Complex dynamics of silicon microring resonators loaded by delayed feedback
elements enable high-speed photonic reservoir computing. Implementing feedback
is especially challenging when the required delay should match the time scales
of silicon’s nonlinearities. To increase the computation speed and preclude any
need for very long delay lines, we avoid relying on silicon’s nonlinearity and
merely employ either amplitude or phase modulation along with direct detection.
By supplementing its memory with that of the electronic output layer, the
proposed photonic reservoir composed of a Mach-Zehnder interferometer and a
microring resonator is predicted to perform computations one order of magnitude
faster than those based on silicon’s nonlinearity with its speed only limited
by the modulation/detection bandwidth. This reservoir performs accurately in
NARMA-10, Mackey-Glass, and Santa-Fe prediction tasks, and enables signal
equalization in optical communication systems.

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