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

A technology of band-stop filter and waveguide grating, which is applied in the direction of light guide, optics, instrument, etc., can solve the problems of unstable light source, inability to realize direct extraction of reflection spectrum, inability to realize large filter bandwidth, etc., and achieve compatibility with CMOS technology, Easy to integrate and expand, compact effects

Inactive Publication Date: 2016-07-13
LONGYAN UNIV
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  • Application Information

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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

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

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Embodiment

[0039] Such as figure 1 , figure 2 and Figure 4 As shown, the silicon-on-insulator (SOI) material with a top silicon thickness of 220nm and a silicon oxide buried layer of 2 μm is used. After the wafer surface is cleaned, deep ultraviolet lithography or electron beam direct writing lithography is performed to obtain a silicon etching mask. film, through silicon dry etching, to produce a strip waveguide with a height of 220nm, in which the width of the single-mode waveguide is 450nm, and the width of the multi-mode waveguide is 900nm. The grating, the rectangular grating tooth is 150nm, its period is 310nm, and the length of the Bragg waveguide grating is 300μm.

[0040] The grating period parameters in the above embodiments are designed for multimode strip waveguides with an operating wavelength of 1550nm and a width of 900nm. The device is also suitable for multimode strip waveguides with other operating wavelengths and widths, and is also suitable for devices with differen...

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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...

Claims

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Application Information

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IPC IPC(8): G02B6/293
CPCG02B6/29316
Inventor 邱晖晔赖国忠梁雄
Owner LONGYAN UNIV
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