Bit synchronization for optical networks
US4982446A · kind A · utility
10Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1988 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Jul 12, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/027
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A submarine optical telecommunications system has two shore based transmitting stations whose signals are combined at a passive, submerged junction. Phase errors are caused by variations in transmission times to the junction. An error signal is generated at the first repeater after the junction. The error signal, which represents the phase errors, is transmitted to a shore station where it is used to adjust the sending phase. A surface acoustic wave filter tuned to half the frequency of the combined signal is the preferred way to generate the error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.