Title :
Dynamic properties of partly gain-coupled 1.55-μm DFB lasers
Author :
Lu, Hanh ; Makino, Toshihiko ; Li, Guo Ping
Author_Institution :
Bell-Northern Res., Ottawa, Ont., Canada
fDate :
8/1/1995 12:00:00 AM
Abstract :
The lasing characteristics and dynamic properties of partly gain-coupled 1.55-μm DFB lasers with a gain corrugation in the strained-layer MQW active region are presented. Narrow spectral linewidth, which is associated with the low linewidth enhancement factor, was experimentally measured. By analyzing data from RIN measurements, the damping rate, the damping factor, the intrinsic bandwidth and the effective differential gain were obtained. From the small-signal frequency response, a measured 3 dB bandwidth of 22 GHz at 10 mW output power was achieved. The high bandwidth is believed to be related to the high differential gain, resulting from the combination of longitudinal gain and index-coupling mechanisms and the reduction of the carrier transport time, which is due to an efficient lateral carrier injection along the longitudinal interface. Experimental results show that under 10 Gbit/s pseudorandom NRZ modulation, the devices have small wavelength chirp and clear eye openings making them suitable for long haul and high bit-rate applications
Keywords :
chirp modulation; damping; distributed feedback lasers; laser beams; laser feedback; laser modes; optical couplers; optical modulation; optical transmitters; quantum well lasers; 1.55 mum; 10 Gbit/s; 10 mW; 22 GHz; DFB lasers; RIN measurements; carrier transport time; damping factor; damping rate; dynamic properties; effective differential gain; gain corrugation; gain-coupled lasers; high bit-rate applications; index-coupling mechanisms; intrinsic bandwidth; lasing characteristics; lateral carrier injection; longitudinal gain-mechanisms; longitudinal interface; low linewidth enhancement factor; output power; pseudorandom NRZ modulation; small-signal frequency response; spectral linewidth; strained-layer MQW active region; Bandwidth; Damping; Data analysis; Frequency measurement; Frequency response; Gain measurement; Optical signal processing; Power generation; Power measurement; Quantum well devices;
Journal_Title :
Quantum Electronics, IEEE Journal of