Research on Hardware Optimization of Optical Time-Domain Reflectometer Based on Coherent Detection Technology
Optical time-domain reflectometer(OTDR)is the main instrument for diagnosing the fault point of optical fiber.However,normal communication services in the optical communication network need to be suspended during OTDR detection.The communication signal optical time domain reflectometry system uses the communication signal itself to detect the fault point in the optical network to improve the defects of the traditional OTDR.In the experimental measurement,it is found that the echo signal power of Rayleigh scattering and Fresnel reflection is very small.If the power is too small,it will be difficult for the oscilloscope to collect useful echo signals,which will affect the judgment of the fiber fault point.This paper proposes a scheme of using coherent detection technology to increase the echo signal power,combined with the communication signal correlation detection method to detect the fault point of the optical fiber link,so as to achieve the purpose of detection while communicating.The simulation results indicate that the power of the coherent-enhanced echo signal has increased by 10 times,enabling the detection of fault points,and the detection process does not affect normal communication operations.
optical fiber faultoptical time-domain reflectometercoherent detection technologycommunication signal
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