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Shift of zero-dispersion wavelength in bent optical fibers
Author(s) -
Andrés Gil-Molina,
A. Perez-Ramirez,
Jhonattan C. Ramírez,
Lucas H. Gabrielli,
H.L. Fragnito
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.006700
Subject(s) - optics , dispersion (optics) , materials science , zero dispersion wavelength , wavelength , bend radius , optical fiber , radius , laser , dispersion shifted fiber , fiber laser , bending , physics , fiber optic sensor , computer security , computer science , composite material
The understanding of how bending modifies the dispersion of optical fibers, in particular, the zero-dispersion wavelength (λ 0 ), is essential in the development of compact nonlinear optical devices such as parametric amplifiers, wavelength converters, soliton lasers and frequency comb generators. Typically, substantial variations in the parametric gain and/or conversion efficiency are significant for changes in λ 0 of ~0.1 nm, which occur for variations on the bending radius (Rb) of 1 cm or less. Measuring λ 0 as a function of bending radius (Rb) is challenging, as it requires detecting changes < 0.1 nm and in short fibers. By using a method based on four-wave mixing (FWM) generated by an incoherent-pump with relatively broad spectrum and a weak laser, we report measurements of λ 0 as a function of Rb in a dispersion-shifted fiber with <0.1 nm accuracy on λ 0 . This method is sensitive enough to measure small variations in λ 0 of ~0.04 nm in very short fibers (~20 m). We observe that λ 0 increases by 12 nm when Rb is decreased from 10 cm to 1 cm, and a change of 1 nm is obtained for Rb = 3 cm. We also present numerical simulations of the bent fiber that are in good agreement with our measurements, and help us to explain the observations and to predict how high-order dispersion is modified with bending. This study can provide insights for dispersion engineering, in which bending could be used as a tuning, equalization, or tailoring mechanism for λ 0 , which can be used in the development of compact nonlinear optical devices based on fibers or other bent-waveguide structures.

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