Suppression of stimulated brillouin scattering in optical transmission system
US5892607A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1996 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Oct 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/2537
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical modulator for a high power laser transmitter includes a laser source coupled through a phase modulator to a signal modulator. A noise source provides a band limited noise signal to either the laser source or the phase modulator or both. Alternatively, an optical modulator for a high power laser transmitter includes a laser source providing a laser output optical signal and a phase modulator. First and second continuous wave signals at respective first and second frequencies are combined to modulate either the laser source or the phase modulator. The first frequency is different than the second frequency. The laser and phase modulation produces a broadened optical output signal such that the broadened optical output signal is characterized by beat frequencies harmonically related to the first and second frequencies. The modulation bandwidth includes no significant beat frequencies. Each of the multiple beat frequencies produced has a correspondingly reduced amplitude but has the same laser line width, thus increasing the power that can be injected into the fiber before the onset of stimulated Brillouin scattering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.