LATENT REFERENCES / TAG2
Grating Coupler
Original title: グレーティングカプラ
This reference note belongs to Tag2 in Latent References, an archive curated by Keigo Yoshida. Its archive region is Physics. The note preserves its source text and links so that readers can trace the material behind the 3D map.
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A grating coupler efficiently couples optical fibers with SOI waveguides on silicon substrates.
By giving a substrate waveguide a suitable periodic structure resembling a diffraction grating, light incident from an optical fiber is diffracted into the substrate waveguide to couple the light.
In grating-coupler design, incident light is a fiber mode, so design must consider the mode distribution. This is addressed by locally modulating diffraction-grating characteristics to match the effective refractive-index distribution and mode distribution (apodization).
https://scrapbox.io/files/65d3face6971d40024459169.png
#physics
グレーティングカプラは、光ファイバとシリコン基板上のSOI導波路を効率的に結合するためのデバイスです。
基板導波路に回折格子状の適切な周期構造を与えることによって、光ファイバから入射した光を基導波路板内に回折させ、光を結合します。
グレーティングカプラの設計では、入射光はファイバモードとなるため、モード分布を考慮した設計が必要です。 これを考慮するために、回折格子の特性を局所的に変調させ、実効屈折率分布とモード分布を整合させる方法(アポダイゼーション)が取られます。
https://scrapbox.io/files/65d3face6971d40024459169.png
#physics
Source updated 2024-08-06 · Snapshot 2026-10-08
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