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A method for converting the polarization state of an optical signal with a silicon-based polarization rotator

A polarization rotator and polarization state technology, applied in the field of integrated photonics, can solve problems such as the complexity of the polarization rotator process, and achieve the effect of simple structure and low process requirements

Active Publication Date: 2022-06-17
SOUTHEAST UNIV
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Problems solved by technology

[0004] Technical problem: The purpose of the present invention is to provide a silicon-based polarization rotator based on a mode converter and an asymmetric multimode waveguide grating, which can solve the problem of complicated polarization rotators in the related art

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  • A method for converting the polarization state of an optical signal with a silicon-based polarization rotator
  • A method for converting the polarization state of an optical signal with a silicon-based polarization rotator
  • A method for converting the polarization state of an optical signal with a silicon-based polarization rotator

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[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] The method for converting the polarization state of an optical signal by a silicon-based polarization rotator of the present invention is as follows: the silicon-based polarization rotator comprises a mode converter and an asymmetric multi-mode waveguide grating that are cascaded in sequence, and the mode converter is composed of a three-stage taper. Waveguides are cascaded;

[0022] The mode converter converts the fundamental mode of the transverse magnetic mode in which the magnetic field direction of the input optical signal is perpendicular to the propagation direction, namely TM. 0 The mode is converted into a first-order transverse electric mode with the electric field direction perpendicular to the propagation direction, namely TE 1 mode output to the asymmetric multimode waveguide grating, and TE reflected back from the asymmetric multimode waveguide gr...

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Abstract

The invention proposes a silicon-based polarization rotator for converting the polarization state of an optical signal. The silicon-based polarization rotator includes sequentially cascaded mode converters and asymmetric multimode waveguide gratings. The mode converter consists of a three-stage tapered The waveguide is cascaded; the mode converter converts the fundamental mode of the transverse magnetic mode (TM) in which the magnetic field direction of the input optical signal is perpendicular to the propagation direction. 0 The mode is converted into a first-order transverse electric mode (TE) in which the direction of the electric field is perpendicular to the direction of propagation. 1 mode output to the asymmetric multimode waveguide grating, and the TE that will reflect back from the asymmetric multimode waveguide grating 1 Mode conversion to TM 0 mode, and the fundamental mode of the transverse electric mode in which the electric field direction of the input optical signal is perpendicular to the propagation direction is TE 0 The transmission of the mode does not change the polarization state; the asymmetric multimode waveguide grating will output the TE from the mode converter 0 mode reflection for TE 1 mode input back to the mode converter, converted to TM 0 mode, and will output the TE from the mode converter 1 mode reflection for TE 0 mode, input back to the mode converter, with the state of polarization unchanged.

Description

technical field [0001] The invention relates to a silicon-based photonic integrated polarization conversion technology, which belongs to the technical field of integrated photonics. Background technique [0002] In recent years, silicon-based photonic integration technology based on silicon-on-insulator (SOI) process is considered to be the most promising for large-scale photonic integration due to its high integration and CMOS process compatibility. It plays an important role in many fields such as computer, biosensing, and quantum information processing. In silicon-based integrated optical passive devices, the integrated polarization rotator is of great significance in many aspects because it can realize the regulation of polarization state. [0003] On the one hand, silicon-based optical waveguides usually support TE (transverse electrical mode with the electric field direction perpendicular to the propagation direction) and TM (transverse magnetic mode with the magnetic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01
CPCG02F1/0136
Inventor 恽斌峰陈文鑫胡国华崔一平
Owner SOUTHEAST UNIV
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