Abstract
This paper presents theoretical investigation of the influence of gain suppression on dynamic characteristics of InGaAsP laser diodes under digital modulation. The study is based on numerical solution of the laser rate equations in which the bias current is augmented by a digital signal with norreturn to zero coding. The modulation characteristics include the eye diagram, turn-on jitter and quality factor of the modulated laser signal. Nonlinear gain is found to improve the eye-diagram quality by increasing the quality factor and reducing the turn-on jitter. Influence of gain suppression on frequency chirp induced by the temporal carrier-induced variation of the refraction change at high bit rates is also illustrated.
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