Title :
Enhanced AM and FM modulation response of complex coupled DFB lasers
Author :
Zhang, L.M. ; Carroll, J.E.
Author_Institution :
Dept. of Eng., Cambridge Univ., UK
fDate :
5/1/1993 12:00:00 AM
Abstract :
Significant improvements in the small AM bandwidth and FM efficiency of a DFB laser are obtained by introducing a carrier dependent complex coupling coefficient. A simulation using a large-signal dynamic model shows that the 3-dB cutoff frequencies for AM can be increased by factors of three by having the index and gain coefficients in antiphase. In contrast, the efficiency of FM, at low frequencies, can be similarly improved if the index and gain coupling are in phase.<>
Keywords :
amplitude modulation; distributed feedback lasers; frequency modulation; laser theory; optical modulation; semiconductor lasers; AM modulation response; FM efficiency; FM modulation response; antiphase; carrier dependent complex coupling coefficient; complex coupled DFB lasers; cutoff frequencies; gain coefficients; gain coupling; in-phase; index components; index coupling; large-signal dynamic model; low frequencies; optical constants; semiconductor laser diodes; small AM bandwidth; Chirp; Diode lasers; Electrons; Frequency modulation; Laser noise; Laser theory; Optical coupling; Optical modulation; Semiconductor device noise; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
