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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: 2007-08-22
ZHEJIANG UNIV
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  • Abstract
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  • Claims
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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

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Embodiment Construction

[0018] With reference to Fig. 1, the polarization 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 , the other end is connected with a TM output waveguide 4, 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 cr...

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Abstract

The invention discloses a mixed polarization beam splitter based on photon crystal / multimode interference coupler, comprising multimode interference coupler whose one end is connected with input waveguide and TE output waveguide and whose other end is connected with TM output waveguide and which is inserted with photon crystal layer. And the invention combines the multimode interference coupler with the photon crystal, uses the photon crystal layer to reflect and transmit TE and TM, respectively, and then respectively collects energies of TE and TM polarization through the self-imaging principle of multimode interference region and outputs them from different output waveguides so as to implement polarization beam splitting. And its structure is compact and the whole device can be 50 mu m *20 mu m sized, and output and input use the traditional waveguides, and it is extremely easy to integrate 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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IPC IPC(8): G02B6/27G02B6/10G02B27/28
Inventor 时尧成何赛灵王喆超
Owner ZHEJIANG UNIV
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