Abstract
In this paper, nonlinear porous silicon based all-optical modulator is proposed and investigated by utilizing an asymmetrical Mach–Zehnder Interferometer (MZI) configuration consisted of two couplers with equal splitting ratio, and two unbalance arms, in which a porous silicon (PS) waveguide as the nonlinear element is only placed in one arm of MZI, and another arm is short fiber delay line. Results show that both a pulsed pump and continuous probe wave are simultaneously launched into the input port with the result that an outcome signal with ~14.10dB modulation depth at probe wavelength is obtained at the end of the device under the conditions of an initial pulsed pump with 47.07dBm peak, 10.88 extinction ratio and 100ps duration, continuous probe wave of 0dBm power, and 3-mm long PS waveguide. Extinction ratio and eye opening ratio of eye diagram are observed for various operation speeds.
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