CN110798280A - Wavelength locking method and device, optical module and wavelength division multiplexing optical network - Google Patents
Wavelength locking method and device, optical module and wavelength division multiplexing optical network Download PDFInfo
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- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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Abstract
The application relates to a wavelength locking method, a wavelength locking device, an optical module and a wavelength division multiplexing optical network, and belongs to the technical field of optical communication. The method is applied to a first optical module in a wavelength division multiplexing optical network; the method comprises the following steps: determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the optical module drifts; and sending a drift announcement used for representing the wavelength drift of the target optical module so that the target optical module responds to the drift announcement to adjust the sending wavelength of the target optical module, and the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module. When the wavelength of the target optical module of the adjacent channel of the opposite end is determined to drift, the target optical module adjusts the wavelength sent by the target optical module by sending a drift announcement which represents that the wavelength of the target optical module drifts, so that the target optical module is locked at the central wavelength position of the corresponding signal channel, and thus, an additional optical device is not required to be added, and the cost is very low.
Description
Technical Field
The application belongs to the technical field of optical communication, and particularly relates to a wavelength locking method, a wavelength locking device, an optical module and a wavelength division multiplexing optical network.
Background
In a Wavelength Division Multiplexing (WDM) system, such as a WDM-PON (Wavelength Division Multiplexing-Passive Optical Network) system, as shown in fig. 1, different wavelengths transmitted by all Optical modules are combined by an Optical filter (such as an Arrayed Waveguide Grating (AWG)) and then transmitted to an opposite end, and the opposite end is divided by the Optical filter and then connected to each Optical module. Each optical module has a transmitting end and a receiving end, the transmitting end can only transmit the optical wavelength corresponding to the corresponding channel, for example, the optical module 1 can only transmit the wavelength 1, the optical module 2 can only transmit the wavelength 2, otherwise, the optical wavelength will be attenuated by the optical filter. Therefore, in order to optimize the transmission performance of the system, the wavelengths of the optical modules in the system are controlled to be near the center wavelength of the optical filter of the corresponding channel.
Therefore, the laser used in the optical module of the WDM system always needs to perform wavelength locking, and it is ensured that the wavelength is controlled at the center position of the channel corresponding to the optical filter. There are two ways of wavelength locking that are currently in common use: in the first mode, each optical module is controlled independently, namely, each optical module needs to be additionally provided with an etalon laser interferometer or other optical filter devices and a signal processing unit, so that the cost is high, and the hardware integration level is influenced; in the second mode, in order to reduce the cost, an etalon laser interferometer or other optical filter devices and a signal processing unit are added for centralized control after the main optical path is split, then the detection result is fed back to each optical module, and the wavelength of each optical module is adjusted.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a wavelength locking method, a wavelength locking device, an optical module and a wavelength division multiplexing optical network, so as to solve the problems of high cost and complicated process in the conventional wavelength locking method.
The embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a wavelength locking method, which is applied to a first optical module in a wavelength division multiplexing optical network; the method comprises the following steps: determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the optical module drifts; and sending a drift announcement used for representing the wavelength drift of the target optical module so that the target optical module responds to the drift announcement to adjust the sending wavelength of the target optical module, and the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module.
In the embodiment of the application, whether the wavelength of the optical module of the adjacent channel of the opposite terminal drifts or not is detected, and when the wavelength of the target optical module drifts, the wavelength of the target optical module is adjusted by sending the drift announcement which represents that the wavelength of the target optical module drifts, so that the target optical module is locked at the central wavelength position of the corresponding signal channel, and thus, an additional optical device is not required to be added, and the cost is very low.
With reference to a possible implementation manner of the embodiment of the first aspect, determining that a wavelength of a target optical module adjacent to a peer optical module corresponding to the target optical module drifts includes: detecting whether pilot signals of optical modules adjacent to an opposite-end optical module corresponding to the optical modules exist or not from received service signals, wherein one optical module corresponds to a unique pilot signal; if so, it is determined that the wavelength of the target optical module corresponding to the pilot signal has shifted. In the embodiment of the application, whether the pilot signal of the optical module adjacent to the opposite-end optical module corresponding to the pilot signal exists is detected by introducing the pilot signal, and when the pilot signal is detected, the wavelength of the target optical module corresponding to the pilot signal is determined to drift, so that the applicability of the scheme is better, and the method can be applied to the situation that the optical wavelengths sent by the optical modules are the same.
