Title :
High performance and highly reliable λ/4 shifted MQW-DFB-DC-PBH-LDs for Gb/s coherent optical communication systems
Author :
Kitamura, Mitsuhiro ; Yamazaki, Hiroyuki ; Yamada, Hirohito ; Takano, Shinji ; Kosuge, Kazuhiro ; Sugiyama, Yuko ; Yamaguchi, Masayuki ; Mito, Ikuo
Author_Institution :
NEC Corp., Kawasaki, Japan
fDate :
6/1/1993 12:00:00 AM
Abstract :
The authors demonstrate high-performance and highly reliable single-frequency quarter-wave (λ/4)-shifted multiple-quantum-well distributed-feedback laser diodes with double-channel planar buried heterostructure (MQW-DFB-DC-PBH LDs). Superior characteristics, such as narrow spectral linewidth (about 1 MHz) and flat FM response (several GHz bandwidth with less than 50-kHz dip frequency) at high light output power, have been obtained with small values of coupling coefficient and cavity length product (κL), and thick separate-confinement-heterostructure (SCH) layers. An estimated lifetime in terms of spectral linewidth, FM response, and lasing wavelength of over 105 has been obtained, demonstrating that these devices are suitable for practical use in gigabit/second coherent optical fiber communication systems
Keywords :
distributed feedback lasers; optical communication equipment; semiconductor lasers; cavity length product; coherent optical fiber communication systems; coupling coefficient; double-channel planar buried heterostructure; frequency modulation response; high-performance; lasing wavelength; light output power; multiple-quantum-well distributed-feedback laser diodes; single frequency quarter wave shifted laser diodes; spectral linewidth; Distributed feedback devices; Frequency modulation; Frequency shift keying; Gratings; Light sources; National electric code; Optical device fabrication; Optical fiber communication; Optical receivers; Quantum well devices;
Journal_Title :
Quantum Electronics, IEEE Journal of
