Equilibrium mode distribution

About: Equilibrium mode distribution is a research topic. Over the lifetime, 928 publications have been published within this topic receiving 14939 citations.

Field distribution and mode interaction in twin-core fiber

Abstract: A new direct method for the measurement of the longitudinal power distribution in multicore fibers using the luminescence of active ions is proposed. The method is employed in the study of the effect of curvature of twin-core fiber on the interaction of modes that propagate in different cores. The experimental distributions are in qualitative agreement with the model of mode interaction in curved fiber with allowance for the photoelastic effect. The results are used to determine the length of the mode interaction and the difference of the core refractive indices.

Mode properties of a coaxial multi‐layer hybrid surface plasmon waveguide

Abstract: A novel type of coaxial circular multi-layer hybrid surface plasmonic waveguide is proposed and of which the mode properties are analyzed theoretically at the telecommunication wavelength of 1550 nm. Simulation results show that by tuning the size of the waveguide, the mode propagation properties could be effectively controlled to obtain enhanced mode confinement as well as weaker propagating loss. It is also found that the mode can be strongly localized in the middle low-index dielectric media layer with sub- or deep sub-wavelength scale. Further investigation proves that the mode propagation loss can be well compensated by replacing the high-index dielectric media with gain material to obtain longer propagation length with very tight mode confinement. The proposed hybrid structure can be used in nanophotonic waveguides, high-quality nanolasers, optical trapping, and biosensors.

Analysis on the Gaussian approximation of LP01 mode

Abstract: A new method that the equivalent mode field radius can be acquired according to the equivalent matching efficiency method is presented and the equation of the equivalent mode field radius, which is based on the core layer radius, the normalized standing wave parameter and the normalized evanescent wave parameter, is given. Moreover, adopted computer numerical simulation, a mathematical modeling between the equivalent mode field radius and the normalized frequency of fiber is established. Based on this, the equation between the equivalent mode field radius and the normalized frequency is introduced by curve fitting method. The numerical calculation indicates that it has a higher precision. As for weakly guiding optical fiber, referred to the characteristic of the beam propagation factor of diffractive beam of LP 01 mode from its end surface, it was illuminated that the Gaussian approximation for the mode field distribution of LP 01 mode is rational. The characteristic of the field of the Gaussian approximation, which is based on the equivalent mode field radius, is analyzed. The difference between the eigen mode field of LP 01 mode and the field of its Gaussian approximation is discussed. From that, we can draw the conclusion that it is relatively accurate to adopt the equivalent matching efficiency method to obtain the equivalent mode field radius.

Stabilized Large Mode Area in Tapered Photonic Crystal Fiber for Stable Coupling

Abstract: A rigorous modal solution approach based on the numerically efficient finite element method (FEM) has been used to design a tapered photonic crystal fiber with a large mode area that could be efficiently coupled to an optical fiber. Here, for the first time, we report that the expanded mode area can be stabilized against possible fabrication tolerances by introducing a secondary surrounding waveguide with larger air holes in the outer ring. A full-vectorial -field approach is employed to obtain mode field areas along the tapered section, and the Least Squares Boundary Residual (LSBR) method is used to obtain the coupling coefficients to a butt-coupled fiber.