Optical label switching scheme employing differential phase-shift keying for payloads and intensity modulation for labels using a single optical modulator
US7702246B2 · kind B2 · utility
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Key dates
| Filing date | Aug 13, 2005 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Jun 25, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical label-switching method and apparatus in which a payload signal is modulated on an optical carrier through differential phase-shift keying (DPSK) by a Mach-Zehnder modulator (MZM), and a label signal is imposed on the DPSK signal by the same MZM through an optical amplitude change effected by modulating the DPSK drive signal or MZM bias.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.