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On-chip mode multiplexing and demultiplexing device

A mode demultiplexing and mode multiplexing technology, applied in the field of optical communication transmission, can solve problems such as small processing tolerance, reduced device performance, and increased mode loss

Active Publication Date: 2018-06-22
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the asymmetric directional coupler has a small processing tolerance, which will reduce the performance of the device and increase the loss of the mode

Method used

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  • On-chip mode multiplexing and demultiplexing device
  • On-chip mode multiplexing and demultiplexing device
  • On-chip mode multiplexing and demultiplexing device

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Embodiment Construction

[0042] The present invention will be described in further detail below through specific embodiments and accompanying drawings.

[0043] Below in conjunction with the overall structure of this embodiment figure 1 The implementation of the overall structure is described in detail, figure 1 It includes three parts: mode multiplexing structure, bus waveguide (bus waveguide, a waveguide for transmitting multiple mode signals, which is the carrier of signal transmission in mode division multiplexing system), and mode demultiplexing structure. The bus waveguide can be a waveguide in an integrated device or an optical fiber, depending on the specific application scenario.

[0044] The pattern multiplexing and demultiplexing structure can be completely symmetrical. The specific details of the mode demultiplexer are given by figure 2 illustrate. The structure consists of four stages, each of which consists of a bridge coupler and a corresponding mode converter (the shape is determi...

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Abstract

The invention discloses an on-chip mode multiplexing and demultiplexing device which comprises a plurality of demultiplexing units. Each demultiplexing unit comprises a bridge coupler and a mode converter, each bridge coupler comprises three multimode waveguides A, B and C in parallel placement, a mode m is a highest-order mode in the bridge coupler of an ith demultiplexing unit, the mode m formsa supermode with three effective refractive indexes being an arithmetic progression in the waveguides A, B and C of the bridge coupler of the ith demultiplexing unit, and length of the bridge couplerof the ith demultiplexing unit meets a condition of only outputting the mode m in a coupled manner; the waveguide C of each bridge coupler serving as a mode output end is connected with a mode converter which is used for converting input modes into fundamental modes and outputting the fundamental modes in a coupled manner, and each two adjacent demultiplexing units are connected through the corresponding waveguides A. A multiplexing device is completely symmetric with a demultiplexing structure, but the using method is the other way round. Performance of the mode multiplexing device is improved greatly.

Description

technical field [0001] The invention belongs to the field of optical communication transmission, and relates to an on-chip mode multiplexing and demultiplexing device, a bridge-type coupling structure based on supermode theory, and a mode converter based on an elliptical or semi-elliptical device. Background technique [0002] As the demand for optical communication capacity continues to increase, traditional polarization multiplexing and wavelength division multiplexing have been difficult to meet the growing demand. In recent years, mode multiplexing has been receiving more and more attention. Mode multiplexing adds more dimensions by using several orthogonal eigenmodes in multimode waveguides or optical fibers as carriers for propagating information, thereby increasing communication capacity. [0003] On-chip mode multiplexers have been described in several papers. Usually, the on-chip mode multiplexer adopts the asymmetric directional coupler as the mode multiplexing an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/14G02B6/28
CPCG02B6/14G02B6/2804
Inventor 陈泽宇李艳萍张帆
Owner PEKING UNIV
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