We discuss two implementations of opto-electrical interfaces, their characteristics and functionalities using a hybrid M&S approach. These interfaces consist in a transmitter and a receiver, composed by electrical and optical parts, that translate electrical signals into optical impulses and viceversa. The first implementation, performed using the CD++ modeling environment, represents a discrete-event model of the system following the DEVS formalism. The other implementation uses the Modelica Standard Library to compose the electrical parts as a continuous-time model, and the Modelica DEVSLib library to describe the optical part as a discrete-event system. The obtained simulation results are equivalent in both implementations. They reproduce translation of a continuous-time sinusoid electrical signal into discrete optical impulses in the transmitter, and the opposite process in the receiver. These approaches simplify the development of multidomain hybrid systems and the study of ONoC at a high abstraction level. 1
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