Abstract
Decision feedback equalization (DFE) may provide a simple way to dramatically increase the bit rate on multimode optical systems. Computer simulations of digital multimode systems with tapped delay-line linear equalization and/or DFE are described. Results indicate that with relatively simple hardware it may be possible to increase by many times the usable bit rate on dispersion-limited optical channels, with a power penalty less than that for multilevel transmission and without the latter's complexity. For example, one could double the bit rate of a two-level system by paying an equalization power penalty of about 3 dB with DFE, whereas doubling the bit rate by going to four levels requires a penalty of 4.8 dB.
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