Gain controlled optically pre-amplified receiver apparatus and method
US6490080B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2000 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Dec 22, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/1001
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical amplifier is added to the input of a photodetector to perform optical pre-amplification of an input optical signal before it is converted to an electrical signal by the photodetector. A controller utilizes a received power level to control a pump power level of a pump injecting pumping light into the optical amplifier. The pump power level is controlled in order to control the optical gain of the optical amplifier. The received power level may be measured by a receiving device that includes the photodetector and a power measuring device. The pump output power level may also be fed back to the controller to monitor the pump. A dual pass EDFA may be used as the optical amplifier and coupled to a selector to save space and reduce noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.