Title :
High slope efficiency and low noise characteristics in tapered-active-stripe DFB lasers with narrow beam divergence
Author :
Kito, Masahiro ; Inaba, Yuichi ; Nakayama, Hisashi ; Chino, Toyoji ; Ishino, Masato ; Matsui, Yasushi ; Itoh, Kunio
Author_Institution :
Electron. Res. Lab., Matsushita Electron. Corp., Osaka, Japan
fDate :
12/1/1999 12:00:00 AM
Abstract :
We report high slope efficiency and low noise characteristics in a distributed feedback (DFB) laser lasing at 1.3 μm with narrow beam divergence by employment of a laterally tapered active stripe over the whole cavity. This tapered structure is designed to realize narrow beam divergence, low threshold current, and high longitudinal mode selectivity. The fabricated tapered-active-stripe DFB lasers demonstrated of 9.20×13.40 and a record slope efficiency, for a narrow beam DFB laser, of 0.59 mW/mA. The temperature characteristics from -10°C to 85°C shows high output power at high temperature, stable single longitudinal mode oscillation and stable far-field patterns. Furthermore, for the first time ever, a low relative intensity noise characteristic of under -155 dB/Hz has been realized when butt-coupling into a single-mode fiber
Keywords :
distributed feedback lasers; laser beams; laser cavity resonators; laser modes; laser noise; laser transitions; optical fibre couplers; quantum well lasers; -10 to 85 C; 1.3 mum; MQW lasers; butt-coupling; distributed feedback laser; high longitudinal mode selectivity; high output power; high slope efficiency; high temperature; laterally tapered active stripe; low noise characteristics; low relative intensity noise characteristic; low threshold current; narrow beam DFB laser; narrow beam divergence; single-mode fiber coupling; stable far-field patterns; stable single longitudinal mode oscillation; tapered structure; tapered-active-stripe DFB lasers; whole cavity; Active noise reduction; Distributed feedback devices; Employment; Laser beams; Laser feedback; Laser modes; Laser noise; Power generation; Temperature; Threshold current;
Journal_Title :
Quantum Electronics, IEEE Journal of
