Time synchronization signal hybrid coding device and method in burst type optical fiber ring network

Abstract

The invention relates to a time synchronization signal hybrid coding device and method in a burst type optical fiber looped network, which are realized based on time frequency reference equipment with a serial cascade optical fiber looped network architecture, are limited by the maximum working frequency of devices, and aim to improve the time synchronization precision among the equipment and simultaneously ensure information interaction based on digital communication among the equipment. In combination with the characteristic that the time reference height of equipment in the ring network is consistent, analog information and digital information transmitted in the optical fiber ring network are subjected to hybrid coding by adopting a time division multiplexing coding mode, and meanwhile, the data throughput and the time synchronization precision between the equipment are ensured. The method has the advantages that the number of optical fiber links is reduced, analog and digital data links are managed in a unified mode, implementation is easy, and the like, and the time sequence control problem of time-frequency reference equipment in the analog and digital signal transmission process under the optical fiber ring network architecture can be solved; the consistency of time service information output by the time-frequency reference equipment in the optical fiber ring network architecture can be improved to a great extent, and meanwhile, the management efficiency of the ring network equipment is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of time-frequency transmission, and in particular to a device and method for hybrid encoding of time synchronization signals in a burst optical fiber ring network. Background Art

[0002] At present, the time and frequency reference equipment based on the serial cascade fiber optic ring network architecture consists of a host and extensions. The host and extensions communicate through the fiber optic ring network. Due to the maximum operating frequency of the device and the limited digital time resolution, the master and extensions will lose synchronization accuracy when using digital time synchronization. Therefore, the fiber optic ring communication data contains both serial digital quantities and analog signals that indicate the "on time" moment with the rising edge of the second pulse. In order to meet the synchronization accuracy and usage requirements between devices, a burst optoelectronic conversion module must be used to establish a fiber optic ring network. At the same time, a specific hybrid encoding method is required to plan the timing of transmitting analog and digital signals in the fiber optic ring network to ensure the consistency of the timing information output by the host and extension, while not affecting the host's management efficiency of all devices in the ring network. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a hybrid encoding device and method for time synchronization signals in a burst-type optical fiber ring network, which has the advantages of saving the number of optical fiber links, unified management of analog and digital data links, and easy implementation. It can solve the timing control problem of the analog and digital signal transmission process of the time and frequency reference device under the optical fiber ring network architecture, and can greatly improve the consistency of the timing information output by the time and frequency reference device based on the optical fiber ring network architecture, while improving the management efficiency of the ring network equipment.

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] A time synchronization signal hybrid encoding device in a burst optical fiber ring network comprises a host and multiple extensions, wherein the host and the multiple extensions are connected end to end in a series manner inside the optical fiber ring network to form a ring network; the host sends time and frequency reference information through the ring network, and the extension receives and synchronizes the host time and frequency reference information, and at the same time forwards the host information to the extension of the next level until it returns to the host, completing a closed loop; the extension synchronizes the analog time and frequency information sent by the host in the optical fiber link to establish a local time reference, reports its own working status in the form of a serial digital signal, receives host control information, and establishes a ring-structured optical fiber synchronization network through analog and digital data links.

[0006] Moreover, the host includes: a time synchronization unit, a burst photoelectric conversion unit, a hybrid decoding unit, a core control unit, a hybrid coding unit and a frequency reference unit, wherein the frequency reference unit is respectively connected to the time synchronization unit, the core control unit and the hybrid coding unit, the core control unit is respectively connected to the time synchronization unit, the burst photoelectric conversion unit, the hybrid decoding unit and the hybrid coding unit, and the burst photoelectric conversion unit is connected to the hybrid decoding unit.

[0007] Moreover, the extension includes: a time synchronization unit, a burst photoelectric conversion unit, a hybrid decoding unit, a core control unit, a hybrid coding unit and a frequency reference unit, wherein the frequency reference unit is respectively connected to the time synchronization unit, the core control unit and the hybrid coding unit, the core control unit is respectively connected to the time synchronization unit, the burst photoelectric conversion unit and the hybrid coding unit, and the hybrid decoding unit is respectively connected to the time synchronization unit and the burst photoelectric conversion unit.

