Controllably variable optical attenuator
US6674953B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2002 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jan 2, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A controllable attenuator includes a pair of collimators respectively connected to input and output fibers. A pair of reflection devices are respectively positioned behind the pair of collimators opposite to the corresponding input and output fibers. A U-like light path is defined among the pair of collimators and the pair of reflection devices. A neutral density filter is moveably positioned between the pair of reflection devices wherein a moving direction of the filter is preferably parallel to a longitudinal direction of the pair of collimators. An ND filter position indicator such as a potentiometer, is used to dynamically monitor attenuation setting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.