Photonic encoder
US7925169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 29, 2002 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Aug 29, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/22
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modulator arrangement for modulating an optical signal using a differential quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system comprising a laser for producing an optical signal of a selected wavelength, which signal is split by a splitter (4), each part of said split signal being applied to a respective phase modulator (6, 8). The phase modulators (6, 8) are adapted to modulate the phase of the signal in dependence on a respective drive voltage and the phase of the output of at least one modulator is shiftable. The split signals are recombined by an optical recombiner (12) to form an optical phase shift key output. The arrangement further comprises a phase modulator (20) adapted to chirp the optical phase shift key output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.