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Ultrafast all-optical ALU operation using a soliton control within the cascaded InGaAsP/InP microring circuits
(2019-02-04)
Soysouvanh, S.
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Phongsanam, P.
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Mitatha, S.
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Ali, J.
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Yupapin, P.
A dark-bright soliton conversion is used to perform the two arithmetic logic unit operations namely adder and subtractor operations. The advantage of the system such as power stability, non-dispersion and the dark-bright soliton phase conversion control can be obtained. The input source into the circuit is the bright soliton pulse, with the pulse width of 35 ps, the peak power at 1.55 µm is 1 mW. By using the dark-bright soliton conversion pair, the generated logic bits can be controlled, and the secure bits can be achieved. The simulation results show the output signal with a minimum loss of only 0.1% with respect to a low input power of 1 mW, and ultra-fast response time of about 1 ps can be achieved. It gives the ultra-high bandwidth of more than 40 Gbits−1. The circuit composes six microring resonators made of InGaAsP/InP material with smaller ring radii of 1.5 µm, and the total physical scale of the circuit less than 100 µm2.
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Ultra-fast electro-optic switching control using a soliton pulse within a modified add-drop multiplexer
(2018-09-01)
Soysouvanh, S.
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Jalil, M. A.
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Amiri, I. S.
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Ali, J.
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Singh, G.
We have proposed the use of a soliton pulse that propagates within a modified add-drop filter, which is made of a GaAsInP/P material. It is in the form of a Panda-ring resonator, from which a bright/dark soliton pulse is input into a system via an input port. The conversion between bright and dark soliton pulses is introduced at the 3 dB coupler, i.e. the change in phase of π/2. But it is not superimposed each other. The output solitons obtained at the through and drop ports are bight and dark solitons respectively. Both signals can be used to form “ON’ and “OFF” or “1” and “0”, which are useful for the digital bit generation. The switching speed of the system can be improved by employing the two nonlinear side rings. In application, secure output bits can be arranged by using the alternative input solitons or the control ports, where the input bright and dark solitons can be converted into output bits. This means that the output bits can be randomly switched between “1” and “0”, which can be identified by the sender. Moreover, the additional information can be multiplexed via the add port and transmitted in either free space or optical fiber via the whispering gallery mode and through port outputs. Finally, the electro-optic switching can be transferred and the electronic switching by the embedded stacked layers, where the ultrafast switching of light input can lead the ultrafast electrical switching speed. The switching speed of ~ 5 fs and the offset time of ~ 220 fs of the “on” and OFF” are achieved by using the selected ring parameters.
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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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All-Optical OFDM Generation for IEEE802.11a Based on Soliton Carriers Using Microring Resonators
(2014-02-01)
Alavi, S. E.
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Amiri, I. S.
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Idrus, S. M.
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Supa'at, A. S.M.
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Ali, J.
The optical carrier generation is the basic building block to implement all-optical orthogonal frequency-division multiplexing (OFDM) transmission. One method to optically generate single and multicarriers is to use the microring resonator (MRR). The MRRs can be used as filter devices, where generation of high-frequency (GHz) soliton signals as single and multicarriers can be performed using suitable system parameters. Here, the optical soliton in a nonlinear fiber MRR system is analyzed, using a modified add/drop system known as a Panda ring resonator connected to an add/drop system. In order to set up a transmission system, i.e., IEEE802.11a, first, 64 uniform optical carriers were generated and separated by a splitter and modulated; afterward, the spectra of the modulated optical subcarriers are overlapped, which results one optical OFDM channel band. The quadrature amplitude modulation (QAM) and 16-QAM are used for modulating the subcarriers. The generated OFDM signal is multiplexed with a single-carrier soliton and transmitted through the single-mode fiber (SMF). After photodetection, the radio frequency (RF) signal was propagated. On the receiver side, the RF signal was optically modulated and processed. The results show the generation of 64 multicarriers evenly spaced in the range from 54.09 to 55.01 GHz, where demodulation of these signals is performed, and the performance of the system is analyzed.
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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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MRR quantum dense coding for optical wireless communication system using decimal convertor
(2012-10-15)
Nikoukar, A.
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Amiri, I. S.