[0008] Moreover, the mixed code rate compiled by the mixed coding unit is once per second; the mixed code divides different time periods within one second into different code areas according to the device number. After the device in the ring network completes time synchronization, it adds its own coding information in the fixed code area, and reserves interval areas between the code areas to avoid the synchronization error caused by link delay accumulating into the coding process and causing code area coverage.

[0009] Moreover, the coded information includes three parts: the header is a leading code and an analog second pulse signal, the middle part is a device status code, and the tail part is a device control word code. Except for the analog second pulse signal, the rest are digital signals. The leading code format is fixed to ten bytes, including a header, device working status, device number and checksum. The local time is maintained by the counting frequency of the core control unit. Therefore, the leading code is output in advance before the arrival of the analog second pulse signal, indicating that the analog second pulse signal is about to arrive for the hybrid decoding unit to parse; in order to match the serial interface logic, the "on time" moment represented by the analog second pulse signal is characterized by a falling edge. After the falling edge arrives, the low level continues for a period of time, indicating that the second pulse signal has been sent. The remaining part of the code area is filled with the device status code and the control word code. These two parts also include a header, a data segment and a checksum.

[0010] Moreover, the hybrid decoding unit of the host is used to obtain the fiber optic link delay by decoding the second pulse signal in the extension coding area and comparing it with the local reference signal, and use this data to control the extension to perform output compensation. At the same time, the working status coding information reported by the extension after the host decodes is summarized and displayed on the interactive interface; the hybrid decoding unit of the extension is used to decode the host time reference information from the optical fiber link, and the core control unit controls the time synchronization unit to complete the time synchronization, and adds the second pulse information, working status and control word coding information after its own synchronization to the extension coding area.

[0011] Moreover, the frequency reference unit includes a reference frequency standard and a clock fan-out circuit. The reference frequency standard is used to provide a standard frequency output. The clock fan-out circuit expands a single-channel output into multiple-channel outputs for use by other units.

[0012] Moreover, the core control unit is implemented using a processor, and the core control unit is used to drive the time synchronization unit to complete precision time synchronization, maintain the local time reference through the frequency signal of the frequency reference unit, provide an interface link between the encoding and decoding unit and the burst photoelectric conversion unit, and the host core control unit controls the extension optical fiber link delay compensation.

[0013] A hybrid coding method for a time synchronization signal hybrid coding device in a burst optical fiber ring network includes a host completing hybrid coding of analog digital signals in the burst optical fiber ring network and an extension completing hybrid coding of analog digital signals in the burst optical fiber ring network, wherein the host completing hybrid coding of analog digital signals in the burst optical fiber ring network includes the following steps:

[0014] Step 1.1, the host starts working, synchronizes the external reference second pulse signal, and uses the frequency reference unit signal to establish the ring network time reference;

[0015] Step 1.2, the time-frequency reference information, the working status information and the control word information are mixed and encoded, and after encoding, they are added to the encoding area corresponding to the device number through a burst photoelectric conversion unit;

[0016] Step 1.3, decode the synchronous second pulse signal, working status and control word information fed back by the extension, calculate the extension link compensation value and distribute it through the control word coding area, summarize the extension status and prompt the ring network status at a frequency of once per second, and end.

[0017] Moreover, the extension completes the mixed encoding of analog digital signals in the burst optical fiber ring network, including the following steps:

[0018] Step 2.1: The extension starts working, connects to the optical fiber ring network, and uses the decoding unit to analyze the host time reference information in the ring network.

[0019] Step 2.2, determine whether synchronization with the time reference in the ring network is completed. If synchronization is completed, execute step 2.3, otherwise repeat step 2.2;

[0020] Step 2.3, after the extension time is synchronized, the synchronized local time and frequency reference information, working status information, control word information, etc. are mixed and encoded, and then sent to the encoding area corresponding to the device number through the burst photoelectric conversion unit;

[0021] Step 2.4: Compensate the link delay into the local time base according to the host command, and feed back the device local time base, working status and other information to the host every second. The host will perform status summary monitoring, and the process ends.

