Transmission equipment with an optical transmission line
US5319486A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1991 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Jul 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The transmission equipment includes a plurality of subscriber nodes which are connected serially to an optical fiber. Every node comprises an access unit with at least one directional coupler, an address detection unit, a receiver, a synchronization unit, as well as a control unit with a switching transmitter. Addressed packets continuously reach the nodes and pass through the latter via the fiber in the form of modulated light. In a first switching position, the directional coupler branches off a part of the light power of the packets from the fiber, converts the light in the optoelectrical transducer into electrical signals and reads the respective packet address in the detection unit. If this packet address matches the address of the node the control unit switches the directional coupler into a second switching position. The coupler branches off another part of the light power of the packet in this second switching position and, in so doing, feeds the occurring electrical useful signals to the receiver. The first and second switching positions differ in that a considerably greater proportion of the respective light power is branched off from the fiber in the second position than…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.