A calibration device and calibration method for an optical phase demodulator

Abstract

The invention discloses a calibration device and calibration method for an optical phase demodulator. The calibration device comprises an interferometer calibration system and an optical fiber interference system. The interferometer calibration system comprises a light source, a photoelectric converter and an oscilloscope. The optical fiber interference system comprises an interferometer and a signal generator. A light input end of the interferometer is connected with a light output port of the light source during scaling, and is connected with an output port of a light source end machine of an optical phase demodulator to be calibrated during calibrating; a light output end of the interferometer is connected with a light input port of the photoelectric converter during scaling, and is connected with an input port of a demodulation end machine of the optical phase demodulator to be calibrated during calibrating; and the photoelectric converter converts the received light signal into an electrical signal, and outputs the electrical signal to the oscilloscope. Calibration uncertainty superior to 0.2 dB is achieved; and the metering problem of the optical phase demodulator is solved, and effective value traceability of the optical phase demodulator serving as a test instrument for an interferometric optical fiber sensor is achieved.

Description

technical field [0001] The invention belongs to the field of optical fiber sensor calibration, and relates to a calibration device for an optical phase demodulator and a method for calibrating an optical phase demodulator using the calibration device. Background technique [0002] In the field of interferometric optical fiber sensing, target signals such as sound field, temperature and strain are usually modulated on the change of optical phase, which is also called optical phase shift, and the amount of optical phase shift can be obtained accurately and quantitatively. For interferometric The measurement of parameters such as the detection sensitivity of the fiber optic sensor is of great significance. The optical phase demodulator is an instrument that demodulates the optical phase shift signal through a certain demodulation method, and can measure parameters such as the amplitude of the optical phase shift (also called the amount of optical phase shift) and frequency. ...

AI Technical Summary

Problems solved by technology

[0003] The optical phase demodulator involves a variety of demodulation methods, but the existing technology only focuses on how to develop the optical phase demodulator, and there is no calibration device and corresponding calibration method for the optical phase demodulator, which cannot meet the requirements of the optical phase demodulator. The calibration requirements of the instrument in interferometric fiber optic sensor testing and other applications

The optical phase modulation and demodulation technology currently used in the field of optical fiber communication, such as the patent of the invention titled a kind of optical continuous phase modulation and demodulation device and the invention of F. Vacondio to mediate the phase modulated optical signal Neither method can be directly applied to the metrological calibration of the optical phase demodulator

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