Novel Mach-Zehnder polarized beam splitting interferometer

Abstract

In the invention, a polarized beam splitter prism is adopted for achieving the separation of crossed polarized light, the difficult problems of repeatedly coupling and multi-point intercoupling caused by the beams combination of two arms of a Michelson interferometer can be solved, the invention provides a novel Mach-Zehnder polarized beam splitting interferometer which comprises a polarized beam splitter prism, two sets of reflecting mirrors, a half-wave plate, a beam combined prismy, a light barrier and a photoelectric detector. In the invention, the separation of the two crossed polarized lights is achieved by adopting the polarized beam splitter prism, repeatedly coupling and multi-point mutual coupling are avoided, under the condition of the same input optical signals, the Mach-Zehnder polarized beam splitting interferometer has a better signal-to-noise ratio than that of the Michelson interferometer.

Description

technical field [0001] The invention relates to a measuring system, in particular to a polarization beam splitting interferometer. Background technique [0002] The fiber optic ring is a key component of the fiber optic gyroscope, and the research on the ring has always been a research hotspot, mainly because the structure of the fiber optic ring has poor reciprocity, which has a great impact on the accuracy of the fiber optic gyroscope. For this reason, a polarization measurement technology in the optical coherence domain is introduced into the field of polarization coupling measurement of polarization-maintaining fiber, which can realize the distribution measurement of polarization coupling strength in the fiber ring, and qualitatively analyze the force distribution in the radial direction of the fiber ring. [0003] Domestic scientific research institutions have proposed measurement methods and test systems for polarization-maintaining fiber polarization coupling intensit...

AI Technical Summary

Problems solved by technology

[0005] (1) There are unavoidable multiple couplings and multi-point mutual couplings, which seriously affect the measurement accuracy of polarization coupling strength;

[0006] (2) The attenuation of the optical path is relatively large. For small signals, the measurement requirements for photodetectors and amplifiers are high, and the signal-to-noise ratio of the overall system is poor;

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