KEYWORDS: Optoelectronics, Analog electronics, Clocks, Photodiodes, Optical clocks, Signal processing, Electronics, Signal generators, Data conversion, Optical networks
A novel optoelectronic scheme for optical sampling and parallel demultiplexing of different phases
(polyphase) of an input analog signal is presented. With this scheme higher sampling rate can be attained by scaling. A
unique feature of this approach is that the electrical-in to electrical-out signal transfer is maintained for the
optoelectronic sampling and demultiplexing process. We demonstrate the basic tenets of this approach by implementing
an optoelectronics two-stages divide-by-four decimator circuit where the first stage demultiplexs a sampled signal having
a repetition rate f into its even and odd subsamples with each subsample having a repetition rate of f/2 , and the second
stage demultiplexs the even and odd subsamples into four subsamples, odd/odd, odd/even, even/odd and even/even,
each subsample having a repetition rate of . f/4 As a practical testing, a 100MHz RF electrical signal was sampled at
the rate of 1.28GSPS (Giga/Samples/Sec) and demultiplexed into four 320GSPS sampled signals.
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