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We investigate, both numerically and experimentally, the usefulness of adistributed nonlinearity in a passive coherent photonic reservoir computer.This computing system is based on a passive coherent optical fiber-ring cavityin which part of the nonlinearities are realized by the Kerr nonlinearity.Linear coherent reservoirs can solve difficult tasks but are aided by nonlinearcomponents in their input or output layer. Here, we compare the impact ofnonlinear transformations of information in the reservoir input layer, its bulk- the fiber-ring cavity - and its readout layer. For the injection of data intothe reservoir, we compare a linear input mapping to the nonlinear transferfunction of a Mach Zehnder modulator. For the reservoir bulk, we quantify theimpact of the optical Kerr effect. For the readout layer we compare a linearoutput to a quadratic output implemented by a photodiode. We find that opticalnonlinearities in the reservoir itself, such as the optical Kerr nonlinearitystudied in the present work, enhance the task solving capability of thereservoir. This suggests that such nonlinearities will play a key role infuture coherent all-optical reservoir computers.

Distributed Kerr Nonlinearity in a Coherent All-Optical Fiber-Ring Reservoir Computer