Optical transmission device using a wide input dynamic range optical amplifier
US7248804B2 · kind B2 · utility
4Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2004 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Jul 24, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2931
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Conventionally, an adjustment of an optical power level of an input Pin of an optical amplifier module is made with an optical variable attenuator. An optical coupler for measuring the optical power level of Pin and an optical variable attenuator are replaced by a variable optical coupler. The branch ratio of the variable optical coupler is varied, whereby the input optical power level Pin to an optical amplifier module is adjusted. As a result, an optical loss is reduced by an amount corresponding to the elimination of the optical attenuator, and also the OSNR of the optical amplifier module is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.