Variable optical attenuator having a linear response
US6256446A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Apr 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/3825
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable attenuator includes a rotatable actuator and cam arrangement arranged to vary a length of an air gap between ends of fibers in a transmission line. The cam arrangement includes a cylindrically shaped cam member having an end surface cut to fit a curve representing normalized attenuation-to-gap-length data, the cam follower(s) being fitted in a sliding member that holds the end of the optical fiber and moves it relative to a fixed end of another fiber connector member. The cam surface includes multiple identical cam surface sections extending less than 180.degree. around the cam to define movement of the cam follower(s) and the sliding member between a maximum position and a minimum position. The cam surface sections may be connected by ramps that permit a pair of cam followers to move from the maximum position to the minimum position and back in a continuous path that allows an actuator to be turned beyond the maximum and minimum positions and automatically reset without damage to any of the components of the attenuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.