Long-length continuous phase Bragg reflectors in optical media
US6404956B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1998 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Sep 28, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/0057
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A long length continuous phase Bragg reflector and the method and an apparatus for writing the gratings into an optical fiber. The method includes the steps of providing a photosensitive optical fiber and a writing beam. A periodic intensity distribution of period &Lgr; is created from the writing beam and the optical fiber is translated relative to the intensity distribution at a velocity v(t). The intensity of the writing beam is modulated as a function of time at a frequency f(t), where. v(t)/f(t)≈&Lgr;. The intensity of the writing beam is varied further to control the envelope of the refractive index profile to write apodized gratings. The gratings measure at least 2.5 meters in length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.