With reference to a possible implementation manner of the embodiment of the first aspect, the wdm optical network further includes a main control unit respectively connected to the peer optical module and the target optical module, and sends a drift notification for characterizing that the wavelength of the target optical module drifts, where the drift notification includes: and sending the drift announcement to the opposite-end optical module based on a signal channel of the opposite-end optical module so that the opposite-end optical module forwards the drift announcement to the target optical module through the main control unit. In the embodiment of the application, when both the opposite-end optical module and the target optical module are connected with the main control unit, the first optical module sends a drift notification to the opposite-end optical module based on a signal channel of the first optical module, so that the opposite-end optical module forwards the drift notification to the target optical module through the main control unit, and the target optical module is quickly notified of the drift on the basis of not increasing extra cost.
With reference to a possible implementation manner of the embodiment of the first aspect, the wdm optical network further includes a main control unit connected to the peer optical modules corresponding to the first optical module and the target optical module, and sends a drift notification for characterizing that the wavelength of the target optical module drifts, where the drift notification includes: and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module through the main control unit so as to enable the opposite-end optical module corresponding to the target optical module to send the drift notification to the target optical module based on a signal channel of the opposite-end optical module. In the embodiment of the application, when the opposite-end optical module and the first optical module corresponding to the target optical module are both connected with the main control unit, the first optical module forwards the drift notification to the opposite-end optical module corresponding to the target optical module through the main control unit, so that the opposite-end optical module corresponding to the target optical module sends the drift notification to the opposite end through a signal channel of the opposite-end optical module, and the drift notification is quickly notified to the target optical module on the basis of not increasing extra cost.
With reference to a possible implementation manner of the embodiment of the first aspect, when the first optical module is connected to an opposite optical module corresponding to the target optical module, sending a drift notification for characterizing that a wavelength of the target optical module drifts includes: and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module, so that the opposite-end optical module corresponding to the target optical module sends the drift notification to the target optical module based on a signal channel of the opposite-end optical module. In the embodiment of the application, when the first optical module is connected with the opposite-end optical module corresponding to the target optical module, the first optical module forwards the drift notification to the opposite-end optical module corresponding to the target optical module, so that the opposite-end optical module corresponding to the target optical module sends the drift notification to an opposite end through a signal channel of the opposite-end optical module, and the drift notification is quickly notified to the target optical module on the basis of not increasing extra cost.
With reference to a possible implementation manner of the embodiment of the first aspect, when the peer optical module is connected to the target optical module, sending a drift notification for characterizing that a wavelength of the target optical module drifts includes: and sending the drift announcement to the opposite-end optical module based on a signal channel of the opposite-end optical module so that the opposite-end optical module forwards the drift announcement to the target optical module. In the embodiment of the application, when the opposite-end optical module is connected with the target optical module, the first optical module sends a drift notification to the opposite-end optical module based on a signal channel of the first optical module, so that the opposite-end optical module forwards the drift notification to the target optical module, and the target optical module is quickly notified of the drift without increasing additional cost.
In a second aspect, an embodiment of the present application further provides a wavelength locking device, which is applied to a first optical module in a wavelength division multiplexing optical network; the device comprises:
a determining module, configured to determine that a wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the first optical module drifts;
and the sending module is used for sending a drift notification for representing the drift of the wavelength of the target optical module so as to enable the target optical module to respond to the drift notification to adjust the sending wavelength of the target optical module and enable the sending wavelength to be locked at the central wavelength position of a signal channel corresponding to the target optical module.
