A method and device for transmitting analog electrical signals using optical fiber

Abstract

The invention discloses a method and a device for transmitting an analog electrical signal through an optical fiber and belongs to the field of electric power automation. The device for transmitting the analog electrical signal through the optical fiber comprises a signal sending unit (1) and a signal receiving unit (2) connected with the signal sending unit (1) through the optical fiber. The method for transmitting the analog electrical signal through the optical fiber includes steps that inputting the analog electrical signal to be transmitted and recording; generating a scale signal and sending out; coupling through a waveform mixing module to form a hybrid electrical signal; converting the hybrid electrical signal into a hybrid light signal; transmitting the hybrid light signal; receiving and converting the hybrid light signal; separating the hybrid electrical signal and sending out; measuring the attenuated scale signal and analog electrical signal and sending out; calculating and inspecting scale signal attenuation coefficients; compensating, amplifying and outputting the analog electrical signal. The device for transmitting the analog electrical signal through the optical fiber is capable of realizing the analog electrical signal transmission without attenuation through the optical fiber and is high in transmission precision; the method for transmitting the analog electrical signal through the optical fiber is capable of transmitting the analog electrical signal of an electrical power system without feedback through the optical fiber.

Description

technical field [0001] The invention discloses a method and device for transmitting analog electrical signals by using optical fibers, which belong to the field of electric power automation. Background technique [0002] In the voltage and current sampling of the power system, the original analog electrical signal without analog-to-digital conversion provides convenience for further analysis of the electrical signal because the original information of the electrical signal is completely preserved. Due to the influence of medium and environment, the transmission of analog electrical signals is more difficult. [0003] Optical fiber communication has the advantages of wide transmission frequency, large communication capacity, long transmission distance, strong anti-electromagnetic interference, and light weight. It is widely used in modern communication systems, and optical fibers can transmit digital signals and analog signals, so optical fibers can Used to transmit analog e...

AI Technical Summary

Problems solved by technology

Therefore, the technical difficulty of using optical fiber to transmit analog quantities lies in the uncertainty of attenuation loss, which seriously affects the accuracy of measurement and transmission.

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