Band-pass and band-stop filter based on anti-symmetric multimode Bragg light guide grating

Abstract

The invention discloses a band-pass and band-stop filter based on an anti-symmetric multimode Bragg light guide grating. When TE light is input from a single-mode input waveguide, an input mode switcher switches the TE light to a TE-based mode of a multi-mode waveguide, the anti-symmetric multimode Bragg light guide grating reversely couples incident light with the wavelength meeting phase matching conditions into a TE first-order mode of the multi-mode waveguide, the mode is switched to a TE mode of a downlink single-mode waveguide when the light passes through a downlink coupling zone, the light is output from the output end of the downlink single-mode waveguide, and transmission light is switched to the TE mode of a single-mode output waveguide through an output mode switcher and is output from the output end of the single-mode output waveguide. The band-pass and band-stop filter simultaneously achieves band-pass and band-stop functions and can be applied to an optical interconnection system adopting on-chip high-density integration.

Description

technical field [0001] The invention relates to an optical filtering integrated device, in particular to a band-pass and band-stop filter 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 being transmitted through 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 filter different signals, and is a very important link in dense wavelength division multiplexing optical network. At present, there are mainly two structures for opti...

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Problems solved by technology

At present, there are mainly two structures for optical filtering devices: the first is the microring resonator structure, which can provide a higher Q value, but it has a series of resonance wavelengths, and the optical filtering is affected by the free spectral width. And can not achieve a large filtering bandwidth; the second is the Bragg waveguide grating structure, which uses the periodic refractive index perturbation region, which can realize the optical filtering function of different bandwidths, but because it is a two-port device, it cannot realize the reflection spectrum. Direct extraction, and reflected light will also cause instability of the light source

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