Optical wavelength filtering apparatus with depressed-index claddings
US6563995B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Apr 2, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/094007
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus and a method for separating a light of a first wavelength &lgr;1 from a second wavelength &lgr;2, where &lgr;1<&lgr;2, in a waveguide such as an optical fiber is described. The apparatus includes a core surrounded by a depressed cladding, which itself is surrounded by a secondary cladding. The core cross-section, the depressed cladding cross-section, the secondary cladding cross-section, and the refractive indices of the core, the depressed cladding and the secondary cladding are selected to produce a fundamental mode cutoff wavelength &lgr;c such that &lgr;1&lgr;c<&lgr;2, and produce a high loss at the secondary wavelength &lgr;2. The apparatus can be used as a filter, an amplifier, a laser, or in a nonlinear optical switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.