Proposal for all optical comparator using nonlinear PhC-based cavities

2021 ◽  
Author(s):  
Mohammad Dadras Jeddi Pishkhani
Keyword(s):  
Output Port ◽  
Resonant Cavities ◽  
Threshold Switching ◽  
All Optical

Abstract In this paper an all optical comparator was designed and simulated. The proposed structure works using nonlinear threshold switching that was implemented by application of nonlinear resonant cavities. X and Y are the input ports of the proposed structure using different combination of these input ports one can control that which bias port can be connected to its corresponding output port. O1 is ON when X is ON and Y is OFF, O2 is ON when Y is ON and X is OFF, and O3 is ON when both X and Y have similar states.

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.

A Four-Channel Optical Demultiplexer Using Photonic Crystal-Based Resonant Cavities

2018 ◽  
Vol 39 (4) ◽  
pp. 369-373 ◽  
Author(s):  
Hassan Absalan
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Resonant Cavity ◽  
Resonant Mode ◽  
Two Dimensional ◽  
Resonant Cavities ◽  
Optical Channels ◽  
All Optical ◽  
Do So

Abstract The aim of this paper was to propose and design an all optical four-channel demultiplexer using two-dimensional photonic crystals. To do so a resonant cavity was created by reducing the radius of the two adjacent rods. The radius of these defect rods was about 85 nm. The resonant cavity has a resonant mode at 1,557 nm. Then by using four resonant cavities with different radius values a four-channel optical demultiplexer was designed. The demultiplexer has four optical channels at λ1=1,537 nm, λ2=1,546 nm, λ3=1,553 nm and λ4=1,560 nm.

Eight-channel all-optical demultiplexer based on photonic crystal resonant cavities

Optik ◽  
2017 ◽  
Vol 140 ◽  
pp. 331-337 ◽  
Author(s):  
Reza Talebzadeh ◽  
Mohammad Soroosh ◽  
Yousef S. Kavian ◽  
Farhad Mehdizadeh
Keyword(s):  
Photonic Crystal ◽  
Resonant Cavities ◽  
All Optical

All optical half subtractor based on threshold switching and beams interference mechanisms

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Asghar Askarian
Keyword(s):  
Steady State ◽  
Photonic Crystal ◽  
Ring Resonator ◽  
Contrast Ratio ◽  
High Contrast ◽  
Threshold Switching ◽  
All Optical ◽  
Simulation Results ◽  
Maximum Rise

AbstractIn this paper, ultra-fast, compact and high contrast ratio all optical half subtractor based on photonic crystal designed and simulated. The proposed design will be constructed using both threshold switching and interference of beams mechanisms. The proposed structure is composed of six waveguides and a nonlinear ring resonator. The simulation results show that the contrast ratio for D and B ports were obtained about 18.80 and 15.05 dB, respectively. Also the maximum rise, fall and steady-state times and total footprint for suggested all optical half subtractor are 0.5, 0.25, 1.5 ps and 234 μm2, respectively.

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