Differential encoder for an optical DQPSK modulator
US7327961B2 · kind B2 · utility
10Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 29, 2002 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Jun 30, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modulator arrangement adapted to use a differential quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system, comprising a precoder (16), which is adapted to generate drive voltages for first and second phrase modulators (6, 8) in dependence upon first and second data streams. The respective drive voltages for the first and second modulators (6, 8) are fed back to the precoder inputs with a delay related to the line speed of the data system, wherein the length of the delay corresponds to n bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.