CN113242094A - Optical module-based electric dispersion compensation method - Google Patents
Optical module-based electric dispersion compensation method Download PDFInfo
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- CN113242094A CN113242094A CN202110483909.7A CN202110483909A CN113242094A CN 113242094 A CN113242094 A CN 113242094A CN 202110483909 A CN202110483909 A CN 202110483909A CN 113242094 A CN113242094 A CN 113242094A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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Abstract
An electrical dispersion compensation method based on an optical module, comprising: waiting for the optical module to be in a ready state, initializing the optical module by the MCU, and finishing reset and initialization of the electric dispersion compensation chip; the method comprises the steps that after initialization of an electric dispersion compensation chip is completed, a reference mode is entered, an LOS (logic of output) judgment unit monitors a received electric signal according to a preset rule, and when the received electric signal triggers a DE _ LOS (Dee _ LoS) state of an optical module, the electric dispersion compensation chip starts to start an automatic calibration function; the electric dispersion compensation chip automatically runs a calibration algorithm, performs dispersion compensation on the electric signal converted by the receiving sub-module, and calibrates the optical module; and after the optical module finishes calibration, the optical module is switched from the reference mode to the master mode, so that the optical module works normally. The method is different from the conventional compensation design, the calibration coefficient is automatically updated according to the difference of the light source, the electric dispersion compensation coefficient is ensured to be always in the most appropriate range, and the application range is greatly improved.
Description
Technical Field
The invention relates to the field of optical communication, in particular to an electric dispersion compensation method based on an optical module.
Background
Dispersion is a phenomenon in which a complex color light is decomposed into a monochromatic light to form a spectrum, and it can bring a beautiful rainbow to people, but if dispersion occurs in an optical communication system, it is not so good. With the continuous improvement of the optical fiber manufacturing process, the optical fiber loss no longer plays a main limiting role in the transmission distance of an optical communication system, the increase of the dispersion is one of the primary limiting factors, when an optical pulse signal at the input end of an optical fiber is transmitted for a long distance, the optical pulse waveform is broadened in the time domain at the output end of the optical fiber, and the phenomenon is the dispersion. The dispersion will cause intersymbol interference, which will affect the correct decision of the optical pulse signal at the receiving end, the error rate performance deteriorates, and the information transmission is seriously affected. The dispersion needs to be compensated in a long-distance concatenation or FEC-free environment.
The optical dispersion compensation is to compensate dispersion by using a Dispersion Compensation Fiber (DCF) having negative frequency dispersion to reduce the total dispersion of the entire transmission line, but the Dispersion Compensation Fiber (DCF) has large loss, the nonlinearity of the fiber is strong, and it is difficult to compensate for a large range of dispersion slope by using the DCF. Therefore, the EDC technology is a good method for reducing cost, stabilizing and effectively. At present, the electric dispersion compensation mainly comprises feed-forward equalization and an MLSE algorithm. The feedforward equalization is difficult to apply in an optical module and often exists in a single-disk circuit of equipment due to the fact that a sampling unit and a filter circuit are needed and more components are needed by utilizing a negative feedback principle. The MLSE algorithm is pre-configured and has no real-time property, so the application range is limited.
Disclosure of Invention
In view of the above, the present invention has been made to provide an electrical dispersion compensation method based on an optical module that overcomes or at least partially solves the above-mentioned problems.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
an electrical dispersion compensation method based on an optical module, comprising:
s100, waiting for the optical module to be in a ready state, initializing the optical module by the MCU, and finishing reset and initialization of the electric dispersion compensation chip;
s200, the electric dispersion compensation chip enters a reference mode after initialization is completed, an LOS (logic of output) judgment unit monitors a received electric signal according to a preset rule, and the electric dispersion compensation chip starts to start an automatic calibration function after the received electric signal triggers a DE-LOS (Dee-LoS) state of an optical module;
s300, automatically operating a calibration algorithm by an electric dispersion compensation chip, performing dispersion compensation on the electric signal converted by the receiving secondary module, and calibrating the optical module;
and S400, after the optical module is calibrated, switching the optical module from the reference mode to the master mode to enable the optical module to work normally.
