Soliton switching and multi-frequency generation in a nonlinear photonic crystal fiber coupler

Abstract

Soliton switching in nonlinear directional couplers implemented in photonic crystal fibers (PCF) examined here. A vector finite element method (FEM) has been developed to precisely calculate the dispersion along with coupling length of the guided modes. The PCF coupler geometry was carefully designed so that it can support soliton pulses. Soliton switching is demonstrated numerically at 1.55 microm for 100 femto-second (fs) pulses. Our theoretical results explain some of the key spectral features previously observed in the experiment.

All-optical XOR and OR by Mach-Zehnder Interferometer engineered photonic crystal fibers

“…The corresponding parameters for Eqs. (2.2) and (2.3) are b 2 = À47 ps 2 /km À1 , b 3 = 0.1 ps 3 /km, c = 3.2 Â 10 À3 (wm) À1 (for an effective area A eff = 41 mm 2 ) and c/x = 2.6 Â 10 À18 s/(wm) [30,31]. In our investigation, the input pulses are in the fundamental soliton propagation regime.…”

Tunable All Optical Switch Implemented in a Liquid Crystal Filled Dual-Core Photonic Crystal Fiber

“…Vector finite element method (FEM) was used to analyze the LC-PCF modes [12][13][14]19]. The vector wave equation for the E field is given by,…”

“…The third and fourth terms in Eq. (7) correspond to the dispersion, the fifth term corresponds to self and cross phase modulation, the sixth term describes the shock effect and the last term corresponds to the linear coupling [12,13,25]. These equations were solved numerically using a split step Fourier (SSF) method for 200 fs pulses.…”

“…Waves are guided in this PCF by total internal reflection (TIR) due to the refractive index difference between soft glass and LC. Modal characteristics of regular dual core PCFs with air filled cladding holes were investigated by using the vector finite element method (FEM) [11][12][13]. In this study, we used the similar numerical tools to evaluate wavelength dependent dispersion and coupling characteristics of LC-PCF couplers.…”

Investigation of all optical pulse steering through a highly nonlinear chalcogenide twin core photonic crystal fiber

“…[2]. Photonic crystal fiber cou plers (PCFC) made of highly nonlinear glasses are of current trend to manufacture the all optical devices for high data rate optical communication systems with very low threshold power [3], [4], [5]. Out of variety of choices, the chalcogenide glasses with high IR transparency possessing twice the magnitude of third order nonlinearity as that of silica are the best candidates available to realize such devices [7], [8], [9].…”