[0022] The advantages and positive effects of the present invention are:

[0023] The present invention is implemented based on a time-frequency reference device with a serial cascade optical fiber ring network architecture. In view of the characteristics of the optical fiber data link, the time-frequency device inside the optical fiber ring network needs to exchange time-frequency information and control status data. Limited by the maximum operating frequency of the device, the digital time resolution is limited. The master and extension use digital time synchronization to lose synchronization accuracy. Therefore, in order to improve the time synchronization accuracy between devices and ensure the information interaction between devices based on digital communication, combined with the characteristics of highly consistent time references of devices in the ring network, a time-division multiplexing encoding method is adopted to mix the analog information and digital information transmitted in the optical fiber ring network, while ensuring the data throughput and time synchronization accuracy between devices. The method of the present invention has the advantages of saving the number of optical fiber links, unified management of analog and digital data links, and easy implementation. It can solve the timing control problem of the time-frequency reference device in the process of analog and digital signal transmission under the optical fiber ring network architecture, and can greatly improve the consistency of the timing information output by the time-frequency reference device in the optical fiber ring network architecture, while improving the management efficiency of the ring network equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a time synchronization signal hybrid encoding device in a burst optical fiber ring network of the present invention;

[0025] Figure 2 This is a schematic diagram of the mainframe functional unit of the present invention;

[0026] Figure 3 This is a schematic diagram of the extension function unit of the present invention;

[0027] Figure 4 It is a flowchart of the host information processing process of the present invention;

[0028] Figure 5 It is a flow chart of the extension information processing process of the present invention;

[0029] Figure 6 This is a timing diagram of hybrid coding in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings.

[0031] A time synchronization signal hybrid encoding device in a burst optical fiber ring network includes a host and multiple extensions, wherein the host and the multiple extensions are connected end to end in a series manner inside the optical fiber ring network to form a ring network; the host sends time and frequency reference information through the ring network, and the extension receives and synchronizes the host time and frequency reference information, and at the same time forwards the host information to the next-level extension until it returns to the host, completing a closed loop; the extension synchronizes the analog time and frequency information sent by the host in the optical fiber link to establish a local time reference, reports its own working status in the form of a serial digital signal, receives host control information, and establishes a ring-structured optical fiber synchronization network through analog and digital data links. The method of the present invention includes a hybrid encoding and decoding method for analog and digital signals in a burst optical fiber ring network.

[0032] like Figure 2 As shown, the host includes: a time synchronization unit, a burst photoelectric conversion unit, a hybrid decoding unit, a core control unit, a hybrid encoding unit and a frequency reference unit, wherein the frequency reference unit is respectively connected to the time synchronization unit, the core control unit and the hybrid encoding unit, the core control unit is respectively connected to the time synchronization unit, the burst photoelectric conversion unit, the hybrid decoding unit and the hybrid encoding unit, and the burst photoelectric conversion unit is connected to the hybrid decoding unit.

[0033] like Figure 3 As shown, the extension includes: a time synchronization unit, a burst photoelectric conversion unit, a hybrid decoding unit, a core control unit, a hybrid coding unit and a frequency reference unit, wherein the frequency reference unit is respectively connected to the time synchronization unit, the core control unit and the hybrid coding unit, the core control unit is respectively connected to the time synchronization unit, the burst photoelectric conversion unit and the hybrid coding unit, and the hybrid decoding unit is respectively connected to the time synchronization unit and the burst photoelectric conversion unit.

[0034] The mixed coding unit compiles a mixed code at a rate of once per second. The mixed code divides different time periods within one second into different code areas according to the device number. After the device in the ring network completes time synchronization, it adds its own coding information to the fixed code area. At the same time, a proper interval area is reserved between the code areas to avoid the synchronization error caused by link delay accumulating into the coding process and causing code area coverage; the coding information consists of three parts: the header is the preamble and the analog second pulse signal, the middle is the device status code, and the tail is the device control word code. Except for the analog second pulse signal, the rest are digital signals. The preamble format is fixed to ten Byte, including header, device working status, device number, checksum and other contents. The local time is maintained by the counting frequency of the core control unit. Therefore, the leading code can be output in advance before the arrival of the analog second pulse signal, prompting the arrival of the analog second pulse signal, and providing analysis for the hybrid decoding unit; to match the serial interface logic, the "punctual" moment represented by the analog second pulse signal is characterized by a falling edge. After the falling edge arrives, the low level continues for a period of time, indicating that the second pulse signal has been sent. The remaining part of the code area is filled with the device status code and the control word code. These two parts also include the header, data segment and checksum.

