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Analysis of optical ring resonator
(2015-01-01)
Afroozeh, A.
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Amiri, I. S.
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Chaudhary, K.
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Ali, J.
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Yupapin, P. P.
Microring resonators (MRR) are defined as filters with characteristics similar to Fabry-Perot filters. However, they offer an advantage as the injected and reflected signals are separated in individual waveguides. In addition, their design does not require any facets or gratings and is thus practically simple. In this chapter, analyses of microrings based on three configurations are presented.
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THz frequency generation using Gaussian pulse for medical applications
(2013-03-01)
Afroozeh, A.
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Innate, K.
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Ali, J.
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Yupapin, P. P.
We propose a new design of THz frequency carrier generation for medical applications. The dense wavelength division multiplexing can be generated by using a Gaussian pulse propagating within a modified PANDA ring resonator and add-drop filter. Results obtained have shown that broad region of frequency band can be obtained between 30 and 100 THz. This area of frequency band can be useful for medical applications, in which the broad bandwidth of THz signals can be obtained and available for medical applications, for instance, the use of Terahertz pulse imaging (TPI) and signal transduction therapy, especially, for blood vessel extraction are discussed. © 2012 Elsevier GmbH. All rights reserved.
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Fast light generation using GaAlAs/GaAs waveguide
(2012-12-01)
Afroozeh, A.
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Bahadoran, M.
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Amiri, I. S.
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Samavati, A. R.
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Ali, J.
Generation of fast light pulses through a nonlinear microring system is an attractive research challenge for high speed optical and quantum computer, optical communication networks and secured communication. In this paper generation of fast light through GaAlAs/GaAs waveguides with fabricated Micro Ring Resonator is reported. Using multistage system, the attosecond pulse can be generated. Simulation results obtained have shown that the generation of a very narrow full-width at half maximum (FWHM) line width and sharp tip is achieved. We propose a new system of multistage micro ring resonators consist of four rings for optical communication system. Here, pulse width of 15 attosecond can be obtained, using proper parameters of the proposed system. © Penerbit UTM Press, Universiti Teknologi Malaysia.
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THz frequency generation using MRRs for THz imaging
(2012-03-15)
Afroozeh, A.
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Amiri, I. S.
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Samavati, A. R.
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Ali, J.
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Yupapin, Preecha
We propose a new design of THz frequency carrier generation for medical applications. The dense wavelength division multiplexing can be generated by using a Gaussian pulse propagating within a modified PANDA ring resonator and Add/drop filter. Results obtained have shown that region of frequency can be obtained between 30-100 THz. This area of frequency band can be used for medical applications. The broad bandwidth of THz signals can be obtained and available for medical applications, for instance, Terahertz pulsed imaging (TPI). THz imaging for histopathological diagnosis has been successful investigated method, where THz waves are useful for analysis of the histological features, without any painful process. It has been confirmed that the THz radiations have different transmittance through healthy tissues, where the tissues effected by cancer [1, 2]. © 2012 IEEE.
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Nano radio and RoF applications
(2012-01-01)
Pipatsart, S.
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Afroozeh, A.
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Ali, J.
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Yupapin, P. P.
A new design of THz frequency carrier generation for radio frequency identification (RFID) application is proposed. The dense wavelength division multiplexing can be generated and obtained by using a Gaussian or soliton pulses propagating within a modified add-drop filter known as a PANDA ring resonator. The broad bandwidth of THz signals can be obtained and available for useful applications, in which the use of the generated THz pulses for RFID application, for instance, Ad-Hoc network using RFID. Results obtained have shown that the increasing in channel capacity can be obtained and useful for the large demand of RFID applications. © 2010 Published by Elsevier Ltd. © 2010 Published by Elsevier Ltd.
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Generation of quantum codes using up and down link optical soliton
(2011-12-01)
Amiri, I. S.
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Afroozeh, A.
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Ali, J.
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Yupapin, P. P.
In this study, a system of continuous variable quantum code via a wavelength router is presented. The optical Kerr type nonlinearity in the nonlinear microring resonator (NMRR) induces the chaotic behavior. In this proposed system chaotic signals are generated by an optical soliton or Gaussian pulse within a NMRR system. Large bandwidth signals of optical soliton are generated by the input pulse propagating within the MRRs, which is allowed to form the continuous wavelength or frequency with large tunable channel capacity. Therefore, distinguished up and down links of wavelength or frequency pulses can be generated by using localized spatial soliton via a quantum router and networks. These selected up and down links pulses are more suitable to generate high secured quantum codes because of the greater free spectral range (FSR). The continuous quantum codes can be generated by using the polarization control unit and beam splitter, incorporating into the MRRs. In this work, frequency band of 10.7 MHz and 16 MHz and wavelengths of 206.9 nm, 1.448 μm, 2.169 μm and 2.489 μm can be obtained for QKD by using input optical soliton and Gaussian beam. © Penerbit UTM Press, Universiti Teknologi Malaysia.
