Etched diffraction grating-type wavelength division multiplexing/demultiplexing device

Abstract

The invention discloses an etched diffraction grating-type wavelength division multiplexing / demultiplexing device. The etched diffraction grating-type wavelength division multiplexing / demultiplexing device includes an input waveguide, output waveguides, a free transmission slab waveguide region and an etched diffraction gratings; the input waveguide and the output waveguides are located at the same side of the free transmission slab waveguide region and are both connected with the free transmission slab waveguide region; the other side of the free transmission slab waveguide region is connected with the etched diffraction gratings; and grating surfaces of the etched diffraction gratings are of two-dimensional photonic crystal reflector structures. According to the etched diffraction grating-type wavelength division multiplexing / demultiplexing device of the invention, the two-dimensional photonic crystal reflector structures are adopted to replace grating surfaces of conventional etched diffraction gratings, and therefore, fabrication technique difficulty of the device can be effectively reduced, and large fresnel reflection loss between a grating medium and an air interface can be effectively decreased, thereby reducing the insertion loss of the device; full reflection of a single polarization mode can be realized, and full transmission of another polarization mode can be realized, and therefore, polarization maintaining of the device is maintained.

Description

technical field [0001] The invention relates to the technical field of optical communication wavelength division multiplexing, in particular to an etching diffraction grating type wavelength division multiplexing / demultiplexing device based on a photonic crystal mirror structure. Background technique [0002] The rapid popularization of the global Internet, the rise of fiber-to-the-home and home office, so that the communication capacity of the backbone network and local area Multiplexing to improve transmission efficiency, improve multiplexing efficiency, and expand transmission capacity is an inevitable choice for realizing large-capacity, high-speed optical fiber communication. The wavelength division multiplexing / demultiplexing device is the most critical device in the wavelength division multiplexing optical fiber communication system, and it is mainly divided into two types: discrete type and planar waveguide integrated type. Arrayed waveguide gratings (Array Waveguid...

AI Technical Summary

Problems solved by technology

At the same time, the Fresnel reflection between the grating medium and the air will also lead to an increase in insertion loss

At present, a metal film is generally coated on the grating surface to achieve total reflection, so as to increase the reflectivity of the grating surface and reduce loss, which increases the complexity of the process

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