CN113206704A - Optical module with EDC function and capable of calibrating received signals in real time and method - Google Patents
Optical module with EDC function and capable of calibrating received signals in real time and method Download PDFInfo
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- CN113206704A CN113206704A CN202110291147.0A CN202110291147A CN113206704A CN 113206704 A CN113206704 A CN 113206704A CN 202110291147 A CN202110291147 A CN 202110291147A CN 113206704 A CN113206704 A CN 113206704A
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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
- H04B10/25—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
- H04B10/25133—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion including a lumped electrical or optical dispersion compensator
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6161—Compensation of chromatic dispersion
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Abstract
An optical module with an EDC function and capable of calibrating a received signal in real time and a method thereof are provided, the method comprises: the MCU continuously monitors the light power of the light signal received by the light receiving unit, and controls the working state of the EDC chip when the light power is monitored to be larger than the set minimum calibration value; and the EDC chip samples and analyzes the electric signal subjected to the photoelectric conversion of the ROSA under the control of the MCU unit, and then performs optimized dispersion compensation according to an analysis result. The invention is different from the conventional 25G product which directly carries out 3R processing on the received signal, but carries out certain algorithm processing according to the quality of the received signal, and carries out dispersion compensation on the received light by certain algorithm, thereby prolonging the transmission distance of the module.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an optical module with an EDC function and capable of calibrating a received signal in real time and a method.
Background
The dispersion is a pulse broadening phenomenon of light with different frequencies in optical fiber transmission, with the continuous improvement of 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 dispersion increases as one of the primary limiting factors, after an optical pulse signal at the input end of an optical fiber is transmitted in 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 dispersion. The dispersion of the fiber is divided into three types: modal dispersion, material dispersion and waveguide dispersion, where modal dispersion occurs only in multimode fibers. Taking the dispersion phenomenon in a single-mode fiber as an example, 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 severely affected. The g.652 standard optical fiber used in the optical fiber communication at present is designed for laid 1310nm, which can ensure that the total dispersion of the whole optical fiber line is approximately zero, and for DWDM system, because the system is mainly applied to 1550nm window, if g.652 optical fiber is used, the dispersion compensation optical fiber (DCF) with negative frequency dispersion needs to be used to compensate the dispersion, and reduce the total dispersion of the whole transmission line, but because the loss of the dispersion compensation optical fiber (DCF) is large, the nonlinearity of the optical fiber is strong, and the compensation of the dispersion slope in a large range is difficult to realize by using DCF. Therefore, the dispersion compensation of the optical signal transmitted through the optical fiber and generating dispersion is performed from the module receiving end by using EDC (Electrical dispersion compensation) to achieve an effective method of extending the transmission distance and having low cost. At present, the method of dispersion compensation mainly comprises that an electric chip directly carries out signal compensation and carries out dispersion compensation through a specific algorithm, but both methods have certain limitations.
Disclosure of Invention
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide an optical module and a method for calibrating a received signal in real time with an EDC function, which overcome or at least partially solve the above problems, and the specific scheme is as follows:
as a first aspect of the present invention, an optical module with an EDC function and capable of calibrating a received signal in real time is provided, where the optical module includes an optical receiving unit, an MCU unit, and an EDC chip;
the optical receiving unit is used for receiving optical signals transmitted by another optical module and converting the optical signals into corresponding electrical signals through a receiver optical subassembly ROSA;
the MCU unit is used for continuously monitoring the light power of the light signal received by the light receiving unit, and controlling the working state of the EDC chip when the light power is monitored to be greater than the set minimum calibration value;
and the EDC chip is used for sampling, analyzing and calculating the electric signal subjected to the photoelectric conversion of the optical receiver subassembly ROSA under the control of the MCU unit to obtain new calibration parameters.
And the working state of the optical module has real-time performance, and if the light is smaller than the judgment threshold value, the optical module automatically stops working and waits for the condition of starting next time.
