Optical fiber amplifier having a gain flattening filter
US6414787B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/003
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical fiber amplifier of the erbium type is intended to amplify light signals within a wavelength band, e.g. in the range of 1540-1555 mm. The active optical fiber receives light signals to be amplified and pump light of a first pump wavelength from a pump source. A gain flattening filter is connected in the active optical fiber length. A noise filter is also connected in the active optical fiber, not more closer to the output end of the active fiber the gain flattening filter. The noise filter blocks light waves having wavelengths around the ASE gain peak and the gain filter attenuates wavelengths within the useful signal band in order to produce a flat gain curve. The introduction of the noise filter increases the total amplification of the amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.