Compact Bragg reflector type concave diffraction grating wavelength division multiplexer and designing method thereof

Abstract

The invention discloses a compact Bragg reflector type concave diffraction grating wavelength division multiplexer and a designing method thereof. The compact Bragg reflector type concave diffractiongrating wavelength division multiplexer includes an MZI interleaving filter, two input waveguides, a Bragg reflector-type concave diffraction grating, a free transmission region and two output waveguide arrays. The designing method includes that firstly the incident angle relationship between the two input waveguides relative to the grating tooth surface is determined according to the angular dispersion relationship of the Bragg reflector-type concave diffraction grating; secondly, structural parameters of the MZI interleaving filter are determined by a designed concave grating wavelength interval; and finally the designing of the compact Bragg reflector type concave diffraction grating wavelength division multiplexer design cascaded with the MZI interleaving filter is realized. Compared with the conventional concave diffraction grating wavelength division multiplexers, the odd and even channel light outputted by the MZI interleaving filter are respectively incident on the diffractiongrating at different angles, and the output light frequency of the wavelength division multiplexer is halved using the MZI interleaving filter at an interval, the circumferential length of the Rolandcircle is fully utilized, the size of the device is effectively reduced, and the complexity of the process is lowered.

Description

【Technical field】 [0001] The invention belongs to the technical fields of optical communication and optical detection, and relates to a compact Bragg reflector type concave diffraction grating wavelength division multiplexer and a design method thereof. 【Background technique】 [0002] As an important device in the field of optical communication and optical detection, wavelength division multiplexer is widely used in optical communication expansion, gas detection, etc. The planar optical waveguide type wavelength division multiplexer is conducive to the miniaturization and integration of devices, and is the mainstream development direction of the wavelength division multiplexer. Planar waveguide type wavelength division multiplexer mainly includes arrayed waveguide grating (Arrayed Waveguide Grating, AWG), etched diffraction grating (Etched Diffraction Grating, EDG), and Bragg reflector type concave diffraction grating as a new type of EDG, because of its Small size, high di...

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Problems solved by technology

All of the above studies have only one input waveguide, which does not make full use of the circumference of the Rowland circle. To achieve dense wavelength division multiplexing, they all face the problem of greatly increasing the size of the device.

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