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Cylindrical polarizing beam splitter with ultra-small asymmetric structure

A symmetrical structure, ultra-small non-technology, applied in the coupling of instruments, optical waveguides, light guides, etc., can solve the problem of high cost, failure to meet the needs of optical device integration and interconnection, and the latest polarization beam splitter is not small enough, etc. problem, to achieve the effect of ultra-small size, easy large-scale integration, and low insertion loss

Inactive Publication Date: 2016-09-21
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latest polarization beam splitter designed based on this method is still not small enough, and the cost is high, and it cannot better meet the needs of optical device integration, especially the interconnection between chips.

Method used

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  • Cylindrical polarizing beam splitter with ultra-small asymmetric structure
  • Cylindrical polarizing beam splitter with ultra-small asymmetric structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Below in conjunction with accompanying drawing and embodiment describe in detail:

[0028] 1. Overall

[0029] Such as figure 1 , the cylindrical polarization beam splitter includes a curved strip waveguide 10, a curved periodic microstructure waveguide 20 and an insulating layer 30;

[0030] On the insulating layer 30, the curved strip waveguide 10 and the curved periodic microstructure waveguide 20 are arranged opposite to each other.

[0031] 2. Function block

[0032] 1) Curved strip waveguide 10

[0033] The curved strip waveguide 10 is a Si waveguide, including an input section 11 , a strip waveguide coupling section 12 and a TE output section 13 connected in sequence, in an inverted "C" shape.

[0034] Its function is that both the input section 11 and the TE output section 13 are bent at a certain angle to avoid re-coupling of the separated polarization states; the input section 11 transmits the TE / TM mixed polarization state, and the TE output section 13 tr...

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Abstract

The invention discloses a cylindrical polarization beam splitter with an ultra-small asymmetric structure, and relates to a polarization beam splitter. The structure of the present invention is: on the insulating layer, the curved strip waveguide and the curved periodic microstructure waveguide are arranged in reverse; the curved strip waveguide is a Si waveguide, which includes sequentially connected input sections, strip waveguide Section and TE output section, in reverse "C" shape; the curved periodic microstructure waveguide is a Si waveguide, including sequentially connected curved connection section, periodic cylindrical coupling section and TM output section, in the shape of "C" Shape; the periodic columnar coupling section is composed of a plurality of Si dielectric columns arranged in parallel. The polarization beam splitter has short coupling length and ultra-small volume, which is convenient for large-scale integration and reduces costs; it has small insertion loss and low beam splitting difficulty, and can be widely used as an important functional device in polarized light navigation, optical communication, photoelectric detection and optical Sensing and other fields.

Description

technical field [0001] The invention relates to a polarizing beam splitter, in particular to a cylindrical polarizing beam splitter with an ultra-small asymmetric structure. Background technique [0002] Traditional polarizing beam splitters are bulky and cannot be used for optical path integration. At present, there are several methods for realizing polarization beam splitting based on micro-nano optical waveguides. There are two main methods: using the periodic coupling between waveguides and the method of odd-even change, or introducing the asymmetry of the transmission waveguide. The principle is essentially the same: when the effective refractive index of the TE mode / TM mode in the waveguides on both sides is equal, the phase matching condition is satisfied, and the mode can be coupled, that is, the mode is transferred from one waveguide to the other waveguide. The latest polarization beam splitters designed based on this method are still not small enough, the cost is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/126G02B6/27
Inventor 侯金王林枝李博雅杨春勇陈少平
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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