Wavelength tunable filter and wavelength tunable laser module
US8451872B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2012 |
| Grant date | May 28, 2013 |
| Priority date | — |
| Expiry date | May 11, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/1035
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wavelength tunable filter and a wavelength tunable laser module are a codirectional coupler type whose characteristics do not vary significantly with a process error. They are structured so as to include a semiconductor substrate which has a first optical waveguide and a second optical waveguide. The first and the second optical waveguides are extended from a first side of the semiconductor substrate to an opposing second side thereof. The first optical waveguide includes a first core layer, which has a planar layout having periodic convexes and concaves, and a pair of electrodes, which vertically sandwich the first core layer. The second optical waveguide includes a second core layer, which has a lower refractive index than the first core layer. Further, a layer having the same composition and film thickness as the second core layer is placed under the first core layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.