Physics – Optics
Scientific paper
2009-12-18
Physics
Optics
3 pages, 7 figures
Scientific paper
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.
Basu Mousumi
Ghosh Dipankar
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