Optical crosstalk in a periodically inhomogeneous nonlinear dispersion directional fiber coupler

Silva, M.G. da; Bastos, A.M.; Sobrinho, C. S.; Lima, J.L.S.; Almeida, E.F. de; Sombra, A. S. B.

doi:10.1016/j.yofte.2004.09.005

Cited by 5 publications

(2 citation statements)

References 17 publications

(12 reference statements)

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“…In a nonlinear coupler constructed from a Kerr type medium, the dependence of the nonlinear refractive index n on the laser intensity is given by the expression n = n 0 + n 2 I [11], where n 0 is the refractive index at low intensity and n 2 is the Kerr nonlinear coefficient [4]. In particular, the analysis of soliton propagation in nonlinear inhomogeneous waveguides is an important topic with big possibilities of applications [9] [10]. The study of the propagation of fundamental solitons in a waveguide with a periodically modulated nonlinearity coefficient is a current topic of interest for optical communication systems [5].…”

Section: Introductionmentioning

confidence: 99%

“…Usually, the Xtalk of a switch is defined as the worst-case crosstalk over all outputs and interconnection patterns. The Xtalk level has always been the focus of many investigations because of its importance in device applications and the difficulty of achieving a good level [8] [9]. In addition to the Xtalk level, the other important parameter used to characterize the suitability of a switch for optical networking applications is the extinction ratio (Xratio).…”

Section: Introductionmentioning

confidence: 99%

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Periodic Modulation of Nonlinearity in a Two-Core Photonic Crystal Fiber: A Numerical Investigation

Filho¹,

Mendes²,

Sousa³

et al. 2015

JEMAA

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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.

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