Optical coherent transient (OCT) processors have been implemented as an optical memory,~1 optical signal cross-correlator,~2 and optical true-time delay (TTD) device.~3 Such devices offer the ability to continuously process an optical waveform modulated in amplitude and/or phase at projected data rates greater than 10 GHz.~4 These implementations, however, make a temporal distinction between programming and processing stages. Single-shot programmed gratings in non-persistent materials, in persistent one-photon (e.g., hyperfine storage), and two-photon (i.e., gated storage) materials generally have low efficiencies, and require strong programming and weak processing pulses. Alternatively, a grating could be accumulated by repeating lower intensity programming pulses, but the distinction between programming and processing still remains.
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