The optical module has adaptability in receiving performance, and automatic parameter adjustment is carried out according to the quality of received signals so as to optimize parameter configuration.
Further, the dispersion compensation of the electrical signal after the photoelectric conversion of the ROSA optical subassembly by the EDC chip under the control of the MCU specifically includes:
sampling and analyzing an electric signal subjected to ROSA photoelectric conversion of the optical receiving subassembly based on a calibration algorithm of an EDC chip, calculating to obtain new configuration parameters, and updating a register in the EDC chip based on the configuration parameters;
and performing dispersion compensation on the electric signal subjected to photoelectric conversion of the ROSA on the basis of a self dispersion compensation algorithm through the updated register configuration value, and performing parameter optimization according to an optimization principle.
In addition, the EDC chip calculates a group of configuration parameters according to analysis after sampling the electric signal, but the EDC chip is too ideal and is still a little different from the actual EDC chip, and the parameters are further finely adjusted according to the specific receiving light condition, namely, the configuration parameters after dispersion compensation are optimized and adjusted to minimize the calculation error.
The invention can calibrate the parameters of the optical signals received in different occasions in real time so as to achieve the optimal parameter configuration, improve the sensitivity index of the module and improve the adaptability of the system to different use environments. When an optical signal enters an optical module and the optical power is stable, the ROSA converts the optical signal into a stable electrical signal, the EDC chip starts to calibrate the received electrical signal, a calibration algorithm can change some registers in the EDC chip, the algorithm can search for the optimal configuration parameters for 256 × 128 × 8 times through cyclic sampling calculation, and the optical signal subjected to dispersion is compensated to a certain degree through the calibrated configuration parameters, so that the purpose of optimizing the sensitivity is achieved.
Further, the MCU unit is specifically configured to: when the monitored optical power is larger than the set minimum calibration value, controlling the EDC chip to initialize, loading the default initial register configuration value into the EDC chip, so that the EDC chip enters a reference-mode state, and after the EDC chip is calibrated and the register configuration value is updated, controlling the EDC chip to be converted from the reference-mode state into a master-mode state;
the EDC chip calibrates the electric signal after the ROSA photoelectric conversion of the optical receive sub-assembly based on the calibration algorithm of the EDC chip in a reference-mode state to obtain optimized configuration parameters, updates a register in the EDC chip based on the configuration parameters, and performs dispersion compensation on the electric signal after the ROSA photoelectric conversion of the optical receive sub-assembly based on the dispersion compensation algorithm of the EDC chip in a master-mode state through the updated register configuration value.
Further, the MCU unit is also used for monitoring the state of the thermoelectric cooler TEC, and the working state of the EDC chip is controlled only after the thermoelectric cooler TEC is stable.
Further, the ROSA is a Linear ROSA.
As a second aspect of the present invention, there is provided a method of calibrating a received signal with an EDC function in real time, the method including:
and 2, the EDC chip samples and analyzes the electric signal subjected to the photoelectric conversion of the ROSA of the optical receiving subassembly under the control of the MCU unit, calculates a configuration value and optimizes parameters to achieve optimal dispersion compensation configuration.
Further, the dispersion compensation of the electrical signal after the photoelectric conversion of the ROSA optical subassembly by the EDC chip under the control of the MCU specifically includes:
sampling and analyzing an electric signal subjected to ROSA photoelectric conversion of the optical receiving subassembly based on a calibration algorithm of the EDC chip to obtain new configuration parameters, and updating a register in the EDC chip based on the configuration parameters;
and optimizing the parameters based on an optimization principle through the updated register configuration value to achieve the maximum dispersion compensation of the electrical signal subjected to the photoelectric conversion of the ROSA.
