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Arbitrary, broadband radio-frequency (RF) waveforms are distributed over long fibers with stabilized group delay. Thermal drifts in delay are compensated based on chromatic dispersion. The input waveform and a control RF sine wave modulate two separate tunable laser diode sources, coupled into a dispersive delay fiber. The output phase of the delayed control tone is used to provide feedback for setting...
Stationary and localized Brillouin dynamic gratings are generated using phase modulation of both pump waves by a pseudo-random bit sequence. The gratings are applied to long variable delay of pulses and to cm-level distributed sensing.
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