Optical substrate with light absorbing segments
US5321779A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1992 |
| Grant date | Jun 14, 1994 |
| Priority date | — |
| Expiry date | Nov 6, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/122
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A substrate for use with integrated optical circuits. The substrate includes an input surface and an output surface for respectively receiving light to the substrate and transmitting light from the substrate. Lateral surfaces extend between the input and output surfaces. A light propagation path extends between the input and output surfaces. One or more cavities extend from the lateral surfaces to the interior of the substrate. The boundary between the cavities and the substrate bear an optical absorber. With this configuration, stray light within the substrate, e.g. from the input surface from the declined propagation path is absorbed by the absorbers before it can reflectively be transmitted back to the defined propagation path and output surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.