Abstract
A novel scheme to determine the absolute time delay of an unknown signal in a stimulated Brillouin scattering based all-optical pulse compression system is demonstrated. Optical pulse train with high repetition rate is utilized as the probe lightwave to interact the counter-propagating pump lightwave modulated by the microwave signal to be processed. The finite optical fiber length brings in insufficient interactions between pump lightwave and probe pulses. The absolute time delay of the unknown microwave signal is determined by the pulse-compressed results that are carried by these probe pulse trains. The absolute time delay is experimentally demonstrated and is theoretically analyzed. The maximum experimental error is about 7 ns for a linearly frequency modulated pulse with 1 GHz sweep range.
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