Crystal polarization maintaining fiber coupler and manufacturing method thereof

Abstract

The invention provides a crystal polarization maintaining fiber coupler and a manufacturing method thereof. The fiber coupler comprises a first double-fiber collimator, a polarization beam combiner, a polarization beam splitter and a second double-fiber collimator, wherein a first polarization maintaining fiber and a second polarization maintaining fiber are arranged in the first double-fiber collimator, the polarization beam combiner is located at an emergent end of the first double-fiber collimator, the polarization beam combiner is provided with a first crystal and a second crystal which are butted to each other, an optical axis of the first crystal is perpendicular to that of the second crystal, the polarization beam splitter is located at an emergent end of the polarization beam combiner and is provided with a third crystal and a fourth crystal which are butted to each other, an optical axis of the third crystal is perpendicular to that of the fourth crystal, an included angle within a preset degree is formed by the optical axis of the third crystal and the optical axis of the first crystal, the second double-fiber collimator is located at the emergent end of the polarization beam combiner, and a first emergent optical fiber and a second emergent optical fiber are arranged in the second double-fiber collimator. The manufacturing method of the crystal polarization maintaining fiber coupler is further provided. The crystal polarization maintaining fiber coupler is high in extinction, flexible in adjustment of optical power of light rays and simple in manufacturing.

Description

Technical field [0001] The invention relates to an optical device, in particular to a crystal polarization maintaining optical coupler and a manufacturing method of the optical coupler. Background technique [0002] With the development of network communication, the data transmission speed of the optical fiber network is getting faster and faster, and the capacity requirements of the optical fiber network are getting higher and higher. The existing optical fiber network transmission often uses linearly polarized light, and at the same time, a polarization-maintaining optical coupler is used to adjust the optical power of the incident light so that the optical power of the emitted light meets certain requirements to meet the requirements of the optical power of the transmitted light in the optical fiber network. Claim. [0003] The Chinese invention patent application with publication number CN101178463A discloses an invention called "a fusion-tapered 3×3 polarization-maintaining f...

AI Technical Summary

Problems solved by technology

[0008] However, if it is necessary to adjust the splitting ratio of the outgoing light from the two optical fibers 12 and 16, different coating layers need to be coated on the diaphragm 13, resulting in very inflexible adjustment of the splitting ratio by the optical coupler.

In addition, the coating process of the diaphragm 13 is very demanding, often due to inadequate processing, the splitting ratio of the diaphragm 13 cannot meet the requirements, which affects the quality of the optical coupler

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