CN210518344U - 100G-QSFP28 optical transmission module based on PAM4 - Google Patents
100G-QSFP28 optical transmission module based on PAM4 Download PDFInfo
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Abstract
The utility model relates to an optical fiber communication technology field, in particular to a 100G-QSFP28 optical transmission module based on PAM4, which adopts QSFP28 encapsulation and comprises a data transmission conversion unit, a data receiving conversion unit and a control monitoring unit; the data transmission conversion unit converts four paths of 25Gb/s electrical signals output by the user interface into two paths of 50Gb/s PAM4 optical signals, and then synthesizes one path of optical signals for output; the data receiving and converting unit reduces one path of received optical signals into two paths of single-wavelength optical signals, converts the two paths of single-wavelength optical signals into four paths of 25Gb/s electrical signals and outputs the four paths of single-wavelength optical signals to a user interface; the control monitoring unit maintains the normal work of each functional unit in the module. The utility model discloses utilize the advantage of PAM4 signal in the aspect of high-speed transmission, realized the effective transmission of 100Gb/s signal on optic fibre, adopt QSFP28 encapsulation to guarantee the miniaturization of 100G optical module device, be favorable to improving the integrated level.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to an optical fiber communication technology field, concretely relates to 100G-QSFP28 optical transmission module based on PAM 4.
[ background of the invention ]
With the continuous progress of internet data services and the like, the demand for bandwidth is continuously increased, and the updating and upgrading of the optical transmission module are also carried out steadily. In a conventional 100G optical transmission module, Non-Return-to-Zero (NRZ) signals are mainly based on NRZ signals, but the transmission speed based on NRZ signals is slow, and along with the increase of transmission rate, the optical module based on the conventional NRZ signals has a complex structure and high cost. Meanwhile, with the development of the 5G technology, the density of the panels of the large-scale data center is higher, so that higher requirements are placed on the integration level of the optical module, and higher requirements are placed on the cost and the stability of the optical module. At present, a 100G optical transmission module is usually packaged by Ceramic Flat Packaging (CFP) or CFP2, and the package volume is large, and the port density is limited, so that the requirement of a 100G optical module with a small package volume is difficult to meet.
In view of the above, it is an urgent problem in the art to overcome the above-mentioned drawbacks of the prior art.
[ Utility model ] content
The utility model discloses the technical problem that needs to solve is:
in a conventional optical transmission module, the transmission speed based on NRZ signals is slow, which affects the effective transmission of 100Gb/s rate signals on optical fibers, and a 100G optical transmission module is usually packaged by CFP or CFP2, which has a large volume and limits port density, and is difficult to meet the requirement of a 100G optical module with a small package volume.
The utility model discloses a following technical scheme reaches above-mentioned purpose:
the utility model provides a 100G-QSFP28 optical transmission module based on PAM4, the optical transmission module adopts QSFP28 encapsulation, including data transmission converting unit, data reception converting unit and control monitoring unit; the input end of the data sending conversion unit is connected with a user interface, the output end of the data receiving conversion unit is connected with the user interface, and the input end and the output end of the control monitoring unit are respectively connected with the user interface;
the data sending and converting unit is used for synthesizing and converting four paths of 25Gb/s NRZ electric signals output by the user interface into two paths of 50Gb/s PAM4 optical signals, and then synthesizing one path of optical signals and outputting the optical signals;
the data receiving and converting unit is used for reducing the received one path of optical signal into two paths of single-wavelength optical signals, converting the two paths of single-wavelength optical signals into four paths of NRZ electrical signals with 25Gb/s, and outputting the four paths of NRZ electrical signals to the user interface;
the control monitoring unit is used for realizing the interaction of all information in the optical transmission module so as to facilitate the user management, and simultaneously realizing the control and monitoring of all functional units in the optical transmission module so as to ensure that the optical transmission module works in a preset working state.
