Filter optical waveguide with inclination and linear chirp
US6321008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2000 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Jan 24, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02119
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An angled Bragg grating optical waveguide section adjusts the spectral response of a transmission filter in an optical waveguide or in an optical fiber. To smooth the response of the filter, which is subject to modulation due to coupling to the various cladding modes, the pitch of the Bragg grating is caused to vary in a linear fashion along the length of the filter. To adapt the attenuation band to a required band, the cladding of the optical fiber is doped with a photosensitive material so that the grating is also formed in the cladding. The photosensitivity of the cladding is advantageously greater than that of the core, in a ratio in the order of 5:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.