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MASOUD MOHAMMADI1, RAHIM KARAMI2, MAHMOUD SEIFOORI1, SAEED OLYAEE1,2,*
This study aims to design and simulate a two-dimensional all-optical nonlinear analog-to-digital converter (ADC) using a set of power splitters, U-shaped, add/drop, and bus waveguides. In this work, the transmission and wavelength of output ports are managed by the length of the waveguide, number of coupling rods, nonlinear effects, and also the radius and refractive index of coupling and scattering rods. In this design, according to the nonlinear effects and the controlling parameters we can approximate the logic 0 and 1 states using the power transmission at the output ports. The finite-difference time-domain (FDTD) method is employed to investigate the transmission characteristics of the device for a variety of refractive indices. The output efficiency of the 2-bit converter is estimated as 80% and the footprint of the proposed structure is obtained to be 741 µm2 . The minimum quantized pulse width of the proposed structure is 0.7 ps. Considering this time delay, the conversion rate is estimated as much as 1430 Gb/s.
Analog-to-digital converter (ADC), Silicon photonic crystal, Interference, Nonlinear effect.
MASOUD MOHAMMADI, RAHIM KARAMI, MAHMOUD SEIFOORI, SAEED OLYAEE, Ultra-compact 2-bit analog-to-digital convertor based on silicon photonic crystal waveguide, Optoelectronics and Advanced Materials - Rapid Communications, 18, 1-2, January-February 2024, pp.8-15 (2024).
Submitted at: June 14, 2023
Accepted at: Feb. 9, 2024
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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