Pipatsart, Surasak

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Pipatsart, Surasak
Alternative Name
Pipatsart, S.
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Email
surasak.pi@kmitl.ac.th

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    An optical tunable band-pass filter using chaotic signals in a nonlinear micro ring resonator
    (2008-05-15)
    Yupapin, P. P.
    ;
    Suwancharoen, W.
    ;
    Pipatsart, S.
    We propose a design of a tunable band-pass filtering device using an optical micro ring resonator. Such a device can be used to generate the required filtering signals in the optical communication transmission line. In principle, the chaotic signals are generated by a Kerr effects nonlinear type via a micro ring resonator. The input power can be used to control the specific filtering signals. The required information can be retrieved from the chaotic signals by using the specific filter, i.e. the specified users. The ring parameters used with the ring radii are ranged between 10-20 μm, and n<inf>2</inf> = 2.2 × 10<sup>-15</sup> m<sup>2</sup>/W. The simulation results obtained have shown the potential of using such a proposed device as tunable band-pass or band-stop filters, which can be used to form the information security.
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    An aerosol optical thickness investigation in the Suvarnabhumi airport using an inexpensive sunphotometer
    (2008-05-15)
    Udomwech, K.
    ;
    Yupapin, P. P.
    ;
    Pipatsart, S.
    An investigation of the optical thickness of the aerosol surrounded in the Suvranabhumi airport area using the local constructed sun-photometer is reported. The measurement data obtained are presented comparing to the ones obtained by the standard sun-photometer, where the measurement error of 5 % is obtained. The measurement was implemented within a three months period, starting from November 1th, 2006. The optical thickness obtained of 0.45 is noted, which is described in term of air quality as transparent view. Such effects may be introduced by the airplane fuel waste, infrastructure constructions and industrial estates. Further, the effects of the climate changes and global warming around the investigated area, and wireless communication link degradation are discussed.
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    Item type:Publication,
    A proposal of all-wavelength optical amplifiers
    (2009-01-01)
    Pipatsart, Surasak
    ;
    Dunmeekaew, Ura
    ;
    Pornsuwancharoen, Nithiroth
    ;
    Yupapina, Preecha P.
    We have shown the interesting results of the optical signal amplifications using a Gaussian pulse propagating within a nonlinear microring resonator system. Several Gaussian pulses with different center wavelengths, for instance, 400-1,500 nm are investigated using the designed system. Results have shown that the optical signal amplification using the nonlinear ring resonator is plausible. By using the input power of 2 W, the optical output of 15 W is achieved. The interesting aspect is that all Gaussian input wavelengths can be amplified which can be useful for other wavelengths in future communication. © 2009 Elsevier B.V. All rights reserved.