Title :
Low-chirp and high-power 1.55-μm strained-quantum-well complex-coupled DFB laser
Author :
Chi-Yu Wang ; Zuon-Min Chuang ; Wei Lin ; Yuan-Kuang Tu ; Ching-Ting Lee
Author_Institution :
Telecommun. Lab., Minist. of Transp. & Commun., Taoyuan, Taiwan
fDate :
3/1/1996 12:00:00 AM
Abstract :
High-power, low-chirp, and low-threshold current characteristics of 1.55 μm complex-coupled compressively strained InGaAsP quantum-well DFB laser with a loss grating are presented. Kink-free light-current characteristics with single-mode power over 40 mW are demonstrated for uncoated devices. A relatively low threshold current of 10 mA and a high slope efficiency of 0.23 W/A have been obtained even with the loss grating employed. Stable single-mode emission was demonstrated with a side mode suppression ratio up to 54 dB, a low chirp of less than 0.3 nm under 1 Gb/s pseudorandom digital modulation and a spectral linewidth of 8 MHz.
Keywords :
III-V semiconductors; chirp modulation; diffraction gratings; distributed feedback lasers; gallium arsenide; gallium compounds; indium compounds; laser modes; laser stability; laser theory; optical couplers; optical losses; optical modulation; quantum well lasers; spectral line breadth; 1 Gbit/s; 1.55 mum; 10 mA; 40 mW; InGaAsP; InGaAsP quantum-well DFB laser; complex-coupled; compressively strained; high slope efficiency; high-power; kink-free light-current characteristics; loss grating; low chirp; low threshold current; low-chirp; low-threshold current characteristics; pseudorandom digital modulation; side mode suppression ratio; single-mode power; spectral linewidth; stable single-mode emission; strained-quantum-well complex-coupled DFB laser; uncoated devices; Chirp; Fiber lasers; Gratings; Laser feedback; Laser modes; Optical coupling; Optical feedback; Optical losses; Quantum well lasers; Threshold current;
Journal_Title :
Photonics Technology Letters, IEEE