In a third aspect, an embodiment of the present application further provides an optical module, which is applied to a wavelength division multiplexing optical network, where the optical module includes: the system comprises a processor and a receiving end, wherein the processor is connected with the receiving end; the receiving end is used for receiving the service signal output by the opposite-end optical module and transmitting the received service signal to the processor; the processor is used for detecting whether pilot signals of optical modules adjacent to the corresponding opposite-end optical module exist or not from the received service signals, wherein one optical module corresponds to a unique pilot signal; if yes, determining that the wavelength of a target optical module corresponding to the pilot signal drifts; the processor is further configured to send a drift notification for indicating that the wavelength of the target optical module drifts, so that the target optical module adjusts the sending wavelength of the target optical module in response to the drift notification, and the sending wavelength is locked at a center wavelength position of a signal channel corresponding to the target optical module.
With reference to a possible implementation manner of the embodiment of the third aspect, the optical module further includes: a sending end; the processor is further configured to generate a unique pilot signal; the sending end is configured to acquire a service signal to be sent, perform set top for the service signal by using the pilot signal provided by the processor, and send the set top service signal to the opposite-end optical module.
In a fourth aspect, an embodiment of the present application further provides a wavelength division multiplexing optical network, including: the first optical module is used for determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the first optical module drifts; the first optical module is further configured to send a drift notification for characterizing that the wavelength of the target optical module drifts; and the target optical module is used for responding to the drift announcement to adjust the sending wavelength of the target optical module, so that the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The foregoing and other objects, features and advantages of the application will be apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not intended to be to scale as practical, emphasis instead being placed upon illustrating the subject matter of the present application.
Fig. 1 shows a schematic structure diagram of a wavelength division multiplexing optical network provided in the prior art.
Fig. 2 shows a schematic structural diagram of a wavelength division multiplexing optical network according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of another wavelength division multiplexing optical network according to an embodiment of the present application.
Fig. 4 shows a schematic frequency domain diagram of a traffic signal and a pilot signal provided by an embodiment of the present application.
Fig. 5 is a schematic diagram illustrating a principle of detecting wavelength shift of an adjacent channel of an opposite end according to an embodiment of the present application.
Fig. 6 shows a schematic structural diagram of an optical module provided in an embodiment of the present application.
Fig. 7 is a schematic flowchart illustrating a wavelength locking method according to an embodiment of the present application.
Fig. 8 is a block diagram illustrating a wavelength locker according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, relational terms such as "first," "second," and the like may be used solely in the description herein 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Further, the term "and/or" in the present application is only one kind of association relationship describing the associated object, and means that three kinds of relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.
In the wdm optical network system, each optical module can only transmit the optical wavelength corresponding to the corresponding channel, for example, the optical module 1 can only transmit the wavelength 1, the optical module 2 can only transmit the wavelength 2, otherwise, the optical wavelength is attenuated by the optical filter. In order to optimize the transmission performance of the optical network system, the transmission wavelength of the optical modules in the system is controlled to be near the center wavelength of the optical filter of the corresponding channel.
In view of the defects of the two conventional wavelength locking methods, embodiments of the present application provide a wavelength locking method, which adjusts the wavelength of an optical module with wavelength drift by detecting whether the wavelength of the optical module in an adjacent channel at an opposite end drifts and sending a drift notification when the wavelength drifts, so that the optical module with wavelength drift adjusts the wavelength of the optical module, and locks the optical module at the center wavelength position of a corresponding signal channel. Referring to fig. 2 and fig. 3, a wavelength division multiplexing optical network provided in an embodiment of the present application includes a plurality of optical modules and opposite optical modules corresponding to the plurality of optical modules one to one. Fig. 2 shows a case where optical modules at one end are interconnected with each other through one master control unit, and fig. 3 shows a case where optical modules at one end are connected in series. If the optical module located on the left side in the drawing is regarded as the home terminal, the optical module located on the right side in the drawing is regarded as the opposite terminal, and conversely, if the optical module located on the right side in the drawing is regarded as the home terminal, the optical module located on the left side in the drawing is regarded as the opposite terminal.
The wavelength division multiplexing optical network includes: the first optical module may be any one of the optical modules shown in fig. 2 or 3, and is not particularly limited to a fixed optical module. The first optical module is used for determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the first optical module drifts; and the optical module is also used for sending a drift announcement used for representing the drift of the wavelength of the target optical module; correspondingly, the target optical module is configured to adjust its own transmission wavelength in response to the drift notification, so that the transmission wavelength is locked at the center wavelength position of its corresponding signal channel.