Further, the MCU unit controls the operating state of the EDC chip specifically as follows: when the monitored optical power is larger than the set minimum calibration value, controlling the EDC chip to initialize, loading the default initial register configuration value into the EDC chip, so that the EDC chip enters a reference-mode state, and after the EDC chip is calibrated and the register configuration value is updated, controlling the EDC chip to be converted from the reference-mode state into a master-mode state;
the EDC chip samples and calculates an electric signal after ROSA photoelectric conversion of the optical receive sub-assembly based on a calibration algorithm of the EDC chip in a reference-mode state to obtain optimized configuration parameters, updates a register in the EDC chip based on the configuration parameters, and performs dispersion compensation on the electric signal after ROSA photoelectric conversion of the optical receive sub-assembly based on a dispersion compensation algorithm of the EDC chip in a master-mode state through an updated register configuration value
Further, the state of the thermoelectric cooler TEC is monitored in real time, and the EDC chip is initialized after the thermoelectric cooler TEC is stabilized.
The invention has the following beneficial effects:
besides the functions of the conventional 25G DWDM product, the invention is internally provided with a signal sampling analysis unit in a receiving part, and through calculation and optimization, the received light is subjected to dispersion compensation by a certain algorithm, so that the transmission distance of the module is prolonged, and the module is prolonged from the conventional 10KM to 20KM, even 30 KM. The EDC design circuit can compensate the dispersion tolerance of the optical fiber by means of a certain algorithm, the traditional method cannot adapt to various practical application occasions by means of fixed parameter configuration, software can only optimize on the basis of hardware, the method of real-time calibration can not only calibrate parameters according to different application occasions to achieve optimal parameter configuration, but also save fussy software calculation and improve the adaptability of the system.
Drawings
FIG. 1 is a flowchart of a method for calibrating a received signal in real time with EDC functionality according to an embodiment of the invention;
fig. 2 is a schematic diagram of a portion of EDC of an optical module with EDC function and capable of calibrating a received signal in real time according to an embodiment of the present invention;
fig. 3-7 are partial views of portions of the principle shown in fig. 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, as a second embodiment of the present invention, there is provided a method of calibrating a received signal with an EDC function in real time, the method including:
and 2, the EDC chip samples and analyzes the electric signal subjected to the photoelectric conversion of the ROSA of the optical receiving subassembly under the control of the MCU unit, and obtains dispersion compensation parameters through calculation and optimizes the dispersion compensation parameters.
As a second embodiment of the present invention, an optical module with an EDC function and capable of calibrating a received signal in real time is further provided, where the optical module includes an optical receiving unit, an MCU unit, and an EDC chip;
the optical receiving unit is used for receiving an optical signal and converting the optical signal into a corresponding electrical signal through an optical receiving subassembly ROSA;
the MCU unit is used for continuously monitoring the light power of the light signal received by the light receiving unit, and controlling the working state of the EDC chip when the light power is monitored to be greater than the set minimum calibration value;
and the EDC chip is used for carrying out dispersion compensation on the electric signal subjected to the photoelectric conversion of the optical receiver subassembly ROSA under the control of the MCU unit.
The optical module with the EDC function and capable of calibrating the received signal in real time according to the embodiment of the present invention first waits for the temperature of the module TEC to be stable before the optical module is in the working mode, after the temperature of the TEC is stable, the MCU unit initializes the module and completes reset and initialization of the EDC chip, the optical module sends a stable optical signal with a set wavelength, the TOSA devices of different channels correspond to different wavelengths, the quality of the transmission eye diagram of the module is adjusted by setting the relevant register values of Vea, Ibias, and LDR, and the wavelength is adjusted to an accurate value by the thermoelectric cooler TEC. After the EDC chip enters the reference-mode, the MCU starts to monitor the received optical power, and if the received optical power is greater than the set minimum calibration value (the minimum calibration value is generally set to-25 dBm, which can be adjusted and set according to actual conditions), the EDC chip starts to perform automatic calibration. In the calibration process, the program algorithm supports the EDC chip to perform cyclic sampling analysis on the received electric signal eye diagram, and according to the signal point distribution condition of the sampled part, after calculation, relevant parameters of initialization configuration are modified to optimize the electric eye diagram, so that the purpose of compensating signal distortion caused by dispersion is achieved. After the calibration is completed, the MCU unit converts the state of the EDC chip from reference-mode to master-mode, so that the EDC chip enters a normal working mode.
