Mode coupling and equilibrium mode distribution conditions in plastic optical fibers

Equilibrium Mode Distribution and Steady State Distribution in Step-Index Glass Optical Fibers

“…2). In summary, our numerical results show a much longer coupling length (L c = 1800 m) in SI GOF than in SI POFs (typically L c ∼ = 15 to 35 m [13,14]). Similarly, the length for achieving the SSD is also much longer in the SI GOF (z s = 3100 m) than in SI POFs (usually up to one hundred meters).…”

“…• and ∆z = 0.0005 m in order to achieve stability of our finite difference scheme [8,14]. One can observe from radiation patterns in the fiber of shorter length z = 700 m in Fig.…”

Calculation of the Impulse Response of Step-Index Plastic Optical Fibers Using the Time-Dependent Power Flow Equation

“…The value of the constant coupling coefficient D = 1.171 × 10 −4 rad 2 /m has been used in the first approach to the modeling of mode coupling in the analyzed fiber by Mateo et al [6], which we have adopted in this work. One should mention here that modeling the mode coupling process with a constant D is commonly done by many other authors [1,4,7,8]. A Dirac impulse in time and a mode distribution with the width at 1/e of Θ 0 = Θ ∞ = 9.85…”

Comparison of Methods for Calculating Coupling Length in Step-Index Optical Fibers

“…It thus progressively alters the input power distribution along the fiber length. Consequently, it has been described as strongly affecting transmission characteristics of the fiber [1][2][3][4][5]. Mode coupling is caused by fiber impurities and inhomogeneities introduced during the fiber manufacturing process.…”

“…To experimentally determine the fiber length L c where the EMD is achieved, pulse broadening measurements can be performed for different fiber lengths z while trying to identify the length z = L c beyond which the band width becomes proportional to 1/z 1/2 instead of 1/z [2,7]. An alternative method of determining L c is to identify the fiber length after which all output angular power distributions take the disk form regardless of the incidence angle (within the numerical aperture (NA) of the fiber).…”