Optical bistability and signal processing in a microstructured fiber ring resonator. Numerical CW laser sources. Feasibility of a MF-based nonlinear resonator.
We first introduce the model all-optical processing using this type of cavity is also inves- used in this work and investigate the response of the resonator tigated. In particular, we show that a ring cavity including a to CW light and broad pulses.
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The temporal behavior of the microstructured fiber should allow one to perform flip-flop resonator is analyzed for different parameters. Subsequently, and time-division demultiplexing functions. The analysis pre- using modulated CW light as the input signal, the performance sented here will be useful for future design of bistable mi- of an all-optical flip-flop are investigated.
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Finally, we explore crostructured fiber device. Da; Pc time-domain demultiplexing. The splice-loss regimes. These include bistability, period-doubling, or chaos between the MF and the pigtails of the coupler are assumed [1—3]. Bistability commonly refers to a state in which the out- to be 0. Fiber-based bistable devices offers wavelength located at around nm and a nonlinear coef- clear advantages over free-space resonators. A variable delay is introduced in the cav- properties of the fiber. Therefore, most of the stud- ies performed with standard fibers employed pulse-sources in order to attain the peak power required for the observation of bistable behavior.
On the other hand, the great flexibility in the design of microstructured fibers MFs results in unique optical properties compared to standard fibers . In partic- ular, the possibility of manufacturing large air-filling fraction structures allows for tuning the zero-dispersion wavelength between the visible and near-infrared region of the spectrum and considerably enhancing the strength of the nonlinearity while maintaining single-mode guidance. Note that we choose on purpose a The power transmitted at O1 and O2 can be, respectively, CW pump source as this considerably simplifies the experi- expressed as mental implementation of such a device.
In our It can be seen from Eqs. Also, the cavity detuning losses of 0.
This requires the linewidth of the input laser to be power transfer function Pout versus Pin of the device . These smaller than the width of the cavity resonance. As a conse- facts are illustrated in Fig. In the rameters, the linewidth of the input laser should not exceeds results presented in Fig. The made of standard fibers so that their effect on light propaga- transient response of the ring cavity governs the pulse shape tion can be neglected.
Another coupler is inserted into the setup after the MF. The losses experienced by the light propagat- ing inside the cavity are implemented according to Fig. After the second coupler an additional loss of 0. For this purpose, a standard split-step Fourier algorithm was utilized. The NSE includes the dispersion and dispersion slope of the fiber. The threshold for stimulated Raman scattering exceeds hundreds of Watts of intra-cavity power and effects of Raman scat- tering were, therefore, neglected. Though the dispersion was included, it was found to have a negligible effect on the sim- ulations as the pulse widths investigated are broad.
Optical bistability and signal processing in a microstructured fiber ring resonator at the cavity outputs for narrow pulses i. The input signal broader than the cavity-round trip time will experience the is sampled into elementary steps being propagated inside the steady-state response of the cavity. When the input field is cavity. After each round, the next elementary step is added in nearly in resonance with one of the cold cavity transmission the propagation.
To reconstruct the signal at the output of the peaks i. In this way, the of the input power at O1 see Fig. As the detuning pa- In all the simulations, we set the length of the MF to 1 m rameter increases, a clockwise counterclockwise hysteresis corresponding to a round-trip time of 0. As the width of cycle appears in the power characteristics at O1 and O2.
Sangin Kim, Email: rk. Soeun Kim, Email: rk. National Center for Biotechnology Information , U. Sci Rep. Published online Apr Author information Article notes Copyright and License information Disclaimer.
Corresponding author. Received Feb 4; Accepted Apr Abstract A majority of existing research on optical bistability rely on resonant schemes using nonlinear materials, which inevitably require a trade-off between the switching intensity and response time. Subject terms: Nonlinear optics, Integrated optics. Introduction Optical bistability is one of the key functionalities required to implement all-optical switching and optical memory that are essential functions for all-optical signal processing 1 — 3. Open in a separate window.
Figure 1. Optical bistability based on ENZ The proposed structure to realize optical bistability is schematically illustrated in the inset of Fig. Figure 2. Figure 3. Conclusions We numerically investigated the optical bistability behavior based on the ENZ mode in graphene. Author Contributions M. Notes Competing Interests The authors declare no competing interests. Contributor Information Sangin Kim, Email: rk.
References 1. Gibbs, H. Optical Bistability: Controlling Light with Light. Academic, Mazurenko DA, et al. Ultrafast optical switching in three-dimensional photonic crystals.
Resonator-free optical bistability based on epsilon-near-zero mode
Nihei H, Okamoto A. Switching time of optical memory devices composed of photonic crystals with an impurity three-level atom. Japanese J.