Young J. Jung

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All-optical 4-bit Gray code to binary coded decimal (BCD) converter was demonstrated, for the first time in our knowledge, with the number of 12 SOAs by means of commercially available numerical analysis tool (VPI). Circuit design approach was modified appropriately in order to fit the electrical method on an all-optical logic circuit based on cross gain(More)
We propose a novel metal slit array Fresnel lens for wavelength-scale optical coupling into a nanophotonic waveguide. Using the plasmonic waveguide structure in Fresnel lens form, a much wider beam acceptance angle and wavelength-scale working distance of the lens was realized compared to a conventional dielectric Fresnel lens. By applying the plasmon(More)
In this paper, an all-optical nonlinear gate employing a folded tandem-SOA structure is proposed. With a partial reflection mirror for the amplified signal, we achieve a self-seeded gain modulation effect in the folded tandem-SOA, thus eliminating an external saturating source required for the conventional tandem-SOA optical gate. The performance analysis(More)
For the first time, an integral equation approach for the numerical assessment of Semiconductor Optical Amplifiers (SOAs) is proposed. Performance comparisons between the suggested formulation and the traditional transfer matrix method are carried out in terms of the computation costs in solving the multi-wave mixing process in bi-directional, high-power(More)
SystemC is a popular open source library in C++ for developing embedded system design, from the abstract System Level Design until the accurate Register Transfer Level Design. SystemC simulation, however, runs in console mode (text-based), thus making it difficult for user to interact with the simulation. To extend the capabilities of SystemC simulation, it(More)
We proposed, for the first time, to utilize metal-slits array Fresnel lens for the optical coupling form free space into silicon slab waveguide while overcoming near focal length limit of the conventional dielectric Fresnel lens. Physical limits of the conventional Fresnel lens were revealed and it was proposed to employ metal-slit array to overcome these(More)
For the first time, we suggest the application of NOR-only two-level simplification method for the construction of flexible all-optical digital logic circuit. Arbitrary Boolean function operation and decoding of gray code to binary coded decimal (BCD) are demonstrated with the suggested approach.
A semiconductor optical amplifier-based all-optical read-only memory (ROM) is successfully demonstrated through simulations using a one-level simplification method optimized for optical logic circuits. Design details are presented, and advantages are discussed in comparison with an all-optical ROM-employing decoder. We demonstrate that eight characters can(More)
We propose a novel SOA-based nonlinear optical gate structure which uses a reflected input signal for the generation of cross gain modulation effect, instead of the conventional CW saturating tone. Comparison of the structures shows little or no degradation in the performances with the introduced modification for a highly integrated, simpler structure.
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