Abstract

The frequency chirping caused by direct laser modulation limits the transmission bandwidth of a single-mode fiber system, even when we employ a directly modulated dynamic-single-mode laser. To eliminate this problem, some types of external intensity modulator, such as those employing electroabsorption1,2 and electrooptic effects3 have been studied. We have pointed out that frequency chirping is caused by phase modulation due to a refractive-index change in a loss modulator.4

© 1987 Optical Society of America

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