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Polarization-maintaining fiber Verdet constant measuring device and measuring method based on Mach-Zehnder and Michelson interferometers

A polarization-maintaining fiber and measurement device technology, which is applied in measurement devices, optical instrument testing, testing fiber/optical waveguide equipment, etc., can solve the problems of small Verdet constant and difficult measurement, and achieve the effect of high measurement sensitivity

Active Publication Date: 2017-03-29
BEIHANG UNIV
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Problems solved by technology

For polarization-maintaining fiber, its linear birefringence has a great influence, and δ is relatively large. Less than 1 can not be ignored, so the Verdet constant is very small, it is difficult to measure with the above method

Method used

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  • Polarization-maintaining fiber Verdet constant measuring device and measuring method based on Mach-Zehnder and Michelson interferometers
  • Polarization-maintaining fiber Verdet constant measuring device and measuring method based on Mach-Zehnder and Michelson interferometers
  • Polarization-maintaining fiber Verdet constant measuring device and measuring method based on Mach-Zehnder and Michelson interferometers

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Embodiment Construction

[0032] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0033] The invention firstly provides a measuring device for the Verdet constant of a polarization-maintaining optical fiber based on a Mach-Zehnder and Michelson hybrid interferometer, which is used for measuring the magnetic sensitivity of the optical fiber. Measuring devices such as figure 1 As shown,. Including light source 1, fiber coupler 2, electromagnet 4, fiber polarizer A5, delay ring 6, fiber polarizer B7, polarization maintaining coupler 8, Michelson interferometer 9 and spatial polarizer 10. Wherein, the spatial polarizer 10, the electromagnet 4, and the fiber polarizer A5 are sequentially connected between the fiber coupler 2 and the polarization-maintaining coupler 8 as a signal optical path, and between the spatial polarizer 10 and the optical fiber The optical fiber 3 to be tested is connected between the pigtails of the polarizer A...

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Abstract

The invention discloses a polarization-maintaining fiber Verdet constant measuring device and a measuring method based on Mach-Zehnder and Michelson interferometers, and belongs to the technical field of fiber application. The measuring device comprises a wave train analysis module which is composed of a Mach-Zehnder interferometer and a Michelson interferometer. The measuring method comprises the following steps: selecting the length of a delay ring; gradually shortening the delay ring by equal length; recording interference fringes when the light of a reference light path interferes with the light of a signal light path; applying a magnetic field, making the light of the reference light path interfere with the light of the signal light path again, and recording interference fringes; and calculating the Verdet constant. The measuring device and the measuring method can be applied to most types of polarization-maintaining fibers and can also be extended to single-mode fibers, and is generally applicable. Measurement can be completed only by intercepting a section of fiber. The measuring sensitivity is high. Engineering application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of optical fiber applications, and in particular relates to a measuring device and method for a polarization-maintaining fiber Verdet constant (Verdet constant) based on a Mach-Zehnder and Michelson hybrid interferometer. Background technique [0002] Optical fiber is a kind of fiber made of glass or plastic. It can be used as a tool for light transmission and is widely used in the field of optical fiber sensing and communication. Its transmission principle is total reflection of light. At present, the commonly used types of optical fibers include single-mode optical fibers and polarization-maintaining optical fibers. Polarization-maintaining fiber introduces strong asymmetry into the fiber structure, so that the linearly polarized light transmitted in the fiber keeps the polarization state unchanged. At present, the main types of polarization-maintaining fiber are panda type, bow tie type, elliptical core, ...

Claims

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Application Information

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IPC IPC(8): G01M11/00
CPCG01M11/30
Inventor 宋凝芳王晓阳蔡伟高福宇金靖徐小斌
Owner BEIHANG UNIV
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