CN115173937B - Method and device for automatically adjusting and detecting wavelength of locking optical module - Google Patents
Method and device for automatically adjusting and detecting wavelength of locking optical module Download PDFInfo
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- CN115173937B CN115173937B CN202210782382.2A CN202210782382A CN115173937B CN 115173937 B CN115173937 B CN 115173937B CN 202210782382 A CN202210782382 A CN 202210782382A CN 115173937 B CN115173937 B CN 115173937B
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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
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0775—Performance monitoring and measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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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
- H04Q11/0005—Switch and router 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
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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
- H04Q11/0005—Switch and router aspects
- H04Q2011/0007—Construction
- H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing
Abstract
The application relates to a method and a device for automatically adjusting and detecting the wavelength of a locking optical module, wherein the method comprises the following steps: acquiring the marker wavelength corresponding to each branch channel of the wavelength multiplexing demultiplexer according to the trafficability of the optical signals with different wavelengths in each branch channel of the wavelength multiplexing demultiplexer, wherein the wavelength of the optical signal with qualified trafficability is acquired; and automatically searching a center wavelength in the wavelength bandwidth of the corresponding branch channel based on the marker wavelength, and acquiring a locking result based on the center wavelength. The method does not need to manually adjust and measure the locking wavelength, improves the efficiency and reduces the cost.
Description
Technical Field
The present invention relates to the field of optical communications technologies, and in particular, to a method and an apparatus for automatically adjusting and locking a wavelength of an optical module.
Background
WDM (Wavelength Division Multiplexing ) is a transmission technology oriented to the 5G bearer network access layer. Currently, wavelength tunable optical modules are applied to WDM systems, and lasers of the wavelength tunable optical modules have two types: DML (Directly Modulated Laser, direct modulator laser) and EML (electro-ro-absorption Modulated Laser, electroabsorption modulated laser). The EML has large extinction ratio, small chirp and small dispersion cost, but has high cost and large power consumption. Compared with an EML type wavelength tunable optical module, the DML type wavelength tunable optical module has low cost and low power consumption, and is more suitable for large-scale business.
TEC (Thermo Electric Cooler, semiconductor refrigerator) is made using the peltier effect of semiconductor materials, commonly used for laser temperature control. Since lasers are very temperature sensitive, the requirements on TEC are also very high, including requiring that the TEC be very small in volume. The TEC temperature control wavelength adjustable optical module can control the wavelength adjustable optical module laser to emit different emission wavelengths by setting the TEC to work at different temperatures. Under the condition that other conditions are unchanged, the higher the TEC working temperature is, the larger the laser emission wavelength value is; the TEC working temperature is unchanged, and the emission wavelength of the laser is unchanged.
As shown in fig. 2, in the WDM wavelength multiplexing/demultiplexing application scenario, the central wavelength values of different branch channels of the wavelength multiplexing/demultiplexing device are different, and the optical module in the application scenario needs to support the adjustable emission wavelength, so that the emission wavelength equal to the central wavelength of the branch channel of the wavelength multiplexing/demultiplexing device can be adjusted. In the related art, the emission wavelengths of the TEC temperature control wavelength tunable optical module are manually set by multiple times to control the emission wavelength control parameters (TEC working temperature), and the emission wavelength is tuned and locked by using an expensive instrument (such as a spectrometer/a wavemeter) to measure the wavelength.
Disclosure of Invention
The embodiment of the invention provides a method and a device for automatically adjusting and detecting the wavelength of a locking optical module, which do not need to manually adjust and detect the locking wavelength, improve the efficiency and reduce the cost.
In one aspect, an embodiment of the present invention provides a method for automatically adjusting and locking a wavelength of an optical module, which is characterized in that the method includes the steps of:
obtaining the marker wavelength corresponding to each branch channel of the wavelength multiplexing demultiplexer according to the trafficability condition of the optical signals with different wavelengths in each branch channel of the wavelength multiplexing demultiplexer, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability;
and automatically searching a center wavelength in the wavelength bandwidth of the corresponding branch channel based on the marker wavelength, and acquiring a locking result based on the center wavelength.
In some embodiments, the obtaining the target wavelength corresponding to each branch channel of the wavelength multiplexing/demultiplexing device according to the trafficability difference of the optical signals with different wavelengths in each branch channel of the wavelength multiplexing/demultiplexing device includes the steps of:
continuously transmitting PRBS code streams to a wavelength multiplexing demultiplexer and detecting the passing condition of the PRBS code streams passing through each branch channel of the wavelength multiplexing demultiplexer, if the detection result is that the PRBS code streams are not passed or the PRBS code streams pass but error codes exist, modifying the wavelength control parameters of the optical module to adjust the transmitting wavelength, continuously transmitting the PRBS code streams based on the adjusted transmitting wavelength and continuously detecting the passing condition of the PRBS code streams;
if the detection result is that the PRBS code stream passes through and has no error code, recording the wavelength control parameter of the current emission wavelength of the optical module and the corresponding branch channel parameter;
and calculating the corresponding marker wavelength based on the wavelength control parameter and the corresponding branch channel parameter.
In some embodiments, when the wavelength control parameter of the optical module is modified to adjust the emission wavelength, the amount of modification is (D/2+Δλ)/r, where D is the channel spacing, r is the conversion coefficient of the emission wavelength increment and the wavelength control parameter increment, and Δλ is the wavelength step.
