Full polarization-preserving fiber interferometer based on 3X3 polarization-preserving fiber coupling mechanism

Abstract

The invention relates to a novel optical fiber interferometer and in particular to an all polarization maintaining optical fiber interferometer consisting of a 3*3 polarization maintaining optical fiber coupler. The invention consists of a 2*2 optical fiber coupler and a 3*3 optical fiber coupler. The 3*3 optical fiber coupler and the 2*2 optical fiber coupler are both the coupler consisting of the polarization maintaining optical fiber. The optical fibers are all polarization maintaining optical fibers and the polarization maintaining optical fiber is parallel to the polarization axis of the coupler; the structure can be Mach-zehnder-type or Michelson-type or Sagnac-type. As the 3*3 polarization maintaining optical fiber coupler is adopted, the interferometer in the structure of the invention has good stability and high sensitivity.

Description

technical field [0001] The present invention relates to a novel optical fiber interferometer, more specifically, the present invention relates to a full polarization maintaining optical fiber interferometer formed by using 3*3 polarization maintaining optical fiber couplers. Background technique [0002] An interferometer is an instrument designed based on the principle of light wave interference. It occupies an important position in optical instruments because of its high sensitivity. The interferometer gives an interference pattern, which reflects the information of the measured object by the change of the interference fringe. The change of the interference fringe can directly measure the length or refractive index, and can also indirectly measure other physical quantities, such as angle, plane Degree, length, airflow density, roughness, surface topography, vibration, speed and acceleration, etc. [0003] Currently commonly used fiber optic interferometers can be divided ...

AI Technical Summary

Problems solved by technology

Polarization-maintaining fiber and 2×2 polarization-maintaining fiber coupler are used to form a full polarization-maintaining Mach-Zehnder interferometer, which solves the problem of system stability, but it uses 2×2 coupler, because the two outputs are in π phase Poor, need to add feedback to lock the working point of the interferometer at the maximum interference sensitivity

This makes the structure of the interferometer more complex and requires higher control

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