Title :
Limits on the spectral efficiency of intensity modulated direct detection systems with optical amplifiers
Author :
Shtalf, M. ; Mecozzi, A.
Author_Institution :
AT&T Labs. Res., Red Bank, NJ, USA
Abstract :
We study the information capacity and the spectral efficiency of communication systems with optical amplifiers, in the direct detection intensity modulation case. We show that with typical values of OSNR of the order of 20 dB, multilevel signaling can increase the spectral efficiency by no more than a factor of 3.5 relative to binary modulated systems. The highest spectral efficiency is obtained with a symmetric optical spectrum, and it cannot be improved by removing one sideband as in the single sideband modulation case.
Keywords :
channel capacity; intensity modulation; optical fibre communication; optical modulation; optical noise; telecommunication signalling; OSNR; binary modulated systems; communication systems; direct detection intensity modulation; information capacity; intensity modulated direct detection systems; multilevel signaling; optical amplifiers; single sideband modulation case; spectral efficiency; symmetric optical spectrum; Bandwidth; Intensity modulation; Optical amplifiers; Optical detectors; Optical distortion; Optical modulation; Optical noise; Semiconductor optical amplifiers; Signal to noise ratio; Stimulated emission;
Conference_Titel :
Optical Fiber Communication Conference and Exhibit, 2001. OFC 2001
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
1-55752-655-9
