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CN-121984576-A - Optical communication method based on hybrid multiplexing and safety isolation and OEO optical transceiver plug-in unit

CN121984576ACN 121984576 ACN121984576 ACN 121984576ACN-121984576-A

Abstract

The application discloses an optical communication method based on mixed multiplexing and safety isolation and an OEO optical terminal machine plug-in unit, relating to the technical field of optical communication, wherein the method comprises the steps of classifying and preprocessing electric signals from different service sources at a transmitting end; multiplexing the low-speed serial signal and the public telephone signal into a first multiplexing signal according to a preset time slot allocation strategy, forming a second electric signal by an Ethernet signal through an exchange module, converting the high-speed serial optical signal into a third optical signal, converting the first multiplexing signal and the second electric signal into C-band optical signals through a physically isolated SFP optical module, inputting the C-band optical signals and the third optical signals into a wavelength division multiplexer together, synthesizing the C-band optical signals into a single-channel composite optical signal, amplifying the power of the composite optical signals, transmitting the single optical signal to a receiving end through a single optical fiber, separating the C-band optical signals at the receiving end, and restoring the C-band optical signals into original service signals. The application has the low delay access, high density integration and anti-interference transmission capability for realizing multi-service in the single board scale.

Inventors

  • WANG SONG
  • Gao Haihang
  • Hong Binghou

Assignees

  • 广州汇信特通信技术股份有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (10)

