Pulse propagation in a decoupled two-core fiber

Abstract

It is known that a decoupled two-core fiber can prevent monochromatic light at a specific wavelength (the decoupling wavelength) launched into one core from coupling to the other core. In this paper, we show that a pulse at the decoupling wavelength launched into one core of such a fiber inevitably splits into two pairs of pulses propagating in the two cores along the fiber. The minimum distance required for pulse splitting to be visible is inversely proportional to the coupling-coefficient dispersion in the fiber and linearly proportional to the pulse width. It would take only several centimeters of a recently demonstrated decoupled two-core photonic-bandgap fiber to observe the pulse-splitting effect with a 100-fs pulse. We also study the effects of self-phase modulation on the pulse propagation dynamics in a decoupled two-core fiber in both the normal and anomalous dispersion regimes.

Modulation instabilities in two-core optical fibers

“…Recently, a photonic bandgap two-core fiber that gives C ¼ 0 has been demonstrated [35]. Nevertheless, such a decoupled twocore fiber can have an appreciable value of C 1 (around −1 ps=m), while maintaining C ¼ 0 [36].…”

Multi-Core Optical Fibers: Theory, Applications and Opportunities

“…Although in the picosecond regime MCF propagation models have been proposed in [56,57] including polarization effects and the random longitudinal fiber perturbations (but omitting the temporal fluctuations), in the femtosecond regime, existing MCF propagation models exclude polarization effects and omit both temporal and longitudinal random perturbations of the fiber [58][59][60]. In order to include these realistic fiber conditions in the mathematical description of the propagation of femtosecond optical pulses through a MCF, a theoretical model is proposed in [61] based on the concept of local modes.…”

“…In fact, MCFs can be employed to elucidate the underlying wave propagation phenomena of any physical system with propagating equations of the form of the CNLSEs, for example, superposed nonlinear waves in coherently coupled Bose-Einstein condensates [130] or turbocharge applications in acoustics [131]. Remarkably, in acoustics, the CLMT reported in [60] can play an essential role. Time-varying multi-core cylindrical acoustic ducts can be engineered with the same modal properties as optical MCFs.…”

Spatial, temporal, and spatio-temporal modulational instabilities in a planar dual-core waveguide

“…Recently, a photonic bandgap DWG that gives zero coupling has been demonstrated [26]. However, such a decoupled DWG will have an appreciable value of CCD, while maintaining the zero coupling term [27]. In Eq.…”