Optical fiber synaptic sensor

Understanding neuron connections is a great challenge, which is needed to solve many important problems in neurobiology and neuroengineering for recreation of brain functions and efficient biorobotics. In particular, a design of an optical synapse capable to communicate with neuron spike sequences would be crucial to improve the functionality of neuromimmetic networks. In this work we propose an optical synaptic sensor based on an erbium-doped fiber laser driven by a FitzHung–Nagumo electronic neuron, to connect with another electronic neuron. Two possible optical synaptic configurations are analyzed for optoelectronic coupling between neurons: laser cavity loss modulation and pump laser modulation. The control parameters of the proposed optical synapse provide additional degrees of flexibility to the neuron connection traditionally controlled only by coupling strengths in artificial networks.

Research highlights
► We design an optical synapse based on a fiber laser to connect two electronic neurons.
► Loss and pump modulation configurations are analyzed for optoelectronic coupling.
► Optical synapse parameters provide additional degrees of flexibility to neuron connection.
► The proposed optical synapse will be promising for biorobotic and bioengineering applications