Mode demultiplexer of degenerate mode group based on spatial three-dimensional waveguide

Abstract

The invention discloses a mode demultiplexer of a degenerate mode group based on a spatial three-dimensional waveguide. The mode demultiplexer is characterized in that the mode demultiplexer comprisesa few-mode waveguide and two single-mode waveguides. One end of the first single-mode waveguide is coupled to the few-mode waveguide, and at the coupling position, the axial direction of the first single-mode waveguide is the same as that of the few-mode waveguide; the other end of the first single-mode waveguide is connected with one end of a single-mode straight waveguide through an S-shaped bend waveguide; one end of the second single-mode waveguide is coupled to the few-mode waveguide, and the other end of the second single-mode waveguide is connected with one end of a single-mode straight waveguide through an S-shaped bend waveguide; the other ends of the two single-mode straight waveguides are coupled to one end of a two-mode waveguide, and an included angle formed by connecting lines of circle centers is 90 degrees; a port 1 of the few-mode waveguide receives a few-mode signal in a mixed mode; and the other end of the two-mode waveguide couples the modes LPpqa and LPpqb input into the few-mode waveguide to LP11a and LP11b of the two-mode waveguide correspondingly and then, outputs the modes LP11a and LP11b, wherein p is not equal to 0.

Description

technical field [0001] The invention relates to a demultiplexing structure of a degenerate mode group, in particular to a demultiplexer for separately demultiplexing and recombining a degenerate mode group based on a spatial three-dimensional waveguide, which can be applied to new technologies such as optical fiber communication and optical information processing. Generation information technology field. Background technique [0002] In recent years, in order to meet the capacity requirements of optical fiber communication systems, mode division multiplexing technology has become one of the research hotspots in the field of optical fiber communication, and the mode multiplexer / demultiplexer as one of its key technologies has received extensive attention. Since the crosstalk between the patterns within each pattern group is large, the crosstalk between the pattern groups is very low. Therefore, in the long-distance mode division multiplexing system, it is necessary to use mu...

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Problems solved by technology

However, due to the strict directional coupling conditions between high-order modes and the need to take into account the coupling of the two modes at the same time, it is too difficult to realize the device, the coupling region is long, and the device efficiency is generally low.

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