Method for writing arbitrary index perturbations in a wave-guiding structure
US6035083A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Jul 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/0057
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and an apparatus for writing arbitrary refractive index perturbations along an optical waveguide. The method includes the steps of providing a waveguide having a photosensitive region and providing a writing beam of actinic radiation having a nominal diameter D, the writing beam defining an optical axis. A waveguide is translated relative to the optical axis of the writing beam at a known velocity v(t). A modulator modulates the radiation intensity I(t) of the writing beam as a function of time t to deliver a fluence of radiation, .PHI.(x), directly to the waveguide, wherein ##EQU1## The refractive index change .DELTA.n.sub.(x) at a position x along the waveguide length is related to the fluence delivered to that position as, .DELTA.n.sub.(x) =C.multidot..PHI..sub.(x), wherein C is a scaling factor that accounts for the photosensitivity of the waveguide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.