For ease of understanding, the following description will be made in conjunction with specific examples. Assuming that the first optical module is the optical module 2 'in fig. 2, the peer optical module corresponding to the first optical module (the optical module 2') itself is the optical module 2, and the adjacent optical modules of the optical module 2 are the optical module 1 and the optical module 3, and assuming that the target optical module (i.e., the optical module in which the wavelength shifts) is the optical module 1. Since the opposite-end optical module (optical module 2) and the target optical module (optical module 1) are both connected to the main control unit, at this time, the route of the optical module 2' sending the drift notification for representing the wavelength drift of the optical module 1 is: and sending a drift announcement to the opposite-end optical module (optical module 2) based on the signal channel of the optical module, so that the opposite-end optical module (optical module 2) forwards the drift announcement to the target optical module (optical module 1) through the main control unit, so that the optical module 1 responds to the drift announcement to adjust the sending wavelength of the optical module, and the sending wavelength is locked at the central wavelength position of the signal channel corresponding to the optical module.
Assuming that the first optical module is the optical module 1 in fig. 2, the opposite optical module corresponding to the first optical module (the optical module 1) itself is (the optical module 1 '), and the adjacent optical module of the optical module 1 ' is the optical module 2 ', assuming that the wavelength of the optical module 2 ' is shifted, that is, the optical module 2 ' is the target optical module at this time. Since the opposite-end optical module (optical module 2) and the first optical module (optical module 1) of the target optical module are both connected to the main control unit, at this time, the route for the optical module 1 to send the drift notification for representing the wavelength drift of the optical module 2' is: the drift notification is forwarded to an opposite-end optical module (optical module 2) corresponding to the target optical module through the main control unit, so that the optical module 2 sends the drift notification to the target optical module (optical module 2 ') based on a signal channel of the optical module, so that the optical module 2' adjusts the sending wavelength of the optical module in response to the drift notification, and the sending wavelength is locked at the central wavelength position of the signal channel corresponding to the optical module.
Assuming that the first optical module is the optical module 3 in fig. 3, the peer optical module corresponding to the first optical module (the optical module 3) itself is (the optical module 3 '), and the adjacent optical modules of the optical module 3' are the optical module 2 'and the optical module 4', and assuming that the target optical module (i.e. the optical module having a wavelength that drifts away) is (the optical module 2 'and the optical module 4'), that is, the wavelengths of both the optical module 2 'and the optical module 4' drift away, since the peer optical module (the optical module 2 and the optical module 4) corresponding to the target optical module are both connected to the first optical module (the optical module 3), at this time, the line of the optical module 3 sending the drift notification for representing the wavelength drift of both the optical: the drift notification is forwarded to the opposite-end optical modules (the optical module 2 'and the optical module 4') corresponding to the target optical module, so that the optical module 2 'and the optical module 4' respectively send the drift notification to the target optical module (the optical module 2 'and the optical module 4') based on the signal channels of the optical module and the optical module respectively, so that the optical module 2 'and the optical module 4' respectively respond to the drift notification to adjust the sending wavelength of the optical module and lock the sending wavelength at the central wavelength position of the signal channel corresponding to the optical module.
Assuming that the first optical module is the optical module 2 'in fig. 3, the peer optical module corresponding to the first optical module (the optical module 2') itself is the optical module 2, the adjacent optical modules of the optical module 2 are the optical module 1 and the optical module 3, and the target optical module (i.e., the optical module in which the wavelength shifts) is assumed to be the optical module 3. Since the opposite-end optical module (optical module 2) is connected to the target optical module (optical module 3), at this time, a route through which the optical module 2' sends a drift notification for representing the wavelength drift of the optical module 3 is as follows: and sending a drift notification to the opposite-end optical module (optical module 2) based on the signal channel of the optical module, so that the opposite-end optical module (optical module 2) forwards the drift notification to the target optical module (optical module 3), so that the optical module 3 adjusts the sending wavelength of the optical module in response to the drift notification, and the sending wavelength is locked at the central wavelength position of the signal channel corresponding to the optical module.
