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Method for flattening output spectra of arrayed waveguide grating

An arrayed waveguide grating and flattening technology, applied in optics, optical components, instruments, etc., can solve the problems of narrow 3dB bandwidth, demodulation performance affected by temperature changes and wavelength drift, and achieve high design freedom, low cost, and structural design simple effects

Inactive Publication Date: 2013-09-04
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0006] The purpose of the present invention is: to provide a method for flattening the output spectrum of an arrayed waveguide grating, to solve the problem that the 3dB bandwidth in the output spectrum of an ordinary arrayed waveguide grating is relatively narrow, and the demodulation performance is affected by factors such as temperature changes and wavelength drift. It will further promote the wide application of arrayed waveguide gratings in demodulation systems

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  • Method for flattening output spectra of arrayed waveguide grating
  • Method for flattening output spectra of arrayed waveguide grating
  • Method for flattening output spectra of arrayed waveguide grating

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Embodiment Construction

[0019] The best embodiment of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0020] The structure schematic diagram of the arrayed waveguide grating output spectrum flattening method proposed by the present invention is as attached figure 1 shown. A tapered multimode waveguide structure is inserted before the input slab waveguide of the arrayed waveguide grating, and its optimal design parameters include the exit distance W O , entrance width W I , length L MMI and cone angle a. In order to increase design freedom and reduce crosstalk, a tapered waveguide is inserted before the tapered multimode waveguide and after the arrayed waveguide grating output slab waveguide, with a width of w i and w o .

[0021] According to the above structural analysis, the two structural parts of the planarization method are the tapered multimode waveguide part and the two tapered pre-broadening parts.

[0022] 1....

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Abstract

The invention discloses a method for flattening the output spectra of an arrayed waveguide grating. The method adopts a design combining tapered multimode waveguides and input / output waveguides in a tapered to-be-widened structure. The method is characterized in that the tapered multimode waveguides are connected to the tail ends of the input waveguides, and one section of tapered to-be-widened waveguides is inserted respectively before the tapered multimode waveguides and after the output panel waveguides of the arrayed waveguide grating. The method for flattening the output spectra of the arrayed waveguide grating has the advantages of higher design freedom, capability of obtaining the flattened spectra of low chromatic dispersion, lower output crosstalk and low losses. Meanwhile, 3dB bandwidth can be increased to more than 60% of the original channel spacing after spectra flattening.

Description

technical field [0001] The invention belongs to the technical field of planar optical waveguide integration, and in particular relates to a method for flattening the output spectrum of an arrayed waveguide grating. Background technique [0002] At present, the research on fiber grating sensing has made great progress, and it can be used to measure strain, temperature, pressure and all physical quantities that can be converted into strain or temperature. However, the fiber grating demodulation system is large in size and expensive, which limits its popularization and application. field. The fiber Bragg grating demodulation method based on arrayed waveguide grating is a new type of fiber Bragg grating demodulation method with great potential, which has the characteristics of high precision and fast demodulation speed. [0003] In the arrayed waveguide grating demodulation system, the arrayed waveguide grating is one of the important devices. The spectral response of the ordin...

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Application Information

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IPC IPC(8): G02B27/00
Inventor 李鸿强白曜亭董夏叶李洋
Owner TIANJIN POLYTECHNIC UNIV
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