A grating-assisted polarizer based on reverse coupling principle
A technology of reverse coupling and polarizers, which is applied in the field of integrated optics and silicon-based photonics, can solve the problems of large insertion loss of polarizers, small bandwidth, and reduced performance of photonic integrated systems, achieving low insertion loss and large bandwidth , easy to integrate and extend effects
Active Publication Date: 2020-12-08
SOUTHEAST UNIV
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However, the insertion loss of polarizers with these structures is large and the bandwidth is small, which will reduce the performance of the entire photonic integrated system
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[0019] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0020] Such as figure 1 As shown, the present invention is a grating-assisted polarizer based on the principle of reverse coupling, including a substrate 4 on which a grating strip waveguide 3 is arranged; hybrid plasma waveguides 1 and 2 with the same structure; hybrid plasma waveguides 1 and 2; From top to bottom, waveguides 1 and 2 are metal covering layers 1-3 and 2-3, silicon dioxide layers 1-2 and 2-2; silicon waveguide layers 1-1 and 2-1; both sides of grating strip waveguide 3 The grating teeth have a displacement difference of half a period; the grating strip waveguide 3 is a silicon waveguide; the thickness of the grating strip waveguide 3 is the same as that of the silicon waveguide layers 1-1 and 2-1.
[0021] Wherein, the size, period and duty cycle of the grating teeth on both sides of the grating bar w...
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The invention discloses a grating-assisted polarizer based on a reverse coupling principle. The grating-assisted polarizer comprises a substrate, a grating strip waveguide and two mixed plasma waveguides with the same structure, wherein the grating strip waveguide and the two mixed plasma waveguides with the same structure are arranged on the substrate; the two mixed plasma waveguides with the same structure are symmetrically positioned on two sides of the grating strip waveguide, and each of the two mixed plasma waveguides comprises a metal covering layer, a silicon dioxide layer and a silicon waveguide layer from top to bottom; the thickness of the grating strip waveguide is the same as the thickness of the silicon waveguide layer; grating teeth are formed on the two side faces, facing the mixed plasma waveguides, of the grating strip waveguide respectively; and the grating teeth on the two side faces have a displacement difference of half a cycle. The polarizer is simple in structure, compact in size, large in working bandwidth and easy in preparation.
Description
technical field [0001] The invention belongs to the technical field of integrated optics and silicon-based photonics, in particular to a grating-assisted polarizer based on the principle of reverse coupling. Background technique [0002] In recent years, on-chip photonic interconnection technology (Photonic Integrated Circuits, PICs) based on silicon photonics has received widespread attention from researchers. PICs can integrate photonic devices with different functions on the same substrate material, which reduces the size of the chip and reduces power consumption, thereby realizing an ultra-compact photonic circuit on the chip. As an important research direction of silicon photonics, silicon-based integrated photonic devices have made great progress, and various new types of silicon-based integrated photonic devices with different functions have been continuously reported. [0003] Polarizer is an important optical device in the field of silicon photonics integration. At...
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IPC IPC(8): G02B6/122G02B6/124G02B6/126
CPCG02B6/1226G02B6/124G02B6/126
Inventor 孙小菡许正英吕涛
Owner SOUTHEAST UNIV