In the embodiment of the present application, whether a wavelength drifts is identified by introducing a pilot signal into a traffic signal, and further, a mode that each optical module corresponds to a unique pilot signal is adopted to identify a corresponding optical wavelength. That is, the optical module needs to load a pilot signal with a fixed frequency in addition to modulating a normal service signal. For example, a fixed frequency signal is directly used to perform a top-tuning on a service signal, and then the fixed frequency signal and the service signal (i.e., the service signal carrying the pilot signal) are subjected to an electro-optical conversion and transmitted to an optical fiber. Because different optical module wavelengths load pilot signals with different frequencies, the frequency of the pilot signal can be used to identify the wavelength, and the amplitude of the pilot signal can be used to identify the optical power of the wavelength. Wherein, the frequency domain diagrams of the traffic signal and the pilot signal are shown in fig. 4.
Since neither optical filter (e.g., AWG) is ideal, and in general, the isolation at the center wavelengths of two adjacent channels is 20dB, the isolation decreases gradually as the wavelength of a channel shifts. For example, when the wavelength of the second channel does not drift, the first channel only has the pilot frequency of the channel in the frequency domain when detecting the pilot frequency of the channel; when the wavelength of the second channel has drift, the isolation of the optical filter is reduced, the first channel will detect the pilot frequency point of the second channel when performing pilot detection, and the pilot frequency point of the second channel detected by the first channel will gradually increase as the drift of the second channel increases, and the schematic diagram of the principle is shown in fig. 5. For example, normally, when the optical module 1 'detects the pilot of its own channel, it only detects the pilot signal corresponding to the optical module 1, and when the wavelength of the optical module 2 drifts, there is a possibility that the optical module 1' may detect the pilot frequency point of the optical module 2 by performing the pilot detection again (in this case, the drift direction of the wavelength of the optical module 2 is toward the optical module 1). Therefore, whether the adjacent wavelength drifts can be determined by measuring the magnitude of the pilot component of the adjacent channel, and in this way, the drift direction of the wavelength of the adjacent channel can also be detected, for example, when the pilot frequency point of the optical module 2 is detected during pilot detection by the optical module 1', the drift direction of the wavelength of the optical module 2 is directed to the optical module 1.
As shown in fig. 6, each optical module includes: a sending end, a receiving end and a processor. The processor is respectively connected with the sending end and the receiving end. The processor is configured to generate a unique pilot signal, where one optical module corresponds to one unique pilot signal, and the pilot signal may be continuous or discontinuous, and may be one frequency or multiple frequencies. A sending end, configured to obtain a service signal to be sent, perform a pilot tone to the service signal by using a pilot signal provided by a processor, and send the service signal (a service signal carrying the pilot signal) after the pilot tone is performed as an output signal; and the receiving end is used for receiving the service signal output by the opposite-end optical module and transmitting the received service signal to the processor. The processor is also used for detecting whether a pilot signal of an optical module adjacent to an opposite-end optical module corresponding to the processor exists in the received service signal; if yes, determining that the wavelength of a target optical module corresponding to the pilot signal drifts; and the optical transceiver is also used for sending a drift announcement used for representing the drift of the wavelength of the target optical module so as to enable the target optical module to respond to the drift announcement to adjust the sending wavelength of the optical transceiver, so that the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module.
Wherein, the sending end mainly includes: a Clock Data Recovery (CDR) unit for Data shaping; a data driving unit (Driver) for data driving; a Laser, such as a Direct Modulated Laser (DML) or an electro-absorption Modulated Laser (EML), is used to complete the electro-optic conversion. Normal traffic signals are sent to the fiber through the CDR, Driver, laser. The receiving end mainly includes: a Photodiode (PD) or an Avalanche Photodiode (APD), which is mainly used to complete photoelectric conversion; a Trans Impedance Amplifier (TIA) for signal amplification; a Clock Data Recovery (CDR) unit for Data shaping.
Wherein, the pilot signal generated by the processor is connected to a bias circuit of the laser so as to adjust the pilot signal to the optical signal; after the pilot signal is subjected to PD photoelectric conversion and TIA amplification, the pilot signal is sampled by an ADC, and then the frequency and the amplitude of the pilot signal are calculated by a processor. In addition, the pilot signal can also be detected by using a separate PD and amplifier by splitting the signal out with an optical splitter immediately before the PD.
