Method of providing duplex optical communications and optical modulator therefor
US8135286B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2006 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Dec 31, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/1125
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods of providing duplex free-space optical, communication comprising receiving a time-shift keying (TSK) encoded signal and selectively re-modulating—and optionally retro-reflecting —received TSK pulses so as to transmit an on-off keying (OOK) signal wherein modulation is achieved by operating a micro-opto-electronic mechanical system (MOEMS) device having a oscillation period, the difference in timing between logic 1 and logic 0 pulses of the TSK encoded signal being such that each pulse arrives at a time within a single MOEMS device oscillation period chosen to ensure high or low transmissivity through the MOEMS device independent of incident TSK encoded signal pulse value (0 or 1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.