Using the knowledge that any gate can be built through different arrangements of micro-ring resonators, this paper proposes the all-optical design of XOR and XNOR logic gates. The gates structure thus consists of micro-ring resonators (MRR) paired with a constant source of light (COS). MRRs in these designs are utilized as modulators by tuning their resonant wavelengths. In this way, under no external disturbances, the rings are uncoupled by default. The proposed devices are CMOS-compatible meaning that they can be fabricated using the existing technologies. Also, to reduce the fabrication complexity of the proposed devices, thermo-optic modulation is employed as primary light modulating technique. The logic gates are tested at 25 kpbs. Device parameters are provided as well for manufacturing purposes. The study concludes with suggestions on design improvements and potential application of the optical gates.
This paper focuses on design of specific type of optical logic gates - universal gates (NAND and NOR). These gates are based on microring resonators (MRR) coupled both in series (for NAND gate) and in parallel (in case of NOR gate). Because of their simplicity in terms of fabrication, the MRRs are modulated through thermo-optic effect of silicon. The MRRs in the proposed devices act as input ports combined with a constant source of light at specific wavelengths. Thus, through different coupling configurations of the rings, the logic is obtained. Due to the architectural features of the devices, complements of these gates (AND, OR) can be obtained as well. Consequently, the proposed designs exhibit the behavior of universal gates and their complements simultaneously. In addition, using Optical Spectrum Analyzer (OSA) as well as Optical Oscilloscope, static and corresponding dynamic responses are illustrated. Furthermore, complementary parameters such as extinction ratio and speed are evaluated.
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