Simulation of all-optical NOT/OR/AND/NAND/NOR/XNOR/XOR logic gates using a single structure high contrast index nonlinear multimode interference coupler

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 22dB to 12dB on the optimized output width.

Multimode interference coupler based on general interference for integrated optical and quantum optic devices: a review

“…The 2 × 2 GIMMI coupler is used as a basic component for the design and development of the optical power splitter/combiners, switches [1], waveguide division multiplexers and demultiplexers [2] and optical logic gates [3,90] due to its robustness and easy fabrication process.…”

“…The GIMMI devices are employed as a basic optical logic gate component of optical processor. Several approaches are used to obtain the operations of all optical logic gates considering Kerr-nonlinear material within the MMI coupling [13][14][15], controlling optical pulses [16], having laser diodes in an active MMI region [17], and special structures of MMI couplers [18,90]. The principle of the operation of optical logic gates using nonlinear MMI regions is almost close to that of active GIMMI based optical switches.…”