Stability control device for transmission spectrums of optical fiber current transducer

Abstract

The invention discloses a stability control device for transmission spectrums of an optical fiber current transducer, and belongs to the technical field of optical fiber transmission. According to the stability control device, the front end of a polarizer is provided with a first optical fiber filter, and the front end of a sensing unit is provided with a second optical fiber filter. According to the invention, the changes in the spectral form and power of optical waves induced by the drifting of a spectral window of an optical device caused by shaft-aligning errors and temperature in the optical fiber current transducer are eliminated, so that the transmission spectrum in the optical fiber current transducer is stable, thereby eliminating integral optical phase shifting errors of a Faraday effect of the sensing unit. A new scheme for optical paths of all-optical-fiber current transducers based on an optical fiber filter provided by the invention solves the problem that in a traditional optical path, a spectral window of an optical device drifts due to temperature drift and difficulty in accurate shaft-aligning among optical fibers or between an optical fiber and a device, eliminates the influence of spectrum fluctuation on error signals, expands the range of a system for tracking direct-current random phase drift, and improves the anti-jamming capability and stability of the system.

Description

technical field

[0001] The invention belongs to the technical field of optical fiber transmission, and in particular relates to a stable control device for optical fiber current transformer transmission spectrum. Background technique

[0002] The optical fiber current transformer based on the magneto-optical Faraday effect uses optical fiber as the sensing medium, and there is no hidden danger of ferromagnetic resonance and hysteresis saturation. A series of advantages, such as good performance and low manufacturing and maintenance costs, fundamentally avoid the inherent defects of traditional current transformers. The on-axis angle error of the optical circuit device in the fiber optic current transformer and the spectral window shift of the optical device caused by temperature will affect the spectral shape and power of the transmitted light wave in the optical path, affect the integrated optical phase shift of the Faraday effect of the sensing unit, and cause interference...

Images