Few-mode fiber degenerate mode group demultiplexer based on fused biconical taper and manufacturing method thereof

A technology of few-mode fiber and demultiplexer, which is applied in the field of few-mode fiber degenerate mode group demultiplexer, can solve the problems of large volume, poor mechanical stability and thermal stability, and high cost, and achieve high coupling efficiency Effect

Active Publication Date: 2018-10-09
PEKING UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

This method is difficult to process, has poor mechanical stability and thermal stability, and is large in size and high in cost, so it cannot be mass-produced

Method used

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  • Few-mode fiber degenerate mode group demultiplexer based on fused biconical taper and manufacturing method thereof
  • Few-mode fiber degenerate mode group demultiplexer based on fused biconical taper and manufacturing method thereof

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Embodiment Construction

[0025] LP 21 The manufacturing method of the degenerate mode group demultiplexer is taken as an example to illustrate the present invention in detail. The few-mode fiber in this example is a four-mode fiber.

[0026] figure 2 Make an installation diagram for the demultiplexer of the degenerate mode group. The device is mainly composed of two parts. The first part is a mode generation part, which is composed of a continuous power laser, a 1×4 optical switch, a four-mode mode multiplexer and a mode rotator. Among them, the four-mode mode multiplexer has four single-mode input terminals, corresponding to LP 01 , LP 11 , LP 21 , LP 02 Four modes, the output end is a four-mode fiber. Continuous laser is used to launch the fundamental mode LP in single mode fiber 01 The continuous laser is connected to one of the single-mode input ends of the four-mode multiplexer through a 1×4 optical switch, and a mode in the four-mode fiber is excited at the output end of the multiplexer. After t...

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Abstract

The invention discloses a few-mode fiber degenerate mode group demultiplexer based on a fused biconical taper and a manufacturing method thereof. The demultiplexer provided by the invention comprisesa few-mode fiber arm and a two-mode fiber arm. The middle part of the few-mode fiber arm and one end of the two-mode fiber arm are fused to form a coupling region. One end of the few-mode fiber is denoted as a port 1, and the other end is denoted as a port 2. The other end of the two-mode fiber is denoted as a port 3. The port 2 and the port 3 are located on the same side of the coupling region. Adegenerate mode group to be demultiplexed is injected from the port 1, is transferred to the LP11 degenerate mode group of the two-mode fiber, and is output from the port 3. Other modes injected fromthe port 1 are directly output from the port 2. The few-mode fiber degenerate mode group demultiplexer provided by the invention is capable of achieving a better demultiplexing effect for a non-circular symmetric degenerate mode group.

Description

Technical field [0001] The present invention relates to the technical field of optical fiber passive device manufacturing, in particular to a few-mode optical fiber degenerate mode group demultiplexer based on fusion tapered optical fiber coupler technology and a manufacturing method thereof. Background technique [0002] In order to solve the problem of the shortage of single-mode optical fiber communication system, the mode division multiplexing optical communication system has been extensively studied. Since it can provide a new physical dimension, the MDM technology can greatly increase the capacity of the optical communication system. In long-distance modular multiplexing systems, it is always necessary to use MIMO digital signal processing technology to eliminate crosstalk between modes. For short-distance transmission scenarios such as data centers, pattern group multiplexing technology can be used. Since the crosstalk between the modes in each mode group is large, but t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293G02B6/255
Inventor 李巨浩高宇洋何永琪陈章渊
Owner PEKING UNIV
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