Chaveamento solitônico no espelho óptico não linear em anel (NOLM) construído de fibra de dispersão decrescente (DDF)

Abstract

The performance of a standard nonlinear optical loop mirrar (NOLM) device and the NOLM constructed with a dispersion decreasing fiber (DDF) operating in the soliton and quasi-soliton regime is investigated numerically. Results showed that the soliton regime present best behavior when compared with the quasi-soliton regime. One concludes that operanting the NOLM in the soliton regime, the first, second and third transmission maxim could be obtained with lower power compared with the quasi-soliton regime. It was also observed that in the basic NOLM device, the output pulse duration is very dependent on the length ofthe fiber. ln the quasi-soliton regime, the transmitted pulses present strong shaping effects ( compression). However in the soliton regime, the transmitted pulses present fewer fluctuations in the time duration with pump power. The output pulse presents more stability with a larger time duration. Our simulation considering four different profiles, linear, hyperbolic, exponencial and Gaussian, conclude that, in average, the hyperbolic profile gives the lowest pump power for the first, second and third transmission peaks of transmission comparing with the other profiles. The gaussian profile presents the worse behavior. It was also observed that with a proper choice of the dispersion profile we could have a trasmitted pulse with no distortion in the soliton regime. For the quasi-soliton regime, strong compression was observed.