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A polarization-insensitive directional coupler structure and method

A directional coupler, polarization insensitive technology, applied in the coupling of optical waveguides, instruments, optics, etc., can solve the problems of birefringence, polarization insensitivity, etc., achieve easy implementation, less stringent process requirements, and achieve broadband transmission characteristics Effect

Active Publication Date: 2021-11-05
QXP TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the SOI-based directional coupler structure also has the problem of birefringence, and it is necessary to develop a polarization-insensitive directional coupler structure

Method used

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  • A polarization-insensitive directional coupler structure and method
  • A polarization-insensitive directional coupler structure and method
  • A polarization-insensitive directional coupler structure and method

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Embodiment 1

[0051] The structure of a polarization-insensitive directional coupler is as follows figure 1 shown. The cross-sectional structure of the waveguide structure in the TE mode coupling region and the TM mode coupling region is as follows: figure 2 with image 3 shown. Both the TE mode coupling region and the TM mode coupling region are asymmetric directional coupler structures. Among them, the width and height of the coupling waveguide I 3 in the TE mode coupling region are W1=400nm, H1=220nm, the width and height of the coupling waveguide II 4 are W2=575nm, H2=159.3nm, and the coupling gap G=200nm. The width and height of the coupling waveguide III 5 in the TM mode coupling region are W1=400nm, H1=220nm, the height of the coupling waveguide IV 6 is H3=202.5nm, the width W3=575nm, and the coupling gap G=200nm. The length of the curved waveguide in the output region along the beam propagation direction is 30 μm.

[0052] First, we simulate the directional coupler structure i...

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Abstract

The present invention provides a polarization-insensitive directional coupler structure and method, the structure includes an input area, a TE mode coupling area, a TM mode coupling area, and an output area; we design the coupling waveguide of the TE mode coupling area and the TM mode coupling area The structure makes it possible for the TE modes to be mutually coupled in the TE mode coupling region but not to be coupled in the TM mode coupling region, and for the TM modes to be mutually coupled in the TM mode coupling region but not to be coupled in the TE mode coupling region. Therefore, by optimizing the coupling waveguide structure and coupling length, the output of the same splitting ratio of the TE mode and the TM mode can be realized, and then the polarization-insensitive transmission characteristics can be realized. The directional coupler structure can also realize broadband transmission characteristics, and has important research and application values ​​in the fields of silicon-based photonic integration and optical communication.

Description

technical field [0001] The invention relates to the technical field of optical devices, in particular to a polarization-insensitive directional coupler structure and method. Background technique [0002] In recent years, the development of silicon-on-insulator (SOI) material is very rapid, because it can realize very small waveguide size, and its manufacturing process is compatible with CMOS, it is considered to be the most potential and hopeful material for realizing monolithic optoelectronic integrated circuit . However, the large refractive index difference between silicon (Si) and silicon dioxide (SiO2) makes the SOI waveguide have a strong birefringence effect, resulting in a relatively large gap between the transverse electric field mode (TE) and transverse magnetic field mode (TM). A large phase difference degrades the performance of optical devices. In order to solve this problem, devices such as polarization beam splitting and polarization conversion have been dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/27
CPCG02B6/2793
Inventor 郭菲程东
Owner QXP TECH INC
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