Further, in S200, the preset rule that the LOS determining unit monitors the received electrical signal is: and judging the received light power value, if the received light power value is larger than a preset minimum calibration value, triggering the DE _ LOS state of the optical module, and otherwise, triggering the LOS state of the optical module.
Further, the electric dispersion compensation chip automatically runs a calibration algorithm, which comprises: sampling and calibrating the received light for multiple times, producing a digital polynomial according to each calibration parameter, calculating and compensating the received electric eye diagram, and recovering the distorted eye diagram according to the compensation.
Furthermore, after the LOS state of the optical module is triggered, reset and initialization of the electric dispersion compensation chip are carried out again, so that the electric dispersion compensation chip enters a reference mode after the initialization is finished.
Further, the LOS judgment circuit can continuously monitor the received optical power, when the received optical power triggers the LOS, the optical module exits the working mode, the LOS judgment circuit waits for the electric signal monitored by the LOS judgment circuit to be in DE _ LOS again, the electric dispersion compensation chip is initialized, and the calibration work is carried out again.
Furthermore, the LOS judgment unit performs shunt sampling on the received electric signals and determines the number of sampling data according to the packaging form of the electric signals.
Further, the optical module meets the module structure size requirement of the SFF-8432 protocol and meets the DDM requirement of the SFF-8472 protocol.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the invention discloses an electric dispersion compensation method based on an optical module, which is different from the conventional compensation design, but carries out sampling calibration on received light for multiple times, produces a digital polynomial according to each calibration parameter, carries out calculation compensation on a received electric eye diagram, and restores a distorted eye diagram according to the compensation. The technology can automatically update the calibration coefficient according to different light sources, ensures that the electric dispersion compensation coefficient is always in the most appropriate range, and greatly improves the application range.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of an electrical dispersion compensation method based on an optical module in embodiment 1 of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the problems in the prior art, embodiments of the present invention provide an electrical dispersion compensation method based on an optical module.
Example 1
The embodiment discloses an electrical dispersion compensation method based on an optical module, as shown in fig. 1, including:
s100, waiting for the optical module to be in a ready state, initializing the optical module by the MCU, and finishing reset and initialization of the electric dispersion compensation chip; specifically, the optical module generally includes an optical device assembly, a main processor, a receiving limiting amplifier, and a laser driver, where the main processor, the receiving limiting amplifier, and the laser driver are used as circuit parts of the optical module and need to be initialized before operation. Specifically, after power is turned on, the main processor starts to execute a program, initializes itself first, and after initialization is completed, initializes the laser driver and the receiving limiting amplifier and other circuit units that need initialization.
S200, the electric dispersion compensation chip enters a reference mode after initialization is completed, an LOS (logic of output) judgment unit monitors a received electric signal according to a preset rule, and the electric dispersion compensation chip starts to start an automatic calibration function after the received electric signal triggers a DE-LOS (Dee-LoS) state of an optical module;
in this embodiment S200, the preset rule for the LOS determining unit to monitor the received electrical signal is: and judging the received light power value, if the received light power value is larger than a preset minimum calibration value, triggering the DE _ LOS state of the optical module, and otherwise, triggering the LOS state of the optical module. When the LOS state of the optical module is triggered, reset and initialization of the electric dispersion compensation chip are carried out again, so that the electric dispersion compensation chip enters a reference mode after the initialization is finished.
In some preferred embodiments, the LOS judging unit samples the received electrical signals in a shunt manner, and determines the number of the sampled data according to the packaging form of the electrical signals. The LOS judgment circuit can continuously monitor the received optical power, when the received optical power triggers the LOS, the optical module exits the working mode, the electric dispersion compensation chip is initialized and recalibrates after the LOS judgment circuit monitors that the electric signal is in the DE _ LOS again.
S300, automatically operating a calibration algorithm by an electric dispersion compensation chip, performing dispersion compensation on the electric signal converted by the receiving secondary module, and calibrating the optical module;
in this embodiment S300, the calibration algorithm automatically executed by the electrical dispersion compensation chip includes: sampling and calibrating the received light for multiple times, producing a digital polynomial according to each calibration parameter, calculating and compensating the received electric eye diagram, and recovering the distorted eye diagram according to the compensation.
Specifically, the electric dispersion compensation chip performs superposition sampling on the received electric signal eye diagram, respectively obtains corresponding functions from the first sample to the last sample according to set functions, and then fits the function relationship of each sample to obtain a final function for receiving electric signal compensation.
And S400, after the optical module is calibrated, switching the optical module from the reference mode to the master mode to enable the optical module to work normally.
In this embodiment, the optical module conforms to the module structure size requirement of the SFF-8432 protocol, and conforms to the DDM requirement of the SFF-8472 protocol.
The method for compensating electric dispersion based on an optical module disclosed by the embodiment is different from a conventional compensation design, and comprises the steps of sampling and calibrating received light for multiple times, producing a digital polynomial according to calibration parameters each time, calculating and compensating a received electric eye pattern, and recovering a distorted eye pattern according to compensation. The technology can automatically update the calibration coefficient according to different light sources, ensures that the electric dispersion compensation coefficient is always in the most appropriate range, and greatly improves the application range.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Of course, the processor and the storage medium may reside as discrete components in a user terminal.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
Claims (7)
1. An electrical dispersion compensation method based on an optical module, comprising:
s100, waiting for the optical module to be in a ready state, initializing the optical module by the MCU, and finishing reset and initialization of the electric dispersion compensation chip;
s200, the electric dispersion compensation chip enters a reference mode after initialization is completed, an LOS (logic of output) judgment unit monitors a received electric signal according to a preset rule, and the electric dispersion compensation chip starts to start an automatic calibration function after the received electric signal triggers a DE-LOS (Dee-LoS) state of an optical module;
s300, automatically operating a calibration algorithm by an electric dispersion compensation chip, performing dispersion compensation on the electric signal converted by the receiving secondary module, and calibrating the optical module;
and S400, after the optical module is calibrated, switching the optical module from the reference mode to the master mode to enable the optical module to work normally.
2. The method as claimed in claim 1, wherein the predetermined rule for the LOS determining unit to monitor the received electrical signal in S200 is: and judging the received light power value, if the received light power value is larger than a preset minimum calibration value, triggering the DE _ LOS state of the optical module, and otherwise, triggering the LOS state of the optical module.
3. The method as claimed in claim 1, wherein in S300, the calibration algorithm is automatically executed by the electrical dispersion compensation chip, and the method includes: sampling and calibrating the received light for multiple times, producing a digital polynomial according to each calibration parameter, calculating and compensating the received electric eye diagram, and recovering the distorted eye diagram according to the compensation.
4. The optical module-based electrical dispersion compensation method of claim 2, wherein after triggering the LOS status of the optical module, resetting and initializing the electrical dispersion compensation chip, so that the electrical dispersion compensation chip enters the reference mode after completing initialization.
5. The method as claimed in claim 1, wherein the LOS decision circuit continuously monitors the received optical power, when the received optical power triggers the LOS, the optical module exits the working mode, waits for the LOS decision circuit to monitor that the electrical signal is in DE _ LOS again, initializes the electrical dispersion compensation chip, and recalibrates the electrical dispersion compensation chip.
6. The method as claimed in claim 1, wherein the LOS determining unit performs a shunt sampling on the received electrical signal and determines the number of sampling data according to the packing format of the electrical signal in S200.
7. The method of claim 1, wherein the optical module complies with a module configuration size requirement of SFF-8432 protocol and complies with a DDM requirement of SFF-8472 protocol.
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