test according to an embodiment of the present invention;
FIG. 4c is a waveform diagram of a pilot signal according to an embodiment of the present invention;
fig. 5 is a second schematic structural diagram of an optical network system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. 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.
Optical network systems use optical fibers as the primary transmission medium to build wide area networks, metropolitan area networks, or local area networks. The transmission device has the characteristics of high transmission speed, long transmission distance and the like. An optical path structure of an optical network system can be seen in fig. 1, as shown in fig. 1, the optical network system includes two Arrayed Waveguide Gratings (AWG) AWG1 and AWG2, the two Arrayed Waveguide Gratings are symmetrically disposed and connected by an optical fiber, the characteristics of the two Arrayed Waveguide Gratings may be the same, each Arrayed Waveguide grating includes N channels, each channel allows light with two wavelengths to pass through, for example, the channel 1 can only pass light with wavelengths λ 1-1 and λ 1-2, and the channel N can only pass light with wavelengths λ N-1 and λ N-2. Optical modules are respectively connected to the channels of the two arrayed waveguide gratings, the optical modules sequentially connected to the arrayed waveguide grating AWG1 on each channel are 1-N, and the optical modules sequentially connected to the arrayed waveguide grating AWG2 on each channel are 2-1-2-N. The optical module at the AWG1 side may be connected to the application system end, the optical module at the AWG2 side may be connected to the user end, and in specific applications, the optical module at the AWG1 side may also be connected to the user end, and the optical module at the AWG2 side is connected to the application system end, which is not limited herein.
In the specific implementation, the transmission wavelength and the reception wavelength of the optical module connected to each channel are fixed, and respectively correspond to two optical wavelengths allowed to pass through by the channel. For example, the wavelength of the emitted light of the optical module 1-1 connected to one end of the channel 1 is λ 1-1, and the wavelength of the received light of the optical module 1-1 is λ 1-2; the wavelength of the emitted light of the optical module 2-1 connected to the other end of the channel 1 is lambda 1-2, and the wavelength of the received light of the optical module 2-1 is lambda 1-1. The two optical modules 1-1 and 2-1 can realize mutual communication through the light with the wavelength, and the optical modules working at other wavelengths have different transmission light wavelengths from the two optical modules, so signals between channels cannot be influenced.
However, in the practical application process, since the reliability of the laser in the optical module is reduced when the laser is in a working state for a long time, the emission wavelength of the laser changes along with the change of conditions such as temperature, and the like, which causes the wavelength shift problem of the optical module, if the wavelength shift of the optical module is too serious, the corresponding channel cannot realize the transmission of the optical signal, and the optical module corresponding to the channel cannot normally receive the transmission optical signal, so that the service of the channel is interrupted.
In view of this, an embodiment of the present invention provides a method for correcting a wavelength of an optical module, as shown in fig. 2, the method includes:
s10, receiving a wavelength test message sent by a tested optical module;
s20, detecting the frequency of a pilot signal in the wavelength test message and the actual emission wavelength of the tested optical module;
s30, determining whether the measured optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module;
and S40, when the wavelength deviation of the tested light module is determined, sending a wavelength correction instruction to the tested light module so that the tested light module performs emission wavelength correction according to the wavelength correction instruction.
The wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module. In specific implementation, a pilot signal can be superimposed on the traffic signal of the optical module by means of external modulation of the laser. For example, a low frequency signal may be added to the bias current of the laser; or a low frequency modulation signal is added to the dc negative bias of the external modulator. In order to distinguish the traffic signal from the pilot signal, the pilot signal may be a low frequency signal, for example, the traffic signal currently in practical use is typically 10Gbps or 25Gbps, and the frequency of the pilot signal may be 50Kbps. The pilot signal does not occupy the service and is used for identifying the standard emission wavelength of the optical module. When the pilot signal transmitted by the optical module is acquired, the standard transmission wavelength of the optical module can be determined by detecting the frequency of the pilot signal, and whether the optical module has wavelength shift can be determined by comparing the actual transmission wavelength of the optical module with the standard transmission wavelength. When the emission wavelength of the optical module deviates, the emission wavelength of the optical module is corrected in time, so that the influence on service transmission is avoided.
