Abstract
A compact 3 × 3 polydiacetylene crystalline multimode interference (MMI) coupler simulated using the nonlinear modal propagation method (NMPA) is proposed as a conventional single structure to fulfill the functionality of all kinds of logic gates based on the on-off keyed (OOK) format. This novel approach has potential applications in all-optical logic gates for Boolean logic signal processing devices. We consider three categories of input arrangements to investigate six logic output situations. A side-input control of the gate operations with an opposite-side output is demonstrated to produce all the binary functions. Therefore, logic gate operations are optimized via the output width, where the contrast ratio between the ON and OFF states determines the efficiency of the all-optical gates, such as contrast ratios lying from 22 dB to 12 dB on the optimized output width.
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