The main control unit and the processor may be integrated circuit chips, and have signal processing capability. For example, it may be a general-purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), etc.; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The general purpose processor may be a microprocessor or the above-described master control unit and processor may be any conventional processor or the like.
Referring to fig. 7, steps included in a wavelength locking method applied to the first optical module in the wavelength division multiplexing optical network according to an embodiment of the present application will be described with reference to fig. 7.
Step S101: and determining that the wavelength of a target optical module adjacent to the corresponding opposite-end optical module drifts.
In view of the defects of the two conventional wavelength locking methods, in the embodiment of the present application, when an optical module transmits light, the wavelength of the optical module is not locked, but the wavelength of the optical module of an adjacent channel at the opposite end is detected whether to drift, and when the wavelength drifts, the transmission wavelength of the optical module with the wavelength drifts is adjusted to be locked at the center wavelength position of the corresponding signal channel, so that an additional optical device does not need to be added, and the cost is very low.
As an implementation manner, whether the wavelength of the opposite-end adjacent channel drifts may be determined by detecting a pilot frequency of the opposite-end adjacent channel, that is, whether a pilot signal of an optical module adjacent to the opposite-end optical module corresponding to the first optical module exists is detected by the first optical module from a received service signal, where one optical module corresponds to one unique pilot signal; if yes, the wavelength of the target optical module corresponding to the pilot signal is determined to be shifted.
Under normal conditions, a service signal received by the first optical module is a service signal sent by an opposite-end optical module of the first optical module, and the service signal only carries a pilot signal corresponding to the opposite-end optical module, but when the wavelength of an optical film block adjacent to the opposite-end optical module deviates, the first optical module may receive the service signal sent by the adjacent-end optical module, that is, the service signal sent by the adjacent-end optical module may be received in addition to the service signal sent by the opposite-end optical module, so that the received service signal also includes the pilot signal of an adjacent channel in addition to the pilot signal carrying the opposite-end optical module. For example, normally, the optical module 1 'only detects the pilot signal corresponding to the optical module 1 when detecting the pilot of its own channel, and when the wavelength of the optical module 2 drifts, the optical module 1' may detect the pilot frequency point of the optical module 2 when performing pilot detection (in this case, the drift direction of the wavelength of the optical module 2 is toward the optical module 1).
Wherein, when the first optical module is the middle optical module in fig. 2 or fig. 3, such as the optical module 2, the optical module 3, the optical module 2 ', or the optical module 3', etc., there are two optical modules adjacent to the corresponding opposite optical module, it is further possible to determine which optical module, in particular, is subject to wavelength drift, and, as an embodiment, it may be based on a stored wavelength versus pilot table to identify which optical module specifically experiences wavelength drift, for example, when the first optical module is the optical module 3, the corresponding opposite optical module is the optical module 3', and the adjacent optical modules of the optical module 3 ' are the optical module 2 ' and the optical module 4 ', when the optical module 3 detects the pilot signal of the optical module adjacent to the opposite end from the received traffic signal, the pilot signal, in particular the optical module 2 'and/or the optical module 4', is determined by means of a table look-up.
The pilot signals of the first optical module and the peer optical module may be the same, for example, the optical module 1 and the optical module 1' correspond to the same pilot signal, and may also be different.
As another embodiment, it may be directly identified whether the wavelength of the optical module of the opposite-end adjacent channel drifts based on the frequency of the optical wavelength transmitted by the optical module, that is, in this embodiment, no pilot signal needs to be additionally introduced. The embodiment is suitable for the situation that the frequency of the wavelength transmitted by each optical module is different, so that whether the wavelength of the optical module of the adjacent channel at the opposite end drifts or not can be directly identified based on the frequency of the wavelength transmitted by the optical module, and the implementation principle of the embodiment is the same as that of introducing the pilot signal.
Step S102: and sending a drift announcement used for representing the wavelength drift of the target optical module so that the target optical module responds to the drift announcement to adjust the sending wavelength of the target optical module, and the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module.
When determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the first optical module drifts, the first optical module sends a drift notification for representing the drift of the wavelength of the target optical module, so that the target optical module responds to the drift notification to adjust the sending wavelength of the first optical module, and the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the first optical module.
As an embodiment, when the wdm optical network further includes a main control unit respectively connected to the peer optical module and the target optical module, the line for sending a drift notification for characterizing the drift of the wavelength of the target optical module may be: and sending a drift announcement to the opposite-end optical module based on a signal channel of the optical module so that the opposite-end optical module forwards the drift announcement to the target optical module through the main control unit.
As an embodiment, when the wdm optical network further includes a main control unit connected to peer optical modules corresponding to the first optical module and the target optical module, the line for sending a drift notification for characterizing the drift of the wavelength of the target optical module may be: and the drift announcement is forwarded to an opposite-end optical module corresponding to the target optical module through the main control unit, so that the opposite-end optical module corresponding to the target optical module sends the drift announcement to the target optical module based on a signal channel of the opposite-end optical module.
As an embodiment, when the first optical module is connected to a peer optical module corresponding to the target optical module, a line for sending a drift notification for representing that the wavelength of the target optical module drifts may be: and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module so as to enable the opposite-end optical module corresponding to the target optical module to send the drift notification to the target optical module based on a signal channel of the opposite-end optical module.
As an embodiment, when the peer optical module is connected to the target optical module, the line for sending the drift notification for characterizing the drift of the wavelength of the target optical module may be: and sending a drift announcement to the opposite-end optical module based on a signal channel of the optical module so that the opposite-end optical module forwards the drift announcement to the target optical module.
The four embodiments shown above are referred to in the same parts of the device embodiments and will not be described here in order to avoid redundancy.
The embodiment of the present application further provides a wavelength locking device 100 applied to a first optical module in a wavelength division multiplexing optical network, as shown in fig. 8. The wavelength locker 100 includes: a determination module 110 and a sending module 120.
A determining module 110, configured to determine that a wavelength of a target optical module adjacent to a peer optical module corresponding to the first optical module drifts. Optionally, the determining module 110 is specifically configured to: detecting whether pilot signals of optical modules adjacent to an opposite-end optical module corresponding to the optical modules exist or not from received service signals, wherein one optical module corresponds to a unique pilot signal; if so, it is determined that the wavelength of the target optical module corresponding to the pilot signal has shifted.
A sending module 120, configured to send a drift notification for characterizing that the wavelength of the target optical module drifts, so that the target optical module adjusts the sending wavelength of the target optical module in response to the drift notification, and the sending wavelength is locked at a center wavelength position of a signal channel corresponding to the target optical module.
Optionally, the wdm optical network further includes a main control unit respectively connected to the peer optical module and the target optical module, and at this time, the sending module 120 is specifically configured to: and sending the drift announcement to the opposite-end optical module based on a signal channel of the opposite-end optical module so that the opposite-end optical module forwards the drift announcement to the target optical module through the main control unit.
Optionally, the wavelength division multiplexing optical network further includes a main control unit connected to the peer optical modules corresponding to the first optical module and the target optical module, where the sending module 120 is specifically configured to: and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module through the main control unit so as to enable the opposite-end optical module corresponding to the target optical module to send the drift notification to the target optical module based on a signal channel of the opposite-end optical module.
Optionally, when the first optical module is connected to an opposite-end optical module corresponding to the target optical module, at this time, the sending module 120 is specifically configured to: and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module, so that the opposite-end optical module corresponding to the target optical module sends the drift notification to the target optical module based on a signal channel of the opposite-end optical module.
Optionally, when the peer optical module is connected to the target optical module, at this time, the sending module 120 is specifically configured to: and sending the drift announcement to the opposite-end optical module based on a signal channel of the opposite-end optical module so that the opposite-end optical module forwards the drift announcement to the target optical module.
The wavelength locking device 100 provided in the embodiment of the present application has the same implementation principle and the same technical effects as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments for the parts of the device embodiments that are not mentioned.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A wavelength locking method is characterized in that the method is applied to a first optical module in a wavelength division multiplexing optical network; the method comprises the following steps:
determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the optical module drifts;
and sending a drift announcement used for representing the wavelength drift of the target optical module so that the target optical module responds to the drift announcement to adjust the sending wavelength of the target optical module, and the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module.
