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Author: search.filters.author.Sangwara, N.Has files: No

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    An investigation of dark soliton behaviors within the nonlinear micro and nano ring resonators
    (2010-11-01)
    Sangwara, N.
    ;
    Teeka, C.
    ;
    Pipatsart, S.
    ;
    Yupapin, P. P.
    We firstly propose the interesting results of a dark soliton pulse propagating within the nonlinear micro and nano waveguides. The system consists of nonlinear micro and nano ring resonators, whereas the dark soliton is input into the system and traveling within the waveguide. A continuous dark soliton pulse is chopped to be the smaller pulses by the nonlinear effects known as chaos. The nonlinear behaviors such as chaos, bistability and bifurcation are analyzed and discussed. The power amplification is the property that can be used to perform the long distance link, where the security is the dominant reason. © 2009 Elsevier GmbH. All rights reserved.
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    Generalized fast and slow lights using multi-state microring resonators for optical wireless links
    (2010-10-01)
    Pornsuwancharoen, N.
    ;
    Sangwara, N.
    ;
    Yupapin, P. P.
    We propose an interesting result on fast and slow light generation using nonlinear microring resonators. When a soliton pulse is generated within the first ring resonator, the specific signals can be generated using the chaotic filter characteristics of light pulses travelling within the microring devices. We have demonstrated that two different frequency bands can be generated and they are suitable for use in optical wireless links. The other application of fast and slow lights is also presented, whereas signal security can be formed using the add/drop device to retrieve the original signal from the chaotic noisy signals. The key advantage is that the original signal can be kept in secret without any tapping due to the problem of fast light pulses and noisy signals, which are difficult to intercept. © 2009 Elsevier GmbH. All rights reserved.
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    Multi-wavelength generation of an extremely narrow pulse using a ring resonator system for bio-cells microscopy
    (2010-09-01)
    Pornsuwancharoen, N.
    ;
    Youplao, P.
    ;
    Sangwara, N.
    ;
    Yupapin, P. P.
    We propose a new system of an extremely narrow light pulse generation for optical microscopy applications using a nonlinear ring resonator system. The system consists of one nano and three micro-optical ring resonators, which can be used to generate the 50 fm (10<sup>-15</sup> m) optical spectral width at the broad wavelength spectrum. By using a soliton pulse with a pulse width of 50 ps, peak power of 1 W, center wavelength at 550 nm, and after the soliton pulse is launched into the first ring device, the chaotic pulses are generated within the first ring. The chaotic filtering behaviors are performed by using the second and the third ring devices, whereas the extremely short pulse, i.e. narrow spectral width, can be generated by using the extended nano-ring device. The broad spectrum of the harmonic waves is generated and filtered, which is of use in optical tomography. Results obtained have shown that the generation of the broad spectrum of short pulse with width 100 fm and peak power 60 mW is achieved. The possibility of using such a system for nondestructive bio-cells microscopy, for visualizing bio-cells and for bio-cells tomography is also discussed in detail. © 2009 Elsevier GmbH. All rights reserved.
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    Soliton pulses generation and filtering using micro-ring resonators for DWDM-based soliton communication
    (2010-08-01)
    Sangwara, N.
    ;
    Pornsuwancharoen, N.
    ;
    Yupapin, P. P.
    We propose a new optical system that can be used to form the multi-soliton pulses within the micro-ring resonators. The system consists of two micro-ring resonators and an add/drop multiplexer that can be integrated into a single system. The large bandwidth signal is generated by using a soliton pulse propagating in a Kerr-type nonlinear medium. The tuned soliton pulses in either spatial or temporal modes are obtained by using the add/drop multiplexer. Results obtained have shown that the multi-soliton pulses can be localized coherently within the micro-ring waveguide. This is shown that the generation of the multi-soliton pulses within the micro-ring resonator is achieved, which is available for long-distance communication with dense wavelength division multiplexing (DWDM). The significant increase in channel number and spacing are obtained, whereas the large free spectrum range (FSR) of 600 pm is achieved. © 2009 Elsevier GmbH. All rights reserved.