Title :
κL optimization for static and dynamic single longitudinal mode operation in 1.55 μm λ/4 shifted DFB LD
Author :
Yamaguchi, Masayuki ; Takano, Sinji ; Henmi, Naoya ; Uehara, Kunio ; Hasumi, Hideyo ; Shikada, Minoru ; Mito, Ikuo
Author_Institution :
NEC Corp., Kawasaki, Japan
Abstract :
κL (product of coupling coefficient and cavity length) optimization for static characteristics as well as dynamic behavior in 1.55-μm λ/4-shifted distributed-feedback laser diodes (DFB LDs) is presented. Threshold current, differential efficiency and single-longitudinal-mode operation yield are investigated statistically. Dynamic behavior, such as response and wavelength chirping under direct modulation and corresponding transmission performance using DFB LDs are evaluated in connection with κL . Transmission experiments which were performed at 2.4 Gb/s with 50- and 80-km 1.3-μm zero-dispersion fibers are described. It is concluded that a κL of 2.3-2.5 is the best value for preparing high-performance λ/4-shifted DFB LDs suitable for use in high-speed and long-span transmissions
Keywords :
distributed feedback lasers; optical communication equipment; optimisation; semiconductor junction lasers; λ/4 shifted DFB LD; 1.3 micron; 1.55 micron; 2.4 Gbit/s; 50 km; 80 km; cavity length; coupling coefficient; differential efficiency; direct modulation; distributed-feedback laser diodes; dynamic behavior; dynamic single longitudinal mode; optimization; response; static characteristics; static single longitudinal mode; threshold current; transmission experiments; transmission performance; wavelength chirping; zero-dispersion fibers; Current measurement; Fabry-Perot; Mirrors; Temperature; Threshold current;
Conference_Titel :
Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-87942-632-2
DOI :
10.1109/GLOCOM.1990.116701
