Optical time-domain reflectometer based on DSP

Abstract

The invention discloses an optical time-domain reflectometer based on a DSP. The optical time-domain reflectometer comprises an OTDR unit; the OTDR unit comprises a DSP unit; furthermore, the DSP unit is connected to a power supply unit and an operation unit through an electric conductor; the DSP unit is connected to a FPGA unit through the electric conductor; the FPGA unit is connected to a display unit through the electric conductor; the FPGA unit is connected to a laser emission control unit, a laser unit, an optical fibre coupler unit, an APD unit, a signal amplification unit, an A / D conversion unit and a FIFO unit through the electric conductor; the laser emission control unit, the laser unit, the optical fibre coupler unit, the APD unit, the signal amplification unit, the A / D conversion unit and the FIFO unit are sequentially connected electrically; furthermore, the FIFO unit is connected with the FPGA unit through the electric conductor; and the optical fibre coupler unit is connected to an optical fibre unit to be tested through the electric conductor. By means of the optical time-domain reflectometer based on the DSP disclosed by the invention, a detection result can be obtained more accurately and rapidly; furthermore, the specific position information of a fault point can be obtained accurately; and the optical time-domain reflectometer is relatively high in practicability, high in transmission precision, rapid in speed and high in anti-interference capability, and can be suitable for many changes in a network.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a DSP-based optical time domain reflectometer. Background technique [0002] At present, with the continuous development of optical communication, an important branch of optical communication - Optical Fiber Communications (Optical Fiber Communications) is gradually replacing cables and microwave communications due to its advantages of wide transmission frequency bandwidth, high anti-interference and low signal attenuation. It has become the main transmission method in the world communication. Optical fiber communication is a communication method that uses light waves as a carrier and optical fiber as a transmission medium to transmit information from one place to another. It is called "wired" optical communication. Therefore, the performance of optical fiber directly affects the speed and distance of optical signal transmission. Lightning, earthquakes, and constructions ...

AI Technical Summary

Problems solved by technology

However, the existing optical time domain reflectometers often have low transmission accuracy and poor anti-interference ability, and the traditional OTDR is aimed at the point-to-point structure, which brings inconvenience to fault location and branch transmission detection. Aiming at the above problems, a special Optical Time Domain Reflectometer Based on DSP

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