Title :
Characteristics of optical duobinary signals in terabit/s capacity, high-spectral efficiency WDM systems
Author :
Ono, Takashi ; Yano, Yutaka ; Fukuchi, Kiyoshi ; Ito, Toshiharu ; Yamazaki, Hiroyuki ; Yamaguchi, Masayuki ; Emura, Katsumi
Author_Institution :
NEC Corp., Kawasaki, Japan
fDate :
5/1/1998 12:00:00 AM
Abstract :
Optical duobinary signals have been applied to dense wavelength division multiplexing (WDM) systems with high-spectral efficiency to fully utilize a limited gain bandwidth of about 35 nm (4.4 THz) for an erbium-doped fiber amplifier (EDFA). These signals are one type of partial response signals and have narrower bandwidth than conventional intensity modulation (IM) signals. Thus, the use of these signals should make possible to attain ultradense WDM systems. In this paper, characteristics of optical duobinary and IM signals in ultradense WDM systems are compared through experimental evaluations at 20 Gb/s. High-spectral efficiency of 0.6 b/s/Hz was reached in this demonstration
Keywords :
erbium; fibre lasers; optical crosstalk; optical fibre dispersion; optical modulation; wavelength division multiplexing; 120 km; 2.64 Tbit/s; 20 Gbit/s; 4.4 THz; WDM; dense wavelength division multiplexing; erbium-doped fiber amplifier; high-spectral efficiency; high-spectral efficiency WDM systems; intensity modulation; limited gain bandwidth; narrower bandwidth; optical duobinary signals; partial response signals; terabit/s capacity; ultradense WDM systems; Bandwidth; Erbium-doped fiber amplifier; Optical crosstalk; Optical distortion; Optical fiber dispersion; Optical filters; Optical modulation; Optical receivers; Optical transmitters; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
