Telecommunications system having fiber optical amplifiers for transmitting signals over long distances
US5251061A · kind A · utility
0Cited by
3References
2Claims
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Assignee
Inventors
Key dates
| Filing date | Apr 22, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Apr 22, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2912
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telecommunications system having erbium-doped fiber optical amplifiers for transmitting signals including at least one signal at a wavelength of about 1550 nm, wherein the amplifiers are fibers whose cores are doped with erbium and germanium and are free from aluminum; and wherein for each of the amplifiers, the length of the fiber and the pumping power which is injected therein are such that the noise generated by the fiber is generally emitted around 1550 nm. As can be seen in FIG. 4 , the signal-to-noise ratio remains satisfactory after 10,000 km of propagation without using an intermediate filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.