Optical signal transmission system, particularly optical cable television system, with monitoring and service-channel facilities
US5291326A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Mar 20, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2210/078
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for optically transmitting a useful signal (S.sub.1) from a transmitter (1) over a transmission link which includes either an optical waveguide (3) or a fiber-optic network coupled to a receiver (2). The transmitter (1) transmits the useful signal (S.sub.1) and an auxiliary signal (S.sub.2) over the transmission link toward the receiver (2) at different wavelengths. Circuits (4a, 4b, 5, 6, 7) at a desired point in the transmission link and analyze the auxiliary signal (S.sub.2) and provide a response signal (S.sub.3) containing information for monitoring the useful signal. The transmitter (1) receives the response signal (S.sub.3) and controls the further transmission of the useful signal (S.sub.1) and the auxiliary signal (S.sub.2) in accordance with the information in the response signal (S.sub.3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.