Analog modulation of optical signals
US7146109B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2002 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Feb 7, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/5053
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optically modulated signal is generated for use in transporting data by generating a so-called sub-carrier modulated optical signal and, then, vector modulating the sub-carrier modulated optical signal to yield the desired modulated optical signal for transmission. The vector modulation includes a phase component and an amplitude component. In one specific embodiment of the invention, an apparatus for use in generating a modulated optical signal includes a generator to generate a sub-carrier modulated optical signal including an optical carrier and at least one sub-carrier and an analog vector modulator coupled to receive both the sub-carrier modulated optical signal from the generator and a data signal. The analog vector modulator generates an output optical signal by phase modulating and/or amplitude modulating the sub-carrier of the received optical signal in response to the data signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.