TITLE:
Periodic Modulation of Nonlinearity in a Two-Core Photonic Crystal Fiber: A Numerical Investigation
AUTHORS:
A. F. G. F. Filho, A. G. L. S. O. Mendes, J. R. R. Sousa, G. S. Batista, A. M. Bastos, C. S. Sobrinho, M. L. Lyra, A. S. B. Sombra
KEYWORDS:
Coupler of Photonic Crystal Fibers, Periodically Modulated the Non-Linearity, Two-Core Nonlinear, Crosstalk Level, Extinction Ratio Level
JOURNAL NAME:
Journal of Electromagnetic Analysis and Applications,
Vol.7 No.2,
February
26,
2015
ABSTRACT: We
present a numerical investigation of the propagation and the switching of
ultra-short pulses (100 fs) in a two-core nonlinear coupler of photonic crystal
fibers constructed with periodically modulated the non-linearity fiber
(PMNL-PFC). Our simulations are taking into account different amplitude and
frequency modulations of the PMNL-PFC. A coupler for coupling whose length is Lc = 1.8 cm, the transmission
characteristics, the compression factor, the crosstalk (Xtalk) and extinction
ratio (Xratio) levels of the first order solitons were studied for low to high
pump energies considering 2Lc.
By an analysis on the reference channel (channel 2), it is observed that at low
modulation frequencies an increase occurs in the switching power increasing
transmission efficiency. For high modulation frequencies, the transmitted
energy efficiency loses. The switching pulses are stronger for low frequency
and high amplitude modulation. The Xtalk is a function of the measurement made on
the secondary channel (channel 1). It was observed that this unwanted
high-frequency energy increases to lessen the measure of the amplitude
modulation. In summary, we have demonstrated that introduction of a
non-linearity profile takes the periodically modulated PMNL-PFC to strong
variations at transmission efficiency, Xtalk, Xratio a function of frequency
and modulation amplitude and the input power.