Countershaft matching method for side elevation of polarization maintaining optical fibre and apparatus thereof

Abstract

The invention discloses a method and a device for matching and aligning side-looking images of a polarization maintaining fiber, and belongs to the technical field of information and photoelectron. The method comprises the following steps: 1) central axes of two polarization maintaining fibers to be aligned are aligned in the same line; 2) one side of each of the fibers is illuminated by parallel light and light distribution series of the emergent light on the opposite side of each of the fibers is recorded; 3) the other side of each of the fibers is illuminated by parallel light which has an alpha angle with the parallel light in step 2) and light distribution series of the emergent light on the opposite side of each of the fibers is recorded; 4) according to the recorded light distribution series, cross correlation coefficients R1 and R2 of the two fibers in each illuminating direction are calculated respectively; and 5) one of the polarization maintaining fibers is rotated, step 2) to step 4) are repeated, and the aligning position is determined according to the cross correlation coefficients. The system comprises an imaging system, a data processing unit and a fiber control system. Compared with the prior art, the method can realize correct alignment of various polarization maintaining fibers, and has the advantages of strong commonality and low cost.

Description

technical field [0001] The invention relates to a polarization-maintaining optical fiber alignment method and a device thereof, in particular to a polarization-maintaining optical fiber side-view image matching alignment method and a device thereof, and belongs to the field of information (optoelectronics) technology. Background technique [0002] Polarization-maintaining fiber has strong polarization-maintaining ability for linearly polarized light, so it is widely used in the fields of coherent optical communication, fiber optic sensing and fiber optic gyroscope, and the polarization axis of polarization-maintaining fiber is the key to the application of polarization-maintaining fiber technology. [0003] Currently, there are two main methods for alignment of polarization-maintaining fibers: the extinction ratio alignment method and the side-view image alignment method. The extinction ratio alignment method uses linearly polarized light injected from one end of the polari...

AI Technical Summary

Problems solved by technology

When the POL method and PAS method are used to align the axis of the matched polarization maintaining fiber, since the difference between the refractive index of the stress zone and the cladding is very small, the change of the POL characteristic value curve and the PAS curve is not obvious, and the matched polarization maintaining fiber cannot be accurately realized. Axis

The five-point eigenvalue and five-finger eigenvalue methods have a very narrow range of the above-mentioned optical fiber distribution curve in practical applications, so the distance control requirements for the focal length of the side view plane are very strict

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