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Left subfigure shows the typical electronic scheme of half adder designed with the combination of AND and XOR gate. A and B are the two inputs while S (sum) and C (carry) are the outputs. Right subfigure shows our scheme of half adder designed with the discrete solitons in waveguide arrays. c in box is a converter modulates the intensity of a input soliton to match that of a control soliton.
Source publication
We present a design and protocol to add binary numbers using discrete solitons in waveguide arrays. We show that the nonlinear interaction between discrete solitons in waveguide arrays can be exploited to design half and full adders. By modulating the separation between waveguides and introducing control solitons, we achieve the performance of an X...
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Citations
... Such technology has the potential to exceed the speed of electronics, while saving more power [36]. The present work is a continuation of our previous works in which switch, diode and logic gates have been proposed [31,37], in addition to our recent design of a scheme and protocol to add binary numbers using discrete solitons in waveguide arrays [38]. ...
We present a design and protocol to achieve an essential feature of an optical transistor, namely the amplification of input signal with the use of discrete solitons in waveguide arrays. We consider the scattering of a discrete soliton by a reflectionless potential in the presence of a control soliton. We show that at the sharp transition region between full reflectance and full transmittance, the intensity of the reflected or transmitted soliton is highly sensitive to the intensity of the control soliton. This suggests a setup of signal amplifier. For realistic purposes, we modulate the parameters of the reflectionless potential well to achieve a performance of amplifier with a controllable amplification. To facilitate the experimental realization, we calculate the amplification factor in terms of the parameters of the potential well and the input power of the control soliton. The suggested signal amplifier device will be an important component in the all-optical data processing.
... In optical systems, they manifest themselves as 'optical solitons', realized through a delicate balance between nonlinearity and dispersion/diffraction which play an indispensable role in long haul communications systems, data processing devices, switching devices, routers and computers [2][3][4][5][6]. In order to realize these functionalities, diverse configurations, namely, photonic circuitry [7], silicon-onsilicon waveguides [8], X-junctions [9], fused-fiber couplers [10], liquid crystals [11,12], nonlinear waveguide arrays [13,14], Mach-Zehnder interferometer [15], etc., [16][17][18][19][20][21] have been proposed. ...
We investigate the dynamics of two component bright-bright (BB) solitons through reflectionless double barrier and double well potentials in the framework of a Manakov system governed by the coupled nonlinear Schr\"{o}dinger equations. The objective is to achieve unidirectional flow and unidirectional segregation/splitting, which may be used in the design of optical data processing devices. We observe how the propagation of composite BB soliton is affected by the presence of interaction coupling between the two components passing through the asymmetric potentials. We consider Gaussian and Rosen-Morse double potential barriers in order to achieve the unidirectional flow. Moreover, we observe a novel phenomenon which we name "\textit{Polarity Reversal}" in the unidirectional flow. In this situation, the polarity of the diode is reversed. To understand the physics underlying these phenomena, we perform a variational calculation where we also achieve unidirectional segregation/splitting using an asymmetric double square potential well. Our comparative study between analytical and numerical analysis lead to an excellent agreement between the two methods.
... In optical systems, they manifest themselves as 'optical solitons', realized through a delicate balance between nonlinearity and dispersion/diffraction which play an indispensable role in long haul communications systems, data processing devices, switching devices, routers and computers [2][3][4][5][6]. In order to realize these functionalities, diverse configurations, namely, photonic circuitry [7], silicon-onsilicon waveguides [8], X-junctions [9], fused-fiber couplers [10], liquid crystals [11,12], nonlinear waveguide arrays [13,14], Mach-Zehnder interferometer [15], etc., [16][17][18][19][20][21] have been proposed. ...
We investigate the dynamics of two component bright-bright (BB) solitons through reflectionless double barrier and double well potentials in the framework of a Manakov system governed by the coupled nonlinear Schrödinger equations. The objective is to achieve unidirectional flow and unidirectional segregation/splitting, which may be used in the design of optical data processing devices. We observe how the propagation of composite BB soliton is affected by the presence of interaction coupling between the two components passing through the asymmetric potentials. We consider Gaussian and Rosen-Morse double potential barriers in order to achieve the unidirectional flow. Moreover, we observe a novel phenomenon which we name ”Polarity Reversal” in the unidirectional flow. In this situation, the polarity of the diode is reversed. To understand the physics underlying these phenomena, we perform a variational calculation where we also achieve unidirectional segregation/splitting using an asymmetric double square potential well. Our comparative study between analytical and numerical analysis lead to an excellent agreement between the two methods.
... Such technology has the potential to exceed the speed of electronics, while saving more power [36]. The present work is a continuation of our previous works in which switch, diode and logic gates have been proposed [31,37], in addition to our recent design of a scheme and protocol to add binary numbers using discrete solitons in waveguide arrays [38]. ...
We present a design and protocol to achieve an essential feature of an optical transistor, namely the amplification of input signal with the use of discrete solitons in waveguide arrays. We consider the scattering of a discrete soliton by a reflectionless potential in the presence of a control soliton. We show that at the sharp transition region between full reflectance and full transmittance, the intensity of the reflected or transmitted soliton is highly sensitive to the intensity of the control soliton. This suggests a setup of signal amplifier. For realistic purposes, we modulate the parameters of the reflectionless potential well to achieve a performance of amplifier with a controllable amplification. To facilitate the experimental realization, we calculate the amplification factor in terms of the parameters of the potential well and the input power of the control soliton. The suggested signal amplifier device will be an important component in the all-optical data processing.
We present a protocol for the quantum controlled-NOT gate which is based on two qubits operation by investigating the soliton scattering through a reflectionless potential well in an optical system. We consider the set up of two input solitons with different intensities scattered by a reflectionless potential well with a control soliton placed at the center of the potential. The two input solitons correspond to the target qubit while either the presence or absence of control soliton in the potential well or the presence or absence of control potential well corresponds to the control qubit. We achieve the desired performance of the quantum logic gate by exploiting the intensity difference between the two input solitons and we find this to be possible within a finite width of a velocity of incidence for the two solitons. The calculation of transport coefficients ensures the feasibility of building a quantum controlled-NOT gate. This protocol demonstrates the prospect of soliton scattering by a potential well for quantum information processing. Especially, the setup with control potential as a control qubit allows realization of the CNOT operation with the negligible amount of radiation.