[0035] The hybrid decoding unit of the host is used to decode the second pulse signal in the extension coding area, compare it with the local reference signal to obtain the fiber optic link delay, and use this data to control the extension to perform output compensation. At the same time, the working status coding information reported by the host decoding extension is summarized and displayed on the interactive interface; the hybrid decoding unit of the extension is used to decode the host time reference information from the optical fiber link, and the core control unit controls the time synchronization unit to complete time synchronization, and adds the synchronized second pulse information, working status and control word coding information to the extension coding area.

[0036] The frequency reference unit consists of a reference frequency standard (including but not limited to atomic clocks, crystal oscillators, and crystals) and a clock fan-out circuit. The reference frequency standard provides a standard frequency output, and the clock fan-out circuit expands the single-channel output into multiple-channel outputs for use by other units.

[0037] The core control unit is implemented by a processor (including but not limited to a single-chip microcomputer, CPU, DSP, FPGA). The core control unit drives the time synchronization unit to complete precision time synchronization, maintains the local time reference through the frequency signal of the frequency reference unit, provides an interface link between the encoding and decoding unit and the burst photoelectric conversion unit, and the host core control unit controls the extension optical fiber link delay compensation.

[0038] The burst type photoelectric conversion unit is controlled by the core control unit to complete the discontinuous photoelectric and electro-optical signal conversion.

[0039] A hybrid coding method for a time synchronization signal hybrid coding device in a burst optical fiber ring network includes a host completing the hybrid coding of analog digital signals in the burst optical fiber ring network and an extension completing the hybrid coding of analog digital signals in the burst optical fiber ring network.

[0040] The host completes the mixed encoding of analog and digital signals in the burst optical fiber ring network, including the following steps:

[0041] Step 1.1, the host starts working, synchronizes the external reference second pulse signal, and uses the frequency reference unit signal to establish the ring network time reference;

[0042] Step 1.2, the time-frequency reference information, the working status information and the control word information are mixed and encoded, and after encoding, they are added to the encoding area corresponding to the device number through a burst photoelectric conversion unit;

[0043] Step 1.3, decode the synchronous second pulse signal, working status and control word information fed back by the extension, calculate the extension link compensation value and distribute it through the control word coding area, summarize the extension status and prompt the ring network status at a frequency of once per second, and end.

[0044] The extension completes the mixed encoding of analog and digital signals in the burst optical fiber ring network, including the following steps:

[0045] Step 2.1: The extension starts working, connects to the optical fiber ring network, and uses the decoding unit to analyze the host time reference information in the ring network.

[0046] Step 2.2, determine whether synchronization with the time reference in the ring network is completed. If synchronization is completed, execute step 2.3, otherwise repeat step 2.2;

[0047] Step 2.3, after the extension time is synchronized, the synchronized local time and frequency reference information, working status information, control word information, etc. are mixed and encoded, and then sent to the encoding area corresponding to the device number through the burst photoelectric conversion unit;

[0048] Step 2.4: Compensate the link delay into the local time base according to the host command, and feed back the device local time base, working status and other information to the host every second. The host will perform status summary monitoring, and the process ends.

[0049] Example

[0050] According to the above-mentioned device and method for hybrid coding of time synchronization signals in a burst optical fiber ring network, a corresponding hybrid coding device is constructed for testing to verify the effect of the present invention.

