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Author: search.filters.author.Yupapin, Preecha P.Subject: search.filters.subject.ring resonator

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    Optical private tunnel using a ring resonator system for security communication
    (2013-12-31)
    Juleang, Pakorn
    ;
    Mitatha, Somsak
    ;
    Yupapin, Preecha P.
    We propose optical private tunnel using the dark-bright soliton conversion control in a modified add/drop optical filter. By using the control arrangement, the obtained outputs of the dynamic states of dark-bright soliton can be used to form the key suppression which can be available for communication security application, where finally, the key recovery can be obtained by controlling the add/drop filter outputs. The optical private tunnel system consists of data sending section, key learning section and peering section that use an add/drop filter which is used to generate the shape of tunnel from the optical keys, and a Mach-Zehnder interferometer is also used for multiplexing and de-multiplexing operations. The simulation results obtained have shown that the proposed system can be achieved, which can be used to form high security communication. © 2013 IEEE.
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    Optical bistability investigation in a nonlinear silicon microring circuit
    (2013-02-18)
    Chiangga, Surasak
    ;
    Pitakwongsaporn, Santhad
    ;
    Frank, Till D.
    ;
    Yupapin, Preecha P.
    We describe the optical bistability phenomenon in a silicon-on-insulator microring resonators device by using an analytical theory, which includes both linear and nonlinear effects such as two-photon absorption, Kerr effect, free carrier and thermo-optic effect (TOE). We show that the bistable switching threshold and the hysteresis loop width can be tuned by geometrical parameters of the device and by the nonlinear parameters. The accuracy of the analytical approach is verified by comparing the spectrum responds with the predicting data from a commercial finite-difference time-domain software tool, and a very close agreement is found between the two when TOE is incorporated in analytical theory. In addition, our analysis reveals that a new type of hysteresis loop occurs at low input intensity. The mode suppression of the designed device by Vernier effect for tunable filter applications is also briefly discussed. © 2012 IEEE.
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    Nonlinear switching in silicon-based ring resonators
    (2011-02-01)
    Kusalajeerung, Channarong
    ;
    Chiangga, Surasak
    ;
    Pitukwongsaporn, Santad
    ;
    Yupapin, Preecha P.
    In this paper, we analyzed and investigated the nonlinear switching characteristics of an optical device using a double-coupler silicon ring resonator in the presence of the linear losses, the Kerr nonlinearity, two-photon absorption, thermo-optic effects, free-carrier-induced absorption, and dispersion. Results obtained have shown that the general features of the nonlinear switching of the throughput and drop port signals are similar to a single-couple ring and nonlinear Fabry-Perot resonators, respectively. The interesting results of the double-coupler silicon ring resonator are the low switching power conditions and the linear amplification gain. The various applications can be provided by controlling the input-output of silicon-based resonators, for instance, by controlling the coupling ratio, free-carrier lifetime, and input wavelength, in which the multiple applications for optical switches, logic gates, and memories can be provided. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).
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    Entangled photon recovery state using a fiber ring resonator incorporating an erbium-doped fiber amplifier
    (2008-12-01)
    Suchat, Suebtarkul
    ;
    Khunnam, Wanchai
    ;
    Yupapin, Preecha P.
    We investigate a new system of photon-entangled recovery states using a fiber ring resonator incorporating an erbium-doped fiber (EDF). We also show that states of weak entangled photons can be regenerated and recovered after circulating in the amplified fiber optic medium. The output entangled photon states can be regenerated by adjusting the polarization controller of the amplified photons. Results obtained show that such a proposed system can be used to perform the polarization entangled recovery states, and the amplified output gain can be achieved. The amplifying noise is also detected and seen on the spectrum output, which affects the entangled photon output visibility. The change in the system temperature is also investigated, which shows that entangled state walk-off compensation is required to obtain the optimum entangled photon visibility. © 2008 Society of Photo-Optical Instrumentation Engineers.