It can be understood that, since the wavelengths of light allowed to be transmitted by each channel of the arrayed waveguide grating are different, the emission wavelengths of the optical modules required to be connected to each channel are also different. In order to distinguish the standard emission wavelengths of the optical modules, it is necessary to set different frequencies of pilot signals corresponding to the standard emission wavelengths. The pilot signal is generated by any of the above-mentioned ways, and the frequency adjustment of the pilot signal can be achieved by adjusting the frequency of the low frequency signal applied to the deflection current of the laser, or by adjusting the frequency of the low frequency signal applied to the dc negative bias of the external modulator. The frequency of the pilot signal is generally relatively stable and does not change with the change of the environment or the temperature, and different pilot signals are superposed on the service signal of the corresponding optical module and transmitted through the optical fiber.
It is worth noting that the pilot signal can be superposed on the service signal of the optical module to be sent when the transmission wavelength of the optical module needs to be monitored; or the optical module can be always superposed on the service signal of the optical module and sent in real time along with the service signal. The pilot signal has a frequency that is different from and significantly different from the frequency of the traffic signal, and therefore does not affect the traffic signal. The measured optical module is generally an optical module located at a far end (a user end), and the far end optical module is far away from the application system end and cannot be maintained in real time like the application system end. The embodiment of the invention can send the instruction to the remote optical module in a message channel mode, and monitor whether the remote optical module generates the wavelength shift by detecting the frequency of the pilot signal of the remote optical module and the actual emission wavelength.
In a specific implementation, the measured optical module may send a wavelength test message in the following manner:
the tested optical module periodically sends a wavelength test message; or, the measured optical module sends a wavelength test message when receiving the wavelength test instruction.
In an implementable manner, the measured optical module may autonomously send the wavelength test message at a specific period, and accordingly, the measured optical module may be set to detect the wavelength test message sent by the measured optical module at a synchronous period. In another implementable manner, the optical module at the application system side may send a wavelength test instruction to the measured optical module through the message channel, and the measured optical module sends a wavelength test message when receiving the wavelength test instruction. The two modes can be configured according to actual needs, and the embodiment of the invention is not limited. The mode that the measured optical module sends the wavelength test message at regular time can monitor the far-end optical module periodically, and is favorable for finding the abnormity of the far-end optical module in time. And the mode of adopting the instruction to control the wavelength test message to be sent does not occupy the network system resource too much, and has higher pertinence.
The message channel refers to a modulation means for low-frequency modulation of the control command. Specifically, the optical module at one end superimposes a coded low-frequency signal on the basis of a normally transmitted service signal, and transmits the low-frequency signal together with the service signal, and the optical module at the other end can analyze the coded low-frequency signal and determine which control instruction the low-frequency signal corresponds to, so that corresponding operation can be executed according to the control instruction. The message channel modulation depth of the low frequency signal may be defined as:
wherein, P (1) refers to the optical power of high level (1), P (0) refers to the optical power of low level (0), and the units of P (1) and P (0) are mW. The message channel modulation depth is the difference between the high level optical power and the low level optical power divided by 2 times the average optical power.
The modulation depth of the message channel may be test configured in the manner shown in fig. 3 a-3 e. Fig. 3a is a waveform diagram of a high-frequency traffic signal normally transmitted by an optical module, and fig. 3b is a waveform diagram of a low-frequency signal of a control command modulated by the optical module. After the low-frequency signal shown in fig. 3b is superimposed on the high-frequency signal shown in fig. 3a, a waveform as shown in fig. 3c can be obtained, which includes both the traffic signal transmitted by the optical module and the low-frequency signal for controlling the counterpart optical module to execute the corresponding instruction. When the optical module of the opposite side receives the signal sent by the optical module of the control side, as shown in fig. 3d, the optical signal is detected by the detector, the superimposed low-frequency signal can be identified by the low-pass filter, the waveform of the low-frequency signal can be displayed by the oscilloscope and the extraction of the message channel clock, and the modulation depth of the low-frequency signal in the message channel can be detected, wherein the eye diagram of the message channel is shown in fig. 3 e.
