Star coupler with power being uniformly distributed, and arrangement method therefor

Abstract

The invention discloses a star coupler with power being uniformly distributed, and an arrangement method therefor. The star coupler comprises an N*N optical waveguide input ends and optical waveguide output ends, which are all disposed on a silicon chip. The optical waveguide input ends and optical waveguide output ends are symmetrically distributed, wherein a central axis of the optical waveguide input ends and optical waveguide output ends is taken as the axis of symmetry. The intervals between the optical waveguide input ends and the optical waveguide output ends are from 0.5 microns to 2 microns, and the distance from a central light output point of the optical waveguide input ends to the central end part of the optical waveguide output ends is from 2 cm to 3 cm. The widths of optical waveguide free propagation area ports, connected with a free propagation area, of the optical waveguide input ends and the optical waveguide output ends are alpha*W. Through the adjustment of the distance parameters between the optical waveguide input ends and the optical waveguide output ends in the star coupler, light passing through a waveguide open area is enabled to be distributed in a mode of a sinc function, thereby obtaining light distributed in a rectangular manner at the optical waveguide output ends, and completing the uniform distribution of power.

Description

technical field [0001] The invention relates to a star coupler with uniform power distribution and a setting method thereof. Background technique [0002] The most attractive optical network structure is a high-speed, large-scale, multi-access optical network based on passive component N×N star couplers. Here we use N to denote the number of optical channels. In this type of optical network structure, the star coupler plays the role of power distribution for multiple access components [1] . An array of interconnected 3dB couplers can be used as a star coupled [2] . However, when N is very large, the fabrication complexity and optical loss can be prohibitive. Dragnoe et al. [3] A simpler integrated optical star coupler is proposed consisting of an array of waveguides separating the channels by a radiating region, as figure 1 shown. The structure maintains a compact chip size, while the number of channels can be large, but there is an uneven distribution of power, beca...

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Problems solved by technology

[0005] In order to overcome the problem of uneven power distribution of star couplers in the prior art, the present invention proposes a star coupler with uniform power distribution and its setting method. The distance parameter between the output ends is adjusted so that the light passing through the open area of ​​the waveguide is distributed in the form of a Singh function, so that the light distributed in a rectangular shape is obtained at the output end of the waveguide, and the power is evenly distributed.

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