Design Of Multi-System OTN Signal Coherent Detection Platform

With the advent of the 5G era and the rapid popularization of high-bandwidth Internet services,the pressure on the optical communication backbone network is increasing day by day.The traditional optical communication system can no longer meet the demand,and upgrading the optical transmission system again is an inevitable trend of development.At present,the common optical signal detection modules with speeds above100 G in the field of optical network transmission are dedicated to signals of a specific system,and because the specifications and protocols used by various equipment manufacturers are different,they can access OTN signals of different systems.Different equipment must be developed,which will cause adverse effects such as large investment funds and long development cycles.Therefore,it is particularly important to develop an OTN platform that can be compatible with multiple rates and modulation formats.This article presents a design and implementation plan for the integrated receiving and processing platform of multi-system OTN signals,aiming to complete the receiving and processing of signals with multiple rates and multiple modulation formats.The main content of the article is:(1)In view of the "non-cooperative" conditions of the optical network signal integrated receiver for the access requirements of different systems of optical network transmission signals,this paper proposes three different multi-system OTN signal receiver implementation schemes to achieve flexibility for different systems of optical signals Adapt and compare the three technical solutions.(2)Analyzing the design requirements of the system hardware platform,select the core components,and design the ADC sampling clock and power module in detail: the power module is designed with a two-layer architecture of switch-linear stabilized power supply,which improves the power module’s performance.Overall performance: The use of medium phase-locked oscillator PLDRO to design the ADC sampling clock can reduce the impact of external interference on the clock and obtain a stable and high-precision clock.(3)Based on the hardware of the multi-system OTN signal coherent detection platform,the control software of the hardware platform is designed and implemented,and the basic principles and algorithm flow of symbol rate estimation and modulation recognition are introduced respectively.(4)The software and hardware functions of the platform are tested with near-end loopback,far-end loopback,and optical signal access.The results show that the hardware and software functions of the multi-system OTN signal coherent detection platform meet the requirements.