Method and device for testing polarization maintaining fiber beat length

Abstract

The invention provides a method and a device for testing polarization maintaining fiber beat length, belonging to the optical information field. The method comprises the following steps: obtaining the transmission spectrum data T (Lambada) of a polarization maintaining fiber loop filter; fitting the transmission spectrum data T (Lambada) of at least one cycle to obtain the curve expression of thetransmission spectrum data T (Lambada) of at least one cycle, and calculating polarization maintaining fiber beat length LP after calculating the birefringence coefficient Beta. The method can ensurethe high polarization maintaining fiber beat length calculation accuracy and can realize the rapid dynamic measurement of different types of polarization maintaining fiber beat length.

Description

Technical field The invention relates to the field of optical information, in particular to a method and device for testing the beat length of a polarization maintaining optical fiber. Background technique Polarization-maintaining fiber can realize the stable transmission of the polarization state of the light wave in the fiber. It is widely used in fiber sensing, coherent optical communication, optical information processing and other fields. It is one of the most widely used special fibers. Since the propagation constants of the orthogonal modes (fast and slow axes) in the polarization-maintaining fiber are very different, the coupling probability of the two modes is small. If light is linearly polarized in a direction parallel to the optical axis of the optical fiber, the light will maintain its polarization state for transmission in the optical fiber. If the light is linearly polarized at other angles when propagating along the fiber, the polarization state will change, fr...

AI Technical Summary

Problems solved by technology

The existing technology uses two special values ​​(peak values) to estimate the period of the transmission data, and calculates the beat length based on the period. Due to the poor calculation accuracy of the period, the calculation accuracy of the beat length is poor, and the beat length accuracy is average. Only to 0.1mm

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