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Author: search.filters.author.Koosirivanichakorn, P.

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    The prediction of the maximum FSR and minimum HPBW for the silicon based ring and racetrack microresonators
    (2005-12-01)
    Somkuarnpanit, S.
    ;
    Koosirivanichakorn, P.
    ;
    Khuntaweetep, S.
    This paper determines the maximum free spectral range (FSR) and the minimum half power bandwidth (HPBW) of the ring and racetrack resonators based on silicon substrate using FDTD. At the optimum cross-section that provides the compromised efficiency, the relationships between HPB W against the coupling efficiency and FSR, against the racetrack round trip have been obtained. The relationships would be utilized to determine the possibly maximum FSR of 60nm and the minimum HPBW of 5nm, or highest quality factor for the ring microresonator with 1μm radius. © 2005 IEEE.
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    A design of silicon-based racetrack microcavity resonator using FDTD
    (2002-12-01)
    Somkuarnpanit, S.
    ;
    Puangkird, B.
    ;
    Koosirivanichakorn, P.
    This paper proposes a design of the racetrack microcavity resonator based on silicon substrate. The optimized dimensions of the structure were found by FDTD simulation. The characteristics were also found by the method, and further compared with another model of mode coupling theory. The optimized dimensions of straight guide at wavelength 1.55 μm are thickness and width of 0.4 μm. The curve guide provides the maximum at 1μm whereas the resonating section requires small coupling section of about 3 μm.
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    Design of a silicon based race track microcavity resonator using finite-difference time-domain method
    (2002-01-01)
    Somkuarnpanit, S.
    ;
    Koosirivanichakorn, P.
    ;
    Khuntaweetep, S.
    This paper presents an algorithm for use in designing a racetrack microresonator on silicon substrate, whose structure is illustrated in Figure 1. The accurate numerical FDTD has been used to calculate the characteristics of the device in the range of optical communication wavelengths. The optimum size of the guide, as well as the curvature of the curved guide, is considered from the results. From the optimum size of the device, the spectral response is consequently calculated, which leads to two important relationships between half-power bandwidth, HPBW, against the coupling efficiency, K, and free spatial range, FSR, against the racetrack round trip, X<inf>rt</inf> as illustrated in Figure 3 and Figure 4, respectively. Having used these parameters of L and R, in conjunction with the optimum size of the guide, in FDTD simulation, the transfer characteristics can be obtained as following: X<inf>n</inf> = 17.94um, K = 0.223, FSR = 29.45 nm, HPBW= 4.45nm, Q = 346.07 and finesse of 6.62, which are close to the design values. Therefore, our design procedure could be used in design of the dimensions of racetrack microresonators on silicon substrates in the communication wavelengths.