  1. 1. The optical communication method based on the mixed multiplexing and the safety isolation is characterized by comprising the following steps: At a transmitting end, classifying and preprocessing electric signals from different service sources, wherein the service sources comprise a plurality of paths of low-speed serial signals with different rates, a public service telephone analog voice signal, an Ethernet signal and a high-speed serial optical signal; multiplexing the low-speed serial signal and the public service telephone signal into a first multiplexing electric signal according to a preset time slot allocation strategy through a time division multiplexing module in a field programmable gate array; the Ethernet signals are converged by a switching module to form a second electric signal; the high-speed serial optical signal is converted by OEO and then used as a third optical signal; Converting the first multiplexing electric signal and the second electric signal into C-band optical signals through a physically isolated SFP optical module respectively, and inputting the C-band optical signals and the third optical signals into a wavelength division multiplexer together to synthesize a single-channel composite optical signal; After the composite optical signal is subjected to power amplification, the composite optical signal is transmitted to a receiving end through a single optical fiber; At the receiving end, three paths of C wave band optical signals are separated through a wave decomposition multiplexer, the three paths of C wave band optical signals are respectively restored to original service signals through corresponding SFP modules, and the main SFP channel or the standby SFP channel is dynamically selected based on the monitored error rate to complete signal restoration.
  2. 2. The optical communication method based on mixed multiplexing and safety isolation according to claim 1, wherein the time division multiplexing module comprises a multiplexing circuit and a demultiplexing circuit constructed based on a field programmable gate array, the time division multiplexing module is divided into 10 time slots by adopting a reference clock of 50 MHz, 6 time slots are respectively allocated to one path of RS-232 signal, three paths of RS-422 signal and two paths of public service telephone signals, and the remaining 4 time slots are reserved for expanding service access.
  3. 3. The optical communication method based on hybrid multiplexing and security isolation according to claim 1, wherein in the time division multiplexing process, each service signal is subjected to real-time encryption processing based on a key, and decryption operation is correspondingly performed at a receiving end, the original wavelength of the high-speed serial optical signal is 1310nm, the speed range is 1.6Gbps to 2.5Gbps, and the ITU-T channel mapped to the C-band after OEO conversion participates in wavelength division multiplexing.
  4. 4. The optical communication method based on hybrid multiplexing and security isolation according to claim 1, further comprising configuring a main SFP1 channel and a standby SFP2 channel for the first multiplexed electrical signal, synchronously transmitting the same content, continuously monitoring bit error rates and signal loss alarm states of two channel signals by a receiving end, judging channel degradation states based on the bit error rates and the signal loss alarm states, and switching to the standby SFP2 channel and triggering an alarm command when judging that the main SFP1 channel is degraded.
  5. 5. The optical communication method based on mixed multiplexing and safety isolation according to claim 1, wherein the ethernet signal comprises an auto-negotiation rate level of 10/100/1000Mbps, the photoelectric conversion is completed through the same SFP channel, the wavelength division multiplexer operates in the C-band, and the channel interval is 100GHz.
  6. 6. The optical communication method based on the mixed multiplexing and the safety isolation is characterized by being used for implementing the optical communication method based on the mixed multiplexing and the safety isolation according to any one of claims 1 to 5, wherein the optical communication method based on the mixed multiplexing and the safety isolation comprises an FPGA main control unit, a multipath Ethernet physical layer interface module, an SFP optical transceiver module, a voice encoding and decoding module and a microcontroller monitoring unit; The multi-path Ethernet physical layer interface module comprises at least four Ethernet PHY chips, the MII data interface of each PHY chip is respectively connected to different I/O banks of the FPGA main control unit, and the management data input/output interface and the management clock interface are connected to the FPGA main control unit; The FPGA master control unit is configured to: in the power-on initialization stage, a working mode register is written into each Ethernet PHY chip through the management data input/output interface and the management clock interface, is set to be an MII interface mode and starts an auto-negotiation function; in the operation stage, receiving the received data signals [0:3] from each Ethernet PHY chip, receiving the effective signals and the link state signals, and encapsulating the received Ethernet frame data into TDM service frames with fixed length; after analyzing the TDM service frame to be transmitted, outputting the TDM service frame to the corresponding Ethernet PHY chip through the transmission data signals [0:3] and the transmission enabling signals; The time slot allocation of the TDM service frame is dynamically generated by a TDM scheduler in the FPGA main control unit according to a preset priority.
  7. 7. The hybrid multiplexing and security isolation based multi-service OEO optical transceiver module of claim 6, wherein the SFP optical transceiver module comprises at least one SFP Cage socket and a corresponding SFP controller chip; The differential receiving positive-end signal and the differential receiving negative-end signal of the SFP Cage socket are isolated by a differential transformer and then connected to a high-speed serial receiving pin of the FPGA main control unit; after the high-speed serial transmission pin of the FPGA main control unit is driven by the differential transformer, the high-speed serial transmission pin is connected to a differential transmission positive end signal and a differential transmission negative end signal of the SFP Cage socket; the signal loss alarm signal, the fault sending signal and the module in-place signal of the SFP controller chip are connected to the general purpose GPIO terminal of the FPGA main control unit; The FPGA master control unit is configured to: Responding to the module effective in-place signal, reading the speed mark in the EEPROM of the SFP optical transceiver module; If the OTU mode is identified as 2.5Gbps OTU mode, enabling a corresponding high-speed serial channel, descrambling a received OTU frame, extracting a payload, and injecting the payload into a designated high-speed time slot of the TDM service frame.
  8. 8. The multi-service OEO optical transceiver card based on hybrid multiplexing and security isolation of claim 6, further comprising a dual channel PCM codec and a public service telephone interface; The analog sending signal of the public service telephone interface is output to the analog input end of the first PCM codec, and the analog receiving signal is output to the analog output end of the first PCM codec; the voice sending data signal, the voice receiving data signal, the 8kHz frame synchronizing signal and the bit clock signal of the first PCM codec are connected to a first audio interface group of the FPGA main control unit; The FPGA master control unit is configured to: reading 8-bit mu-Law compressed voice data from the voice reception data signal at each sampling period with reference to an 8kHz frame synchronization signal; Packaging the compressed voice data into fixed-rate substreams and mapping the fixed-rate substreams to predefined voice time slots of TDM service frames; extracting target voice time slot data from the TDM service frame, and outputting a voice transmission data signal to the first PCM codec for digital-to-analog conversion; The TDM service frames, the Ethernet service frames and the OTU service frames share the same optical fiber transmission channel, and the FPGA main control unit uniformly schedules time slot allocation.
  9. 9. The mixed multiplexing and security isolation based multi-service OEO optical transceiver card of claim 6, comprising an EDFA optical amplifier interface; the microcontroller monitoring unit is connected to the FPGA main control unit through a universal asynchronous receiver-transmitter interface and receives a system state message containing signal loss alarm state, power supply abnormality alarm and link fault information; The general input and output pins of the microcontroller monitoring unit are connected to the amplifier enabling control pins of the EDFA optical amplifier interface; And after the signal loss alarm state is recovered and the link state is normal, delaying for a preset safety interval, and controlling the amplifier to output a low-level enabling control signal so as to re-enable the EDFA optical amplifier.
  10. 10. The mixed multiplexing and security isolation-based multi-service OEO optical transceiver card of claim 6, comprising an AC/DC power module and a DC voltage regulator set; The AC/DC power supply module receives an external alternating current power supply signal and converts the external alternating current power supply signal into a plurality of independent direct current output rails which are respectively +12V, +5V and +3.3V, and each output rail is provided with a corresponding TVS diode as an overvoltage protection element; the direct-current voltage stabilizer group is embedded with a temperature sensor and a load voltage detection unit and is used for feeding real-time voltage and temperature data back to an analog-to-digital conversion sampling channel of the FPGA main control unit; The FPGA main control unit periodically collects voltage values and temperature data of each direct-current power supply rail, outputs a power supply alarm signal when detecting that any voltage is lower than a preset voltage threshold or the temperature exceeds a safety range, and controls a power supply state indicator lamp to display the current power supply health condition according to the state of the power supply alarm signal.

