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All-optical time-stretch digitizer
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DOI：10.1063/1.4742173.png)
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Abstract
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We propose and demonstrate an all-optical time-stretch digitizer for real-time capture of ultrafast optical signals, beyond the bandwidths achievable by electronics. This approach uniquely combines four-wave mixing and photonic time-stretch technique to slow down and record high-speed optical signals. As a proof-of-concept, real-time recording of 40-Gb/s non-return-to-zero on-off-keying optical data stream is experimentally demonstrated using a stretch factor of 54 and 1.5-GHz back-end electronic bandwidth. We also report on the observation of dispersion penalty and its mitigation via single-sideband conversion enabled by an optical bandpass filter. Our technique may provide a path to real-time capture of ultrahigh-speed optical data streams. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4742173]
Keywords:
PARAMETRIC AMPLIFICATION
PERFORMANCE
CONVERSION
CONVERTER
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