Series:parallel converter for broadband optical communications - has coincidence gates comparing outputs of chain of frequency dividers

摘要

The series parallel converter has a phase detector comparing the input bits with the output of the last divider in a chain of frequency dividers coupled to the output of a VCO. The VCO frequency is a fraction of the signal frequency and is phase locked by the detector output. A first set of coincidence gates compares the input signal with the output of the second frequency divider. A second set of coincidence gates compares the outputs of the first set with the output of the first frequency divider. A third set of coincidence gates compares the second set out puts with the VCO output to produce the parallel output signals (C).