Wideband high resolution time-stretched photonic analog-to-digital converter

摘要

A method of performing analog to digital conversation of an analog signal V_in(t), the method including the steps of: utilizing both of the complementary arms of an electro-optic modulator to recover the analog input signal V_in(t), while using only one time-stretch element and one λ-demultiplexer after the electro-optic modulator. The single time-stretch element and one λ-demultiplexer serve to stretch and demultiplex the signals from both of the complementary output arms of the electro-optic modulator thereby improving and simplifying post-processing algorithms used to correct for static distortions and nonlinearities that originate from imperfect photonic hardware. Double-balanced photoreceivers are preferably coupled to outputs of the single λ-demultiplexer. The single time-stretch element is preferably implemented by a chirped fiber grating. Apparatus for carrying out the method is described.