Abstract

What can we learn from other fields? — Fiber optics is converging with other digital communications fields – cellular, satellite, digital subscriber line, etc. — But techniques from existing fields are of limited help – our carrier linewidth is much higher, 10^-4 baud rate – our impairments are of long duration, >100 symbols – our data rate is much higher, 100Gb/s — We must develop our own algorithms — Existing field of estimation theory says how to develop algorithms – best possible estimate is the optimal estimate – other ad hoc estimate may be good enough, or not – must compare ad hoc estimate with optimal estimate to find out how good it is

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