Generation of optical signals with RF components
US5777771A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Jan 16, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/508
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical beam having a high radio-frequency modulation is generated by generating a lower frequency modulation, using it to control the optical output of a laser and further modulating the optical output in an optical modulator by a control signal having another lower frequency modulation generated. Either or both of the lower frequency modulations also carries an information containing modulation. the effect of the optical modulator is to up-convert the modulation carried by the optical beam by the modulation frequency of the control signal. The optical modulator may be a Mach-Zehnder interferometer. The non-linearity of such a modulator with respect to its control input may be exploited by selecting the amplitude of the control signal such that the optical output is up-converted by an integer multiple of the initial modulation frequency. These methods avoid the need to apply the high frequency modulation to either the laser input or the control input directly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.