2. The method of claim 1, wherein determining that a wavelength of a target optical module adjacent to a peer optical module corresponding to the target optical module drifts comprises:
detecting whether pilot signals of optical modules adjacent to an opposite-end optical module corresponding to the optical modules exist or not from received service signals, wherein one optical module corresponds to a unique pilot signal;
if so, it is determined that the wavelength of the target optical module corresponding to the pilot signal has shifted.
3. The method according to claim 1 or 2, wherein the wdm optical network further includes a master control unit connected to the peer optical module and the target optical module, respectively, and the sending of a drift notification for characterizing the drift of the wavelength of the target optical module includes:
and sending the drift announcement to the opposite-end optical module based on a signal channel of the opposite-end optical module so that the opposite-end optical module forwards the drift announcement to the target optical module through the main control unit.
4. The method according to claim 1 or 2, wherein the wdm optical network further includes a master control unit connected to peer optical modules corresponding to the first optical module and the target optical module, respectively, and sends a drift notification for characterizing that the wavelength of the target optical module drifts, including:
and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module through the main control unit so as to enable the opposite-end optical module corresponding to the target optical module to send the drift notification to the target optical module based on a signal channel of the opposite-end optical module.
5. The method according to claim 1 or 2, wherein when the first optical module is connected to a peer optical module corresponding to the target optical module, sending a drift notification for characterizing a drift of a wavelength of the target optical module includes:
and forwarding the drift notification to an opposite-end optical module corresponding to the target optical module, so that the opposite-end optical module corresponding to the target optical module sends the drift notification to the target optical module based on a signal channel of the opposite-end optical module.
6. The method according to claim 1 or 2, wherein sending a drift notification for characterizing a drift of a wavelength of the target optical module when the peer optical module is connected to the target optical module comprises:
and sending the drift announcement to the opposite-end optical module based on a signal channel of the opposite-end optical module so that the opposite-end optical module forwards the drift announcement to the target optical module.
7. A wavelength locking device is characterized in that the wavelength locking device is applied to a first optical module in a wavelength division multiplexing optical network; the device comprises:
a determining module, configured to determine that a wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the first optical module drifts;
and the sending module is used for sending a drift notification for representing the drift of the wavelength of the target optical module so as to enable the target optical module to respond to the drift notification to adjust the sending wavelength of the target optical module and enable the sending wavelength to be locked at the central wavelength position of a signal channel corresponding to the target optical module.
8. An optical module, applied to a wavelength division multiplexing optical network, comprising: the system comprises a processor and a receiving end, wherein the processor is connected with the receiving end;
the receiving end is used for receiving the service signal output by the opposite-end optical module and transmitting the received service signal to the processor;
the processor is used for detecting whether pilot signals of optical modules adjacent to the corresponding opposite-end optical module exist or not from the received service signals, wherein one optical module corresponds to a unique pilot signal; if yes, determining that the wavelength of a target optical module corresponding to the pilot signal drifts;
the processor is further configured to send a drift notification for indicating that the wavelength of the target optical module drifts, so that the target optical module adjusts the sending wavelength of the target optical module in response to the drift notification, and the sending wavelength is locked at a center wavelength position of a signal channel corresponding to the target optical module.
9. The light module of claim 8, further comprising: a sending end;
the processor is further configured to generate a unique pilot signal;
the sending end is configured to acquire a service signal to be sent, perform set top for the service signal by using the pilot signal provided by the processor, and send the set top service signal to the opposite-end optical module.
10. A wavelength division multiplexed optical network comprising:
the first optical module is used for determining that the wavelength of a target optical module adjacent to an opposite-end optical module corresponding to the first optical module drifts;
the first optical module is further configured to send a drift notification for characterizing that the wavelength of the target optical module drifts;
and the target optical module is used for responding to the drift announcement to adjust the sending wavelength of the target optical module, so that the sending wavelength is locked at the central wavelength position of a signal channel corresponding to the target optical module.
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