An Optical Add-Drop Multiplexer Based on Antisymmetric Multimode Bragg Waveguide Grating

Abstract

The invention discloses an optical add drop multiplexer based on an antisymmetric multimode waveguide Bragg grating. When being input from a single-mode input waveguide, TE light is converted into a base mode of a multi-mode waveguide when passing through an input gradual change waveguide; the antisymmetric multimode waveguide Bragg grating reversely couples incident light meeting the phase matching condition into one step mode of the multi-mode wave guide; reflecting light is converted into a TE mode of a lower-path single-mode waveguide when passing through a lower-path coupling region; transmission light is output from a single-mode output waveguide through the output gradual change waveguide. Identically, the ET light is input from an upper path single-mode waveguide, an upper-path coupling region converts the TE light into the TE one step mode of the multi-mode waveguide; the antisymmetric multimode waveguide Bragg grating reversely couples the incident light meeting the phase matching conditions into a base mode of the multi-mode waveguide; reflecting light is output from the single-mode output waveguide through the output gradual change waveguide. The optical add drop multiplexer has the advantage that the optical signal add drop multiplexing function is realized, and the optical add drop multiplexer can be applied to an on-chip high-density integrated optical interconnection system.

Description

technical field [0001] The invention relates to an optical signal add-drop multiplexing integrated device, in particular to an optical signal add-drop multiplexer based on an antisymmetric multimode Bragg waveguide grating. Background technique [0002] With the rapid development of integrated circuits, the feature size of transistors continues to decrease, and high-speed information inevitably encounters a series of bottlenecks in terms of speed, bandwidth, and power consumption when transmitting electrical interconnections. On-chip optical interconnection based on silicon optics provides a feasible solution to this technical problem, and the exchange of information will be carried out directly on the optical transmission layer. [0003] As a basic functional device of optical interconnection, optical filter can flexibly realize the separation, add and drop of different signals, and is a very important link in dense wavelength division multiplexing optical network. At pres...

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Problems solved by technology

At present, there are three main structures of devices that can realize the add-drop multiplexing function of optical signals: the first is the micro-ring resonator structure, which can provide a high Q value, but it is difficult to achieve a large filtering bandwidth; the second It is a directional coupler structure, which needs to strictly control the beat length, and it is not easy to select the wavelength; the third is the grating-assisted coupling region structure, which uses a periodic refractive index perturbation region to realize the phase mismatch between two waveguides. Energy coupling, but its manufacturing process requires high precision, which is not suitable for commercial production lines

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