Interferometer combined by double F-P chambers and Mach-Zehnder

Abstract

The invention provides an interferometer combined by double F-P chambers and Mach-Zehnder, which is combined by two fiber F-P interferometers and a fiber Mach-Zehnder interferometer, wherein, the Mach-Zehnder interferometer is formed by respectively welding and coupling the two ends of a single-core polarization-preserving fiber and a melt embedded double-core polarization-preserving fiber; the double F-P chambers are formed by respectively inscribing double Bragg fiber bragg grating pairs on the two fiber cores of the melt embedded double-core polarization-preserving fiber via the two fiber F-P interferometers; and each F-P chamber is respectively embedded on the two arms of the Mach-Zehnder interferometer. The interferometer of the invention has the advantages that the measuring sensitivity is improved compared with the traditional integrated Mach-Zehnder interferometer; the interferometer which is formed by the polarization-preserving fiber solves the problem of stability of the traditional interferometer caused by polarization state random variation; and the two arms of the Mach-Zehnder interferometer are positioned at one fiber, thus improving the temperature stability of the interferometer.

Description

technical field [0001] The invention relates to a combined optical fiber interferometer, which belongs to the technical field of optical fiber. Background technique [0002] Optical fiber Mach-Zehnder interferometer has a very wide range of applications in optical fiber communication, optical fiber sensing and other fields. The ordinary fiber optic Mach-Zehnder interferometer uses a 3dB fiber coupler to divide the light emitted by the semiconductor laser into two beams with equal intensity, and then enters two independent fiber optic interference arms for transmission. Through another 3dB coupler for interference, the interference light signal is converted into an electrical signal and amplified after passing through the photoelectric conversion detector, so as to realize the detection of the interference light signal, as in the patent (CN 1251906A). Since the light transmission characteristics in the two reflection arms of the optical fiber can be affected by external cond...

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Problems solved by technology

[0004] The above two interferometers are generally not highly integrated. Wang Tingyun et al. (Chinese patent CN 101464539A) proposed a Mach-Zehnder interferometer based on coaxial optical fiber. The interferometer consists of single-mode input optical fiber, coaxial optical fiber, single-mode optical fiber, coaxial Axis fiber and single-mode output fiber are sequentially connected to form a Mach-Zehnder interferometer in a single fiber; Yuan Libo et al. (Chinese patent CN 101105555A) also proposed a single fiber Mach-Zehnder interferometer, using a dual-core The integration of the above-mentioned interferometer is greatly improved, but the measurement sensitivity has not been improved, and the instability of the interference signal caused by the random change of the polarization state has not been solved.

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