Preferably, the data sending and converting unit comprises a PAM4 codec device, two driving amplifiers, two light emitting assemblies and an optical multiplexer which are connected in sequence; wherein, the input end of the PAM4 codec device is connected with the user interface;
the PAM4 encoding and decoding device is used for converting four paths of 25Gb/s NRZ electric signals output by the user interface into two paths of 50Gb/s PAM4 electric signals in real time and transmitting the two paths of electric signals to the two driving amplifiers;
the two driving amplifiers are used for amplifying the two paths of received electric signals and transmitting the two paths of amplified electric signals to the two light emitting assemblies;
the two optical transmitting assemblies are used for converting the two paths of received electric signals into two paths of optical signals and transmitting the two paths of optical signals to the optical multiplexer;
and the optical multiplexer is used for synthesizing the two received optical signals into one optical signal and outputting the optical signal.
Preferably, in the light emitting module, an EML laser is used to convert the received electrical signal into an optical signal.
Preferably, in the optical multiplexer, the CWDM is adopted to combine the two optical signals into one optical signal.
Preferably, the wavelength interval of the two optical signals is 4nm-6 nm.
Preferably, the data receiving and converting unit comprises a demultiplexer, two light receiving components and a PAM4 codec device which are connected in sequence;
the input end of the demultiplexer is connected with the output end of the optical multiplexer, the output end of the PAM4 codec device is connected with the user interface, and the data transmission conversion unit and the data reception conversion unit adopt the same PAM4 codec device;
the demultiplexer is used for reducing the received one path of optical signal into two paths of single-wavelength optical signals and transmitting the two paths of single-wavelength optical signals to the two optical receiving components;
the two light receiving components are used for converting the received two paths of single-wavelength light signals into two paths of electric signals and transmitting the two paths of electric signals to the PAM4 encoding and decoding device;
the PAM4 codec device is used for converting the two received electrical signals into four paths of NRZ electrical signals with 25Gb/s and outputting the four paths of NRZ electrical signals with 25Gb/s to the user interface.
Preferably, the light receiving assembly includes a light detector and a transimpedance limiting amplifier which are connected in sequence, an input end of the light detector is connected with the demultiplexer, and an output end of the transimpedance limiting amplifier is connected with the PAM4 codec;
the optical detector is used for converting the received optical signal into photocurrent and transmitting the photocurrent to the trans-impedance limiting amplifier; the trans-impedance limiting amplifier is used for converting the received photocurrent into a voltage signal and transmitting the voltage signal to the PAM4 codec device.
Preferably, in the light receiving module, the photodetector employs an avalanche photodiode.
Preferably, an optical connector is further arranged between the data sending conversion unit and the data receiving conversion unit; the input end of the optical connector is connected with the output end of the optical multiplexer, and the output end of the optical connector is connected with the input end of the demultiplexer.
Preferably, the user interface is a 38-pin connector.
The utility model has the advantages that:
the utility model provides an among the optical transmission module, utilize PAM4 signal for the advantage in the aspect of the NRZ signal high-speed transmission, realized the effective transmission of 100Gb/s signal on the optic fibre; the QSFP28 is adopted for packaging, the whole packaging volume is only one third to one half of that of the traditional CFP/CFP2 packaged 100G optical module, the port density is higher, the miniaturization of the 100G optical module device is ensured, the integration level is improved, and the requirements of a high-level data center or a base station are met.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a block diagram illustrating a structure of a 100G-QSFP28 optical transmission module based on PAM4 according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a 100G-QSFP28 optical transmission module based on PAM4 according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another 100G-QSFP28 optical transmission module based on PAM4 according to an embodiment of the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "up", "down", "top", "bottom", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the embodiments of the present invention, the symbol "/" indicates that two functions are simultaneously provided, and the symbol "a and/or B" indicates that the combination between the front and rear objects connected by the symbol includes three cases "a", "B", "a, and B".
Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be described in detail with reference to the accompanying drawings and examples.
Considering that compared with the conventional NRZ signal, the four-Pulse Amplitude Modulation (PAM 4 for short) mode can transmit data twice as high as the NRZ signal at the same baud rate, and doubles the transmission speed of the optical module without changing the system. Therefore, in order to overcome the difficulty that traditional NRZ standard transmission high speed signal met, the utility model discloses a synthesize the relatively higher scheme of PAM4 signal of four ways relatively lower speed with the NRZ signal of four ways and carry out the transmission to PAM4 replaces NRZ and is applied to optical transmission module, provides a 100G-QSFP28 optical transmission module based on PAM 4.