In some embodiments, the calculating the corresponding marker wavelength based on the wavelength control parameter and the corresponding branch channel parameter includes the steps of:
calculating a corresponding marker wavelength according to a first formula, the first formula comprising:
Tx＝Tm+(B+D)(x-m)/r，1≤m≤x≤N；
Tx＝Tm-(B+D)(m-x)/r，1≤x≤m≤N；
r＝Δλ/ΔT；
in the first formula, m is the serial number of a certain branch channel, tm is the value of a tagged wavelength control parameter corresponding to the branch channel m, tx is the value of a tagged wavelength control parameter corresponding to the branch channel x, x is the serial number of the xth branch channel, B is the wavelength bandwidth, D is the channel interval, N is the maximum number of branch channels of the wavelength multiplexing and demultiplexing device, r is the conversion coefficient of the increment of the emission wavelength and the increment of the wavelength control parameter, λ is the emission wavelength, Δλ is the wavelength step length, and Δt is the increment of the wavelength control parameter.
In some embodiments, automatically searching for a center wavelength within a corresponding branch channel wavelength bandwidth based on the marker wavelength and obtaining a locking result based on the center wavelength includes the steps of:
and continuously transmitting the PRBS code stream by taking the label wavelength as the transmitting wavelength of the optical module, detecting the trafficability of the PRBS code stream in a branch channel corresponding to the wavelength multiplexing demultiplexer, and if the detection result is no error code, then:
gradually reducing the wavelength control parameter of the emission wavelength of the optical module until the error code or the failure occurs for the first time, ending and recording the last wavelength control parameter value, and recording as Txmin;
gradually increasing the wavelength control parameter of the emission wavelength of the optical module until the error code or the failure occurs for the first time, ending and recording the last wavelength control parameter value, and recording as Txmax;
and calculating a wavelength control parameter Txcen corresponding to the center wavelength according to Txcen= (Txmin+Txmax)/2.
In some embodiments, when the wavelength control parameter of the emission wavelength of the optical module is gradually reduced and the wavelength control parameter of the emission wavelength of the optical module is gradually increased, the step size of delta lambda/r is reduced or increased, wherein r is a conversion coefficient of the increment of the emission wavelength and the increment of the wavelength control parameter, and delta lambda is the step size of the wavelength.
In some embodiments, the acquiring the locking result based on the center wavelength further includes:
writing Txcen into an optical module factory configuration table, wherein the optical module factory configuration table is stored in the optical module.
In a second aspect, an embodiment of the present invention provides a network device, where the network device includes: a memory and a processor, the memory storing at least one instruction, the at least one instruction loaded and executed by the processor to implement the method of any one of claims 1-6.
In a third aspect, an embodiment of the present invention provides a multi-wavelength automatic adjustment locking device, which includes an optical path gating unit, a micro control unit, and a transmission detection unit, and is characterized in that,
an optical path gating unit for receiving the optical signals of the plurality of wavelengths from the additional wavelength tunable optical module and transmitting the same to the wavelength multiplexing demultiplexer;
a transmission detection unit for detecting the trafficability of optical signals with different wavelengths through each branch channel of the wavelength multiplexing and demultiplexing device;
the micro control unit is used for determining the marker wavelength according to the trafficability of the optical signals with different wavelengths, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability; and, in addition, the processing unit,
the micro control unit is further used for controlling the additional wavelength tunable optical module to adjust the wavelength within the wavelength bandwidth of the corresponding branch channel based on the target wavelength, and determining the center wavelength according to the trafficability of the optical signal within the bandwidth detected by the sending detection unit.
In a fourth aspect, an embodiment of the present invention provides a multi-wavelength automatic tuning and locking device, which includes an optical path gating unit and a micro control unit, and is characterized in that,
the optical path gating unit is used for receiving the optical signals of a plurality of wavelengths from the additional wavelength tunable optical module and sending the optical signals to the wavelength multiplexing demultiplexer, wherein a sending detection unit is arranged in the additional wavelength tunable optical module and is used for detecting the trafficability of the optical signals of different wavelengths passing through each branch channel of the wavelength multiplexing demultiplexer;
the micro control unit is used for determining the marker wavelength according to the trafficability of the optical signals with different wavelengths, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability; and, in addition, the processing unit,
the micro control unit is further used for controlling the additional wavelength tunable optical module to adjust the wavelength within the wavelength bandwidth of the corresponding branch channel based on the target wavelength, and determining the center wavelength according to the trafficability of the optical signal within the bandwidth detected by the sending detection unit.
