Multi-pass configurations
US6870679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2002 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Dec 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29398
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and device is disclosed for relaying a narrow diameter collimated optical beam carrying optical communication signal channels between a multilayer interference filters and another reflective surface avoiding signal loss by routing the optical beam to compensate for beam broadening caused by the multilayer interference filter. The method and device are particularly applicable to dispersion compensating filters, especially those wherein one filter is tunable, in that a controllable amount of dispersion is introduced to offset or compensate dispersion. Preferably one of the filters is a tunable periodic device in the form of a multi-cavity etalon structure. In a preferred embodiment of the filters can be designed to provide various controllable but different constant amounts of dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.