[0051] like Figure 1As shown, the embodiment of the present invention includes 2 hosts and 14 extensions. The hosts and extensions form a ring network through optical fibers. In the hybrid coding format, 1s time is divided into 20 coding intervals. The hosts occupy coding intervals 1 and 2, and the extensions occupy coding intervals 3 to 16 according to the device numbers. The remaining coding intervals are reserved. After the two hosts are synchronized with the external time source, they both send time information in their own coding intervals, but only the host in the main working state sends the frequency to the ring network. The extensions in the ring network distinguish the main host and the backup host in the ring network through the leading code, synchronize the main host time, establish the extension local time base, and send the coding signal to the corresponding coding area after the synchronization is completed. The second pulse information contained in the extension coding area is the 20Hz pulse signal of the corresponding device number. Because the devices in the ring network have the same time base, after the hybrid coding area is divided into 20 coding areas, the second pulse signal in the hybrid coding in coding area 1 occupied by the main host is the time base of the entire ring network, and other devices cannot occupy this coding segment again. Other devices in this ring network use a pulse signal with a certain deviation from the punctual time (in steps of 50ms) as the reference second mark signal fed back to the encoding area. The host measures the phase difference between the reference second pulse signal and the second pulse signal fed back by the extension, and calculates the fixed deviation introduced by the encoding process. According to this encoding method, the host can obtain the link delay measurement result of all devices in the ring network once a second, and take the average after obtaining 10 valid results in succession. Due to the symmetry of the optical fiber link, the link delay is considered to be 1 / 2 of the average result. After completing the delay result calculation, the host sends the delay value to the extension. Through the control information link, the extension is controlled to compensate for the output timing signal. At the same time, the working status information of other devices in the ring network can be monitored every second.

[0052] like Figure 4 As shown, the host completes the mixed encoding of analog and digital signals in the burst optical fiber ring network, including the following steps:

[0053] (1) The host starts working, connects to the optical fiber ring network, synchronizes the external reference signal, and uses the frequency reference unit signal to establish the ring network time reference. During the establishment process, the two hosts are distinguished as the main host and the backup host according to certain criteria;

[0054] (2) The main host performs mixed encoding of the time and frequency reference information, working status information, control word information, etc., and after encoding, adds it to the No. 1 encoding area through the burst photoelectric conversion unit;

[0055] (3) The main host decodes the synchronous second pulse signals, working status, control word information, etc. fed back by all extensions and the backup host, calculates the extension link compensation value and distributes it through the control word coding area, controls the extension to complete the link delay compensation, summarizes and updates the status of all devices in the ring network at a frequency of once per second and prompts it externally. At this point, the frequency reference device has established a stable burst optical fiber ring network data link, and the process ends.

[0056] like Figure 5 As shown, (1) the extension starts working, connects to the optical fiber ring network, and parses the host time reference information in the ring network through the decoding unit

[0057] (2) Determine whether synchronization with the time reference in the ring network is completed. If synchronization is completed, execute step (3); otherwise, execute step (2) all the way.

[0058] (3) After the extension time is synchronized, the synchronized local time and frequency reference information, working status information, control word information, etc. are mixed and encoded, and then sent to the encoding area corresponding to the device number through the burst photoelectric conversion unit;

[0059] (4) According to the host's instructions, the link delay is compensated into the local time base, and the device's local time base, working status and other information are fed back to the host every second. The host performs status summary monitoring, and the process ends.

[0060] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A time synchronization signal hybrid encoding device in a burst optical fiber ring network, characterized in that: It includes a host and multiple extensions, wherein the host and multiple extensions are connected end to end in series inside the optical fiber ring network to form a ring network; the host sends time and frequency reference information through the ring network, and the extension receives and synchronizes the host time and frequency reference information, and at the same time forwards the host information to the next-level extension until it returns to the host, completing the closed loop; the extension synchronizes the analog time and frequency information sent by the host in the optical fiber link to establish a local time reference, reports its own working status in the form of a serial digital signal, receives host control information, and establishes a ring-structured optical fiber synchronization network through analog and digital data links.

2. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 1, characterized in that: The host includes: a time synchronization unit, a burst photoelectric conversion unit, a hybrid decoding unit, a core control unit, a hybrid encoding unit and a frequency reference unit, wherein the frequency reference unit is respectively connected to the time synchronization unit, the core control unit and the hybrid encoding unit, the core control unit is respectively connected to the time synchronization unit, the burst photoelectric conversion unit, the hybrid decoding unit and the hybrid encoding unit, and the burst photoelectric conversion unit is connected to the hybrid decoding unit.

3. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 2, characterized in that: The extension includes: a time synchronization unit, a burst photoelectric conversion unit, a hybrid decoding unit, a core control unit, a hybrid coding unit and a frequency reference unit, wherein the frequency reference unit is respectively connected to the time synchronization unit, the core control unit and the hybrid coding unit, the core control unit is respectively connected to the time synchronization unit, the burst photoelectric conversion unit and the hybrid coding unit, and the hybrid decoding unit is respectively connected to the time synchronization unit and the burst photoelectric conversion unit.

4. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 3, characterized in that: The mixed code rate compiled by the mixed coding unit is once per second; the mixed code divides different time periods within one second into different code areas according to the device number. After the device in the ring network completes time synchronization, it adds its own coding information in the fixed code area, and reserves interval areas between the code areas to avoid the synchronization error caused by link delay accumulating into the coding process and causing code area coverage.

5. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 4, characterized in that: The coded information includes three parts: the header is a leading code and an analog second pulse signal, the middle is a device status code, and the tail is a device control word code. Except for the analog second pulse signal, the rest are digital signals. The leading code format is fixed to ten bytes, including the header, device working status, device number and checksum. The local time is maintained by the counting frequency of the core control unit. Therefore, the leading code is output in advance before the arrival of the analog second pulse signal, indicating that the analog second pulse signal is about to arrive for the hybrid decoding unit to parse; in order to match the serial interface logic, the "on time" moment represented by the analog second pulse signal is characterized by a falling edge. After the falling edge arrives, the low level continues for a period of time, indicating that the second pulse signal has been sent. The remaining part of the code area is filled with the device status code and the control word code. These two parts also include the header, data segment and checksum.

6. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 3, characterized in that: The hybrid decoding unit of the host is used to decode the second pulse signal in the extension coding area, compare it with the local reference signal to obtain the fiber optic link delay, and use this data to control the extension to perform output compensation. At the same time, the working status coding information reported by the host decoding extension is summarized and displayed on the interactive interface; the hybrid decoding unit of the extension is used to decode the host time reference information from the optical fiber link, and the core control unit controls the time synchronization unit to complete time synchronization, and adds the second pulse information, working status and control word coding information after self-synchronization to the extension coding area.

7. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 3, characterized in that: The frequency reference unit includes a reference frequency standard and a clock fan-out circuit. The reference frequency standard is used to provide a standard frequency output. The clock fan-out circuit expands a single-channel output into multiple-channel outputs for use by other units.

8. The hybrid encoding device for time synchronization signals in a burst optical fiber ring network according to claim 3, characterized in that: The core control unit is implemented using a processor. The core control unit is used to drive the time synchronization unit to complete precision time synchronization, maintain the local time reference through the frequency signal of the frequency reference unit, provide an interface link between the encoding and decoding unit and the burst photoelectric conversion unit, and the host core control unit controls to achieve extension optical fiber link delay compensation.

9. A hybrid coding method for a time synchronization signal hybrid coding device in a burst optical fiber ring network according to any one of claims 1 to 8, characterized in that: The host completes mixed coding of analog digital signals in a burst optical fiber ring network and the extension completes mixed coding of analog digital signals in a burst optical fiber ring network, wherein the host completes mixed coding of analog digital signals in a burst optical fiber ring network including the following steps: Step 1.1, the host starts working, synchronizes the external reference second pulse signal, and uses the frequency reference unit signal to establish the ring network time reference; Step 1.2, the time-frequency reference information, the working status information and the control word information are mixed and encoded, and after encoding, they are added to the encoding area corresponding to the device number through a burst photoelectric conversion unit; Step 1.3, decode the synchronous second pulse signal, working status and control word information fed back by the extension, calculate the extension link compensation value and distribute it through the control word coding area, summarize the extension status and prompt the ring network status at a frequency of once per second, and end.

10. The hybrid coding method of a time synchronization signal hybrid coding device in a burst optical fiber ring network according to claim 9, characterized in that: The extension completes the mixed encoding of analog and digital signals in the burst optical fiber ring network, including the following steps: Step 2.1: The extension starts working, connects to the optical fiber ring network, and parses the host time reference information in the ring network through the decoding unit; Step 2.2, determine whether synchronization with the time reference in the ring network is completed. If synchronization is completed, execute step 2.3, otherwise repeat step 2.2; Step 2.3, after the extension time is synchronized, the synchronized local time and frequency reference information, working status information, control word information, etc. are mixed and encoded, and then sent to the encoding area corresponding to the device number through the burst photoelectric conversion unit; Step 2.4: Compensate the link delay into the local time base according to the host command, and feed back the device local time base, working status and other information to the host every second. The host will perform status summary monitoring, and the process ends.

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