Multiplexing combined polarization-preserving fiber ring implementation method and polarization-preserving fiber ring

Abstract

The embodiment of the invention provides a multiplexing combined polarization-preserving fiber ring implementation method and a polarization-preserving fiber ring. In the implementation method, the two pigtails of an original polarization-preserving fiber ring are respectively connected with the two beam coupling pigtails of two polarizing beam splitters / couplers (PBS) with polarization-preserving fiber pigtails, the two PBSes are connected by the one branch pigtail of each PBS, and the other branch pigtails of the PBSes are used as the two pigtails of the polarization-preserving fiber ring after combination, wherein both the two branch pigtails of each PBS are subject to slow-axis beam propagation and are respectively coupled with the slow axes or fast axes of the two beam coupling pigtails, so that an incident linearly polarized light wave sequentially and respectively circles round the fast axis and the slow axis of the original polarization-preserving fiber ring and then passes through the whole fiber ring. By implementing the technical scheme, the two eigen polarization axes of the polarization-preserving fiber can be fully used, thereby lengthening the effective optical path of the polarization-preserving fiber ring and effectively shortening the required fiber length under identical conditions.

Description

Technical field [0001] The invention relates to the field of optical fiber passive devices, and in particular to a method for realizing a multiplexed combined polarization maintaining fiber ring and a polarization maintaining fiber ring. Background technique [0002] In the prior art, a polarization-maintaining fiber generally refers to a single-mode fiber that can keep the polarization state of light waves unchanged during transmission. If the mode birefringence of a single-mode fiber is defined as B=(n x -n y ) / n, where nx and ny are the refractive indices corresponding to the two linear polarization eigenmodes of the single-mode fiber, and n is the average refractive index. According to the value of the fiber mode birefringence, the polarization-maintaining fiber can be divided into Two types, one is low birefringence (LB) polarization maintaining fiber (B<10 -6 ); One is high birefringence (HB) polarization maintaining fiber (B>10 -5 ), for HB type polarization maintain...

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Problems solved by technology

[0004] In the application of existing polarization-maintaining fiber rings, generally only one of the two intrinsic polarization axes of the polarization-maintaining fiber (i.e., the fast axis or the slow axis) is used, and the utilization rate is relatively low; and in these applications, its The effective optical path length of a light wave is n x L or n y L (the effective optical path of the light wave refers to the product of the refractive index n of the medium and the length L of the medium experienced by the light wave, that is, nL), which cannot effectively reduce the fiber length of the fiber ring

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