Nonlinear polarization rotation in semiconductor optical amplifiers: theory and application to all-optical flip-flop memories

Abstract

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Three-state all-optical memory based on coupled ring lasers

“…A two-state alloptical memory can be realized from two-coupled nonlinear optical elements. Examples are an all-optical memory that is made from two-coupled lasers [3], an all-optical memory that is made from two-coupled nonlinear polarization switches [4], [5], and an all-optical memory that is realized out of two-coupled Mach-Zehnder interferometers [6]. In this letter, we demonstrate that it is possible to construct a three-state optical memory based on three coupled identical ring lasers.…”

Alternative Approach of Developing Optical Binary Adder Using Reversible Peres Gates

“…PSW works on the principle of nonlinear polarization rotation of the Semiconductor Optical Amplifier (SOA). So many researchers have already explained the nonlinear polarization rotation characteristic of SOA in different ways [11][12][13], but in this article the basic theory of nonlinear polarization rotation is explained with the help of simple rateequation model as stated by Dorren et al [14].…”

All-optical flip-flop based on coupled SOA-PSW

“…The implementation of the flip-flop [3] in this paper is based on semiconductor optical amplifiers (SOAs). The nonlinear effects of SOA can be summarized into the following four forms: cross-gain modulation (XGM) [3], cross-phase modulation (XPM), four-wave mixing (FWM), and nonlinear polarization rotation [1,4] (NPR) effects. Compared with several other nonlinear effects, NPR effect can consider the SOA's polarization state of polarized sensitive effectively.…”