Title :
The influence of directly modulated DFB LD sub-mode oscillation on long-span transmission system
Author :
Henmi, N. ; Koizumi, Y. ; Yamaguchi, M. ; Shikada, M. ; Mito, I.
Author_Institution :
Opto-Electron. Res. Lab., Kawasaki, Japan
fDate :
5/1/1988 12:00:00 AM
Abstract :
Error-rate floors have been observed in several long-span transmission experiments at 500 Mb/s, using 1.5-μm distributed-feedback laser diodes (DFB LDs) and 1.3-μm zero dispersion optical fibers. It is proposed that for the threshold gain difference between main and submode (for DFB LDs), Δα is a good parameter to specify the submode oscillation characteristics. It is experimentally and theoretically confirmed that the threshold gain difference Δα must be greater than 5-6 cm-1, to avoid the error rate floor at 500 Mb/s. It was also confirmed that λ/4 phase-shifted DFB LDs can easily satisfy this condition
Keywords :
distributed feedback lasers; optical communication equipment; optical fibres; optical links; 1.3 micron; 1.5 micron; 500 Mbit/s; DFB LDs; distributed-feedback laser diodes; error rate floor; long-span transmission system; modulated DFB LD sub-mode oscillation; threshold gain difference; zero dispersion optical fibers; Diode lasers; Error analysis; Fiber lasers; High speed optical techniques; Intersymbol interference; Optical devices; Optical fiber dispersion; Optical fiber losses; Optical fibers; Propagation losses; Semiconductor lasers;
Journal_Title :
Lightwave Technology, Journal of
