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A Symmetrical Three-Waveguide Polarizing Beam Splitter Based on Subwavelength Structure

A polarization beam splitter and sub-wavelength structure technology, applied in the field of integrated optics, can solve problems such as unfavorable process operation, high design complexity and loss, and achieve the effect of reducing weak coupling, reducing dependence and stabilizing device performance

Active Publication Date: 2020-12-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional polarization beam splitters separate TE and TM polarized light by using slotted waveguides, tapered waveguides, or curved waveguides; however, it also brings higher design complexity and loss, which is not conducive to process operation

Method used

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  • A Symmetrical Three-Waveguide Polarizing Beam Splitter Based on Subwavelength Structure
  • A Symmetrical Three-Waveguide Polarizing Beam Splitter Based on Subwavelength Structure
  • A Symmetrical Three-Waveguide Polarizing Beam Splitter Based on Subwavelength Structure

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Embodiment Construction

[0022] Such as figure 1 As shown, a symmetrical three-waveguide polarization beam splitter based on subwavelength structure, including: input channel 1, right channel 2, right output channel 3, middle channel 4, left channel 5, left output Channel 6; one end of right direct channel 2 is connected to input channel 1, and the other end is connected to right output channel 3; one end of left direct channel 5 is connected to left output channel 6; left direct channel 5, middle direct channel 4 and the right through channel 2 are arranged parallel and aligned, and the distance between the three channels is 200nm-500nm, forming a symmetrical three-waveguide directional coupler structure 7 .

[0023] figure 2 is a schematic cross-sectional view of the symmetrical three-waveguide directional coupler structure 7 . The middle of the through channel in the coupling area is etched into a subwavelength grating structure (SWG); the SWG structure is composed of high refractive index mater...

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Abstract

The invention discloses a symmetrical three-waveguide type polarization beam splitter based on a sub-wavelength structure. The symmetrical three-waveguide type polarization beam splitter comprises aninput channel, a right straight-through channel, a right output channel, a middle straight-through channel, a left straight-through channel and a left output channel. One end of the right straight-through channel is connected with the input channel, and the other end is connected with the right output channel; one end of the left straight-through channel is connected with the left output channel;the left straight-through channel, the middle straight-through channel and the right straight-through channel are arranged in parallel in an aligned mode, the distance among the three channels is 200nm, and a symmetrical three-waveguide directional coupler structure is formed. According to the invention, the insertion loss of the beam splitter is effectively reduced, the extinction ratio of the device is improved, and the size of the device is shortened.

Description

technical field [0001] The invention relates to the technical field of integrated optics, in particular to a symmetrical three-waveguide polarization beam splitter based on a subwavelength structure. Background technique [0002] In recent years, silicon-on-insulator (SOI) waveguide devices have attracted widespread attention due to their low power consumption, high integration density, and compatibility with complementary metal-oxide-semiconductor (CMOS); and have been practically applied in many optical fields . In SOI materials, the high refractive index difference between the cladding layer and the core layer makes the device compact, which is beneficial to the integration of photonic systems; but it also brings birefringence, which leads to the polarization-dependent properties of the device. Therefore, Polarization Beam Splitter (PBS), as one of the basic components in SOI-based integrated systems, is used to separate / combine TE polarized light and TM polarized light;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/12G02B6/124G02B6/126
CPCG02B6/12G02B6/124G02B6/126G02B2006/12085G02B2006/1215
Inventor 肖金标杨楠
Owner SOUTHEAST UNIV