The technical scheme provided by the invention has the beneficial effects that:
compared with the traditional mode of progressively measuring the emission wavelength of the locking wavelength tunable optical module in the full-range wavelength, the embodiment of the invention utilizes the difference of the trafficability of the optical signals of different wavelengths of each branch channel of the wavelength multiplexing demultiplexer to calculate the bid wavelength of each branch channel by firstly measuring and adjusting, and then accurately searching and locking the central wavelength based on the wavelength bandwidth of each branch channel of the bid wavelength. The method realizes the rapid automatic measurement of a plurality of emission wavelengths of the locking wavelength adjustable optical module. And because the adjustment and measurement of the central wavelength of each branch channel is automatically searched (can be defined according to an algorithm) in the wavelength bandwidth of the channel, the wavelength interval between the branch channels and the wavelength bandwidths of other branch channels are avoided, the efficiency of adjusting and measuring and locking the emission wavelength is higher and more accurate, and the method is simpler and more convenient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for automatically adjusting and detecting the wavelength of a locked optical module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a WDM application scenario provided in an embodiment of the present invention;
FIG. 3 is a block diagram of a multi-wavelength automatic tuning and locking device according to an embodiment of the present invention;
FIG. 4 is a block diagram of a multi-wavelength automatic tuning and locking device according to an embodiment of the present invention;
FIG. 5 is a flowchart of a method for automatically adjusting and locking the wavelength of an optical module according to an embodiment of the present invention;
fig. 6 is a schematic diagram showing the effect of each branch channel of the wavelength multiplexing/demultiplexing device according to the embodiment of the present invention on the difference in the trafficability of optical signals with different wavelengths;
FIG. 7 is a flowchart of automatically testing and calculating the values of the control parameters of the wavelength multiplexer/demultiplexer corresponding to N branch channels when the wavelength tunable optical module provided by the embodiment of the invention does not include a transmission detection unit;
FIG. 8 is a flowchart of automatically testing and calculating the values of the control parameters of the wavelength of the marker corresponding to the N branch channels of the wavelength multiplexing/demultiplexing device when the wavelength tunable optical module provided by the embodiment of the invention comprises a transmission detection unit;
fig. 9 is a flowchart of automatically testing and calculating optimal values of optical module emission wavelength control parameters corresponding to central wavelengths of N branch channels when the wavelength tunable optical module provided in the embodiment of the present invention does not include a transmission detection unit;
fig. 10 is a flowchart of automatically testing and calculating optimal values of optical module emission wavelength control parameters corresponding to central wavelengths of N branch channels when the wavelength tunable optical module provided in the embodiment of the present invention includes a transmission detection unit;
FIG. 11 is a schematic diagram of searching for a first marker wavelength control parameter value according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a wavelength tunable optical module and a center wavelength of a target wavelength corresponding to N branch channels of a wavelength multiplexing/demultiplexing device according to an embodiment of the present invention;
fig. 13 is a schematic diagram of searching for a central wavelength control parameter value based on a marker wavelength control parameter value according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for automatically adjusting and locking the wavelength of an optical module, including the steps of:
s100, acquiring a marker wavelength corresponding to each branch channel of the wavelength multiplexing and demultiplexing device according to the trafficability of the optical signals with different wavelengths in each branch channel of the wavelength multiplexing and demultiplexing device, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability;
and S200, automatically searching a center wavelength in the wavelength bandwidth of the corresponding branch channel based on the target wavelength, and acquiring a locking result based on the center wavelength.
It can be understood that the locking result of automatically adjusting the wavelength of the locking optical module includes locking the emission wavelength of the corresponding channel and the control parameter value corresponding to the emission wavelength. For a TEC temperature-controlled wavelength tunable optical module, the control parameter value corresponding to the wavelength includes the TEC operating temperature.
The embodiment of the invention solves the problems of low efficiency, high cost and complicated process of manually setting the emission wavelength control parameter (TEC working temperature) of the TEC temperature control wavelength tunable optical module and manually tuning and locking the emission wavelength by using an expensive instrument (such as a spectrometer/a wavelength meter), obviously improves the efficiency, reduces the cost, ensures that the emission wavelength tuning and locking process is simple and convenient, and has practical significance for high-efficiency large-scale production and manufacture of the wavelength tunable optical module.
In some embodiments, S100 comprises the steps of:
s110, continuously transmitting the PRBS code stream to a wavelength multiplexing demultiplexer and detecting the passing condition of the PRBS code stream passing through each branch channel of the wavelength multiplexing demultiplexer, if the detection result is that the PRBS code stream is not passed or the PRBS code stream passes but an error code exists, modifying the wavelength control parameter of an optical module to adjust the emission wavelength, continuously transmitting the PRBS code stream based on the adjusted emission wavelength and continuously detecting the passing condition of the PRBS code stream;
s120, if the detection result is that the PRBS code stream passes through and has no error code, recording a wavelength control parameter of the current emission wavelength of the optical module and a corresponding branch channel parameter;
s130, calculating the corresponding marker wavelength based on the wavelength control parameter and the corresponding branch channel parameter.
Preferably, when the wavelength control parameter of the optical module is modified in S110 to adjust the emission wavelength, the amount of modification is (D/2+Δλ)/r, where D is the channel spacing, r is the conversion coefficient of the emission wavelength increment and the wavelength control parameter increment, and Δλ is the wavelength step.
In some embodiments, S130 calculates the corresponding marker wavelength according to a first formula, and the first formula includes:
Tx＝Tm+(B+D)(x-m)/r，1≤m≤x≤N；
Tx＝Tm-(B+D)(m-x)/r，1≤x≤m≤N；
Δλ＝rΔT；
in the first formula, m is the serial number of a certain branch channel, tm is the value of a marker wavelength control parameter corresponding to the branch channel m, tx is the value of the marker wavelength control parameter corresponding to the branch channel x, x is the serial number of the xth branch channel, B is the wavelength bandwidth, D is the channel interval, N is the maximum number of branch channels (i.e. the total number of branch channels) of the wavelength multiplexing demultiplexer, r is the conversion coefficient of the increment of the emission wavelength and the increment of the wavelength control parameter, λ is the emission wavelength, Δλ is the wavelength step length, Δλ is not fixed, the available value is 0.01nm, 0.05nm, 0.1nm, etc., and Δt is the increment of the wavelength control parameter, i.e. the increment or decrement of the emission wavelength λ, and the variable corresponding to the wavelength control parameter T.
In some embodiments, S200 comprises the steps of:
s210, continuously transmitting the PRBS code stream by taking the standard wavelength as the transmitting wavelength of the optical module, detecting the trafficability of the PRBS code stream in a branch channel corresponding to the wavelength multiplexing and demultiplexing device, and if the detection result is no error code, then:
gradually reducing the wavelength control parameter of the emission wavelength of the optical module until the error code or the failure occurs for the first time, ending and recording the last wavelength control parameter value, and recording as Txmin;
gradually increasing the wavelength control parameter of the emission wavelength of the optical module until the error code or the failure occurs for the first time, ending and recording the last wavelength control parameter value, and recording as Txmax;
and S220, calculating a wavelength control parameter Txcen corresponding to the center wavelength according to Txcen= (Txmin+Txmax)/2.
It will be appreciated that in S200 the center wavelength is automatically looked up in this way by stepwise decreasing and stepwise increasing the wavelength control parameter of the emission wavelength until an error or a malfunction occurs. The wavelength control parameter Txcen calculated in S220 is the wavelength control parameter corresponding to the center wavelength, and the emission wavelength is locked.
Preferably, when the wavelength control parameter of the emission wavelength of the optical module is gradually reduced and the wavelength control parameter of the emission wavelength of the optical module is gradually increased in S210, the reduction or the increase is performed in a delta lambda/r step, where r is a conversion coefficient of an increase of the emission wavelength and an increase of the wavelength control parameter, and delta lambda is a wavelength step.
In a specific embodiment, as shown in fig. 3 and 4, the embodiment of the present invention further provides a multi-wavelength automatic adjustment locking device, which is composed of a micro control unit, a transmission detection unit, an optical module socket, an optical path gating unit, a standard communication channel, and the like; the wavelength multiplexing demultiplexer, the TEC temperature control wavelength tunable optical module and the optical fiber are peripheral devices; the TEC temperature control wavelength adjustable optical module is inserted into the optical module socket and is divided into two types: an internal no-transmission detection unit is shown in fig. 3; another internal transmission detection unit is shown in fig. 4; the micro control unit controls, manages and sends the detection unit and light path gating unit through the standard communication channel, communicate with the adjustable light module through IIC channel; the transmission detection unit supports high-speed PRBS code stream transmission and error detection. In a specific embodiment, as shown in fig. 5, a method for automatically tuning and detecting the wavelength of a locked optical module includes the steps of:
s1, connecting a wavelength multiplexing demultiplexer and a multi-wavelength automatic adjustment locking device, and inserting a TEC temperature control wavelength adjustable optical module into an optical module socket;
s2, a multi-wavelength automatic adjustment and detection locking device starts adjustment and detection of a wavelength control parameter (TEC working temperature) emitted by a wavelength adjustable optical module, and automatically tests and calculates the values of the wavelength control parameters of the marker corresponding to N channels of the wavelength multiplexing and demultiplexing device;
s3, continuously adjusting and measuring emission wavelength control parameters (TEC working temperature) of the wavelength tunable optical module by the multi-wavelength automatic adjusting and locking device, and automatically testing and calculating optimal values of the emission wavelength control parameters of the optical module corresponding to the central wavelengths of the N channels;
s4, writing optimal values of optical module emission wavelength control parameters corresponding to N channel center wavelengths of the wavelength multiplexing demultiplexer into an optical module factory configuration table by a micro control unit in the multi-wavelength automatic adjustment locking device through an IIC channel;
and S5, when the engineering is opened, and the emission wavelength of the wavelength tunable optical module is required to be equal to the central wavelength of a certain channel of the wavelength multiplexing demultiplexer, only the optimal value of the emission wavelength control parameter corresponding to the central wavelength of the channel is required to be found out in an optical module factory configuration table and set.
In the S2 and S3, the difference of trafficability of each branch channel of the wavelength multiplexing/demultiplexing device for optical signals with different wavelengths is utilized, and the PRBS is used to transmit and detect, so as to obtain the wavelength control parameter value and the optimal value of the wavelength control parameter.
As shown in fig. 6, the effect of the difference in the trafficability of each branch channel of the wavelength multiplexing/demultiplexing device for different wavelength optical signals is expressed in:
when the current transmitting wavelength of the wavelength tunable optical module is far away from the wavelength bandwidth of the branch channel of the wavelength multiplexing demultiplexer which is currently gating, the wavelength tunable optical module sends out an optical signal carrying PRBS code stream which cannot pass through the branch channel of the wavelength multiplexing demultiplexer which is currently gating, and the receiving end detects that the high-speed PRBS code stream is not passing;
when the current emission wavelength of the wavelength tunable optical module is relatively close to the wavelength bandwidth of the branch channel of the wavelength multiplexing demultiplexer which is currently gated, the wavelength tunable optical module sends out an optical signal part carrying PRBS code stream to pass through the branch channel of the wavelength multiplexing demultiplexer which is currently gated, and the receiving end detects that the high-speed PRBS code stream can pass through but has error codes;
when the current transmitting wavelength of the wavelength tunable optical module is in the wavelength bandwidth of the branch channel of the currently-gated wavelength multiplexing and demultiplexing device, the wavelength tunable optical module sends out optical signals carrying PRBS code streams to pass through the branch channel of the currently-gated wavelength multiplexing and demultiplexing device, and the receiving end detects that the high-speed PRBS code streams have no error.
