Method and apparatus for reducing intra-channel distortions of received
data resulting from non-linear signal propagation includes parallel
detection subcircuits for determining output values of sequentially
provided optical data bits such that each of the sequentially provided
optical data bits is processed by only one of the parallel detection
subcircuits. Two parallel detection subcircuits process the input optical
data bits according to even valued and odd valued clock signals. Each
subcircuit has first and second signal analyzers to detect the value of
the input optical data bit and a first memory unit and a second memory
unit connected to the first and second signal analyzers. The input value
of clock information provided to the first and second memory units of the
first parallel subcircuit are 180.degree. out of phase with input values
indicative of a clock speed provided to the second parallel subcircuit.