Method and circuit for carrying out compensation on additional phase drift of Y-shaped waveguide

Abstract

The invention relates to a method and a circuit suitable to carry out compensation on an additional phase drift of a Y-shaped waveguide based on a thermosensitive resistor in an optical fiber gyroscope, an optical fiber current sensor and other relevant optical fiber sensors. The method comprises the following steps: (1), obtaining an analog signal to be applied onto the Y-shaped waveguide; (2), carrying out amplification processing on the analog signal obtained in the step (1) through an operational amplifying circuit, wherein an amplification factor is determined by the operational amplifying circuit; (3), carrying out reverse compensation on the amplification factor in the step (2) to obtain a compensated modulating voltage to be applied onto the Y-shaped waveguide; and (4), applying the compensated modulating voltage onto the Y-shaped waveguide. The invention provides the method and the circuit for carrying out the compensation on the additional phase drift of the Y-shaped waveguide, which have a simple process, is easy for engineering realization, and have low cost and no damage to a favorable encapsulating structure of the Y-shaped waveguide.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and relates to a method and a circuit for compensating the additional phase drift of a Y-shaped waveguide, in particular to a Y-type sensor based on a thermistor in an optical fiber gyroscope, an optical fiber current sensor and other related optical fiber sensors. A method and circuit for compensating waveguide additional phase drift. Background technique [0002] The Y-waveguide used in the interferometric fiber optic gyroscope is an important optical device with multiple functions packaged using integrated optics technology. The Y-shaped waveguide mainly provides three major functions: beam splitting, polarization, and phase modulation. Among them, the phase modulation part is the most important, and it is also most seriously affected by temperature interference. The Y-shaped waveguide phase modulation part is made of LiNbO 3 Crystal packaged. Due to the linear electro-optic effect, in...

Images