Multi-point optical transmission system
US6392770B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1999 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | May 26, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0298
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Radio base stations subject each code-division multiplex signal to frequency conversion so as to vary each frequency thereof according to the radio base stations and then converts the signal to an optical signal before transmitting the same to a switching station. The switching station multiplexes the optical signals, subjects a signal obtained after multiplexing to optical-electrical conversion, and extracts the code-division multiplex signal from the respective electrical signal obtained after the conversion. Consequently, each signal to be demodulated by demodulating sections includes nothing but the code-division multiplex signal outputted from the radio base stations. Therefore, a code-division multiplex signal outputted from a desired base station is not disturbed by code-division multiplex signals outputted from the other stations as a noise as will be in a conventional system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.