As shown in fig. 3 and 7, in a specific embodiment, when the wavelength tunable optical module does not include the transmission detection unit, the step S2 includes:
s21_a, the micro control unit sets the emission wavelength control parameter value of the wavelength tunable optical module to be T0 through the IIC channel (T0 is in the normal working temperature range of the TEC), and the emission wavelength of the optical module is lambda 0 at the moment;
the S22-a micro control unit sets a transmission detection unit through a standard communication channel 2, so that the transmission detection unit continuously transmits a high-speed PRBS code stream through a TX port;
s23_a, a sending detection unit receives a high-speed PRBS code stream through an RX port and detects an error rate;
the s24_a and the micro control unit set an optical path gating unit through a standard communication channel 1, so that the COM port is sequentially gated with a branch channel CHx (x=1, 2,..n), N is maximally taken, and a gating time interval is t, wherein the standard communication channel can be IIC, SPI, MDIO, and the minimum value of the gating time interval t is the time for the sending detection unit to complete error code detection.
And when the primary detection result of the sending detection unit is that the PRBS code stream is not enabled or the PRBS code stream has an error code, the micro control unit modifies the emission wavelength control parameter value of the wavelength tunable optical module through the IIC channel to be as follows: t0± (D/2+Δλ)/r, and executing steps s22_a to s24_a again, and performing the next PRBS code stream error detection;
it should be noted that D is a channel interval, T0 is an initial wavelength control parameter (TEC operating temperature), λ is an emission wavelength, Δλ is a wavelength step length, Δλ=rΔt, and r is a conversion coefficient between an emission wavelength increment and a TEC operating temperature increment.
It can be understood that, as shown in fig. 11, when the following detection result is that the PRBS code stream is not enabled or that the PRBS code stream has an error, the micro-control unit modifies (increases or decreases) the wavelength control parameter value emitted by the wavelength tunable optical module to be (D/2+Δλ)/r, and then performs steps s22_a to s24_a again for the next PRBS code stream error detection.
When the detection result is that the PRBS code stream has no error, recording a wavelength control parameter value Tm emitted by the wavelength tunable optical module and a current branch channel m, wherein Tm is a target wavelength control parameter value corresponding to the branch channel m;
s27—a, based on the index wavelength control parameter value Tm corresponding to the branch channel m, calculates N index wavelength control parameter values corresponding to each branch channel of the wavelength multiplexing/demultiplexing device, and stores the N index wavelength control parameter values in the index wavelength control parameter table; it should be noted that the wavelength control parameter table of the marker can be stored on the multi-wavelength automatic adjustment and measurement locking device.
The calculation formula is as follows:
Tx＝Tm+(B+D)(x-m)/r，1≤m≤x≤N；
Tx＝Tm-(B+D)(m-x)/r，1≤x≤m≤N；
Δλ＝rΔT；
wherein m is the serial number of a branch channel, tm is the label wavelength control parameter value (TEC working temperature) corresponding to the branch channel m, tx is the label wavelength control parameter value corresponding to the branch channel x, x is the serial number of the x-th branch channel, B is the wavelength bandwidth, D is the channel interval, N is the maximum branch channel number of the wavelength multiplexing demultiplexer, r is the conversion coefficient of the emission wavelength increment and the wavelength control parameter increment, and is a fixed value, λ is the emission wavelength, Δλ is the wavelength step length, Δλ takes the unfixed value, Δt is the wavelength control parameter increment, that is, the emission wavelength λ is increased or decreased by Δλ, and the variation corresponding to the wavelength control parameter T.
As shown in fig. 4 and 8, in a specific embodiment, when the wavelength tunable optical module includes a transmission detection unit, the step S2 includes:
s21_b, the micro control unit sets the emission wavelength control parameter value of the TEC temperature control wavelength tunable optical module to be T0 through the IIC channel (T0 is in the normal working temperature range of the TEC), and the emission wavelength of the optical module is lambda 0 at the moment;
s22_b, the micro control unit sends management information to the micro control unit 2 in the wavelength tunable optical module through the IIC channel, and indirectly sets the sending detection unit 2 in the wavelength tunable optical module, so that the sending detection unit continuously sends high-speed PRBS code streams through the TX port;
s23_b, the sending detection unit 2 receives the high-speed PRBS code stream through the RX port and detects the bit error rate;
the S24_b and the micro control unit are provided with an optical path gating unit through a standard communication channel 1, so that a COM port is sequentially gated with a branch channel CHx (x=1, 2,..n), N is maximally N, and the gating time interval is t; the standard communication channel may be IIC, SPI, MDIO, etc., where the minimum value of the gating time interval t is the time for the transmission detection unit to complete the error detection.
And when the primary detection result of the sending detection unit is that the PRBS code stream is not enabled or the PRBS code stream has an error code, the micro control unit modifies the emission wavelength control parameter value of the wavelength tunable optical module through the IIC channel to be as follows: t0 (+/-) (D/2+Deltalambda)/r, executing the steps S22_b to S24_b again, and carrying out the next PRBS code stream error detection;
it should be noted that D is a channel interval, T0 is an initial wavelength control parameter (TEC operating temperature), λ is an emission wavelength, Δλ is a wavelength step length, Δλ=rΔt, and r is a conversion coefficient between an emission wavelength increment and a TEC operating temperature increment.
It can be understood that, as shown in fig. 11, when the following detection result is that the PRBS code stream is not enabled or that the PRBS code stream has an error, the micro-control unit modifies (increases or decreases) the wavelength control parameter value emitted by the wavelength tunable optical module to be (D/2+Δλ)/r, and then performs steps s22_b to s24_b again to perform the next PRBS code stream error detection.
