Optical signal demodulators
US7259901B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2003 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Feb 27, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/223
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An optical signal demodulator for demodulating an M-ary phase shift key (PSK) optical signal comprises a plurality of interferometers arranged such that the optical signal is divided between the interferometers. Each interferometer comprises a plurality of interferometer arms, each arm for transmitting a portion of the signal between an input and an output of the interferometer, the interferometer including an optical delay in one arm relative to another arm thereof. The optical delay between arms of an interferometer may be provided by an optical path length difference between the arms. The optical delay between arms of an interferometer may be different for one interferometer to that of another interferometer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.