Highly efficient focusing waveguide grating coupler using leaky mode
US6999660B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2003 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Jun 20, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a focusing waveguide grating coupler using a leaky mode which can form single output beam while relieving the dependency on manufacturing processes. The focusing waveguide grating coupler of the present research includes: a substrate having a first refraction index n1; a first core layer having a second refraction index n2, the first core layer being formed on the substrate; a second core layer having a third refraction index n3, the second core layer being formed on the first core layer apart from the first core layer with a space d in between; a first cladding layer having a fourth refraction index n4, the first cladding layer being formed on the second core layer; a second cladding layer having a fifth refraction index n5, the second cladding layer being formed on the first cladding layer and inserted between the first core layer and the second core layer; and a Fresnel lens positioned on the second cladding layer, wherein the refractive indexes satisfy conditions of n5>(n2, n3)>n1 and n5>n4; and light inputted through the first and second core layers to the Fresnel lens as radiated leaky beam by a leaky mode formed according to the conditions, and the leaky beam for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.