When the detection result is that the PRBS code stream has no error, recording a wavelength control parameter value Tm emitted by the wavelength tunable optical module and a current branch channel m, wherein Tm is a target wavelength control parameter value corresponding to the branch channel m;
and S27_b, calculating N index wavelength control parameter values corresponding to each branch channel of the wavelength multiplexing and demultiplexing device by the wavelength tunable optical module based on the index wavelength control parameter value Tm corresponding to the branch channel m, and storing the N index wavelength control parameter values into the index wavelength control parameter table.
Preferably, in steps s27_a and s27_b, when calculating N number of tagged wavelength control parameter values corresponding to each branch channel of the wavelength tunable optical module and the wavelength multiplexing/demultiplexing device,
the calculation formula is as follows:
Tx＝Tm+(B+D)(x-m)/r，1≤m≤x≤N；
Tx＝Tm-(B+D)(m-x)/r，1≤x≤m≤N；
Δλ＝rΔT；
wherein m is the serial number of a branch channel, tm is the value of a marker wavelength control parameter corresponding to the branch channel m, tx is the value of the marker wavelength control parameter corresponding to the branch channel x, x is the serial number of the x-th branch channel, B is the wavelength bandwidth, D is the channel interval, N is the maximum branch channel number of the wavelength multiplexing demultiplexer, r is the conversion coefficient of the increment of the emission wavelength and the increment of the wavelength control parameter, λ is the emission wavelength, Δλ is the wavelength step length, Δλ takes the unfixed value, Δt is the increment of the wavelength control parameter, that is, the emission wavelength λ is increased or decreased by Δλ, and the variation corresponding to the wavelength control parameter T.
After calculating the values of the N target wavelength control parameters corresponding to the N branch channels of the wavelength tunable optical module and the wavelength multiplexing/demultiplexing device, the relationship between the target wavelength and the center wavelength corresponding to the N branch channels of the wavelength multiplexing/demultiplexing device is shown in fig. 12.
As shown in fig. 3 and 9, in a specific embodiment, the wavelength tunable optical module does not include a transmission detection unit, and step S3 may specifically include:
s31_a, the micro control unit sets the emission wavelength control parameter value of the TEC temperature control wavelength tunable optical module as Tx through the IIC channel, x is more than or equal to 1 and less than or equal to n, and the emission wavelength of the optical module is the standard wavelength lambdax corresponding to CHx;
the S32-a micro control unit is provided with an optical path gating unit through a standard communication channel 1, so that a COM port and a branch channel CHx are gated;
the S33-a micro control unit sets a transmission detection unit through a standard communication channel 2, so that the transmission detection unit continuously transmits a high-speed PRBS code stream through a TX port;
s34-a, a sending detection unit receives a high-speed PRBS code stream through an RX port and detects an error rate, wherein the error rate is zero;
the micro control unit changes the transmission wavelength control parameter value Tx of the optical module, gradually and sequentially reduces the transmission wavelength control parameter value Tx by taking delta lambda/r as a step length until the first error code or the failure occurs, and records the last wavelength control parameter value Txmin;
as shown in fig. 13, the micro control unit changes the transmission wavelength control parameter value Tx of the optical module, gradually and sequentially decreases with a step of Δλ/r until the first occurrence of error codes or failure ends, and records the wavelength control parameter value Txmin set last time.
Wherein Tx is a wavelength control parameter (TEC working temperature), x is more than or equal to 1 and less than or equal to n; λ is the emission wavelength, Δλ is the wavelength step, Δλ=rΔt, and r is the conversion coefficient of the emission wavelength increment and the TEC operating temperature increment.
The S36-a micro control unit changes the transmission wavelength control parameter value Tx of the optical module, gradually and sequentially increases by taking delta lambda/r as a step length until the first occurrence of error codes or failure is finished, and records the last wavelength control parameter value Txmax;
as shown in fig. 13, the micro control unit changes the optical module emission wavelength control parameter Tx, gradually and sequentially increases with a step size of Δλ/r until the first occurrence of error codes or failure ends, and records the wavelength control parameter Txmax set last time.
Wherein Tx is a wavelength control parameter (TEC working temperature), x is more than or equal to 1 and less than or equal to N; λ is the emission wavelength, Δλ is the wavelength step, Δλ=rΔt, and r is the conversion coefficient of the emission wavelength increment and the TEC operating temperature increment.
S37_a, calculating an optimal value Txcen of an optical module emission wavelength control parameter corresponding to a central wavelength value of a branch optical channel CHx of the wavelength multiplexing and demultiplexing device, wherein the calculation formula is as follows: txcen= (Txmin+Txmax)/2, x is 1-N; it will be appreciated that Txcen may be stored in an optical module factory configuration table.
As shown in fig. 4 and 10, when the wavelength tunable optical module includes a transmission detection unit, step S3 may specifically include:
s31_b, the micro control unit sets the emission wavelength control parameter value of the TEC temperature control wavelength tunable optical module as Tx through the IIC channel, x is more than or equal to 1 and less than or equal to N, and the emission wavelength of the optical module is the marker wavelength lambdax corresponding to CHx;
the S32-b micro control unit is provided with an optical path gating unit through a standard communication channel 1, so that a COM port and a branch channel CHx are gated;
the S33-b micro control unit sends management information to the micro control unit 2 in the wavelength tunable optical module through the IIC channel, and indirectly sets the sending detection unit 2 in the wavelength tunable optical module to continuously send high-speed PRBS code stream through the TX port;
s34_b, the sending detection unit 2 receives the high-speed PRBS code stream through the RX port and detects the bit error rate, and the bit error rate is zero at the moment;
the micro control unit changes the transmission wavelength control parameter value Tx of the optical module, gradually and sequentially reduces the transmission wavelength control parameter value Tx by taking delta lambda/r as a step length until the first error code or the failure occurs, and records the last wavelength control parameter value Txmin;
as shown in fig. 12, the micro control unit changes the optical module emission wavelength control parameter Tx, gradually and sequentially decreases with a step size of Δλ/r until the first occurrence of error codes or failure ends, and records the wavelength control parameter Txmin set last time.
