Optical fiber transmission system with transmission coefficient self-calibration function and using method

Abstract

Optical fiber transmission system with transmission coefficient self-calibration function and its use method, including transmission system front-end and transmission system back-end two parts; transmission system front-end includes front-end input circuit, integration circuit, amplification circuit, electro-optic conversion circuit, electro-optic conversion circuit, control signal Response circuit and standard square wave generation circuit; the back end of the transmission system includes photoelectric conversion circuit, amplifier circuit, output circuit, photoelectric conversion circuit, switch control circuit, control signal generation circuit and electro-optic conversion circuit; in the laboratory, the optical fiber transmission system is compared The amplitude of the output and input electrical signals, get its transmission coefficient S 0 , and record the output amplitude U 0 ;In actual use, read the standard square wave output amplitude U in the current state 1 ;The system transmission coefficient S under the current test state 1 = S 0 ×(U 1 ÷ U 0 ), the present invention improves the transmission accuracy of the electrical signal through the optical fiber transmission system.

Description

technical field [0001] The invention relates to the technical field of electromagnetic environment effect measurement, in particular to an optical fiber transmission system with a transmission coefficient self-calibration function and a use method. Background technique [0002] In the field of measurement such as electromagnetic environment effect test, it is often necessary to measure parameters such as the coupling current of the cable. In order to avoid the long-distance transmission attenuation of the electrical signal responded by the coupling current sensor and the like or being interfered by the electromagnetic environment, it is often necessary to use optical fiber transmission. The system converts certain measurement signals from electro-optic to photoelectric, and transmits the signals to the remote shielding room by means of optical fiber transmission, so as to realize the measurement and recording of signals. [0003] Before using the optical fiber transmission s...

AI Technical Summary

Problems solved by technology

However, in the actual use process, the luminous efficiency of the semiconductor laser inside the optical fiber transmission system is greatly affected by the change of the external temperature. The specific performance is that as the temperature rises, the luminous efficiency of the laser decreases, and the output optical power decreases, resulting in a lower transmission coefficient in actual use. Inconsistent with the calibrated transfer coefficient

In addition, changing the optical fiber and the tightness of the optical fiber interface is different from that in the calibration state, which will also lead to changes in the transmission coefficient, resulting in measurement errors

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