Abstract
The use of 1.55-μm DFB lasers in future wavelength division multiplexed (WDM) and broadband systems is of great interest for transmission through the conventional (1.3-μm zero dispersion) single-mode fiber. Also, among different DFB structures, the quarterwave shifted (QWS) DFBs are particularly attractive for their better mode selectivity and higher side-mode suppression. In a QWS DFB laser we observed a blue shift wavelength chirp which we attribute to longitudinal spatial hole burning,1,2 which was found to cause excessive system penalties. This slow blue shift-induced penalty may add to other system degradations particularly incurred for 1.53-μm operation of conventional SMFs such as dynamic wavelength chirp and mode partition noise.
© 1990 Optical Society of America
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