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...

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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 resonance wavelengths and small filtering bandwidth; the third It is a Bragg grating structure, which uses periodic refractive index perturbation regions to achieve optical filtering functions of different bandwidths, but because it is a two-port device, it cannot simultaneously achieve band-pass and band-stop filtering functions, and the reflection spectrum of light cannot It is extracted by a similar optical fiber looper. If a symmetrical Y bifurcated structure is used, a loss of 6dB will be introduced

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