Mach-Zehnder interferometer based on coaxial optical fiber

Abstract

The invention relates to a Mach-Zehnder interferometer based on a coaxial optical fiber, which comprises a single-mode input optical fiber, a first coaxial optical fiber, a single-mode optical fiber, a second coaxial optical fiber and a single-mode output optical fiber which are connected in sequence. An optical beam splitter is formed by welding the single-mode input optical fiber and the single-mode optical fiber with two ends of the first coaxial optical fiber respectively; an optical combiner is formed by welding the single-mode optical fiber and the single-mode output optical fiber with two ends of the second coaxial optical fiber respectively; and the Mach-Zehnder interferometer is achieved in a single optical fiber. The Mach-Zehnder interferometer based on the coaxial optical fiber has the advantages of simple manufacture method, convenient operation, easy control of interference and transmission characteristics, good temperature stability, compact structure, easy integration with the prior optical fiber system, and the like, can be applied to optical fiber spectral filters, optical fiber pressure, refractive index, temperature sensor, and the like in the fields of optical fiber communication devices and fiber optic sensors.

Description

Technical field: [0001] The invention relates to a Mach-Zehnder interferometer based on coaxial optical fiber, 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 the fields of optical fiber communication and optical fiber sensing, including optical fiber filters, optical fiber modulators, optical switches, optical fiber stress sensing, optical fiber refractive index sensing, etc. The conventional Mach-Zehnder fiber optic interferometer uses a fiber coupler (2×2 and 1×2) as a beam splitter to input optical signals into two independent fiber interference arms for transmission. A fiber coupler (2×2 and 2×1) acts as a multiplexer to make the two beams interfere and output an optical signal with a spectral filtering characteristic. This common fiber optic Mach-Zehnder interferometer has been reported quite a lot in the literature, for example: Yi-Ping Wang, Jian-...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this optical fiber Mach-Zehnder interferometer is that it is difficult to precisely control the length difference of the interference arm during the preparation process, so it is difficult to control the filtering characteristics of the interference output optical signal

In addition, this structure has poor temperature stability during application and is easily affected by external influences.

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