Chromatic dispersion compensation
US6381388B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Oct 17, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29376
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical waveguide provided with a linearly chirped Bragg reflective grating can be employed as a device that provides linear dispersion compensation. The amount of the linear dispersion thereby provided can be rendered adjustable by adjustment of the magnitude of axial strain imposed upon the grating. If the chirp is purely linear, and if also, the strain is at all times uniform along the length of the grating, adjustment of the strain magnitude will have no such effect. This requires the presence of a quadratic chirp term, but such a term introduces its own transmission penalty. This penalty is compensated at least in part by causing the light to make a reflection in a second Bragg reflection grating identical with the first, but oriented to provide a quadratic component of chirp that has the opposite sign to that of the first Bragg reflection grating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.