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Optik

Optical signal processing in nano nonlinear Fabry-Perot resonator containing negative index material

Elaheh Tahmasebi, Elham Yousefi, Mohsen Hatami, Amin Torabi Jahromi

Published Jun 7, 2018• 4 citations
Publisher
DOI
10.1016/j.ijleo.2018.06.022

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Applied Optics•May 20, 2002•0 citations
A new nonlinear fiber-based Fabry-Perot resonator (FFPR) is proposed for bistable optical devices in fiber optics, The device is constructed by embedding a metal-dielectric Fabry-Perot resonator containing a thermo-optic material into a single-mode fiber. The transmission and attenuation characteristics of the linear FFPR have been analyzed under Gaussian-beam approximation by the method of plane-wave expansion. The effects of the mirror separation, the thickness of the metal mirror, the coating number of the multilayer mirror, and the spacer index have been investigated numerically. Moreover optical bistability in the nonlinear FFPR has been investigated by the graphical solution. It has been found that the input-output characteristics of the proposed FFPR are strongly affected by the angular divergence of the beam in the spacer. Optical bistability has been demonstrated experimentally at the milliwatt-power levels by using a 1.3- mu m diode laser and single-mode fibers.>
In this paper we consider the nonlinear Fabry-Perot and its applications to optical signal and image processing. This paper addresses the signal processing aspects of a nonlinear Fabry-Perot interferometer with emphasis on image processing. The device geometry is shown in Figure 1. A thin nonlinear medium, whose refractive index is a function of the light intensity inside the Fabry-Perot is sandwiched between two plane parallel mirrors. The output as a function of input is shown in Fig. 2, for two different values of the difference between the Fabry-Perot low intensity resonance and the incident wavelength. The bistable curve in 2a is the origin of the term optical bistability and makes possible an optical memory, in which the output is a function of the history of the device. The Figure 2b represents a typical nonlinear transfer curve which may be used for signal processing. It can be seen that small changes in the input intensity Ic make large changes in the output intensity.
A Fabry-Perot resonator filled with second-order nonlinear optical material is investigated. Attention is devoted to making the resonator act as a nonlinear mirror for ultralow-intensity light signals that can be switched by a control beam at the second-harmonic frequency. The interaction process is an input-phase-independent parametric downconversion. The theoretical problem is solved through implementation of a dummy variable method optimized for a parametric process. Efficient amplification and bistability of low-intensity signals have been found.