Open AccessPhotonic analog-to-digital conversion with equivalent analog prefiltering by shaping sampling pulses
Author(s) -
Feiran Su,
Guiling Wu,
Jianping Chen
Publication year - 2016
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.41.002779
Subject(s) - pulse shaping , sampling (signal processing) , band pass filter , optics , impulse response , photonics , impulse (physics) , digital filter , optical filter , analogue filter , pulse (music) , computer science , electronic engineering , physics , bandwidth (computing) , mathematics , telecommunications , laser , engineering , mathematical analysis , quantum mechanics , detector
We propose a photonic scheme to digitize RF signals with a programmable equivalent analog prefilter, where the filter impulse response is directly proportional to the time-reversed temporal shape of the sampling pulse and hence can be adjusted by shaping sampling pulses. The model of the proposed scheme is presented to prove its principle and derive its operation conditions. A four-channel scheme with program-controlled pre-filters is demonstrated experimentally, where bandpass filters with the phase shifts of 0°, 90°, 180°, and 270° are synthesized, respectively, by changing temporal shape of the sampling pulses. The experimental results agree well with the theoretical analysis, indicating the validity of the proposed scheme.