As shown in fig. 1, the embodiment of the present invention provides an optical transmission module which adopts a QSFP28 package in a quad small Form-factor plug (QSFP) package, and the optical transmission module includes a data transmission conversion unit, a data reception conversion unit and a control monitoring unit. The input end of the data sending conversion unit is connected with a user interface, the output end of the data receiving conversion unit is connected with the user interface, and the input end and the output end of the control monitoring unit are respectively connected with the user interface. The functions of each part are as follows:
the data sending and converting unit is used for synthesizing and converting four paths of 25Gb/s NRZ electric signals output by the user interface into two paths of 50Gb/s PAM4 optical signals, and then synthesizing one path of optical signals and outputting the optical signals;
the data receiving and converting unit is used for reducing the received one path of optical signal into two paths of single-wavelength optical signals, converting the two paths of single-wavelength optical signals into four paths of NRZ electrical signals with 25Gb/s, and outputting the four paths of NRZ electrical signals to the user interface;
the control monitoring unit is used for maintaining the normal work of the optical transmission module, and specifically comprises two parts: firstly, the interaction of all information in the optical transmission module is realized, so that a user can manage the optical transmission module conveniently; secondly, the control and monitoring of each functional unit in the optical transmission module are realized through a microcontroller in the module, so that the optical transmission module works in a preset working state, namely a working state set by a user.
The functional parts (such as internal electronic chips) adopt components with high integration level and mature production process, can be produced and purchased in large scale, are favorable for reducing cost and ensuring the requirement of integration level, and are suitable for possible large-scale purchase, installation and use in the future.
The embodiment of the utility model provides an among the above-mentioned optical transmission module, utilize PAM4 signal for the advantage in the aspect of the NRZ signal high-speed transmission, realized the effective transmission of 100Gb/s signal on the optic fibre; the QSFP28 is adopted for packaging, the whole packaging volume is only one third to one half of that of the traditional CFP/CFP2 packaged 100G optical module, the port density is higher, the miniaturization of the 100G optical module device is ensured, the integration level is improved, and the requirements of a high-level data center or a base station are met.
In a specific embodiment, the overall structure of the optical transmission module is as shown in fig. 2. The user interface adopts a 38-PIN CONNECTOR (namely 38PIN CONNECTOR), and the Control monitoring unit (namely Alarm/Control/Monitor) is connected with the user interface 38PIN CONNECTOR so as to support the normal work of each subassembly.
With continued reference to fig. 2, the data transmission conversion unit includes a PAM4 codec device, two Driver amplifiers (i.e., Driver 11 and Driver12 in the figure), two optical transmission assemblies (i.e., TOSA 21 and TOSA 22 in the figure), and an optical multiplexer (i.e., Mux) connected in sequence; wherein, the input end of the PAM4 codec is connected with the user interface 38 PINCONNECTOR. In the data transmission conversion unit, the data transmission conversion process specifically includes:
the PAM4 codec device converts four paths of NRZ electrical signals (namely TX0, TX1, TX2 and TX3 in the figure) with 25Gb/s rate output by the user interface 38PIN CONNECTOR into two paths of 50Gb/s PAM4 electrical signals in real time, completes functions of data equalization, jitter control and the like, and then transmits the two paths of electrical signals to the two driving amplifiers Driver 11 and Driver 12; the two driving amplifiers amplify the two received electric signals and transmit the two amplified electric signals to the two light emitting assemblies TOSA 21 and TOSA 22; the two optical transmitting assemblies convert the two paths of received electric signals into two paths of optical signals by using internal lasers and transmit the two paths of optical signals to the optical multiplexer Mux; the optical multiplexer Mux synthesizes the two received optical signals into one optical signal and outputs the optical signal, thereby realizing data transmission on an optical fiber line of an optical network. In the optical multiplexer Mux, a Coarse Wavelength Division Multiplexing (CWDM) technique is used to synthesize two optical signals into one optical signal, where the Wavelength interval of the two optical signals is 4nm to 6nm, and usually 5 nm.
