Photonic assisted optical under-sampling with non-uniform sample intervals
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United States of America Patent
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Dec 2, 2014
Grant Date -
Mar 14, 2013
app pub date -
Sep 11, 2012
filing date -
Sep 12, 2011
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Abstract
An apparatus and method are disclosed to digitize an input electrical signal. A sequence of nonuniformly spaced optical pulses impinges an optical modulator, where the pulses are modulated by the electrical input signal, the optical pulses being detected by one or more photoreceivers, the photoreceiver outputs being electrically sampled in analog-to-digital converters and then processed in a digital signal processor (DSP) in order to measure the electrical input signal. The series of nonuniform pulses are formed by interleaving L uniformly spaced pulse streams each of repetition period T and where fmax, the maximum allowable spectral frequency of the input electrical signal, is greater than 4·L·f/2, where f=1/T.
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