Description

Optical communication method based on hybrid multiplexing and safety isolation and OEO optical transceiver plug-in unit Technical Field The application relates to the technical field of optical communication, in particular to an optical communication method based on hybrid multiplexing and safety isolation and an OEO optical transceiver plug-in unit. Background Currently, in modern dedicated communication systems, the types of services are increasingly diversified, and typical services include low-speed serial data (such as RS-232/RS-422), analog business telephone voice, ethernet monitoring data, and high-speed radar or sensing serial optical signals. The traditional architecture generally adopts a decentralized design of 'one service and one board card', namely, each type of service is provided with an independent processing board card, and each board card is accessed to a system back board through a special interface and is respectively transmitted to remote equipment through a plurality of copper cables or optical fibers. Although the scheme has the advantages of simple realization and convenient debugging in a single service scene, the scheme has obvious defects in a multi-service fusion application scene. Firstly, a plurality of physical boards are deployed in parallel to cause huge equipment volume and superposition of power consumption, and are difficult to meet the severe requirements on a compact and low-power consumption communication platform in a vehicle-mounted environment, secondly, each board is required to be independently powered, radiated and managed, so that the hardware cost is increased, more connectors, cables and fault points are introduced, the overall reliability of the system is reduced, and furthermore, due to the lack of a uniform scheduling mechanism, transmission resources cannot be shared among different services, the bandwidth utilization rate is low, and cross-service synchronization, alarm linkage or safety strategy coordination is difficult to realize. In recent years, with the development of optical communication technology, optical modems and pluggable modules thereof have been introduced into the field of dedicated communications, aiming at realizing multi-service convergence through optoelectronic integration. However, the existing optical transceiver plug-in units focus on a single service type, such as only supporting ethernet or only supporting E1/T1, or integrate multiple electrical/optical interfaces, but there are still problems of stiff resource scheduling and low transmission efficiency when multiple services are transmitted concurrently. In particular, in a communication scenario with high reliability and high security requirements, how to realize low-delay access, high-density integration and anti-interference transmission capability of multiple services in a single board scale is still a technical bottleneck to be broken through by those skilled in the art. Disclosure of Invention In order to overcome the defects of the prior art, the application provides an optical communication method based on hybrid multiplexing and safety isolation and an OEO optical transceiver plug-in unit, which realize low-delay access, high-density integration and anti-interference transmission capability of multiple services in a single board scale in a communication scene with high reliability and high safety requirements. In a first aspect, the object of the application is achieved by the following technical scheme: an optical communication method based on hybrid multiplexing and security isolation, comprising: At a transmitting end, classifying and preprocessing electric signals from different service sources, wherein the service sources comprise a plurality of paths of low-speed serial signals with different rates, a public service telephone analog voice signal, an Ethernet signal and a high-speed serial optical signal; multiplexing the low-speed serial signal and the public service telephone signal into a first multiplexing electric signal according to a preset time slot allocation strategy through a time division multiplexing module in a field programmable gate array; the Ethernet signals are converged by a switching module to form a second electric signal; the high-speed serial optical signal is converted by OEO and then used as a third optical signal; Converting the first multiplexing electric signal and the second electric signal into C-band optical signals through a physically isolated SFP optical module respectively, and inputting the C-band optical signals and the third optical signals into a wavelength division multiplexer together to synthesize a single-channel composite optical signal; After the composite optical signal is subjected to power amplification, the composite optical signal is transmitted to a receiving end through a single optical fiber; At the receiving end, three paths of C wave band optical signals are separated through a wave decomposition multiplexe