Bidirectional Fiber Polarization Multiplexer Based on Crystal Birefringence Effect

Abstract

The invention discloses a crystalline birefringent effect based bidirectional optical fiber polarization multiplexer which comprises a first optical fiber, a first collimator, a birefringent crystal, a first polarization-maintaining collimator, a first polarization-maintaining optical fiber, a second optical fiber, a second collimator, a shell, a second polarization-maintaining collimator, a second polarization-maintaining optical fiber and a capillary. The birefringent crystal is disposed in the middle of the inside of the capillary, the first collimator and the second polarization-maintaining collimator are arranged at one end of the capillary in parallel, the first optical fiber is connected to the input end of the first collimator by gluing, the birefringent crystal is glued at the other end of the first collimator, the second polarization-maintaining optical fiber is connected to the input end of the second polarization-maintaining collimator by gluing, and the birefringent crystal is glued at the other end of the second polarization-maintaining collimator. The first polarization-maintaining collimator and the second collimator are arranged at the other end of the capillary in parallel, the first polarization-maintaining optical fiber is glued at one end of the first polarization-maintaining collimator, the birefringent crystal is glued at the other end of the first polarization-maintaining collimator, the second optical fiber is glued at one end of the second collimator, and the birefringent crystal is glued at the other end of the second collimator. The crystalline birefringent effect based bidirectional optical fiber polarization multiplexer is simple and compact in structure, and stable in temperature performance.

Description

technical field [0001] The invention relates to a bidirectional optical fiber polarization multiplexer with bidirectional polarization and polarization maintenance functions. Background technique [0002] The traditional fiber polarization beam splitter (PBS) can divide the input light into two orthogonal polarization states and output it into two polarization maintaining fibers, which are widely used in optical fiber communication, optical fiber sensing and other fields. However, the traditional PBS is one-way and cannot be multiplexed. In some symmetrical optical paths, two PBSs need to be used, and the inconsistency of the optical parameters between the two PBSs has a great influence on the symmetry of the optical path. When two PBSs are used, the volume of the optical path is also increased. [0003] In a birefringent crystal, the incident light wave can be decomposed into linearly polarized light whose light vectors are orthogonal to each other, thereby obtaining a li...

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Problems solved by technology

While using two PBSs, it also increases the volume of the optical path

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