Design and simulation of an all optical 8 to 3 binary encoder based on optimized photonic crystal OR gates

Naghizade, Saleh; Mohammadi, Sara; Khoshsima, Habib

doi:10.1515/joc-2018-0034

Cited by 24 publications

(11 citation statements)

References 51 publications

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“…Several combinational and sequential logic circuits for applications such as switching, multiplexing, parity checking, encoding, filtering and so on are constructed using logic gates [4]. All these circuits can be implemented using optical logic gates without any electro-optic conversions [5] [6] [7] [8] [9]. Several methods have been utilized to implement these gates such as using non-linear ring resonators [10], Semiconductor Optical Amplifiers (SOA) [11], non-linear directional couplers [12], Highly Non-Linear Fibers [13], photonic crystals [14], plasmonic slot waveguides [15] and quantum dot SOA [16].…”

Section: Introductionmentioning

confidence: 99%

Optimized design of an all-optical XOR gate with high contrast ratio and ultra-compact dimensions

Anagha

Jeyachitra

2022

Appl. Phys. B

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In this work, an optimized structure of an XOR gate working in the optical domain is put for-ward to achieve high contrast ratio and extremely compact dimensions using a photonic crystal platform. The above structure employs silicon rods in a hexagonal lattice configuration. The design works purely on linear interference effect between the incoming light signals and does not involve any non-linear materials. The Finite Difference Time Domain based simulations are utilized to study the propagation of light within the structure and the Plane Wave Expansion Method is applied to generate bandgap structure. After optimization of the various design parameters, a contrast ratio of 31.76 dB is attained by the proposed structure along with a response time of 0.46 ps and a footprint of 42.24 μm 2 . The device can be operated in the C Band with optimum performance at 1550 nm, which is the telecommunication wavelength. The operating bit rate for the proposed structure is 2.17 Tbps. All-optical XOR gate being a universal gate forms the building blocks of various sequential and combinational logic designs suitable for optical computing and communication applications.

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Section: Introductionmentioning

confidence: 99%

Optimized design of an all-optical XOR gate with high contrast ratio and ultra-compact dimensions

Anagha

Jeyachitra

2022

Appl. Phys. B

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“…Thus, they are more popular among designers. A large number of parameters, including the radius of the dielectric rod, the lattice constant, the type of rod arrangement, the dielectric constant, and the PhC unit cells' position, affect the resonant's intensity and frequency modes [14][15][16][17][18][19]. By changing every parameter, the blue or redshift occurs at resonant modes.…”

Section: Introductionmentioning

confidence: 99%

A novel design of fast and compact all-optical full-adder using nonlinear resonant cavities

Naghizade

Saghaei

2021

Opt Quant Electron

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In this paper, we report a new design of all-optical full-adder using two nonlinear resonators. The PhCbased full-adder consists of three input ports (A, B, and C for input bits), two nonlinear resonant cavities, several waveguides, and two output ports (for the Sum and Carry). Eight silicon rods and a nonlinear rod composed of doped glass form each resonant cavity. The well-known plane wave expansion technique is used to calculate the photonic band structure. It shows a wide photonic bandgap in the wavelength range of 1365 nm to 2074 nm covering the C and L optical transmission bands. The nite-difference timedomain method is applied to study the light propagation inside the full-adder. Our numerical results demonstrate when the incoming light intensity increases, the nonlinear optical Kerr effect appears and controls the direction of light emitted inside the structure as desired. The maximum time delay and footprint of the proposed full-adder are about 3ps and 758.5 µm 2 , respectively. Therefore, due to the low time delay and small footprint, the presented design can be used as a basic mathematical operator in the all-optical arithmetic logic unit.

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“…Photonic crystal ring resonators (PCRR) are well-known structures because they have excellent characteristics in realizing various compact optical devices [21][22][23][24][25]. Resonant modes of a PCRR depends on several physical parameters such as rod radius, lattice constant, and rods' refractive index [26][27][28][29][30][31]. In recent reports, researchers have shown that a PCRR can be used as an optical filter, and blueshift or redshift may occur in the resonant mod by changing any of these parameters [13,23].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Fast Tunable Optoelectronic Full-Adder Based on Photonic Crystal Ring Resonators Covered By Graphene Nanoshells

Naghizade

Saghaei

2021

Preprint

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This paper reports a new design of a tunable optoelectronic full-adder using two photonic crystal ring resonators (PCRRs). Every PCRR consists of a matrix of silicon rods surrounded by silica rods covered with graphene nanoshells (GNSs). The proposed full-adder is formed by three input ports, two PCRRs, and two output ports for 'SUM' and 'CARRY'. The plane wave expansion technique is used to study the photonic band structure of the fundamental PC microstructure, and the finite-difference time-domain method is also employed in the final design for solving Maxwell's equations to analyze the light propagation inside the structure. We can tune the PhC resonant mode for our desired application by setting the chemical potential of GNSs with an appropriate gate voltage. The numerical results reveal that when the chemical potential of GNSs changes, the switching mechanism occurs and manages the coupling and propagation direction of the input beam inside the structure. We systematically study the effects of physical parameters on the transmission, reflection, and absorption spectra. Our numerical results also demonstrate that the maximum delay is about 0.8 ps. The 663 µm2 area of the proposed full-adder based on two-dimensional materials makes it a building block of every photonic integrated circuit used for data processing systems.

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Design and simulation of an all optical 8 to 3 binary encoder based on optimized photonic crystal OR gates

Cited by 24 publications

References 51 publications

Optimized design of an all-optical XOR gate with high contrast ratio and ultra-compact dimensions

Optimized design of an all-optical XOR gate with high contrast ratio and ultra-compact dimensions

A novel design of fast and compact all-optical full-adder using nonlinear resonant cavities

Ultra-Fast Tunable Optoelectronic Full-Adder Based on Photonic Crystal Ring Resonators Covered By Graphene Nanoshells

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