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Photo crystal/multimode interference coupler-based mixed polarizing beam splitter

A polarization beam splitter and multi-mode interference technology, which is applied in the coupling of optical waveguides, optics, instruments, etc., can solve the problems of large size, large loss, and inappropriateness, and achieve the effect of compact structure

Inactive Publication Date: 2009-09-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this design has disadvantages: large size, large loss, not suitable for integration with other devices

Method used

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  • Photo crystal/multimode interference coupler-based mixed polarizing beam splitter
  • Photo crystal/multimode interference coupler-based mixed polarizing beam splitter
  • Photo crystal/multimode interference coupler-based mixed polarizing beam splitter

Examples

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Embodiment Construction

[0018] refer to figure 1 , the polarizing beam splitter based on photonic crystal / multimode interference coupler hybrid type of the present invention, comprises multimode interference coupler 2, is connected with input waveguide 1 and TE output waveguide 5 at one end of multimode interference coupler 2, and the other end A TM output waveguide 4 is connected, and a photonic crystal layer 3 is embedded in the multimode interference coupler 2 . The photonic crystal layer 3 is a two-dimensional periodic array of air holes in the layered dielectric material. The two-dimensional periodicity refers to the triangular crystal in which the connection lines of the centers of any adjacent three holes in the array form an equilateral triangle. grid.

[0019] In the illustrated example, the input waveguide 1, the TM output waveguide 4 and the TE output waveguide 5 are single-mode waveguides with the same length (10 μm) and the same width (1 μm). The determination of the photonic crystal s...

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Abstract

The hybrid polarization beam splitter based on photonic crystal / multimode interference coupler disclosed by the present invention includes a multimode interference coupler, one end of the multimode interference coupler is connected with an input waveguide and a TE output waveguide, and the other end is connected with a TM output waveguide , with a photonic crystal layer embedded in the multimode interference coupler. The present invention combines the multi-mode interference coupler with the photonic crystal, uses the photonic crystal layer to reflect and transmit the TE and TM polarization respectively, and then collects the energy of the TE and TM polarization respectively through the self-imaging principle of the multi-mode interference area, from different The output waveguide outputs to realize polarization beam splitting. The invention has a compact structure, the size of the whole device can reach 50 μm×20 μm, the input and output use the traditional waveguide, the whole process is completely consistent with the traditional integrated device, and it is very easy to realize integration with other devices.

Description

technical field [0001] The invention relates to the field of polarization beam splitting devices, in particular to a hybrid polarization beam splitter based on a photonic crystal / multimode interference coupler. Background technique [0002] The polarization beam splitter is an important functional device, especially when the optical path needs to control the polarization state. Polarizing beam splitters based on traditional optics are mostly based on the birefringence characteristics of crystals. Using the difference in the refractive index of birefringent crystals for o-light and e-light, two kinds of polarized light that emerge in different directions can be obtained. However, this traditional polarization beam splitter has a large size and cannot be applied in the field of integrated optics. [0003] Photonic crystal is an artificially manufactured dielectric structure with periodicity in space. When light propagates in this periodic dielectric structure, a band gap sim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/27G02B6/10G02B27/28
Inventor 时尧成何赛灵王喆超
Owner ZHEJIANG UNIV
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