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Author: search.filters.author.Yupapin, Preecha P.Subject: search.filters.subject.optical bistability

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    Graphical approach for nonlinear optical switching by PANDA vernier filter
    (2013-07-29)
    Bahadoran, Mahdi
    ;
    Ali, Jalil
    ;
    Yupapin, Preecha P.
    Nonlinear response of light such as bistability, the Ikeda instability and the dynamics of light within InGaAsP-InP-modified add-drop resonator (PANDA Vernier resonator) is studied. The signal flow graph method is used to obtain the optical transfer function. Invariant and symmetric coupling coefficients R=k<inf>L</inf>=0.25 for indirect couplers are applied and the effect of changing symmetric direct couplers (K<inf>1</inf>=K<inf>2</inf>) for two different resonant mode numbers is studied. The minimum drop port switching time of 2.83 ps and 2.87 ps for resonant mode numbers of 7;5;5 and 4;3;3 are achieved, respectively. The simulated results introduce the PANDA Vernier system as a proper optical device for future optical communication and signal processing systems. © 1989-2012 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).