Abstract

We present what we believe to be the first direct measurements of enhanced nonlinearities in large-mode-area fibers due to bend induced reductions in effective area. Both Raman scattering and self-phase modulation are observed to increase in tightly coiled fibers. The measured increase in nonlinearity compares well with predictions from simulations of the modal effective area.

© 2007 Optical Society of America

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References

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2006 (2)

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2001 (1)

A. Galvanauskas, IEEE J. Sel. Top. Quantum Electron. 7, 504 (2001).
[CrossRef]

2000 (1)

1998 (1)

1978 (1)

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Figures (4)

Fig. 1
Fig. 1

(a) Dependence of A eff on bend radius for fibers with 27 and 44 μ m core diameter. The stars indicate the experimental operating points. Mode profiles were calculated for the 44 μ m fiber for straight (b) and 9.5 cm (c) bend radii. The dotted lines indicate the fiber core.

Fig. 2
Fig. 2

(a) Experimental setup. (b) Spectrum of the output of the LMA test fiber showing the SPM broadened pulses at 1082 nm as well as the onset of Raman scattering at 1140 nm .

Fig. 3
Fig. 3

(a) Raman scattering in the 27 μ m core diameter for loose coiling compared to tight coiling. Peak Raman gain as a function of measured signal power for (b) the 27 μ m core diameter fiber and (c) the 44 μ m core fiber.

Fig. 4
Fig. 4

(a) SPM broadened spectrum for a loosely coiled fiber compared to a tightly coiled fiber. (b) Spectral broadening observed in 27 μ m core diameter fiber as a function of signal power for different R bend . (c) Spectral broadening in the 44 μ m core diameter fiber.

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