Method for realizing smooth output of array light-guide grating by 3dB coupling wave

Abstract

The invention relates to a method for flattening the output of an array waveguide grating by 3dB coupling waveguide, characterized in comprising the steps of: 1. taking an array waveguide grating; 2. adding a 3dB coupling waveguide at the end of the input end of the array waveguide grating, so that the 3dB coupling waveguide and the input waveguide in the array waveguide grating compose a 3dB coupler so as to flatten the output spectrum of the array waveguide grating.

Description

technical field [0001] The invention relates to an arrayed waveguide grating (AWG) device, in particular to a method for flattening the output of the arrayed waveguide grating by a 3dB coupling waveguide. Background technique [0002] The output spectrum of an ordinary arrayed waveguide grating is Gaussian distribution with narrow bandwidth. In the optical network, the Gaussian output spectrum has strict requirements on lasers and detectors. In order to relax the requirements on lasers and detectors, the output spectrum of arrayed waveguide gratings should be is flattened. [0003] At present, the methods for flattening the output of arrayed waveguide gratings in the world include: using a multimode interferometer (MMI) at the end of the input waveguide of the arrayed waveguide grating, arraying waveguides using two sets of arrayed waveguides with different length differences, and multi-roland circle design ( See literature: [1] M.Kohtoku, H.Takahashi, T.Kitoh, T.Shibata, Y...

AI Technical Summary

Problems solved by technology

However, adding a 3dB coupling waveguide at the end of the input waveguide to achieve the flattening of the output spectrum of the arrayed waveguide grating has not been reported internationally.

Images