Add/drop filter based on antisymmetric multimode Bragg waveguide grating

Abstract

The invention discloses an add/drop filter based on an antisymmetric multimode Bragg waveguide grating. When TE light is input from a single-mode input waveguide, a drop asymmetric Y-branch waveguide converts the TE light into a TE fundamental mode of a multimode waveguide; the antisymmetric Bragg waveguide grating carries out back-coupling on the incident light meeting phase matching condition wavelength to form reflected light; the reflected light is converted into a TE mode of a drop single-mode waveguide when passing through the drop asymmetric Y-branch waveguide, and the TE mode is output from the drop end; transmission light passes through an add asymmetric Y-branch waveguide and is output from a single-mode output waveguide; similarly, add light is input from an add single-mode input waveguide; the add asymmetric Y-branch waveguide converts the add light into a TE first-order mode of the multimode waveguide; and the antisymmetric Bragg waveguide grating enables the reflected light meeting the phase matching condition wavelength to be converted into a TE mode of the single-mode output waveguide when the reflected light passes through the add asymmetric Y-branch waveguide, and the TE mode is output from the output end. The add/drop filter realizes signal adding/dropping function, and can be applied to an on-chip super-integrated optical interconnection system.

Description

technical field [0001] The invention relates to an optical add-on and drop-path filter integrated device, in particular to an add-on-drop filter based on an antisymmetrical 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 present, there are t...

AI Technical Summary

Problems solved by technology

At present, there are three main structures of devices that can realize the optical add and drop filtering function: the first is the microring resonator structure, which can provide a higher Q value, and it does not require two reflective end faces, but it has a series of resonances Wavelength, the filtering of light is affected by the free spectral width, and the filtering bandwidth is small; the second is the F-P cavity structure, which requires two reflective end faces, and has a series of reson

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