With continued reference to fig. 2, the data reception conversion unit includes a demultiplexer (i.e., Demux in the figure), two optical reception components (i.e., ROSA 31 and ROSA 32 in the figure), and a PAM4 codec device, which are connected in sequence. The input end of the demultiplexer Demux is connected with the output end of the optical multiplexer Mux, the output end of the PAM4 codec device is connected with the user interface 38PIN CONNECTOR, and the data sending conversion unit and the data receiving conversion unit adopt the same PAM4 codec device. In the data receiving and converting unit, the data receiving and converting process specifically includes:
the demultiplexer Demux restores the received one path of CWDM optical signal into two paths of single-wavelength optical signals and transmits the two paths of single-wavelength optical signals to the two optical receiving components ROSA 31 and ROSA 32; the two light receiving components convert the received two paths of single-wavelength light signals into two paths of electric signals and transmit the two paths of electric signals to the PAM4 encoding and decoding device; the PAM4 codec device converts the two received electrical signals into four 25Gb/s NRZ electrical signals (namely RX0, RX1, RX2 and RX3 in the figure), realizes the functions of clock data recovery, signal conditioning and the like, and then outputs the four 25Gb/s NRZ electrical signals to the user interface 38PIN CONNECTOR. Thus, the loop back function in the optical transmission module is completed.
The optical receiver assembly ROSA comprises a light detector and a transimpedance limiting amplifier which are sequentially connected, the input end of the light detector is connected with the demultiplexer Demux, and the output end of the transimpedance limiting amplifier is connected with the PAM4 codec device. An optical signal reaching an optical receiving assembly ROSA firstly enters the optical detector, the optical detector converts the received optical signal into a photocurrent according to the intensity of light and transmits the photocurrent to the transimpedance limiting amplifier; the trans-impedance limiting amplifier converts the received photocurrent into a voltage signal and amplifies the voltage signal, and then transmits the voltage signal after conversion and amplification to the PAM4 codec device.
Because PAM4 standard transmission is susceptible to interference and generates error codes, the transmission distance of an optical transmission module based on PAM4 is mostly below 10km, and normal communication of medium-long distance PAM4 signals is difficult to realize. In order to obtain better signal quality and realize stable transmission over medium and long distances, in the optical transmitter module TOSA of the data transmission and conversion unit, an electro-absorption Modulated Laser (EML) is used to convert a received electrical signal into an optical signal. Compare direct Modulated Laser (DML for short), the EML Laser has better bandwidth to obtain better signal quality, consequently adopt PAM4 standard signal also can satisfy the demand of medium and long transmission, also more mature in the technique moreover, the requirement of QSFP encapsulation can also be satisfied in the global design. In addition, if the photodetector in the optical receiver assembly ROSA employs an Avalanche Photodiode (APD), the transmission distance of the entire optical transmission module may reach a long distance of 40 km.
In another specific embodiment, the overall structure of the optical transmission module is as shown in fig. 3. On the basis of the Optical transmission module provided in fig. 2, an Optical Connector (i.e., an Optical Connector in the figure) is further disposed between the data transmission conversion unit and the data reception conversion unit; the input end of the Optical Connector is connected with the output end of the Optical multiplexer Mux, and the output end of the Optical Connector is connected with the input end of the demultiplexer Demux; the rest of the structures are the same as the embodiment described in fig. 2, and are not described herein. Based on the optical transmission module in fig. 3, the process of data transmission conversion and data reception conversion is specifically as follows:
the PAM4 codec device converts four paths of NRZ electrical signals (namely TX0, TX1, TX2 and TX3 in the figure) with 25Gb/s rate output by the user interface 38PIN CONNECTOR into two paths of 50Gb/s PAM4 electrical signals in real time, completes functions of data equalization, jitter control and the like, and then transmits the two paths of electrical signals to the two driving amplifiers Driver 11 and Driver 12; the two driving amplifiers amplify the two received electric signals and transmit the two amplified electric signals to the two light emitting assemblies TOSA 21 and TOSA 22; the two optical emission assemblies convert the two paths of received electric signals into two paths of optical signals by using an internal EML laser and transmit the two paths of received electric signals to the optical multiplexer Mux; the optical multiplexer Mux synthesizes the two received optical signals into one CWDM optical signal and outputs the one CWDM optical signal to the optical connector, thereby realizing data transmission on an optical fiber line of an optical network.
