Title :
Simultaneous suppression of stimulated Brillouin scattering and interferometric noise in externally modulated lightwave AM-SCM systems
Author :
Willems, F.W. ; Muys, W. ; Leong, J.S.
Author_Institution :
AT&T Network Syst., Heizen, Netherlands
Abstract :
Externally modulated AM-SCM lightwave systems employing optical power amplifiers, small linewidth DFB lasers and long optical feeder lines, face low stimulated Brillouin scattering threshold powers and phase-to-intensity noise conversion by multipath interference through Rayleigh scattering. We show that these problems can be effectively counteracted simultaneously without introducing additional intermodulation distortion, both by single tone phase modulation and by dithering of the laser´s optical frequency.<>
Keywords :
amplitude modulation; cable television; distributed feedback lasers; intermodulation distortion; optical fibre subscriber loops; optical modulation; optical noise; phase modulation; spectral line breadth; stimulated Brillouin scattering; subcarrier multiplexing; Rayleigh scattering; dithering; externally modulated lightwave AM-SCM systems; interferometric noise; intermodulation distortion; laser optical frequency; long optical feeder lines; low stimulated Brillouin scattering threshold powers; multipath interference; optical power amplifiers; phase-to-intensity noise conversion; single tone phase modulation; small linewidth DFB lasers; stimulated Brillouin scattering; Brillouin scattering; Laser noise; Nonlinear optics; Optical distortion; Optical modulation; Optical noise; Optical scattering; Phase modulation; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
