Apparatus and method for channel monitoring in a hybrid distributed Raman/EDFA optical amplifier
US6441952B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2001 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Jul 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/302
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a hybrid Raman/EDFA optical amplifier that utilizes a first optical detector that generates a first electrical or electronic signal that is proportional the combined optical power of the signal light and the leaked pump laser light, a second optical detector that generates a second electrical or electronic signal that is proportional to the power of the pump laser light and an electronic subtraction circuit that receives the first and second electrical or electronic signals and generates a difference signal that is proportional to only to the optical power of the signal light and insensitive to the power of the Raman pump laser light. The difference signal is utilized by an EDFA control circuit to control and/or adjust the operation of the EDFA based upon changes in the power of the input optical signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.