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Compensating the influence of background noise on the operation of a fiber-optic interferometer

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Abstract

The results of an experimental test of the effectiveness of a method for compensating the influence of background noise on the operation of a fiber-optic compensative interferometer incorporated in a towable hydroacoustic cable assembly are presented herein. The principle of compensation is the detection of a separate phase signal induced by the noise on the interferometer’s arms and its subsequent subtraction from the interferometer’s output phase signal. An additional reference sensor that is isolated from external influence is introduced in the measuring system design to achieve the compensation. The effectiveness of noise canceling upon implementation of the suggested method is −14.73dB. This result can significantly reduce the noise level of measuring systems based on fiber-optic phase sensors and interferometers under real operating conditions.

© 2020 Optical Society of America

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