Raman amplified optical system with reduction of four-wave mixing effects
US6697558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Dec 2, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2563
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmission fiber for use in a Raman amplified optical communication system is formed to exhibit certain characteristics that limit modulation instability and four-wave mixing in the amplification region, thus reducing the noise component present in the transmission system. In particular, the group-velocity dispersion (denoted as D and measured in terms of ps/nm-km) is restricted to be either non-positive or greater than +1.5 ps/nm-km in the pump wavelength range of interest (a typical pump wavelength range being 1430-1465 nm). Preferably, the magnitude of the dispersion is kept below a value of 10 ps/nm-km in the signal wavelength range of interest (e.g., the “C” band or “L” band). Four-wave mixing is reduced by ensuring that the zero-dispersion frequency of the transmission fiber is not centered between the pump frequency and a frequency experiencing Raman gain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.