The Optical Connector transmits the received one path of CWDM Optical signal to the demultiplexer Demux, the demultiplexer Demux restores the received one path of CWDM Optical signal into two paths of single-wavelength Optical signals, and transmits the two paths of single-wavelength Optical signals to the two Optical receiving components ROSA 31 and ROSA 32; the two light receiving components convert the received two paths of single-wavelength light signals into two paths of electric signals and transmit the two paths of electric signals to the PAM4 encoding and decoding device; the PAM4 codec device converts the two received electrical signals into four 25Gb/s NRZ electrical signals (namely RX0, RX1, RX2 and RX3 in the figure), realizes the functions of clock data recovery, signal conditioning and the like, and then outputs the four 25Gb/s NRZ electrical signals to the user interface 38PIN CONNECTOR. Thus, the loop back function in the optical transmission module is completed.
In summary, the embodiment of the present invention provides a 100G-QSFP28 optical transmission module with the following advantages:
the advantages of PAM4 signals in high-speed transmission relative to NRZ signals and the characteristics of mature technology and excellent signal quality of an EML laser are utilized to realize stable and effective transmission of 100Gb/s signals on medium-and-long-distance optical fibers;
the QSFP28 is adopted for packaging, the whole packaging volume is only one third to one half of that of the traditional CFP/CFP2 packaged 100G optical module, the port density is higher, the miniaturization of the 100G optical module device is ensured, the integration level is improved, and the requirements of a high-level data center or a base station are met;
the used chip and device are all products with mature technical process, can be produced and purchased in large scale, are beneficial to reducing the cost, and are suitable for possible large-scale purchase, installation and use in the future.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A100G-QSFP 28 optical transmission module based on PAM4 is characterized in that the optical transmission module is packaged by QSFP28 and comprises a data transmission conversion unit, a data receiving conversion unit and a control monitoring unit; the input end of the data sending conversion unit is connected with a user interface, the output end of the data receiving conversion unit is connected with the user interface, and the input end and the output end of the control monitoring unit are respectively connected with the user interface;
the data sending and converting unit is used for synthesizing and converting four paths of 25Gb/s NRZ electric signals output by the user interface into two paths of 50Gb/s PAM4 optical signals, and then synthesizing one path of optical signals and outputting the optical signals;
the data receiving and converting unit is used for reducing the received one path of optical signal into two paths of single-wavelength optical signals, converting the two paths of single-wavelength optical signals into four paths of NRZ electrical signals with 25Gb/s, and outputting the four paths of NRZ electrical signals to the user interface;
the control monitoring unit is used for realizing the interaction of all information in the optical transmission module so as to facilitate the user management, and simultaneously realizing the control and monitoring of all functional units in the optical transmission module so as to ensure that the optical transmission module works in a preset working state.
2. The PAM 4-based 100G-QSFP28 optical transmission module according to claim 1, wherein the data transmission conversion unit comprises a PAM4 codec device, two driving amplifiers, two optical transmission components and an optical multiplexer which are connected in sequence; wherein, the input end of the PAM4 codec device is connected with the user interface;
the PAM4 encoding and decoding device is used for converting four paths of 25Gb/s NRZ electric signals output by the user interface into two paths of 50Gb/s PAM4 electric signals in real time and transmitting the two paths of electric signals to the two driving amplifiers;
the two driving amplifiers are used for amplifying the two paths of received electric signals and transmitting the two paths of amplified electric signals to the two light emitting assemblies;
the two optical transmitting assemblies are used for converting the two paths of received electric signals into two paths of optical signals and transmitting the two paths of optical signals to the optical multiplexer;
and the optical multiplexer is used for synthesizing the two received optical signals into one optical signal and outputting the optical signal.
