Narrowcast optical communication networks and methods
US5457562A · kind A · utility
42Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | May 20, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/291
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Alternative methods and apparatus for introducing narrowcast transmission signals into a fiber optic broadcast network utilizing rare-earth-doped fiber amplifier technology are disclosed. The methods and apparatus include utilizing an existing 1480 nm pumping laser in an erbium-doped fiber amplifier to transmit a narrowcast signal into a 1550 nm broadcast transport fiber. The 1480 nm narrowcast signal is split off from the amplified 1550 nm broadcast signal(s) in order to bypass a 1550 nm optical isolator located at the output of the amplifier and then recombined with the broadcast signal(s) after the isolator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.