Abstract
We review techniques to characterize optical data with very
high fidelity using the principle of optical sampling based on four-wave
mixing in a highly nonlinear fiber. This approach results in sub-ps time
resolution without artifacts in the impulse response and also excellent
sensitivity allowing statistical analysis. In particular we describe
implementations aimed at differentially phase encoded data (such as DQPSK)
with all-optical balanced detection, formats requiring the complete signal
field recovery (such as QAM) with phase-sensitive sampling, and signals
requiring real-time recovery with all-optical real-time sampling. The
all-optical approach to characterize optical waveform is shown to be very
attractive and practical way to capture the details of various kinds of data
and is, in principle, also scalable to extremely high baud rates.
© 2009 IEEE
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