And when the received optical power is smaller than the set minimum calibration value, the EDC chip exits the working mode, and when the MCU monitors that the optical power is larger than the set minimum calibration value, the MCU initializes the EDC chip again and repeats the dispersion compensation operation.
The optical module with the EDC function and capable of calibrating received signals in real time comprises an optical transceiving function of a conventional DWDM module, can support industrial working temperature of-40-85 ℃, when the temperature is too high, the wavelength can be changed, the frequency, the efficiency and the length can be reduced, at the moment, a laser needs to keep a specified signal and data rate through active cooling and temperature control, a thermoelectric cooler TEC is the only cooling technology capable of realizing the required cooling degree and precision of an optical component, a singlechip is regulated according to the comparison between a DAC value fed back by a TOSA and a DAC value set in an MCU, so that heating or cooling is selected, real-time parameter calibration can be carried out on optical signals received in different occasions to achieve optimal parameter configuration, the sensitivity index of the module is improved, the adaptability of the system to different use environments is improved, and self-receiving tests can be carried out, the wavelength of the transmitted optical signal is 1528.77 nm-1563.05 nm, 43 channels are selectable, the optical power is 0-5 dBm, the speed is 25.78Gb/s, the optical signal can be applied to scenes such as a data center and 5G forward transmission, the requirements of an electrical interface of an SFF-8431 protocol are met, hot plugging can be supported, and the size is small; the module structure size requirement of an SFF-8432 protocol is met, the DDM (digital diagnostic monitoring) requirement of the SFF-8472 protocol is met, a user is allowed to access the operation parameters of the module in real time, the optical fiber transmission distance of 20KM to 30KM can be supported, a conventional DWDM module can only receive 10KM optical fibers in the sensitivity requirement range, an optical module with an EDC function can perform dispersion compensation on optical signals which are subjected to dispersion after optical fiber transmission, and distorted signals are recovered to a certain degree, so that the acceptable optical fiber transmission distance of the module in the sensitivity range is prolonged.
The invention can calibrate the parameters of the optical signals received in different occasions in real time so as to achieve the optimal parameter configuration, improve the sensitivity index of the module and improve the adaptability of the system to different use environments. When an optical signal enters the module and the optical power is stable, the ROSA converts the optical signal into a stable electrical signal, the EDC chip starts to calibrate the received electrical signal, a calibration algorithm can change some registers in the EDC chip, the algorithm can search for the optimal configuration parameters for 256 × 128 × 8 times through cyclic sampling calculation, and the optical signal subjected to dispersion is compensated to a certain degree through the calibrated configuration parameters, so that the purpose of optimizing the sensitivity is achieved.
Referring to fig. 2 to 7, when designing a schematic diagram related to an EDC part of an optical module having an EDC function and capable of calibrating a received signal in real time according to an embodiment of the present invention, an external crystal oscillator capable of providing a clock frequency of 644.53125MHz is required, and a ROSA selected is a LinearAPD ROSA.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An optical module with an EDC function and capable of calibrating a received signal in real time is characterized by comprising an optical receiving unit, an MCU (microprogrammed control unit) and an EDC chip;
the optical receiving unit is used for processing the received optical signal and converting the optical signal into a corresponding electrical signal through an optical receiving subassembly ROSA;
the MCU unit is used for continuously monitoring the light power of the light signal received by the light receiving unit, and controlling the working state of the EDC chip when the light power is monitored to be greater than the set minimum calibration value;
and the EDC chip is used for sampling and analyzing the electric signal subjected to the photoelectric conversion of the optical receiver subassembly ROSA under the control of the MCU unit and performing dispersion compensation according to an analysis result.
