Hole Polarizing Beam Splitter with Ultra-small Asymmetric Structure
A symmetrical structure, ultra-small non-technique, applied in the direction of instruments, light guides, optics, etc., can solve the problems of not meeting the needs of optical device integration and interconnection, the latest polarization beam splitter is not small enough, high cost, etc., to achieve enhanced Effects of birefringence, difficulty reduction, and coupling length reduction
Inactive Publication Date: 2016-05-04
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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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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Embodiment Construction
[0027] Below in conjunction with accompanying drawing and embodiment describe in detail:
[0028] 1. Overall
[0029] Such as figure 1 , the hole-type 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: 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 TM output section 13 transmit...
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The invention discloses an extremely-small hole type polarization beam splitter of an asymmetric structure, and relates to a polarization beam splitter. According to the structure of the polarization beam splitter, bent slab waveguide and bent periodic micro-structure waveguide are arranged in a back-to-back mode on an insulating layer; the bent slab waveguide is Si waveguide and comprises an input section, a strip-shaped waveguide coupling section and a TM output section which are connected in sequence, and the bent slab waveguide is in a reverse C shape; the bent periodic micro-structure waveguide is Si waveguide and comprises a bent connecting section, a periodic hole type coupling section and a TE output section which are connected in sequence, and the bent periodic micro-structure waveguide is in a C shape; the size of air holes in the periodic hole type coupling section is constant, the sizes of air holes in the bent connecting section and air holes in the TE output section gradually change, and the air holes are formed at equal intervals. The polarization beam splitter is extremely small in size, beneficial to large-scale integration, capable of reducing cost, small in loss, high in beam splitting efficiency, and capable of serving as an important functional device to be widely applied to the polarizing navigation field, the optical communication field, the photoelectric detection field, the light sensing field and other fields.
Description
technical field [0001] The invention relates to a polarization beam splitter, in particular to a hole-shaped polarization 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...
Claims
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IPC IPC(8): G02B6/126
Inventor 侯金李博雅王林枝杨春勇陈少平
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES