Method for simultaneously measuring polarization coupling distribution of optical fiber ring and beat length of surrounding optical fiber

Abstract

The invention discloses a method for simultaneously measuring polarization coupling distribution of an optical fiber ring and beat length of a surrounding optical fiber. An optical coherence domain polarization detector based on a white light interference principle is adopted for measurement, and the method comprises the steps of: measuring the length of an optical fiber ring through a meter counter when the optical fiber ring is wound, and after the optical fiber ring is wound, connecting tail fibers at the two ends of the optical fiber ring with tail fibers at the two ends of the optical coherence domain polarization detector; testing polarization coupling distribution of the optical fiber ring by adopting the optical coherence domain polarization detector; identifying two connecting points of the optical fiber ring and the optical coherence domain polarization detector from the polarization coupling distribution diagram, and testing and calculating the corresponding optical path difference of the two tail fiber connecting points of the optical fiber ring during the optical path scanning test; calculating the beat length of the optical fiber according to the optical path difference, the looped optical fiber length recorded during looping and the test wavelength; obtaining the polarization coupling distribution of the optical fiber ring and the beat length of the surrounding optical fiber at the same time through one test. The test calculation method is simple, the test process is simplified, the equipment requirement is reduced, and the test efficiency is improved.

Description

technical field [0001] The invention belongs to the field of optical measurement methods, in particular to a method for simultaneously measuring the polarization coupling distribution of an optical fiber ring and the beat length of an optical fiber around the ring. Background technique [0002] The fiber optic ring is the core component and sensitive element of the fiber optic gyroscope; at present, the optical path of the fiber optic gyroscope mainly adopts the full polarization-maintaining scheme and the hybrid polarization scheme, both of which use the polarization-maintaining fiber optic ring; the polarization-maintaining ability of the polarization-maintaining fiber optic ring is the most influential An important factor in the performance of fiber optic gyroscopes. [0003] The beat length of the ring fiber is a parameter that characterizes the polarization maintaining ability of the polarization maintaining fiber itself. The polarization coupling distribution of the f...

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Problems solved by technology

The test of the two parameters usually uses different test equipment or methods

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