Secure optical communication
US7796896B2 · kind B2 · utility
17Cited by
93References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2004 |
| Grant date | Sep 14, 2010 |
| Priority date | — |
| Expiry date | Feb 24, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/00
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A secure optical communication scheme uses differential delay D in an unbalanced Mach-Zehender interferometer to provide two copies of the optical source signal at a remote phase modulator separated in time by D. As D is much bigger than the coherence time source, the two copies of the signal are effectively uncorrelated. Both signals are phase-modulated by the remote sender's data and returned to the unbalanced interferometer. The phase modulator will be converted into amplitude modulation by the action of the interferometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.