Compact and ultrafast all optical 1-bit comparator based on wave interference and threshold switching methods

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asghar Askarian
Keyword(s):  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Logical Structure ◽  
Ring Resonators ◽  
Plane Wave Expansion ◽  
Threshold Switching ◽  
Wave Interference ◽  
All Optical ◽  
Fdtd Methods ◽  
Difference Time

Abstract In this study, we are going to design all optical 1-bit comparator by combining wave interference and threshold switching methods. The final structure composed of two nonlinear ring resonators and seven waveguides. The functionality of the suggested logical structure is analyzed and simulated by using plane wave expansion (PWE) and finite difference time domain (FDTD) methods. According to results, the proposed all optical 1-bit comparator has faster response and smaller footprint than all previous works. The maximum ON-OFF contrast ratio, delay time and area of the suggested optical comparator are about 16.67 dB, 1.8 ps, and 513 µm2, respectively.

scholarly journals A novel proposal based on 2D linear resonant cavity photonic crystals for all-optical NOT, XOR and XNOR logic gates

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Kouddad Elhachemi ◽  
Naoum Rafah
Keyword(s):  
Finite Difference Time Domain ◽  
Resonant Cavity ◽  
Logic Gates ◽  
Low Power Consumption ◽  
Plane Wave Expansion ◽  
Novel Structure ◽  
All Optical ◽  
Easy Integration ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

AbstractIn this paper, we are going to propose a novel structure of all-optical NOT, XOR and XNOR logic gates are presented using a two-dimensional photonic crystal (2D-PhC). This structure is optimized by varying the radius of the cavity, to obtain a quality factor Q = 1192, and also has several ports of entry and one port of output. The size of each structure is equal to 85.8 μm2. The contrast ratios for the structures proposed all-optical NOT, XOR and XNOR logic gates between levels “0” and “1” are, respectively, 25.08, 25.03, and 14.47 dB. The response time for the three logical gates is 8.33 ps, and the bit rate is calculated at about 0.12 Tbit/s, all simulations are based on both numerical methods such as finite difference time domain (FDTD) and plane wave expansion (PWE). Designed logic gates are characterized by low power consumption, compactness and easy integration.

scholarly journals A Modified Structure for All-Glass Photonic Bandgap Fibers: Dispersion Characteristics and Confinement Loss Analysis

ISRN Optics ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Sanjaykumar Gowre ◽  
Sudipta Mahapatra ◽  
P. K. Sahu
Keyword(s):  
Finite Difference Time Domain ◽  
Photonic Bandgap ◽  
Confinement Loss ◽  
Plane Wave Expansion ◽  
Photonic Bandgap Fiber ◽  
Loss Analysis ◽  
Photonic Bandgap Fibers ◽  
Wide Wavelength Range ◽  
Fdtd Methods ◽  
Difference Time

This paper investigates a modified structure for all-glass photonic bandgap fiber (AGPBF) having up-doped silica rods in the cladding region instead of air holes using plane wave expansion (PWE) and finite difference time domain (FDTD) methods. The proposed AGPBF structure exhibits tunable dispersion properties and improved confinement loss. It is observed that the confinement loss can be reduced simply by using a higher doping concentration in silica rods in the cladding. Also, it is possible to achieve flattened dispersion of the order of 1 ps/nm/km over a wide wavelength range.

All Optical BPSK Demodulator Using Photonic Crystal Based Coupled Waveguides

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahsa Karimzadeh ◽  
Alireza Andalib
Keyword(s):  
Photonic Crystal ◽  
Finite Difference Time Domain ◽  
Phase Shift Keying ◽  
Plane Wave Expansion ◽  
Working Mechanism ◽  
All Optical ◽  
Shift Keying ◽  
Simulation Results ◽  
Difference Time ◽  
Coupled Waveguides

AbstractIn this paper we will propose and design an all optical phase shift keying (PSK) demodulator using photonic crystal based coupled waveguides. The proposed structure should be designed such that it can generate digital 0 and 1 based on the phase of the input signal. The working mechanism is based on constructive and destructive of optical beams. The proposed structure was simulated using plane wave expansion and finite difference time domain methods. The simulation results show that the rise and fall times for the proposed structure are about 1.2 ps and 0.2 ps, respectively.

An Optical Majority Gate Using Photonic Crystal Based Nonlinear Resonant Cavity

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Ramin Yaghoobi ◽  
Sahel Javahernia
Keyword(s):  
Photonic Crystal ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Resonant Cavity ◽  
Plane Wave Expansion ◽  
Optical Logic ◽  
Majority Gate ◽  
All Optical ◽  
Optical Behavior ◽  
Difference Time

AbstractAll optical majority gate is an optical logic structure with three input and one output ports. In this paper we designed an optical majority gate using a nonlinear resonant cavity based on photonic crystals. Plane wave expansion and finite difference time domain methods were used for calculating the band structure diagram and optical behavior of the optical majority gate, respectively. The proposed structure is ON, when two or three input ports are ON. The maximum time delay of our majority gate is about 5 ps.

