A kind of arrayed waveguide grating with double-layer structure

Abstract

The invention discloses an arrayed waveguide grating with a double-layer structure. The arrayed waveguide grating includes an input star coupler (including an input channel waveguide, an input slab waveguide and an input transition waveguide), an array waveguide and an output star coupler ( Including the output channel waveguide, the output slab waveguide and the output transition waveguide, the array waveguide is respectively connected with the input star coupler and the output star coupler to reduce the scattering loss by the input transition waveguide and the output transition waveguide. The double-layer structure of the present invention Compared with the traditional single-layer AWG, AWG combines the advantages of strong confinement waveguide (Δ>25%) and weak confinement waveguide (Δ<25%), which is expected to reduce the size of the device while ensuring the performance of AWG devices , which provides feasibility for on-chip integration and commercialization of AWG devices.

Description

technical field [0001] The invention belongs to the field of wavelength division multiplexing application systems in optical fiber communication, and in particular relates to a double-layer arrayed waveguide grating. Background technique [0002] Nowadays, optical communication systems have been widely used, and in order to maximize the communication capacity of optical fiber systems, wavelength division multiplexing (WDM) systems using multi-carrier wavelengths emerged as the times require. The key device in the WDM system is the wavelength multiplexer / demultiplexer. A multiplexer combines all wavelength channels on a single fiber, while a demultiplexer separates wavelengths from a single fiber into multiple wavelength channels. [0003] Arrayed waveguide gratings are key devices for multiplexing / demultiplexing and wavelength routing functions in WDM systems. Common array waveguide gratings (array waveguide gratings, AWGs) include silicon dioxide and silicon-based AWGs, wh...

AI Technical Summary

Problems solved by technology

[0003] Arrayed waveguide gratings are key devices for multiplexing / demultiplexing and wavelength routing functions in WDM systems. Common array waveguide gratings (array waveguide gratings, AWGs) include silicon dioxide and silicon-based AWGs, which represent low-refractive index-based The AWG of the differential waveguide and the AWG based on the high refractive index difference waveguide, although the AWG based on the high refractive index difference waveguide benefits from the nanoscale waveguide size and the micron-scale bending radius, it can achieve a very small device size, but the disadvantage is that it needs to Guaranteeing the working performance of AWG requires very high resolution fabrication technology, usually with high insertion loss and high crosstalk

Based on the AWG with low relative refractive index difference, although the device performance is very good, the fatal thing is that the device size is very large, even reaching the centimeter level.

Images