In order to enable the optical module to receive normal high-frequency service signals and low-frequency signals for controlling the optical module to implement a specific function, a conventional high-frequency signal receiving circuit and an added low-frequency signal receiving circuit should be included in the receiving circuit of the optical module. The low-frequency signal receiving circuit is used for receiving a low-frequency signal, and the low-frequency signal can correspond to different control instructions after being coded and is used for controlling the optical module to execute corresponding operations.
The pilot signal may be a sine wave signal having a specific frequency. Specifically, the optical module at one end superimposes a low-frequency sine wave signal on the basis of a normally transmitted service signal, and transmits the low-frequency sine wave signal together with the service signal, and when the test equipment receives the signal, the frequency of the sine wave signal and the actual emission wavelength of the optical module currently sending the optical signal can be detected. According to the corresponding relation between the frequency of the sine wave signal and the standard emission wavelength, whether the optical module which sends the optical signal at present generates wavelength deviation can be determined. The modulation depth of the pilot signal may be defined as:
where Pmax refers to the maximum optical power of the amplitude of the optical signal at the pilot modulation frequency, pmin refers to the minimum optical power of the amplitude of the optical signal at the pilot modulation frequency, and the units of Pmax and Pmin are both mW. The message channel modulation depth is the difference between the amplitude maximum optical power value and the amplitude minimum optical power value divided by 2 times the average optical power. The requirements of cutoff frequencies of the low-pass filters with the maximum modulation and the small modulation tests are different, the cutoff frequency of the low-pass filter during the minimum modulation depth test can be selected to be 60KHz, and the cutoff frequency of the low-pass filter during the maximum modulation depth test can be selected to be 280KHz.
The pilot modulation depth may be configured by testing in the manner shown in fig. 4 a-4 c. Fig. 4a shows a waveform diagram of a high-frequency service signal normally transmitted by an optical module superimposed with a low-frequency pilot signal, where the waveform diagram includes both the high-frequency service signal transmitted by the optical module and the low-frequency pilot signal used for identifying a standard emission wavelength. When the above signals are received, as shown in fig. 4b, the optical signal is detected by the detector, the superimposed low-frequency pilot signal can be identified by the low-pass filter, and the waveform of the low-frequency signal can be displayed by the oscilloscope and the pilot frequency extraction, and the modulation depth of the pilot signal can be detected, where the depth and the waveform of the pilot signal are shown in fig. 4 c.
In a specific implementation, in step S30, determining whether the measured optical module has a wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module, and the correspondence between the frequency of the pilot signal and the standard emission wavelength of the optical module may include:
determining the standard emission wavelength of the measured optical module according to the detected frequency of the pilot signal and the corresponding relation between the frequency of the pilot signal and the standard emission filter length of the optical module;
when the difference value between the actual emission wavelength and the standard emission wavelength is smaller than or equal to a set value, determining that the measured optical module does not generate wavelength deviation;
and when the difference value between the actual emission wavelength and the standard emission wavelength is larger than a set value, determining that the wavelength of the measured optical module is shifted.
