Effect of Bend Loss on Parabolic Pulse Formation by Active Dispersion Tailored Fibers

TL;DR

This paper investigates how bend loss affects the formation of parabolic self-similar pulses in active dispersion-tailored fibers with spatially varying core radii, providing insights for fiber fabrication.

Contribution

It introduces a model accounting for bend loss variation in NDDFs with changing core radii, analyzing its impact on pulse formation and guiding fiber design.

Findings

Bend loss varies along the fiber due to core radius changes.

Suitable index differences and bend radii enable similariton formation.

Bending increases the required fiber length for pulse formation.

Abstract

This work reports the performances of straight and bent active normal dispersion decreasing fibers (NDDF), with spatial nonlinear variation, to form parabolic self-similar pulses. The core radius changes along the NDDF length, thereby altering the transverse field distribution lengthwise. Hence bend loss is no longer a constant quantity. Including this loss variation, we investigate the performances of NDDFs as generators of parabolic self-similar pulses. In view of the small changes of relative refractive index differences during production, we obtain several NDDFs with variations of core radii. Suitable choice of index differences and bend radius of curvature of the fibers leads to obtain similaritons. Even for sufficiently small index differences and bend radii, parabolic pulses are formed at the cost of higher optimum length in comparison to straight fibers. The comparative study on the straight and bent NDDFs with different index difference values is helpful for fiber optic manufacturers to fabricate the proposed NDDFs.