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Dynamic modeling of cylindrical waveguide based optical attenuator

This paper presents a mathematical model to predict the dynamic behavior of a MEMS based variable optical attenuator (VOA) and compares with ANSYS simulation values. The optical attenuation is achieved by the electrostatic actuation of a metal coated cylindrical waveguide. The waveguides are suitable for micromachined configurations. Electrostatic modeling employed in this analysis also takes into consideration the cylindrical geometry of the waveguide. The modeling utilizes Rayleigh-Ritz energy method in evaluating the fundamental and the higher natural frequencies of the system. The predicted natural frequencies of the optical system have been compared with ANSYS simulations to validate the proposed model. The variation of the dynamic performance of the system with respect to the critical design parameters, such as, applied voltage, electrode gap and length of the actuator is also presented. The results clearly indicate the applicability of the proposed method to optical attenuation.