As described above, the standard transmission wavelength of each optical module is preconfigured with the frequency of the corresponding pilot signal, that is, the frequency of the pilot signal is in one-to-one correspondence with the standard transmission wavelength of the optical module, and each frequency is unequal. When the frequency of the pilot signal carried by the wavelength test message of the measured optical module is detected, the standard emission wavelength of the measured optical module corresponding to the frequency of the pilot signal can be determined, and whether the measured optical module has a wavelength shift can be determined by comparing the actual emission wavelength of the measured optical module with the standard emission wavelength. Typically, an optical module can receive light within a small bandwidth of the center emission wavelength beyond which no optical signal can be received anymore. Therefore, in the embodiment of the present invention, when it is detected that the difference between the actual emission wavelength of the measured optical module and the standard emission wavelength is less than or equal to the set value, it may be determined that the emission wavelength of the measured optical module is within the receivable bandwidth range, and at this time, the measured optical module does not generate wavelength shift; when it is detected that the difference between the actual emission wavelength of the measured optical module and the standard emission wavelength is greater than the set value, it may be determined that the emission wavelength of the measured optical module is close to the receivable bandwidth boundary or exceeds the receivable bandwidth range, and at this time, the measured optical module has a wavelength shift and needs to perform wavelength correction on the measured optical module.
Further, in step S40, sending a wavelength correction instruction to the measured optical module may include:
determining the wavelength correction quantity of the measured optical module according to the actual emission wavelength and the standard emission wavelength of the measured optical module;
and sending the wavelength correction quantity and the message for executing the wavelength correction to the measured optical module as a wavelength correction instruction.
In general, the wavelength correction amount for the measured optical module can be obtained by making a difference between the standard emission wavelength and the actual emission wavelength of the measured optical module. After determining the wavelength correction amount, the wavelength correction amount and a message for performing the wavelength correction may be encoded and transmitted to the measured optical module via the message channel.
Accordingly, when the measured optical module receives the wavelength correction instruction, the emission wavelength correction may be performed in the following manner:
when the measured optical module receives the wavelength correction instruction, the information of wavelength correction and execution is analyzed;
and the measured optical module corrects the emission wavelength according to the wavelength correction quantity.
After analyzing the wavelength correction, the measured optical module may obtain the wavelength correction by analyzing a specific field in the received low-frequency signal, and correct the emission wavelength according to the wavelength correction.
In practical application, an optical module that needs to perform wavelength correction is generally a far-end optical module, when a problem of wavelength shift of the far-end optical module is detected, a terminal device at an application system end can write a wavelength correction amount into a corresponding storage area of the optical module at the system end through an I2C bus, and the optical module at the system end and the far-end optical module are located on the same channel of the arrayed waveguide grating. The wavelength correction amount may be a wavelength correction value, or a value that needs to be adjusted by a temperature controller for controlling a temperature change of the optical module, which is calculated from the wavelength correction value. And after the far-end optical module receives the value which needs to be adjusted by the temperature controller, the temperature of the temperature controller is adjusted, so that the central emission wavelength of a laser in the far-end optical module is changed under the temperature change, and the purpose of wavelength correction is achieved.
Based on the same inventive concept, another aspect of the embodiments of the present invention provides an optical network system, as shown in fig. 5, the optical network system provided in the embodiments of the present invention includes: the optical module comprises two arrayed waveguide gratings AWG1 and AWG2 connected through optical fibers, a plurality of optical modules 1-2-N respectively connected with channels of the arrayed waveguide gratings, an optical splitter S and test equipment T;
the main path optical fiber of the optical splitter S is connected with the arrayed waveguide grating AWG2 at one end, one path of branch optical fiber of the optical splitter S is connected with the arrayed waveguide grating AWG1 at the other end, and the other path of branch optical fiber of the optical splitter S is connected with the test equipment T;
the test device T is configured to detect a frequency of a pilot signal in the wavelength test message and an actual emission wavelength of the measured optical module when the measured optical module sends the wavelength test message; determining whether the measured optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module; when the wavelength deviation of the measured optical module is determined, a wavelength correction instruction is sent to the measured optical module through the terminal equipment at one end, so that the measured optical module performs emission wavelength correction according to the wavelength correction instruction. The wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module.
