Panda type polarization maintaining fiber side looking shaft alignment device and panda type polarization maintaining fiber side looking shaft alignment method

Abstract

The invention discloses a panda type polarization maintaining fiber side looking shaft alignment device and a panda type polarization maintaining fiber side looking shaft alignment method. Side looking images of two fibers are acquired through an imaging microscope, a central position of the fibers and the largest light intensity position are found out by utilizing a digital image processing method, an absolute difference of the values at two positions is acquired, a relation curve of the absolute difference and a turning angle can be acquired by synchronously turning the two fibers for multiple times, secondary fitting on multiple points near the largest value point of the curve is carried out to acquire characteristic angles, characteristic angle difference of the two fibers is calculated, so a stress shaft deviation angle of the two fibers is acquired, one fiber is turned to acquire a needed stress shaft deviation angle, and thereby shaft alignment of the polarization maintaining fibers is realized. The method and the device which are mainly applied to the panda type polarization maintaining fibers can realize shaft alignment of various types of panda type polarization maintaining fibers, has advantages of high shaft alignment precision, good shaft alignment repeatability, short shaft alignment time, high shaft alignment efficiency and realized automation shaft alignment and can be used for detecting a welding angle after welding of a fiber.

Description

technical field [0001] The invention relates to the field of optical fiber sensing in optoelectronic technology, in particular to a panda-type polarization-maintaining optical fiber side-view alignment device and method. Background technique [0002] Polarization Maintaining Fiber (PMF, Polarization Maintaining Fiber) is a kind of special fiber with important application value. It has strong polarization maintaining ability for linearly polarized light and has good compatibility with ordinary single-mode fiber. It is widely used in coherent light Communication, optical fiber sensing and other fields, and polarization maintaining fiber stress axis-to-axis is the key technology in the application of polarization maintaining fiber. Panda-type polarization-maintaining fiber is the most widely used type of polarization-maintaining fiber, hereinafter referred to as polarization-maintaining fiber. [0003] The commonly used polarization-maintaining fiber alignment method can be ro...

AI Technical Summary

Problems solved by technology

The range of the above-mentioned shape optical fiber gray distribution curve in the first two is very narrow in practical application, and the distance control of the focal length of the test plane is very strict; the center gray distribution curve correlation method includes direct correlation method and indirect correlation method, and the direct correlation method is The central gray distribution curves of the left and right optical fibers are used for correlation. The indirect correlation method is to correlate the central gray distribution curves of two optical fibers with their respective simulation curves. The direct correlation method requires the same parameters of the two optical fibers, which is difficult to guarantee in practical applications. , the indirect correlation method requires prior knowledge of the model of the optical fiber to be aligned and the corresponding simulation curve, which greatly limits the application of this method

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