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Zero-forcing electrical filters for direct detection optical systems

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2 Author(s)
P. C. Li ; Naval Undersea Warfare Center, Newport, RI, USA ; P. A. Humblet

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 bounds 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 to that of rectangular impulse response filters and find that zero-forcing filters are advantageous in severe ISI situations with multilevel signalling

Published in:

IEEE Transactions on Communications  (Volume:44 ,  Issue: 6 )