Patent · US Expired

Laser direct writing of planar lightwave circuits

US6577799B1 · kind B1 · utility

9Cited by

5References

9Claims

0Family size

Assignee

The Australian National University · AU

Inventors

Robbie Charters · Palmerston, AU
Barry Luther-Davies · Gosford, AU
Francois Ladouceur · Sydney, AU

Key dates

Filing date	Mar 2, 2001
Grant date	Jun 10, 2003
Priority date	—
Expiry date	Mar 2, 2021

Classification

Technology area (CPC G)Physics
CPC primaryG02B2006/12107
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A laser beam with an annular or ring shaped intensity distribution, such as a TEM01* beam, is scanned across the surface of a photosensitive thin film to directly produce changes of refractive index in selected regions of the film. This method is suitable for producing channel waveguides for planar lightwave circuits, where the refractive index profile (solid curve) of such a waveguide is more uniform than the prior art refractive index profile (dashed curve) produced by a TEM00 laser beam, and has a reduced bend loss.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.