Abstract
Light-emitting diodes (LEDs) constitute a low-cost alternative for optical data
transmission of up to 1 Gb/s.What differentiates such applications from, e.g., backhaul optical
networks, is the fact that apart from their data throughput, LEDs are generally not as well
characterized by the manufacturer as, for example, optical fiber amplifiers. While for simple
modulation formats, this lack of knowledge is not a severe impediment; in any other situation, one
may face rather complex behaviors of commercial LEDs. In this paper, the main electro-optical
characteristics of LEDs are discussed, and it is shown that some popular simple nonlinear models
available in the literature are inadequate in describing their dynamics. As a way out of this
malady, we present a reverse-engineering approach that is based on Volterra expansions of the
electro-optical characteristic function of LEDs, enabling the introduction of a realistic
empirical model for commercial devices.
© 2011 IEEE
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