Elsevier

Optics Communications

Volume 280, Issue 2, 15 December 2007, Pages 343-350
Optics Communications

Chaotic signal generation and cancellation using a micro ring resonator incorporating an optical add/drop multiplexer

https://doi.org/10.1016/j.optcom.2007.08.018Get rights and content

Abstract

We propose a new design of a chaotic signal generation and cancellation system using an all fiber optic scheme. A system consists of a standard diode laser, a fiber optic micro ring resonator, and an optical add/drop multiplexer. When light from the diode laser is input into the fiber ring resonator, the chaotic signal can be generated by using the selected fiber ring resonator parameters and the diode laser input power. The required signal is obtained in the transmission link via the add/drop device by a specific user at the drop port. Simulation results obtained have shown the potential of application, especially, when the practical ring radius is 10 μm with the optical input power is in the range of the communication standard diode laser, for instance, when the coupling coefficients of the add/drop device are κ1 = 0.01 and κ2 = 0.01–0.9. When the add port of the add/drop device is employed, such a system can also be utilized for the multi user applications.

Introduction

Nonlinear behaviors of light traveling in a fiber optic ring resonator are commonly induced by the effects such as Kerr effects [1], four-wave mixing [2], and the external nonlinear pumping power [3]. Such nonlinear behaviors are named as chaos, bistability, and bifurcation [4]. More details of such behaviors in a micro ring resonator are clearly described by Yupapin et al. [5]. However, apart from the penalties of the nonlinear behaviors of light traveling in the fiber ring resonator, there are some benefits that can be used in the communication system. One of them known as chaotic behavior that has been used to make the benefit in communication system in either electronic or optical communications [6], [7]. Unfortunately, most of the previous investigations are shown in mathematical ways, where the practical applications could not be implemented. For instance, the chaotic control input power into the system is higher than the standard communication light source used in the system, and the implemented fiber optic devices are not in the fabrication scales. This means the ability of chaotic carriers to synchronize in a communication system is not valid. Recently, Ikeda et al. [8] have reported the successful fabrication of the micro ring resonator with a radius of 10 μm using the optical materials called GaAs–AlGaAs, which are suitable for use in the practical devices and systems. Yupapin and Saeung [9] have also shown that an add/drop device could be constructed using a micro ring resonator, where the device characteristics have shown that they are suitable to implement in the practical communication system. In practical applications, the micro ring resonator and add/drop device parameters are required to make them within the ranges of the usual fabrication parameters. This paper presents the design of the system of chaotic signal generation and cancellation that uses the practical device parameters. Such a system can be used to secure the information signals, where the tapping of the signals from the optical communication link is extremely difficult. Results obtained have shown that the simulation results with the device parameters used have good potentials for practical applications. In this work, for example, the selected parameters n0 is the waveguide refractive index [2], the waveguide nonlinear refractive index (n2), the coupling coefficient of single ring resonator (κ), the coupling coefficient of add/drop (κ1, κ2) are 1.54, 1.4 × 10−13, κ = 0.0225, and κ1 = κ2 = 0.01, respectively. The fractional coupling intensity loss is γ = 0.01, and the micro ring radii is R1 = R2 = 10 μm. The analogy of the chaotic signal generation using fiber ring resonator and the related behaviors are described. The chaotic noise cancellation via the add/drop device with the selected coupling coefficients and the application of the system for multi users are also discussed.

Section snippets

Chaotic signal generation and cancellation

Consider an add/drop ring resonator configuration as depicted in Fig. 1, which is constructed by a single ring resonator and a 2 × 2 optical coupler [10], the circumference of the fiber ring is L. For convenience of an analysis, we assume that the complex electric field at each port as shown in Fig. 1 is given by E(t). It is the incoming light field of an input port, the transmitted light field to the output port is Eout(t). While the rest of the fields E1(t) and E2(t) are the circulated fields

Simulation results

In this section, the proposed system characteristics are investigated with some given parameters associating the practical applications. The simulation results of light signals traveling through the system are plotted and discussed in detail. Firstly, we investigate the chaotic control behaviors, the control chaotic input powers are within the range 1 and 5 mW. κ is fixed at 0.0225, κ1 and κ2 are within the same range, i.e., between 0.01 and 0.9 as shown in Fig. 2. The chaotic signals after

Discussion and conclusion

Results obtained have shown that the chaotic noise can be generated or multiplexed with the signal in the transmission system. The required signals can be recovered or retrieved by the add/drop device, where the coupling power at the drop port is the condition to make the signal recovery. For example, when the input signal (in Fig. 3) has the input wavelength λ1 into the ring resonator system, then the chaotic signal is generated and launched into the fiber optic link. The drop port is

Acknowledgement

One of the authors (W. Suwancharoen) would like to acknowledge the Rajamangala University of Technology, North East Campus, Thailand, in giving him a scholarship for higher education at King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand.

References (14)

  • H. Li et al.

    Opt. Commun.

    (1998)
  • P.P. Yupapin et al.

    Opt. Commun.

    (2007)
  • F. Sanchez

    Opt. Commun.

    (1997)
  • P.P. Yupapin et al.

    J. Nonlinear Opt. Phys. Mater.

    (2007)
  • V. Van et al.

    IEEE J. Quantum Electron.

    (2002)
  • R. Wang et al.

    IEEE J. Quantum Electron.

    (2001)
  • P.P. Yupapin, Intern. J. Light Electron. Opt., in press,...
There are more references available in the full text version of this article.

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