2. The optical module with EDC function capable of calibrating a received signal in real time according to claim 1, wherein the EDC chip performing dispersion compensation on the electrical signal after optical-to-electrical conversion by the ROSA under control of the MCU specifically includes:
analyzing and processing the electric signal after the photoelectric conversion of the ROSA of the optical receiving subassembly based on a signal processing unit of the EDC chip to obtain new configuration parameters, and updating a register in the EDC chip based on the new configuration parameters;
and performing dispersion compensation on the electric signal subjected to photoelectric conversion of the optical receiver subassembly ROSA based on a self dispersion compensation algorithm through the updated register configuration value.
3. The optical module with EDC function capable of calibrating a received signal in real time as claimed in claim 1,
the EDC chip is also used for optimizing and adjusting the configuration parameters after dispersion compensation so as to minimize calculation errors.
4. The optical module with EDC function capable of calibrating a received signal in real time according to claim 2, wherein the MCU unit is specifically configured to: when the monitored optical power is larger than the set minimum calibration value, controlling the EDC chip to initialize, loading the default initial register configuration value into the EDC chip, so that the EDC chip enters a reference-mode state, completing the calibration of the EDC chip and updating the register configuration value, and after optimizing the register configuration value, controlling the EDC chip to be converted from the reference-mode state into a master-mode state;
the EDC chip calibrates the electric signal after the ROSA photoelectric conversion of the optical receive sub-assembly based on the calibration algorithm of the EDC chip in a reference-mode state to obtain optimized configuration parameters, updates a register in the EDC chip based on the configuration parameters, and performs dispersion compensation on the electric signal after the ROSA photoelectric conversion of the optical receive sub-assembly based on the dispersion compensation algorithm of the EDC chip in a master-mode state through the updated register configuration value.
5. The optical module with EDC function and capable of calibrating a received signal in real time as claimed in claim 1, wherein the MCU unit is further configured to monitor the state of the thermoelectric cooler TEC, and control the operating state of the EDC chip only after the thermoelectric cooler TEC is stabilized.
6. The optical module with EDC function capable of calibrating a received signal in real time as claimed in claim 1, wherein the ROSA is a Linear ROSA.
7. A method for calibrating a received signal in real time with EDC functionality, the method comprising:
step 1, the MCU unit continuously monitors the light power of the light signal received by the light receiving unit, and when the light power is monitored to be larger than a set minimum calibration value, the working state of the EDC chip is controlled;
and 2, the EDC chip performs sampling analysis calculation on the electric signal subjected to the photoelectric conversion of the ROSA under the control of the MCU unit, and performs dispersion compensation according to an algorithm.
8. The method of claim 7, wherein the EDC chip, under the control of the MCU, performs dispersion compensation on the electrical signal after optical-to-electrical conversion by the ROSA, and specifically comprises:
analyzing and processing an electric signal subjected to ROSA photoelectric conversion of the optical receiving subassembly based on a signal processing unit of the EDC chip to obtain optimized configuration parameters, and updating a register in the EDC chip based on the configuration parameters;
and performing dispersion compensation on the electric signal subjected to photoelectric conversion of the optical receiver subassembly ROSA based on a self dispersion compensation algorithm through the updated register configuration value.
9. The method of claim 8, wherein the MCU controls the EDC chip to operate in a state of: when the monitored optical power is larger than the set minimum calibration value, controlling the EDC chip to initialize, loading the default initial register configuration value into the EDC chip, so that the EDC chip enters a reference-mode state, and after the EDC chip is calibrated and the register configuration value is updated, controlling the EDC chip to be converted from the reference-mode state into a master-mode state;
the EDC chip samples and analyzes the received electric signal in a reference-mode state to obtain a new configuration parameter, updates a register to the new configuration parameter according to the obtained new configuration parameter, optimizes the received signal in the new configuration parameter, and performs dispersion compensation on the electric signal after the photoelectric conversion of the optical receive sub-assembly ROSA in a master-mode state through the updated register configuration value based on a self dispersion compensation algorithm after the completion.
10. The method of claim 7, wherein the state of the thermoelectric cooler TEC is monitored in real time, and the EDC chip is initialized after the thermoelectric cooler TEC is stabilized.
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