Application of photonic crystal based nonlinear ring resonators for realizing all optical 3-to-8 decoder

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Alidoost Rostamizadeh ◽  
Mehdi Taghizadeh ◽  
Jasem Jamali ◽  
Alireza Andalib
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Design Procedure ◽  
Ring Resonators ◽  
Two Dimensional ◽  
Maximum Delay ◽  
All Optical ◽  
Simulation Results ◽  
Difference Time ◽  
Optical Decoder

AbstractOptical decoders are required for optical routing. In this paper we presented the design procedure and simulation results for 3-to-8 optical decoder, which was designed using nonlinear ring resonators inside two dimensional photonic crystals. The proposed structure was simulated using finite difference time domain method. Based on the simulation results the maximum delay time of the structure is about 2 ps. Also the worst transmission values for logic 0 and 1 are 10% and 78%, respectively.

Design and optimization of all-optical demultiplexer using photonic crystals for optical computing applications

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dalai Gowri Sankar Rao ◽  
Mohammed Simran Fathima ◽  
Paila Manjula ◽  
Sandip Swarnakar
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Optical Computing ◽  
Optical Signal ◽  
Design And Optimization ◽  
Integrated Devices ◽  
All Optical ◽  
Difference Time ◽  
Maximum Transmission

AbstractIn this work, photonic crystal (PhC) based all-optical 1 × 2 demultiplexer is designed for optical computing and optical signal processing. The structure is implemented with two-dimensional PhCs using T-shaped waveguides with an optimized silicon rod radius of 0.2a. Performance of the proposed structure is verified and analyzed by using the finite-difference time-domain method. The design of all-optical demultiplexer is operated based on optical interference effect at a wavelength of 1550 nm. Proposed design occupies less area of 8.4 × 5.4 µm, provides a contrast ratio of 18.53 dB, 94.52% of minimum and 100% of maximum transmission ratio and it has less insertion loss of 0.017 dB; therefore, the proposed device is suitable for photonic integrated devices.

scholarly journals From Time-Collocated to Leapfrog Fundamental Schemes for ADI and CDI FDTD Methods

Axioms ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Eng Leong Tan
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Unconditionally Stable ◽  
Alternating Direction Implicit ◽  
One Dimensional ◽  
Alternating Direction ◽  
Fdtd Methods ◽  
Difference Time

The leapfrog schemes have been developed for unconditionally stable alternating-direction implicit (ADI) finite-difference time-domain (FDTD) method, and recently the complying-divergence implicit (CDI) FDTD method. In this paper, the formulations from time-collocated to leapfrog fundamental schemes are presented for ADI and CDI FDTD methods. For the ADI FDTD method, the time-collocated fundamental schemes are implemented using implicit E-E and E-H update procedures, which comprise simple and concise right-hand sides (RHS) in their update equations. From the fundamental implicit E-H scheme, the leapfrog ADI FDTD method is formulated in conventional form, whose RHS are simplified into the leapfrog fundamental scheme with reduced operations and improved efficiency. For the CDI FDTD method, the time-collocated fundamental scheme is presented based on locally one-dimensional (LOD) FDTD method with complying divergence. The formulations from time-collocated to leapfrog schemes are provided, which result in the leapfrog fundamental scheme for CDI FDTD method. Based on their fundamental forms, further insights are given into the relations of leapfrog fundamental schemes for ADI and CDI FDTD methods. The time-collocated fundamental schemes require considerably fewer operations than all conventional ADI, LOD and leapfrog ADI FDTD methods, while the leapfrog fundamental schemes for ADI and CDI FDTD methods constitute the most efficient implicit FDTD schemes to date.

Angle Sensor Based on Golden Spiral–Shaped Tapered Ring Resonator Using Finite Difference Time-Domain Method

2015 ◽  
Vol 781 ◽  
pp. 462-465 ◽  
Author(s):  
S. Harnsoongnoen ◽  
U. Charoen-In ◽  
S. Pattitanang ◽  
C. Auntarin ◽  
N. Angkawisittpan
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Dynamic Range ◽  
Time Domain Method ◽  
Ring Resonators ◽  
Small Scale ◽  
Angle Sensor ◽  
Domain Method ◽  
Difference Time

In this paper, an angle sensor based on coplanar waveguides (CPWs) loaded with golden spiral–shaped tapered ring resonators (GS-RRs) is proposed. The E-fields and H-fields of the GS-RRs were simulated and analyzed using finite difference time-domain method (FDTD). It is shown that the proposed sensor has a high dynamic range and linearity for rotation sensing. The proposed sensor can be operated at a single fixed resonant frequency (6.32 GHz) which is inexpensive and probably for superior interest in a small scale structure using MEMS technology.

scholarly journals All optical binary ASK demodulator using photonic crystal based nonlinear ring resonator

2020 ◽  
Vol 50 (1) ◽  
Author(s):  
Mahsa Narimanzadeh ◽  
Alireza Andalib
Keyword(s):  
Photonic Crystal ◽  
Ring Resonator ◽  
Optical Intensity ◽  
Plane Wave Expansion ◽  
Working Mechanism ◽  
All Optical ◽  
Shift Keying ◽  
Simulation Results ◽  
Optical Behavior ◽  
Difference Time

In this paper we will propose and design an all optical amplitude shift keying demodulator using a photonic crystal based nonlinear ring resonator. The proposed structure will be designed such that it can generate digital 0 and 1 based on the amplitude of the input signal. The working mechanism is based on controlling the optical behavior of the resonant ring using optical intensity. The proposed structure was simulated using plane wave expansion and finite difference time domain methods. The simulation results show that the rise and fall times for the proposed structure are 0.5 and 0.1 ps, respectively.

Sign in / Sign up

Export Citation Format

Share Document