3. The PAM4 based 100G-QSFP28 optical transmission module of claim 2 wherein an EML laser is employed in the optical transmission assembly to convert received electrical signals to optical signals.
4. The PAM 4-based 100G-QSFP28 optical transmission module of claim 2, wherein in the optical multiplexer, a CWDM is used to combine two optical signals into one optical signal.
5. The PAM 4-based 100G-QSFP28 optical transmission module of claim 4, wherein the wavelength interval of the two optical signals is 4nm-6 nm.
6. The PAM 4-based 100G-QSFP28 optical transmission module according to claim 2, wherein the data receiving conversion unit comprises a demultiplexer, two optical receiving components and a PAM4 codec device which are connected in sequence;
the input end of the demultiplexer is connected with the output end of the optical multiplexer, the output end of the PAM4 codec device is connected with the user interface, and the data transmission conversion unit and the data reception conversion unit adopt the same PAM4 codec device;
the demultiplexer is used for reducing the received one path of optical signal into two paths of single-wavelength optical signals and transmitting the two paths of single-wavelength optical signals to the two optical receiving components;
the two light receiving components are used for converting the received two paths of single-wavelength light signals into two paths of electric signals and transmitting the two paths of electric signals to the PAM4 encoding and decoding device;
the PAM4 codec device is used for converting the two received electrical signals into four paths of NRZ electrical signals with 25Gb/s and outputting the four paths of NRZ electrical signals with 25Gb/s to the user interface.
7. The PAM 4-based 100G-QSFP28 optical transmission module of claim 6, wherein the optical receiving component comprises a photodetector and a transimpedance limiting amplifier which are connected in sequence, the input end of the photodetector is connected with the demultiplexer, and the output end of the transimpedance limiting amplifier is connected with the PAM4 codec device;
the optical detector is used for converting the received optical signal into photocurrent and transmitting the photocurrent to the trans-impedance limiting amplifier; the trans-impedance limiting amplifier is used for converting the received photocurrent into a voltage signal and transmitting the voltage signal to the PAM4 codec device.
8. The PAM4 based 100G-QSFP28 optical transmission module of claim 7 wherein the photodetector comprises an avalanche photodiode in the light receiving assembly.
9. The PAM 4-based 100G-QSFP28 optical transmission module as claimed in claim 6, wherein an optical connector is further provided between the data transmission conversion unit and the data reception conversion unit; the input end of the optical connector is connected with the output end of the optical multiplexer, and the output end of the optical connector is connected with the input end of the demultiplexer.
10. The PAM 4-based 100G-QSFP28 optical transmission module of any of claims 1-9, wherein the user interface employs a 38pin connector.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050865A (en) * | 2021-10-13 | 2022-02-15 | 武汉光迅科技股份有限公司 | Data transmission device, chip and electronic equipment |
| CN114285476A (en) * | 2021-11-24 | 2022-04-05 | 武汉永鼎光通科技有限公司 | Single-channel wavelength division optical module |
| CN114944973A (en) * | 2022-07-25 | 2022-08-26 | 苏州联讯仪器有限公司 | Clock signal recovery method and system |
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2019
- 2019-09-20 CN CN201921567790.6U patent/CN210518344U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114050865A (en) * | 2021-10-13 | 2022-02-15 | 武汉光迅科技股份有限公司 | Data transmission device, chip and electronic equipment |
| CN114285476A (en) * | 2021-11-24 | 2022-04-05 | 武汉永鼎光通科技有限公司 | Single-channel wavelength division optical module |
| CN114944973A (en) * | 2022-07-25 | 2022-08-26 | 苏州联讯仪器有限公司 | Clock signal recovery method and system |
| CN114944973B (en) * | 2022-07-25 | 2022-11-01 | 苏州联讯仪器有限公司 | Clock signal recovery method and system |
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