Design of electro-optical flip-flop

The neuromorphic photonic circuits have the potential to generate a wide variety of devices or systems with specialized functions. In our previous work, we proposed an electro-optical architecture to form the logic gates. Electro-optical AND, OR, NAND, NOR, XOR and XNOR logic gates could be realized in the structure by tuning the parameters of the electro-optical devices. In this work, we design the electro-optical flip-flop with two electro-optical logic gates. The electro-optical logic gates are built by means of Multilayer Perceptron using directional couplers, phase modulators and optical amplifiers. The truth value of the input signal 0 or 1 is determined by the applied voltage, 0V or 1V, on the two phase modulators, respectively. We also assess the tolerance of the system by calculating the visibility of the output signals with 1% error due to the fabrication error of the optical components. The simulation results show that the minimum visibility of the logic gates and the flip-flop are 0.91 and 0.98, respectively indicating that the electro-optical flip-flop can be realized even with the fabrication errors.