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Author: search.filters.author.Chiangga, SurasakSubject: search.filters.subject.ring resonator

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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).