Аннотация
The performance of a standard nonlinear optical loop mirror (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
operating the NOLM in the soliton regime, the first, second and third
transmission maxim could be obtained with low pump 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 length of the
fiber. In the quasi-soliton regime, the transmitted pulse 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 duration present more stability with a bigger time duration (C = 0.6), Our simulations considering four
different profiles, linear, hyperbolic, exponential and Gaussian
conclude that, on average, the hyperbolic profile gives the lowest pump
power for the first, second and third transmission peaks of transmission
compared 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 transmitted pulse with no distortion
in the soliton regime. For the quasi-soliton regime, strong compression
was observed. (C) 1999 Elsevier Science B.V. All rights reserved.
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