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Applied Physics Letters

Transient analysis of a nonlinear fiber ring resonator

Francisco Javier Fraile-Pelaez, Miguel Prol, David J. Santos, Jose M. Soto-Crespo

Published Sep 13, 1993• 12 citations
Publisher

Abstract

In this letter we study the transient behavior of a nonlinear fiber ring resonator operating both as an optical bistable and as a differential amplifier. The speed of response of the structure is investigated, and some general considerations on the performance of these kinds of devices are presented.
DOI
10.1063/1.109661

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In this paper, the transient response of a double coupler fiber ring resonator containing an erbium-doped fiber amplifier (EDFA) in half part of the fiber ring resonator and a quantum dot-doped fiber (QDF) saturable absorber in the other half, is investigated. It is demonstrated that, depending on the device parameters and the input power of the signal and pump, various types of dynamic behaviors (such as bistability, monostability, and regenerative pulsation) can be observed in this intrinsic, optical bistable device. The proposed device can be exploited by optical communication networks to realize all-optical functionalities.
We present a method for calculating the dynamic input–output characteristics of a nonlinear fiber ring resonator caused by a change in input intensity. It is based on an original method developed by Bischofberger and Shen [Phys. Rev. A 19, 1169 (1979)] to study a transient nonlinear Fabry–Perot resonator. We treat a double-coupler fiber ring resonator, in which two types of optical bistability (transmission bistability and reflection bistability) are available and present the illustrative numerical results for a few cavity parameters. This analysis will be useful for a future experimental verification of optical bistability in fiber ring resonators and for the design of fiber bistable devices.
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A novel optical inverted bistable switch based on a nonlinear fiber ring resonator (FRR) containing a semiconductor optical amplifier (SOA) has been analyzed and experimentally demonstrated. Optical bistability is obtained due to the transmission characteristics of the resonator and the SOA's gain characteristics. A complete theoretical analysis and supporting simulations are presented. A prototype is demonstrated using commercial optical components. Experimental results show switching performance with falling times lower than 10 ns.
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