Method and apparatus for phase shift keyed optical communications
US9264147B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2011 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | Sep 22, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A burst-mode phase shift keying (PSK) communications system according to an embodiment of the present invention enables practical, power-efficient, multi-rate communications between an optical transmitter and receiver. Embodiments may operate on differential PSK (DPSK) signals. An embodiment of the system utilizes a single interferometer in the receiver with a relative path delay that is matched to the DPSK symbol rate of the link. DPSK symbols are transmitted in bursts, and the data rate may be varied by changing the ratio of the burst-on time to the burst-off time. This approach offers a number of advantages over conventional DPSK implementations, including near-optimum photon efficiency over a wide range of data rates, simplified multi-rate transceiver implementation, and relaxed transmit laser line-width requirements at low data rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.