Single fiber Sagnac interferometer based secure communication system
US6690890B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Mar 8, 2000 |
| Grant date | Feb 10, 2004 |
| Priority date | — |
| Expiry date | Mar 8, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The system includes a generally broadband, low coherence length light source that injects light into a fiber beamsplitter that is used to generate counterpropagating light beams in a Sagnac loop. The loop includes two facing fiber beamsplitters connected together at differing length inner legs, with one of the output legs of the second beamsplitter usually being connected to a in place optical fiber that ends with a phase modulator followed by a mirror. Formatted data is transmitted by impressing relative phase differences between the counterpropagating light beams. Optimum performance depends on appropriate choices for critical lengths in the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.