Zero-forcing electrical filters for direct detection optical systems

Li, Peter C; Humblet, Pierre A
IEEE Transactions on Communications, Volume 44, N°6, June 1996

Intersymbol interference (ISI) in direct detection optical systems can limit channel spacing in frequency division multiplexing systems, and data rates, and transmission distances in long-haul transmission, It is desirable to reduce or cancel ISI in these situations, We investigate zero-forcing electrical filters to cancel ISI, and obtain tight performance hounds for minimum noise variance zero-forcing filters. We apply the results to Mach-Zehnder and Fabry-Perot filters, and to fibers with second order dispersion. We compare the performance of zero-forcing filters tea that of rectangular impulse response filters and find that zero-forcing filters are advantageous in severe ISI situations with multilevel signaling.

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