Quadrature modulator with feedback control and optical communications system using the same
US8050351B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2007 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Apr 10, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The method and system are disclosed for automatic feedback control of integrated optical quadrature modulator for generation of optical quaternary phase-shift-keyed signal in coherent optical communications. The method comprises the steps of detecting at least a part of an output optical signal from the QPSK modulator, extracting of a particular portion of the output signal in frequency domain, and processing the signal in frequency domain to optimize the transmission of an optical link. The system and method of optical communications in fiber or free space are disclosed that implement the quadrature data modulator with automatic feedback control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.