Method to reduce light propagation losses in optical glasses and optical waveguide fabricated by same
US5235662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Jan 2, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a method of annealing optical glass layers, said method comprising the step of heating glass layers having an area greater than 0.01 cm.sup.2 to a temperature of between about 350 deg. C. and 1000 deg. C. in less than 10 minutes. The upper limit of the glass area that can be treated is limited only by the size of the quartz chamber. Current state-of-the-art chambers can accomodate glass areas of about 0.01 cm.sup.2 to about 324 cm.sup.2. According to another aspect of the invention, there is also provided an optical waveguide glass layer, treated according to the method of this invention, disposed on an integrated optical device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.