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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.
;
Ali, J.
;
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<sup>−1</sup>. 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 µm<sup>2</sup>.
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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.
;
Jalil, M. A.
;
Amiri, I. S.
;
Ali, J.
;
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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Dynamic measurement of thin liquid film parameters using high-speed ellipsometry
(1998-02-15)
Yupapin, P. V.P.
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Chitaree, R.
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Palmer, A. W.
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Grattan, K. T.V.
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Weir, K.
The feasibility of the measurement of dynamic, thin liquid film properties using an ellipsometer-based fibre-optic modulation technique is presented. The essence of this technique is that a dynamic measurement of film parameters such as refractive index and Fresnel reflection coefficients may be simultaneously and automatically made, from which the instantaneous changes of liquid film thickness may be characterized. Such a scheme is discussed where a measurement rate of 25 Hz has been used to illustrate the value of the system in the monitoring of spreading liquid films. © 1998 Elsevier Science S.A.
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Classification of UV-Vis spectroscopic data using principal component analysis and neural network techniques
(1998-01-01)
Benjathapanun, N.
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Boyle, W. J.O.
;
Grattan, K. T.V.
This paper presents a comparative study of the use of principal component analysis (PCA) and neural network methods to determine the nature of species present in multicomponent mixtures from ultraviolet-visible (UV-Vis) absorption spectral data. With the use of the PCA technique, absorption spectra with a 316-dimensional space are reduced to six principal components and then classified using the K nearest-neighbor method. By contrast, with the neural network technique, absorption spectra are transformed to represent the spectral shape information by binary encoding segments of the second derivative of the absorption spectra and then classifying using a back propagation neural network algorithm. It is found that the neural network method offers better performance with a higher accuracy than use of the PCA method. © 1998 Elsevier Science Ltd. All rights reserved.
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Intelligent UV-Vis Spectrometry for Water and Environment Monitoring using GUI Software and Neural Networks
(1996-01-01)
Benjathapanun, N.
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Boyle, W. J.O.
;
Grattan, K. T.V.
This paper describes an Intelligent UV-Vis Spectrometry system using GUI software and neural network techniques for the identification and estimation of UV absorbing chemical species in water.
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A study of polarizationÃ¢â ¬Â maintaining fiber characteristics with applications to force and displacement sensing
(1995-01-01)
Yupapin, P. V.P.
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Weir, K.
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Grattan, K. T.V.
;
Palmer, A. W.
An experimental investigation of three different types of highly birefringent fiber sensor element configured as a force and a displacement sensor is described. From the coupling of power between the two eigenmodes, the magnitude of the force and the position of the coupling point can then be determined using Ã¢â¬ËwhiteÃ¢â¬Âlight interferometricÃ¢â¬â¢ techniques. © 1995, Laser Institute of America. All rights reserved.

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