scholarly journals A Novel Design of All-optical Full-adder Using Nonlinear X-shaped Photonic Crystal Resonators

2021 ◽  
Author(s):  
Saleh Naghizade ◽  
Hamed Saghaei
Keyword(s):  
Photonic Crystal ◽  
High Speed ◽  
Light Propagation ◽  
Full Adder ◽  
All Optical ◽  
High Speed Data ◽  
Doped Glass ◽  
Photonic Band ◽  
Novel Design ◽  
Incoming Light

Abstract This paper proposes a new all-optical full-adder design based on nonlinear X-shaped photonic crystal (PhC) resonators. The PhC-based full-adder consists of three input ports, two X-shaped PhC resonators (X-PCRs), and two output ports. The dielectric rods made of silicon and nonlinear rods composed of doped glass are used to design the X-PCRs. Two well-known plane wave expansion and finite difference time domain methods are applied to study and analyze the photonic band structure and light propagation inside the PhC, respectively. Our numerical results demonstrate when the incoming light intensity increases, the nonlinear Kerr effect appears and manages the direction of light propagation inside the structure. The maximum time delay and footprint of the proposed full-adder are about 2.5ps and 663 μm2, making it an appropriate adder for high-speed data processing systems.

All-Optical XOR, XNOR, NAND and OR Logic Gates Based on Photonic Crystal 3-DB Coupler for BPSK Signals

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Afsaneh Heydari ◽  
Ali Bahrami ◽  
Abbas Mahmoodi
Keyword(s):  
Photonic Crystal ◽  
Light Propagation ◽  
Photonic Band Gap ◽  
Logic Gates ◽  
Square Lattice ◽  
Logical Function ◽  
Compact Structure ◽  
All Optical ◽  
Logic Functions ◽  
Photonic Band

AbstractWe propose a very compact structure for all-optical XOR, XNOR, NAND and OR logic gates based on photonic crystal 3-dB coupler in binary-phase-shift-keyed (BPSK) signals. The square lattice of dielectric rods in SiO2 background has been considered for photonic crystal structure. The photonic band gap (PBG) and light propagation simulations of proposed logic structure have been accomplished by plane wave expansion and finite difference time domain methods. The proposed structure can achieve logical function when the refractive index of all rods and substrate is fabricated with relaxed error tolerance within −0.005 to 0.005 from designed parameters. The proposed logic functions may potentially be used as key components in all-optical information networks for processing the BPSK signals.

A high speed all optical half adder using photonic crystal based nonlinear ring resonators

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Alireza Shamsi
Keyword(s):  
Photonic Crystal ◽  
Rise Time ◽  
High Speed ◽  
Ring Resonators ◽  
Optical Intensity ◽  
Working Mechanism ◽  
Central Wavelength ◽  
Half Adder ◽  
All Optical ◽  
Doped Glass

Abstract In this paper a high speed optical half adder is designed. The working mechanism of the proposed structure is based on optical threshold switching. Three nonlinear ring resonators are used for this purpose. These nonlinear ring resonators are created by adding doped glass based rods inside the resonant rings. The proposed structure works with optical waves with central wavelength and optical intensity equal to 1550 nm and 1 W/μm2 respectively. The rise time is 2 ps.

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

2021 ◽  
Author(s):  
Saleh Naghizade ◽  
Hamed Saghaei
Keyword(s):  
Time Delay ◽  
Light Propagation ◽  
Resonant Cavity ◽  
Full Adder ◽  
Resonant Cavities ◽  
Expansion Technique ◽  
All Optical ◽  
Small Footprint ◽  
Silicon Rods ◽  
Doped Glass

Abstract In this paper, we report a new design of all-optical full-adder using two nonlinear resonators. The PhC-based 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 finite-difference time-domain 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 µm2, 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.

An all optical photonic crystal half adder suitable for optical processing applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hamed Azhdari ◽  
Sahel Javahernia
Keyword(s):  
Photonic Crystal ◽  
Optical Waveguides ◽  
High Speed ◽  
Building Blocks ◽  
Optical Signal ◽  
Ring Resonators ◽  
Optical Processing ◽  
Nonlinear Photonic Crystal ◽  
Half Adder ◽  
All Optical

Abstract Increasing the speed of operation in all optical signal processing is very important. For reaching this goal one needs high speed optical devices. Optical half adders are one of the important building blocks required in optical processing. In this paper an optical half adder was proposed by combining nonlinear photonic crystal ring resonators with optical waveguides. Finite difference time domain method wase used for simulating the final structure. The simulation results confirmed that the rise time for the proposed structure is about 1 ps.

scholarly journals Dual-shot dynamics and ultimate frequency of all-optical magnetic recording on GdFeCo

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Sicong Wang ◽  
Chen Wei ◽  
Yuanhua Feng ◽  
Hongkun Cao ◽  
Wenzhe Li ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Energy Efficient ◽  
High Speed ◽  
Data Transfer ◽  
Laser Pulses ◽  
Time Resolved ◽  
All Optical ◽  
Fs Laser ◽  
High Speed Data ◽  
Natural Way

AbstractAlthough photonics presents the fastest and most energy-efficient method of data transfer, magnetism still offers the cheapest and most natural way to store data. The ultrafast and energy-efficient optical control of magnetism is presently a missing technological link that prevents us from reaching the next evolution in information processing. The discovery of all-optical magnetization reversal in GdFeCo with the help of 100 fs laser pulses has further aroused intense interest in this compelling problem. Although the applicability of this approach to high-speed data processing depends vitally on the maximum repetition rate of the switching, the latter remains virtually unknown. Here we experimentally unveil the ultimate frequency of repetitive all-optical magnetization reversal through time-resolved studies of the dual-shot magnetization dynamics in Gd27Fe63.87Co9.13. Varying the intensities of the shots and the shot-to-shot separation, we reveal the conditions for ultrafast writing and the fastest possible restoration of magnetic bits. It is shown that although magnetic writing launched by the first shot is completed after 100 ps, a reliable rewriting of the bit by the second shot requires separating the shots by at least 300 ps. Using two shots partially overlapping in space and minimally separated by 300 ps, we demonstrate an approach for GHz magnetic writing that can be scaled down to sizes below the diffraction limit.

A Novel Design of All Optical Logical AND Gate Based on 2‐D Photonic Crystal

2021 ◽  
Vol 397 (1) ◽  
pp. 2000341
Author(s):  
Anil Kumar Shukla ◽  
Girijesh Narayan Pandey
Keyword(s):  
Photonic Crystal ◽  
All Optical ◽  
Novel Design

A New Proposal for Ultra-Compact Polarization Independent Power Splitter Based on Photonic Crystal Structures

2018 ◽  
Vol 39 (4) ◽  
pp. 375-379 ◽  
Author(s):  
Hadi Razmi ◽  
Mohammad Soroosh ◽  
Yousef S. Kavian
Keyword(s):  
Photonic Crystal ◽  
Crystal Structures ◽  
Optical Networks ◽  
Photonic Band Gap ◽  
Transmission Efficiency ◽  
Optical Polarization ◽  
Power Splitter ◽  
All Optical ◽  
Photonic Band ◽  
Polarization Independent

Abstract Polarization dependency imposes great limitations for application of optical device in optical networks and systems. In this paper, we are going to design and propose a 1*2 all optical polarization independent power splitter based on photonic crystal structures. For designing such a device we should employ a fundamental photonic crystal structure which has joint photonic band gap. The obtained results show that at 1,560 nm wavelength the final structure has transmission efficiency equal to 45 % for outputs in both TE and TM modes.

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