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Determination of FWHM for soliton trapping
(2011-12-01)
Afroozeh, A.
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Amiri, I. S.
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Ali, J.
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Yupapin, P. P.
In this study an interesting system in which a bright and dark soliton pulse can be stopped inside a nonlinear waveguide is presented. Here, we propose a system consisting of a series of ring resonators for optical trapping within a nonlinear waveguide. The bright and dark solitons can be controlled and slowed down within the waveguide. The FWHM for the output signals are calculated and used as an optical memory. Bright and dark soliton behaviors within a micro and nano ring resonator are also investigated and described. The required pulse is filtered and amplified, can be controlled and localized within the system. The localized bright and dark solitons are stopped by controlling the input power, which means that the photon stopping can be controlled by light in a ring resonator. © Penerbit UTM Press, Universiti Teknologi Malaysia.
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Optical dark and bright soliton generation and amplification
(2011-11-11)
Afroozeh, A.
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Amiri, I. S.
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Kouhnavard, M.
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Jalil, M. A.
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Ali, J.
We propose two designed systems consist of series of micro ring resonator (MRR) and an add/drop multiplexer in which the optical dark and bright soliton pulse propagating within the nonlinear waveguides can be amplified which can be used in long communication system. The dark or bright soliton is input into designed systems and travels within the waveguide. A continuous soliton pulse is sliced into smaller pulses by the nonlinear effect which is known as chaos. In this way large bandwidth of optical signals can be obtained. The power amplification occurs when the soliton propagates along the MRRs or add/drop systems. The add/drop multiplexer system can itself be used to amplify the optical soliton when the bright soliton is input at the drop part of the system. In this work we have studied the generation of amplified pulse of optical dark and bright soliton when they propagating inside single systems or when they interact and collide during propagation inside an add/drop device. It means that amplified soliton pulse also can be obtained when two types of soliton i.e., dark and bright soliton collide with each other in a same system. In such a way the amplified dark soliton or bright soliton can be used to perform the long distance link. © 2011 American Institute of Physics.
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QKD via a quantum wavelength router using spatial soliton
(2011-08-08)
Kouhnavard, M.
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Amiri, I. S.
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Afroozeh, A.
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Jalil, M. A.
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Ali, J.
A system for continuous variable quantum key distribution via a wavelength router is proposed. The Kerr type of light in the nonlinear microring resonator (NMRR) induces the chaotic behavior. In this proposed system chaotic signals are generated by an optical soliton or Gaussian pulse within a NMRR system. The parameters, such as input power, MRRs radii and coupling coefficients can change and plays important role in determining the results in which the continuous signals are generated spreading over the spectrum. Large bandwidth signals of optical soliton are generated by the input pulse propagating within the MRRs, which is allowed to form the continuous wavelength or frequency with large tunable channel capacity. The continuous variable QKD is formed by using the localized spatial soliton pulses via a quantum router and networks. The selected optical spatial pulse can be used to perform the secure communication network. Here the entangled photon generated by chaotic signals has been analyzed. The continuous entangled photon is generated by using the polarization control unit incorporating into the MRRs, required to provide the continuous variable QKD. Results obtained have shown that the application of such a system for the simultaneous continuous variable quantum cryptography can be used in the mobile telephone hand set and networks. In this study frequency band of 500 MHz and 2.0 GHz and wavelengths of 775nm, 2,325nm and 1.55 ìm can be obtained for QKD use with input optical soliton and Gaussian beam respectively. © 2011 American Institute of Physics.
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Capacity enhancement in communication system via NNRR
(2011-05-02)
Aziz, M. S.
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Afroozeh, A.
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Roslan, M. S.
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Jalil, M. A.
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Nawi, I. N.
We present the effect of the FSR on capacity of communication system. A new novel system of soliton generation using a 1.30 μm optical Gaussian pulse in a nonlinear nano-ring resonator (NNRR) system forms the soliton pulse train. The soliton pulse wavelength with center wavelength at 1.30 μm is generated after a powerful Gaussian soliton pulse is input into the NNRR system, we propose a system that can be used to solve many problems in communication systems. The results show that we how do receive the free spectrum range (FSR) by NNRR. This is obtained via the add/drop filter, which can be used to increase the channel capacity in the communication network. In this paper the best FSR is 0.052 nm. This result allows the channel capacity expanding due to the abundance of propagation spacing from the soliton collision.

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