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Method for converting polarization state of optical signal by 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: 2021-04-09
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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  • Method for converting polarization state of optical signal by silicon-based polarization rotator
  • Method for converting polarization state of optical signal by silicon-based polarization rotator
  • Method for converting polarization state of optical signal by silicon-based polarization rotator

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Embodiment Construction

[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 the silicon-based polarization rotator of the present invention is as follows: the silicon-based polarization rotator includes successively cascaded mode converters and asymmetric multimode waveguide gratings, and the mode converter consists of a three-stage tapered Waveguides are cascaded;

[0022] 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 waveguid...

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Abstract

The invention provides a method for converting the polarization state of an optical signal by a silicon-based polarization rotator, the silicon-based polarization rotator comprises a mode converter and an asymmetric multimode waveguide grating which are cascaded in sequence, and the mode converter is formed by cascading three stages of conical waveguides; the mode converter converts a transverse magnetic mode fundamental mode, namely a TM0 mode, with the magnetic field direction perpendicular to the propagation direction of an input optical signal into a first-order transverse electric mode, namely a TE1 mode, with the electric field direction perpendicular to the propagation direction, outputs the first-order transverse electric mode to the asymmetric multimode waveguide grating, and converts the TE1 mode reflected back from the asymmetric multimode waveguide grating into the TM0 mode; wherein the transmission of a transverse electric mode fundamental mode, namely a TE0 mode, of which the electric field direction of the input optical signal is perpendicular to the propagation direction does not change the polarization state; the asymmetric multimode waveguide grating reflects a TE0 mode output from the mode converter into a TE1 mode, inputs the TE1 mode into the mode converter, converts the TE1 mode into a TM0 mode, reflects the TE1 mode output from the mode converter into the TE0 mode, inputs the TE0 mode into the mode converter, and the polarization state is not changed.

Description

technical field [0001] The invention relates to a silicon-based photon 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) technology is considered to be the most promising for large-scale photonic integration due to its high integration and CMOS process compatibility. It is expected to be used in optical communications, data centers, high-performance Computers, biosensing, quantum information processing and other fields play an important role. In silicon-based integrated optical passive devices, integrated polarization rotators are of great significance in many aspects because they can control the polarization state. [0003] On the one hand, silicon-based optical waveguides usually support TE (transverse electric mode in which the electric field direction is perpendicular to the propagatio...

Claims

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Application Information

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Patent Type & Authority Applications(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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