Title :
Influence of intensity modulation produced by LD direct modulation on transmission characteristics of CPFSK differential detection system
Author :
Yoshida, Seiji ; Iwashita, Katsushi
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
fDate :
2/1/1992 12:00:00 AM
Abstract :
Transmission characteristics of a CPFSK differential detection system with LD direct modulation are studied by computer simulation. Simulation results show that the optimum wavelength for LD direct modulation CPFSK transmission shifts to a wavelength longer than zero dispersion wavelength because of the phase difference between the intensity and frequency modulation components. A precise investigation of the dependence of optimum total dispersion on several parameters reveals the essential role of the phase difference between intensity and frequency modulation induced by LD direct modulation. The transmission distance allowing a 1-dB power penalty at 10 Gb/s is 117 km for a wavelength 30 nm shorter than the zero dispersion wavelength, while the distance is 183 km for a wavelength 30 nm longer. This indicates that the zero dispersion wavelength shift is 11 nm for 100-km transmission
Keywords :
frequency shift keying; optical communication equipment; optical dispersion; optical links; optical modulation; semiconductor junction lasers; 10 Gbit/s; 100 km; 117 km; 183 km; CPFSK differential detection system; LD direct modulation; computer simulation; frequency modulation; intensity modulation; optimum total dispersion; optimum wavelength; phase difference; photodetectors; power penalty; receivers; transmission characteristics; transmission distance; transmission wavelength shift; zero dispersion wavelength; zero dispersion wavelength shift; Chromatic dispersion; Computational modeling; Computer simulation; Frequency estimation; Frequency modulation; Intensity modulation; Optical fiber communication; Optical transmitters; Phase modulation; Propagation constant;
Journal_Title :
Lightwave Technology, Journal of
