Optical amplifiers with variable optical attenuation for use in fiber-optic communications systems
US6377396B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2000 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Nov 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/06758
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Optical amplifiers with variable optical attenuators that are adjusted using a sublinear control scheme are provided. Instead of increasing the attenuation of the optical attenuator by Y dBs for each desired Y dBs in decreased optical amplifier gain, the attenuation of the variable optical attenuator is increased by less than Y dBs. This sublinear control scheme improves the noise figure performance of the optical amplifier at the expense of increased gain ripple. The overall performance of the optical amplifier may be improved, particularly in conditions in which the attenuations produced by the variable optical attenuator are relatively large.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.