Laser wavelength real-time monitoring method based on polarization fiber interferometer

Abstract

The invention discloses a laser wavelength real-time monitoring method based on a polarization optical fiber interferometer, which comprises the following steps of: acquiring four paths of interference signals with phase shifts of 0 degree, 90 degrees, 180 degrees and 270 degrees by using a polarization optical fiber interferometer system wavelength real-time monitoring device; the four paths of space phase-shifting interference signals carrying real-time wavelength information are demodulated through a four-step phase-shifting method to obtain corresponding phase information, then wavelength information is obtained, and real-time monitoring of the wavelength of the laser is achieved. A polarization maintaining optical fiber and a device are adopted in the polarization optical fiber interferometer system, synchronous phase shifting is achieved, and meanwhile the problem of amplitude jitter caused by the unstable polarization direction of interference light in a common optical fiber interferometer is solved. According to the invention, only one four-quadrant detector is needed to obtain the light intensity information of four pixels, and the wavelength variation can be fed back, so that the error problem caused by long displacement is avoided, the cost is reduced, the method has the characteristics of low insertion loss, high sampling rate and high precision, and the real-time wavelength monitoring of the laser can be realized.

Description

technical field [0001] The invention belongs to the field of laser spectral characteristic measurement, in particular to a real-time monitoring method of laser wavelength based on a polarization optical fiber interferometer. Background technique [0002] As a measurement reference value, wavelength is widely used in the measurement of length, speed, angle, flatness, straightness and perpendicularity. It is an important measurement parameter in the fields of precision metrology, precision machinery and microelectronics industries. Accurate measurement of wavelength and stability is a The key to ensuring measurement accuracy and value traceability. With the wide application of lasers in industrial processing, communication, measurement, medical treatment, scientific research and other fields, it is becoming an urgent need to measure the laser wavelength conveniently and quickly. [0003] Wavelength monitoring is very important in the field of optical fiber communication. Wit...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a laser wavelength real-time monitoring method based on polarization fiber interferometer, and introduces synchronous phase shifting through polarization fiber interferometer, which solves the problem of real-time wavelength monitoring

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