Title :
Evaluation of 4-Gbit/s optical fiber transmission distance with direct and external modulation
Author :
Okiyama, Tadashi ; Nishimoto, Hiroshi ; Yokota, Izumi ; Touge, Takashi
Author_Institution :
Fujitsu Lab. Ltd., Kawasaki, Japan
fDate :
11/1/1988 12:00:00 AM
Abstract :
Transmission characteristics for a recently modulated measured distributed-feedbacked (DFB) laser and an externally modulated DFB laser using a Ti:LiNbO3, Mach-Zehnder modulator at 4 Gb/s are discussed. The transmission characteristics are estimated by an advanced eye-pattern analysis method. The maximum measured fiber dispersion with a directly modulated laser is 100 to 140 ps/nm when the chirp power penalty is 1 dB. However, for external modulation, there is no power penalty after transmission over a 2220-ps/nm dispersive fiber. This confirms that external modulation has superior transmission characteristics. The modulation scheme for 4-Gb/s systems in terms of these results is discussed.
Keywords :
digital communication systems; distributed feedback lasers; optical dispersion; optical fibres; optical links; optical modulation; 4 Gbit/s; DFB laser; LiNbO3:Ti; Mach-Zehnder modulator; direct modulation; distributed feedback laser; external modulation; eye-pattern analysis; fiber dispersion; optical fiber transmission distance; Chirp modulation; Fiber lasers; Integrated circuit noise; Laser modes; Optical fiber communication; Optical fiber dispersion; Optical fibers; Optical modulation; Optical receivers; Power lasers; Power measurement; Preamplifiers;
Journal_Title :
Lightwave Technology, Journal of
