We investigate the pattern-dependent decoding failures that occur with electronic dispersion compensation (EDC) when
using full optical-field reconstruction, and find that the performance of such an EDC receiver may be degraded by an
isolated '1' bit surrounded by long strings of consecutive '0's. By reducing the probability of occurrence of this kind of
isolated '1', we experimentally achieved 10Gbit/s on-off keyed signal transmission over 372km field-installed singlemode
fiber without optical dispersion compensation.