Optical module with high reflection isolation and compact size
US7412124B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 2004 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Oct 29, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29383
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Techniques for designing optical devices with high reflection isolation are disclosed. According to one aspect of the devices, a pair of conjugate optical filters is used. To preserve the performance of the filters and minimize insertion loss, a lens has a first side and a second side, the first side being preferably perpendicular to an optical axis of the lens, and the second side being nearly perpendicular to the optical axis of the lens. Thus one of the conjugate optical filters is deposed towards the first side of the lens and the other one of the conjugate optical filters is deposed towards the second side of the lens. When a reflected light from one filter, presumably carrying residuals of a transmitted signal, hits another filter, the residuals are blocked, resulting in great isolation for the R-channel from the T-channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.