Abstract
Dynamic single-longitudinal-mode laser diodes such as distributed feedback laser diodes (DFB LDs) and distributed Bragg reflector diodes (DBR LDs) are the most suitable light sources for long-distance and high-bit-rate optical fiber transmission systems. However, spectral linewidth broadening due to the spectral chirping induced by direct current modulation is attracting much attention as the transmission-distance-limiting parameter.1 Several schemes have been proposed to reduce the spectral chirping, for example, compound cavity lasers with an external mirror,2 injection-locked lasers,3 and lasers with a high dc bias condition.4 Complicated adjustment and careful temperature stabilization were required for the former two methods and a several-decibel penalty for the receiver sensitivity from the decreased extinction ratio for the latter scheme. In this paper a new spectral chirping compensating method is proposed, and basic experimental results are given.
© 1985 Optical Society of America
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