All-Optical Switches and All-Optical Bistability by Nonlinear Optical Materials

1992 ◽  
Vol 247 ◽  
Author(s):  
K. Sasaki ◽  
S. Sasaki ◽  
O. Furukawa
Keyword(s):  
Optical Materials ◽  
High Speed ◽  
Optical Bistability ◽  
Directional Coupler ◽  
Basic Structure ◽  
Optical Switches ◽  
All Optical ◽  
Coupling Parameters ◽  
Layered Waveguide ◽  
High Speed Switching

ABSTRACTAll-optical switches and all-optical bistabili ties are realized by waveguide structures with vacuum evaporated polydiacetylene(PDA) films. The basic structure of the all-optical switches are prepared in the form of layered waveguide directional coupler with vacuum evaporated PDA top layer. Clearly switchings are observed at 1064nm of pulsed Nd:YAG laser. Furthermore ultra-high speed switching with Ti;Safire 135fs laser are recognized.Operations of all-optical bistabilities are carried out by nonlinear coupling at grating structures in waveguides with PDA top layers. Hysterisis curves of bistability are affected by coupling parameters of gratings and parameters of waveguides.

scholarly journals Tunable Optical Bistability, Tristability and Multistability in Arrays of Graphene

2020 ◽  
Vol 10 (17) ◽  
pp. 5766
Author(s):  
Xiuju Zhao ◽  
Bin Xu ◽  
Xiangna Kong ◽  
Dong Zhong ◽  
Ming Fang ◽  
...  
Keyword(s):  
Optical Bistability ◽  
Chemical Potential ◽  
Incident Light ◽  
Logic Gates ◽  
Optical Switches ◽  
Optical Logic ◽  
Incident Intensity ◽  
Incident Wavelength ◽  
All Optical ◽  
Potential Applications

The optical bistability, tristability and multistability are explored in arrays of graphene. The arrays are periodically arranged spatially by single sheets of graphene. Optical bistability could be achieved with a strong enough incident intensity of light wave. The thresholds of optical bistability and the intervals between the upper and lower thresholds change with the surface conductivity of graphene and the incident wavelength. By increasing the intensity of incident light, tristability and multistability can be induced as well. Furthermore, the thresholds of bistability, tristability and multistability can be regulated via the chemical potential of graphene. This study may have potential applications in optical logic gates, all-optical switches and photomemory.

Comparison of interferometric all-optical switches for demultiplexing applications in high-speed OTDM systems

2002 ◽  
Vol 20 (4) ◽  
pp. 618-624 ◽  
Author(s):  
C. Schubert ◽  
J. Berger ◽  
S. Diez ◽  
H.J. Ehrke ◽  
R. Ludwig ◽  
...  
Keyword(s):  
High Speed ◽  
Optical Switches ◽  
All Optical

All-Optical Bistability in Nonlinear Directional Coupler Loaded with Bragg Reflector

1999 ◽  
Author(s):  
K. Nakatsuhara ◽  
S. H. Jeong ◽  
S. Hssain ◽  
T. Mizumoto ◽  
B. J. Ma ◽  
...  
Keyword(s):  
Optical Bistability ◽  
Directional Coupler ◽  
Bragg Reflector ◽  
All Optical ◽  
Nonlinear Directional Coupler

Performance evaluation of GaAs photonic crystal based directional coupler all optical switch

2018 ◽  
Vol 7 (3.29) ◽  
pp. 220
Author(s):  
Sivasindhu M ◽  
P Samundiswary
Keyword(s):  
Performance Evaluation ◽  
Photonic Crystal ◽  
Integrated Circuits ◽  
High Speed ◽  
Directional Coupler ◽  
Optical Switch ◽  
Optical Filters ◽  
Optical Signals ◽  
All Optical ◽  
All Optical Switch

In future, the telecommunication systems will be totally based upon the photonic integrated circuits and components for the transmission of optical signals. Since optical signals offer high speed, less delay and higher efficiency. This introduces a new research area for photonic crystal based optical components like optical switch, multiplexer, optical filters etc. Among these devices, the optical switch draws more attention due to its primary switching operation. Hence, this paper deals with the modified design structure of GaAs photonic crystal based directional coupler all optical switch which operates at the wavelength of 1300nm. Further the switching performance evaluation of this device is made for both electro optic effect and non-linear optical effect. The design and simulation of the optical switch is done through Comsol Multiphysics software.   

