High speed modulation of optical subcarriers
US7292792B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Nov 6, 2007 |
| Priority date | — |
| Expiry date | Oct 19, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2653
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for transmitting digital data includes splitting a coherent optical carrier having a subcarrier into mutually coherent optical carriers, producing corresponding sequences of phase shifts in each of the mutually coherent optical carriers, and then, interfering the mutually coherent optical carriers. The interfering produces an output optical carrier whose subcarrier has modulated inphase and quadrature components with a corresponding sequence of pairs of values. The pairs of values of the modulated inphase and quadrature phase components produced by the interfering correspond to a sequence of coordinate pairs for the signal points the 4-PSK 2D, 16-QAM 2D, or 16-PSK 2D constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.