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Wavelength-division-multiplexing (WDM) transmission is very attractive because of its capability of providing network flexibility, such as route redundancy, and also because of its cost-effectiveness in increasing transmission capacity through the use of conventional, low-cost devices.1 In the realization of a cost-effective WDM transmission system, the choice of signal light sources is very critical. An external modulation scheme is usually preferred for use in densely spaced, multigigabit WDM systems because of its robustness to fiber dispersion, but it is too expensive and represents overengineering for most terrestrial systems with regenerative repeater spacings under 300 km. In this paper we describe an eight-channel 2.5-Gbit/s WDM transmission experiment over 275 km in which directly modulated 1.55-μm MQW DFB-LDs were used.2
© 1995 Optical Society of America
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