In specific implementation, the test device T has both frequency detection and wavelength detection functions, and is connected to the optical fiber between the two arrayed waveguide gratings through the optical splitter, so that optical signals sent by any channel of the arrayed waveguide gratings on both sides can be received simultaneously, and further the actual emission wavelength of any optical module in the optical network and the frequency of a pilot signal carried by the optical module can be detected. The test device T may have a processing function of determining whether a measured optical module has a wavelength shift, or may send detected data to a terminal device at any end in an optical network system, where the terminal device performs data processing, which is not limited herein. When it is determined that the measured optical module has wavelength shift, the terminal device located on the same side as the measured optical module may control the measured optical module to perform emission wavelength correction, or the terminal device located at a far end may control the measured optical module to perform emission wavelength correction in a message channel manner through the far-end optical module.
In practical application, the standard emission wavelengths of each optical module in the optical network system are different; the frequencies of the pilot signals arranged in pairs with the standard transmission wavelengths of the optical modules are different from each other. Therefore, the standard emission wavelength of the optical module can be uniquely identified through the carried frequency of the pilot signal, and when the actual emission wavelength is not consistent with the standard emission wavelength, the wavelength deviation of the optical module can be determined.
In practical applications, the pilot signal may be a sine wave signal with a specific frequency. The frequency of the sine wave is much smaller than the frequency of the traffic signal, belonging to low frequency signals. In addition, the message for controlling the optical module to perform the corresponding operation is also a low-frequency signal by modulating the signal, so that the optical module in the optical network system can adopt a dual-frequency receiving optical module, i.e. can receive a high-frequency service signal and can also receive a low-frequency control signal.
The optical module in the optical network provided by the embodiment of the invention can adopt a color tunable optical module, has a wavelength tunable function, can configure the number of channels through software, and is controlled by the software to switch the channels so as to switch the optical module to different working wave bands. The color light tunable optical module is a single-fiber bidirectional optical module, and the transmitting wavelength and the receiving wavelength are different. Optical modules are typically used in pairs, such as where the emission tunable wavelength at one end is λ 1-1 to λ N-1; the emission tunable wavelength at the other end is λ 1-2 to λ N-2. Receiving is generally broadband receiving, such as an optical module emitting tunable wavelengths λ 1-1 to λ N-1, receiving all light with a tunable wavelength λ 1-2 to λ N-2; the other end of the optical module emits light with adjustable wavelength from lambda 1-2 to lambda N-2 and receives all light with the wavelength from lambda 1-1 to lambda N-1. Therefore, the color light tunable optical module can be configured on the non-channel of the arrayed waveguide grating to realize the transmission and the reception of different wavelengths.
The wavelength correction method for the optical module and the optical network system provided by the embodiment of the invention receive the wavelength test message sent by the measured optical module; the wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module; detecting the frequency of a pilot signal in the wavelength test message and the actual emission wavelength of the tested optical module; determining whether the measured optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module; when the wavelength deviation of the tested optical module is determined, a wavelength correction instruction is sent to the tested optical module, so that the tested optical module performs emission wavelength correction according to the wavelength receiving correction instruction. The pilot signal does not occupy the service and is used for identifying the standard emission wavelength of the optical module. Then, when a pilot signal transmitted by the optical module is obtained, the standard transmission wavelength of the optical module can be determined by detecting the frequency of the pilot signal, and whether the optical module has wavelength shift can be determined by comparing the actual transmission wavelength of the optical module with the standard transmission wavelength. When the emission wavelength of the optical module deviates, the emission wavelength of the optical module is corrected in time, so that the influence on service transmission is avoided.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for wavelength correction of an optical module, comprising:
a system end optical module receives a wavelength test message sent by a measured optical module; the wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module;
a system end optical module detects the frequency of a pilot signal in the wavelength test message and the actual emission wavelength of the measured optical module;
the system end optical module determines whether the measured optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module;
when determining that the wavelength of the tested optical module is shifted, the system end optical module sends a wavelength correction instruction to the tested optical module, so that the tested optical module performs emission wavelength correction according to the wavelength correction instruction;
the measured optical module is a user side optical module;
the system end optical module sends a wavelength correction instruction to the measured optical module, and the method comprises the following steps:
the system end optical module determines the wavelength correction quantity of the measured optical module according to the actual emission wavelength and the standard emission wavelength of the measured optical module; taking the difference value between the standard emission wavelength and the actual emission wavelength of the measured optical module as the wavelength correction quantity;
and the system end optical module sends the wavelength correction amount and the message for executing the wavelength correction to the measured optical module as the wavelength correction instruction.
