Abstract
Direct 40 Gb/s electrical modulation as in electrical time division multiplex (ETDM) has advantages over optical time division multiplex (OTDM) with respect to the mechanical size, cost and volume production for 40 Gb/s transmission system. The progress of 40 Gb/s component technologies, especially in the electrical multiplexer/demultiplexer and the electro-optic modulator (EOM), has made the development to deployment of 40 Gb/s ETDM transmission system within reach. In the choice of EOM, electroabsorption modulator (EAM) has the advantage over LiNbO3 modulator (LNM), on its small size, compatibility to integrate with DFB lasers, low driving voltage, and bias-drift insensitivity. To our knowledge, whereas there are a number of publications on EAM design,1–3 there are few publications on EAM modeling and the application of such a model on the design optimization. In this paper, a large signal model for EAM is presented on the insertion loss (IL) and extinction ratio (ER) prediction with respect to different bias and RF driving signal levels. A figure of merit (FOM) for EAM is proposed to compare EAM performances. Furthermore, two system performance parameters are introduced to evaluate EAM IL and ER on end-to-end system performance.
© 2002 Optical Society of America
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