Wherein Tx is a wavelength control parameter (TEC working temperature), x is more than or equal to 1 and less than or equal to N; λ is the emission wavelength, Δλ is the wavelength step, Δλ=rΔt, and r is the conversion coefficient of the emission wavelength increment and the TEC operating temperature increment.
The S36_b, the micro control unit changes the transmitting wavelength control parameter value Tx of the optical module, gradually and sequentially increases by taking delta lambda/r as a step length until the first error code or the failure occurs, and records the last wavelength control parameter value Txmax;
as shown in fig. 12, the micro control unit changes the optical module emission wavelength control parameter Tx, gradually increases in steps with Δλ/r, until the first occurrence of error or failure ends, and records the wavelength control parameter Txmax set last time.
Wherein Tx is a wavelength control parameter (TEC working temperature), x is more than or equal to 1 and less than or equal to N; λ is the emission wavelength, Δλ is the wavelength step, Δλ=rΔt, and r is the conversion coefficient of the emission wavelength increment and the TEC operating temperature increment.
S37_b, calculating an optimal value Txcen of an optical module emission wavelength control parameter corresponding to a central wavelength value of a branch optical channel CHx of the wavelength multiplexing and demultiplexing device, wherein the calculation formula is as follows: txcen= (Txmin+Txmax)/2, 1.ltoreq.x.ltoreq.N.
As shown in fig. 3, an embodiment of the present invention provides a multi-wavelength automatic modulation and locking device, which includes an optical path gating unit, a micro control unit, and a transmission detection unit, wherein,
an optical path gating unit for receiving the optical signals of the plurality of wavelengths from the additional wavelength tunable optical module and transmitting the same to the wavelength multiplexing demultiplexer;
a transmission detection unit for detecting the trafficability of optical signals with different wavelengths through each branch channel of the wavelength multiplexing and demultiplexing device;
the micro control unit is used for determining the marker wavelength according to the trafficability of the optical signals with different wavelengths, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability; and, in addition, the processing unit,
the micro control unit is further used for controlling the additional wavelength tunable optical module to adjust the wavelength within the wavelength bandwidth of the corresponding branch channel based on the target wavelength, and determining the center wavelength according to the trafficability of the optical signal within the bandwidth detected by the sending detection unit.
It can be understood that, in the device provided in this embodiment, when the optical path gating unit, the sending detection unit, and the micro control unit implement the functions thereof, the corresponding same technical effects can be implemented based on the specific steps in the foregoing method embodiment.
As shown in fig. 4, an embodiment of the present invention provides a multi-wavelength automatic tuning and locking device, which includes, an optical path gating unit and a micro control unit, wherein,
the optical path gating unit is used for receiving the optical signals of a plurality of wavelengths from the additional wavelength tunable optical module and sending the optical signals to the wavelength multiplexing demultiplexer, wherein a sending detection unit is arranged in the additional wavelength tunable optical module and is used for detecting the trafficability of the optical signals of different wavelengths passing through each branch channel of the wavelength multiplexing demultiplexer;
the micro control unit is used for determining the marker wavelength according to the trafficability of the optical signals with different wavelengths, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability; and, in addition, the processing unit,
the micro control unit is further used for controlling the additional wavelength tunable optical module to adjust the wavelength within the wavelength bandwidth of the corresponding branch channel based on the target wavelength, and determining the center wavelength according to the trafficability of the optical signal within the bandwidth detected by the sending detection unit.
It can be understood that, in the device provided in this embodiment, when the optical path gating unit, the sending detection unit, and the micro control unit implement the functions thereof, the corresponding same technical effects can be implemented based on the specific steps in the foregoing method embodiment.
The embodiment of the invention also provides a network device, which comprises: the apparatus includes a memory and a processor, the memory storing at least one instruction loaded and executed by the processor to implement the method of any one of the method embodiments. It can be appreciated that the network device can achieve the corresponding technical effects achieved by the foregoing method.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer-readable storage media, which may include computer-readable storage media (or non-transitory media) and communication media (or transitory media).
It should be noted that in the present invention, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for automatically adjusting and locking the wavelength of the optical module is characterized by comprising the following steps:
obtaining the marker wavelength corresponding to each branch channel of the wavelength multiplexing demultiplexer according to the trafficability condition of the optical signals with different wavelengths in each branch channel of the wavelength multiplexing demultiplexer, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability;
and automatically searching a center wavelength in the wavelength bandwidth of the corresponding branch channel based on the marker wavelength, and acquiring a locking result based on the center wavelength.