2. The method of claim 1, wherein the measured optical module sends the wavelength test message as follows:
the tested optical module periodically sends the wavelength test message; alternatively, the first and second electrodes may be,
and the tested optical module sends the wavelength test message when receiving the wavelength test instruction.
3. The method as claimed in claim 1, wherein the determining whether the measured optical module has a wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the measured optical module, and the corresponding relationship between the frequency of the pilot signal and the standard emission wavelength of the optical module comprises:
determining the standard emission wavelength of the measured optical module according to the detected frequency of the pilot signal and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module;
when the difference value between the actual emission wavelength and the standard emission wavelength is smaller than or equal to a set value, determining that the measured optical module does not generate wavelength deviation;
and when the difference value between the actual emission wavelength and the standard emission wavelength is larger than the set value, determining that the measured optical module generates wavelength deviation.
4. The method of claim 1, wherein the measured optical module performs emission wavelength correction according to the wavelength correction instruction, comprising:
when the measured optical module receives the wavelength correction instruction, the measured optical module analyzes the wavelength correction amount and the information for executing the wavelength correction;
and the measured optical module corrects the emission wavelength according to the wavelength correction quantity.
5. An optical network system, comprising: the optical module comprises two arrayed waveguide gratings connected through optical fibers, a plurality of optical modules, an optical splitter and test equipment, wherein the optical modules, the optical splitter and the test equipment are respectively connected with channels of the arrayed waveguide gratings;
the main path optical fiber of the optical splitter is connected with the arrayed waveguide grating at one end, one path of branch optical fiber of the optical splitter is connected with the arrayed waveguide grating at the other end, and the other path of branch optical fiber of the optical splitter is connected with the test equipment;
the test equipment is used for detecting the frequency of a pilot signal in a wavelength test message and the actual emission wavelength of a tested optical module when the tested optical module sends the wavelength test message; determining whether the tested optical module generates wavelength shift according to the frequency of the pilot signal, the actual emission wavelength of the tested optical module and the corresponding relation between the frequency of the pilot signal and the standard emission wavelength of the optical module; when it is determined that the measured optical module has wavelength shift, sending a wavelength correction instruction to the measured optical module through a terminal device at one end, so that the measured optical module performs emission wavelength correction according to the wavelength correction instruction; the wavelength test message carries a pilot signal, and the frequency of the pilot signal is configured in advance in a pairing manner with the standard emission wavelength of the optical module;
the measured optical module is a user side optical module; the test equipment is a system end optical module;
the test equipment is specifically used for determining a wavelength correction quantity of the measured optical module according to the actual emission wavelength and the standard emission wavelength of the measured optical module; taking the difference value between the standard emission wavelength and the actual emission wavelength of the measured optical module as the wavelength correction quantity; and sending the wavelength correction quantity and the message for executing the wavelength correction to the measured optical module as the wavelength correction instruction.
6. The optical network system of claim 5 wherein the standard emission wavelengths of each of the optical modules are different; the frequencies of the pilot signals arranged in pairs with the standard emission wavelengths of the optical modules are different from each other.
7. The optical network system of claim 5 wherein the pilot signal is a sine wave signal.
8. Optical network system according to any of claims 5-7, characterized in that the optical module is a dual frequency receive optical module.
9. The optical network system of claim 8 wherein the optical module is a color tunable optical module.
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| CN114167556B (en) * | 2021-12-10 | 2022-12-20 | 深圳市欧深特信息技术有限公司 | Wavelength adjusting method of multi-channel optical module, optical module and storage medium |
| CN117639947A (en) * | 2022-08-12 | 2024-03-01 | 武汉光迅科技股份有限公司 | Wave correction method, device, equipment and readable storage medium |
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