Title :
Low distortion 1.3 μm strained-layer MQW-DFB laser for AM-SCM transmission systems with large channel capacity
Author :
Ishino, Masato ; Takenaka, Naoki ; Kito, Masahiro ; Fujihara, Kiyoshi ; Ostuka, Noboyuki ; Fujito, Katsuyuki ; Matsui, Yasushi
Author_Institution :
Semicond. Res. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
11/1/1997 12:00:00 AM
Abstract :
1.3-μm strained-layer multiquantum-well distributed-feedback (SL-MQW-DFB) lasers with extremely low distortion and low noise characteristics up to high output-power as well as over wide frequency range were successfully fabricated. This was achieved by both the high relaxation oscillation frequency (fr) characteristics of the laser with the optimized SL-MQW active structure and the suppression of nonradiative current with relatively long laser cavity length. By using the SL-MQW laser with a 400-μm long cavity as a light source for CATV transmission system, high quality AM-SCM transmissions with the largest channel capacity (151 channel) was demonstrated due to low distortion characteristics at high output power. Also, for the laser with 300 μm long cavity, extremely low bias-current operation (17 mA above threshold) is realized in high quality 100 channel AMSCM transmissions, due to high fr at low bias-current
Keywords :
III-V semiconductors; amplitude modulation; cable television; distributed feedback lasers; electro-optical modulation; gallium arsenide; gallium compounds; indium compounds; infrared sources; laser cavity resonators; laser noise; laser transitions; optical fibre communication; optical noise; quantum well lasers; subcarrier multiplexing; 17 mA; 300 mum; AM-SCM transmission systems; CATV transmission system; InGaAsP; SL-MQW laser; above threshold; extremely low distortion; high output power; high output-power; high quality AM-SCM transmissions; high relaxation oscillation frequency characteristics; large channel capacity; largest channel capacity; low bias-current operation; low distortion; low distortion characteristics; low noise characteristics; nonradiative current; optimized SL-MQW active structure; relatively long laser cavity length; strained-layer MQW-DFB laser; strained-layer multiquantum-well distributed-feedback lasers; wide frequency range; Channel capacity; Distributed feedback devices; Frequency; Laser noise; Laser theory; Optical distortion; Power generation; Power lasers; Quantum well devices; Quantum well lasers;
Journal_Title :
Lightwave Technology, Journal of