2. The method for automatically adjusting and locking the wavelength of an optical module according to claim 1, wherein the step of obtaining the marker wavelength corresponding to each branch channel of the wavelength multiplexing and demultiplexing device according to the difference of trafficability of the optical signals with different wavelengths in each branch channel of the wavelength multiplexing and demultiplexing device comprises the following steps:
continuously transmitting PRBS code streams to a wavelength multiplexing demultiplexer and detecting the passing condition of the PRBS code streams passing through each branch channel of the wavelength multiplexing demultiplexer, if the detection result is that the PRBS code streams are not passed or the PRBS code streams pass but error codes exist, modifying the wavelength control parameters of the optical module to adjust the transmitting wavelength, continuously transmitting the PRBS code streams based on the adjusted transmitting wavelength and continuously detecting the passing condition of the PRBS code streams;
if the detection result is that the PRBS code stream passes through and has no error code, recording the wavelength control parameter of the current emission wavelength of the optical module and the corresponding branch channel parameter;
and calculating the corresponding marker wavelength based on the wavelength control parameter and the corresponding branch channel parameter.
3. The method of claim 2, wherein the modifying the wavelength control parameter of the optical module to adjust the emission wavelength is performed by an amount (D/2+Δλ)/r, where D is a channel spacing, r is a conversion coefficient of an increase in the emission wavelength and an increase in the wavelength control parameter, and Δλ is a wavelength step.
4. A method of automatically tuning a wavelength of a locked optical module as claimed in claim 2, wherein said calculating a corresponding target wavelength based on said wavelength control parameter and said corresponding branch channel parameter comprises the steps of:
calculating a corresponding marker wavelength according to a first formula, the first formula comprising:
Tx＝Tm+(B+D)(x-m)/r，1≤m≤x≤N；
Tx＝Tm-(B+D)(m-x)/r，1≤x≤m≤N；
r＝Δλ/ΔT；
in the first formula, m is the serial number of a certain branch channel, tm is the value of a tagged wavelength control parameter corresponding to the branch channel m, tx is the value of a tagged wavelength control parameter corresponding to the branch channel x, x is the serial number of the xth branch channel, B is the wavelength bandwidth, D is the channel interval, N is the maximum number of branch channels of the wavelength multiplexing and demultiplexing device, r is the conversion coefficient of the increment of the emission wavelength and the increment of the wavelength control parameter, λ is the emission wavelength, Δλ is the wavelength step length, and Δt is the increment of the wavelength control parameter.
5. The method for automatically tuning and locking the wavelength of an optical module according to claim 1, wherein automatically searching for a center wavelength within a corresponding branch channel wavelength bandwidth based on the target wavelength and obtaining a locking result based on the center wavelength comprises the steps of:
and continuously transmitting the PRBS code stream by taking the label wavelength as the transmitting wavelength of the optical module, detecting the trafficability of the PRBS code stream in a branch channel corresponding to the wavelength multiplexing demultiplexer, and if the detection result is no error code, then:
gradually reducing the wavelength control parameter of the emission wavelength of the optical module until the error code or the failure occurs for the first time, ending and recording the last wavelength control parameter value, and recording as Txmin;
gradually increasing the wavelength control parameter of the emission wavelength of the optical module until the error code or the failure occurs for the first time, ending and recording the last wavelength control parameter value, and recording as Txmax;
and calculating a wavelength control parameter Txcen corresponding to the center wavelength according to Txcen= (Txmin+Txmax)/2.
6. The method of automatically tuning a locked optical module wavelength as claimed in claim 5, wherein a step Δλ/r is reduced or increased when said step-down optical module emission wavelength control parameter and said step-up optical module emission wavelength control parameter are reduced, wherein r is a conversion coefficient of an emission wavelength increment and a wavelength control parameter increment, and Δλ is a wavelength step.
7. The method for automatically adjusting the wavelength of a locked optical module according to claim 6, further comprising, after obtaining a locking result based on the center wavelength:
writing Txcen into an optical module factory configuration table, wherein the optical module factory configuration table is stored in the optical module.
8. A network device, the network device comprising: a memory and a processor, the memory storing at least one instruction, the at least one instruction loaded and executed by the processor to implement the method of any one of claims 1-6.
9. The multi-wavelength automatic adjusting and locking device comprises an optical path gating unit, a micro control unit and a transmitting and detecting unit, and is characterized in that,
an optical path gating unit for receiving the optical signals of the plurality of wavelengths from the additional wavelength tunable optical module and transmitting the same to the wavelength multiplexing demultiplexer;
a transmission detection unit for detecting the trafficability of optical signals with different wavelengths through each branch channel of the wavelength multiplexing and demultiplexing device;
the micro control unit is used for determining the marker wavelength according to the trafficability of the optical signals with different wavelengths, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability; and, in addition, the processing unit,
the micro control unit is further used for controlling the additional wavelength tunable optical module to adjust the wavelength within the wavelength bandwidth of the corresponding branch channel based on the target wavelength, and determining the center wavelength according to the trafficability of the optical signal within the bandwidth detected by the sending detection unit.
10. The multi-wavelength automatic adjusting and locking device comprises an optical path gating unit and a micro control unit, and is characterized in that,
the optical path gating unit is used for receiving the optical signals of a plurality of wavelengths from the additional wavelength tunable optical module and sending the optical signals to the wavelength multiplexing demultiplexer, wherein a sending detection unit is arranged in the additional wavelength tunable optical module and is used for detecting the trafficability of the optical signals of different wavelengths passing through each branch channel of the wavelength multiplexing demultiplexer;
the micro control unit is used for determining the marker wavelength according to the trafficability of the optical signals with different wavelengths, wherein the marker wavelength is the wavelength of the optical signal with qualified trafficability; and the micro control unit is further used for controlling the additional wavelength tunable optical module to adjust the wavelength within the corresponding branch channel wavelength bandwidth based on the target wavelength, and determining the center wavelength according to the trafficability of the optical signal within the bandwidth detected by the sending detection unit.
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