Time-resolved chirp properties of semiconductor optical amplifiers in high-speed all-optical switches

2013 ◽  
Vol 52 (3) ◽  
pp. 035003 ◽  
Author(s):  
Ligong Chen ◽  
Rongguo Lu ◽  
Shangjian Zhang ◽  
Jianfeng Li ◽  
Yong Liu
Keyword(s):  
High Speed ◽  
Optical Amplifiers ◽  
Semiconductor Optical Amplifiers ◽  
Optical Switches ◽  
Time Resolved ◽  
All Optical

scholarly journals Experimental and theoretical investigation of the impact of ultra-fast carrier dynamics on high-speed SOA-based all-optical switches

2006 ◽  
Vol 14 (1) ◽  
pp. 331 ◽  
Author(s):  
Mads L. Nielsen ◽  
Jesper Mørk ◽  
Rei Suzuki ◽  
Jun Sakaguchi ◽  
Yoshiyasu Ueno
Keyword(s):  
Theoretical Investigation ◽  
High Speed ◽  
Optical Switches ◽  
Carrier Dynamics ◽  
All Optical ◽  
The Impact

scholarly journals Investigations and Simulations of All optical Switches in linear state Based on Photonic Crystal Directional Coupler

2014 ◽  
Vol 3 (1) ◽  
pp. 66 ◽  
Author(s):  
S. Maktoobi ◽  
R. Ghayour
Keyword(s):  
Signal Processing ◽  
Photonic Crystal ◽  
Optical Switching ◽  
Directional Coupler ◽  
Optical Signal ◽  
Optical Switches ◽  
Crystal Lattices ◽  
All Optical ◽  
Signal Processing Systems ◽  
Linear State

Switching is a principle process in digital computers and signal processing systems. The growth of optical signal processing systems, draws particular attention to design of ultra-fast optical switches. In this paper, All Optical Switches in linear state Based On photonic crystal Directional coupler is analyzed and simulated. Among different methods, the finite difference time domain method (FDTD) is a preferable method and is used. We have studied the application of photonic crystal lattices, the physics of optical switching and photonic crystal Directional coupler. In this paper, Electric field intensity and the power output that are two factors to improve the switching performance and the device efficiency are investigated and simulated. All simulations are performed by COMSOL software.

scholarly journals Terahertz Optical Bistability in the Metal Nanoparticles-Graphene Nanodisks-Quantum Dots Hybrid Systems

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2173
Author(s):  
Mariam M. Tohari
Keyword(s):  
Quantum Dots ◽  
Metal Nanoparticles ◽  
Optical Bistability ◽  
Ring Cavity ◽  
Optical Switches ◽  
Geometrical Features ◽  
All Optical ◽  
Graphene Nanodisks ◽  
And Control ◽  
Optical Ring

We theoretically investigate the optical bistability in the metal nanoparticles-graphene nanodisks-quantum dots hybrid plasmonic system in the infrared regime of the electromagnetic radiation. The quantum dot is considered to be a three-level atomic-like system of Λ type interacting with probe and control fields. By using the standard model of the optical bistability where a nonlinear medium is situated in an optical ring cavity, we numerically solve the equation of motion for the density matrix elements that describe the dynamics of the system in steady-state conditions along with the boundary conditions of the cavity to analyze the optical bistability of the system. The effect of the geometrical features of the system and the parameters of the interacting fields including the strength and detuning of the fields on the optical bistability behavior are investigated. Our proposed hybrid plasmonic system shows an ultralow-threshold controllable optical bistability, providing a promising platform for optical bistable devices at the terahertz, such as all-optical switches and biosensors.

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