Chirped laser with passive filter element for differential phase shift keying generation
US7991297B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2008 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jan 5, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/0078
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for generating D-N-PSK optical signals is disclosed wherein a laser is modulated to generate optical signal pairs including phase modulated and fixed phase portions, the phase modulated portions having a frequency encoding one or more data symbols and the fixed phase portion having a carrier frequency and a phase corresponding to the immediately preceding phase modulated portion. The output of the laser is passed through an optical spectrum reshaper having a transmission function chosen to attenuate a plurality of the phase modulated portions relative to the fixed phase portions. The phase modulated portions may have N frequency levels located on either side of the carrier frequency. One of the N frequency levels may be equal to the carrier frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.