Title :
Enhanced wavelength tuning range in two-section complex-coupled DFB lasers by alternating gain and loss coupling
Author :
Hong, Jin ; Kim, Hyung ; Makino, Toshi
Author_Institution :
Adv. Technol. Lab., Nortel, Ottawa, Ont., Canada
fDate :
7/1/1998 12:00:00 AM
Abstract :
A novel tunable two-section complex-coupled distributed feedback (DFB) lasers were demonstrated which exhibited an enhanced wavelength tuning range beyond 7 nm by current injection only. By a simple master-and-slave type of injection current control, either in-phase gain-coupling or antiphase loss-coupling mechanism can be activated, in such a way that one of the two Bragg modes around DFB stopband will become the lasing mode, and its wavelength can be simply and independently tuned by corresponding injection current. More then 45 dB side-mode suppression ratio (SMSR) over entire tuning range were obtained. Good system performance for 375 km transmission with butt-coupled III-V Mach-Zehnder (MZ) modulator at 2.5 Gb/s over nondispersion-shifted fiber was also demonstrated
Keywords :
distributed feedback lasers; electro-optical modulation; laser modes; laser tuning; optical transmitters; semiconductor lasers; 2.5 Gbit/s; 375 km; Bragg modes; alternating gain/loss coupling; antiphase loss-coupling mechanism; butt-coupled III-V Mach-Zehnder modulator; current injection; enhanced wavelength tuning range; entire tuning range; in-phase gain-coupling; independently tuned; injection current; lasing mode; master-and-slave type injection current control; nondispersion-shifted fiber; optical transmitters; semiconductor lasers; side-mode suppression ratio; system performance; tunable two-section complex-coupled distributed feedback lasers; two-section complex-coupled DFB lasers; Current control; Distributed feedback devices; Fiber lasers; Laser feedback; Laser modes; Laser tuning; Optical fiber communication; Semiconductor lasers; Tunable circuits and devices; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