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Shahidinejad, A.
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Shojaei, A. A.
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Ali, J.
In this study, simply two systems consist of series of microring resonators (MRRs) and a add/drop filter are used to generate a large bandwidth signal as localized multi wavelength, applicable for quantum dense coding (QDC) and continuous variable encoding generation using incorporated system. This technique uses the Kerr nonlinear type of light in the MRR to generate multi wavelength for desired application especially in internet security and quantum network cryptography. Quantum dense encoding can be perform by output signals of selected wavelengths which are incorporated to a polarization control system in which dark and bright optical soliton pulses with different time slot are generated. Generated dark and bright optical pulses can be converted into digital logic quantum codes using a decimal convertor system in which transmission of secured information are perform via a wireless network communication system. Results show that multi soliton wavelength, ranged from 1.55μm to 1.56μm with FWHM and FSR of 10 pm and 600 pm can be generated respectively. © 2012 IEEE.
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Multi optical Soliton generated by PANDA ring resonator for secure network communication
(2012-10-15)
Amiri, I. S.
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Ranjbar, M.
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Nikoukar, A.
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Shahidinejad, A.
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Ali, J.
In this study, new system of quantum cryptography for network communication is proposed. Multi optical Soliton can be generated and propagate via a nonlinear modified add/drop interferometer system incorporated with a time division multiple access (TDMA) system wherein the transportation of quantum codes is performed. To increase the channel capacity and security of the signals, the PANDA ring resonator is proposed. Chaotic output signals from the PANDA ring resonator are input into the add/drop filter system. Chaotic signals can be filtered by using the add/drop filter system in which multi dark and bright solitons can be obtained and used to generate entangled quantum codes for internet security. In this study soliton pulses with FWHM and FSR of 325 pm and 880 nm are generated, respectively, where the Gaussian pulse with a centre wavelength of 1.55 μm and power of 600 mW is input into the system. © 2012 IEEE.
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Generation of discrete frequency and wavelength for secured computer networks system using integrated ring resonators
(2012-10-15)
Amiri, I. S.
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Sarkhanlou, K.
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Nikoukar, A.
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Shahidinejad, A.
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Ali, J.
In this study, a system of discrete optical pulse generation via a series of microring resonator (MRR) is presented. Chaotic signals can be generated by an optical soliton or a Gaussian pulse within a MRR system. Large bandwidth signals of optical soliton are generated by input pulse propagating within the MRRs, which can be used to form continuous wavelength or frequency with large tunable channel capacity. Therefore, distinguished discrete wavelength or frequency pulses can be generated by using localized spatial pulses via a networks communication system. Selected discrete pulses are more suitable to generate high-secured quantum codes because of the large free spectral range (FSR). Quantum codes can be generated by using a polarization control unit and a beam splitter, incorporating to the MRRs. In this work, frequency band of 10.7 MHz and 16 MHz and wavelengths of 206.9 nm, 1448 nm, 2169 nm and 2489 nm are localized and obtained which can be used for quantum codes generation applicable for secured networks communication. © 2012 IEEE.
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Network system engineering by controlling the chaotic signals using silicon micro ring resonator
(2012-10-15)
Shahidinejad, A.
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Nikoukar, A.
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Amiri, I. S.
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Ranjbar, M.
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Shojaei, A. A.
We investigate nonlinear behaviors of light known as bifurcation and chaos within a nonlinear silicon microring resonator (SMRR). The research is used to controlling SMRR's behaviors such as chaos applicable in security coding systems. The variable parameters affect the bifurcation to be happened in smaller roundtrip among total round trip of 20000 or input power. Simulated Results show that rising of the nonlinear refractive indices, coupling coefficients and radius of the SMRR leads to descending in input power and round trips wherein the bifurcation occurs. As result, bifurcation or chaos behaviors are seen at lower input power of 44 W, where the nonlinear refractive index is n <inf>2</inf>=3.2×10 -20 m 2/W. Smallest round trips of 4770 and 5720 can be seen for the R=40 μm and κ = 0.1 respectively. The controlled chaotic signals from the SMRR are passing through a polarizer beam splitter to generate quantum binary codes which are used in wireless network communication. © 2012 IEEE.
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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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