Abstract

Leakage channel fibers, designed to suppress higher-order modes, demonstrate resonant power loss at certain critical radii of curvature. Outside the resonance, the power recovers to the levels offset by the usual mechanism of bend-induced loss. Using C2 imaging, we experimentally characterize this anomaly and identify the corresponding physical mechanism as the radiative decay of the fundamental mode mediated by the resonant coupling to a cladding mode.

© 2012 Optical Society of America

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References

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2007

J. D. Love and C. Durniak, IEEE Photon. Technol. Lett. 19, 1257 (2007).
[CrossRef]

2006

2005

2004

1997

1992

H. Renner, J. Lightwave Technol. 10, 544 (1992).
[CrossRef]

1989

J. D. Love, Proc. IEE Part J 13, 225 (1989).
[CrossRef]

1978

Y. Murakami and H. Tsuchiya, IEEE J. Quantum Electron. 14, 495 (1978).
[CrossRef]

1976

Albertsen, M.

Barankov, R. A.

Bhadra, S. K.

Birks, T. A.

Bjarklev, A.

Bonacinni, D.

Dong, L.

Durniak, C.

J. D. Love and C. Durniak, IEEE Photon. Technol. Lett. 19, 1257 (2007).
[CrossRef]

Fermann, M. E.

Folkenberg, J. R.

Fu, L.

Ghosh, D.

Knight, J. C.

Koshiba, M.

Li, J.

Love, J. D.

J. D. Love and C. Durniak, IEEE Photon. Technol. Lett. 19, 1257 (2007).
[CrossRef]

J. D. Love, Proc. IEE Part J 13, 225 (1989).
[CrossRef]

Marcinkevicius, A.

Marcuse, D.

Mckay, H. A.

McLaughlin, J.

Mortensen, N. A.

Murakami, Y.

Y. Murakami and H. Tsuchiya, IEEE J. Quantum Electron. 14, 495 (1978).
[CrossRef]

Nielsen, M. D.

Pal, M.

Paul, M. C.

Peng, X.

Ramachandran, S.

Renner, H.

H. Renner, J. Lightwave Technol. 10, 544 (1992).
[CrossRef]

Rosa, L.

Russell, P. S.

Saitoh, K.

Sasaki, K.

Schimpf, D. N.

Thomas, B. K.

Tsuchiya, H.

Y. Murakami and H. Tsuchiya, IEEE J. Quantum Electron. 14, 495 (1978).
[CrossRef]

Varshney, S.

Wong, W.

Yao, L.

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Figures (4)

Fig. 1.
Fig. 1.

Output power as a function of coiling diameter. Insets (a)–(c) Output mode profiles at different coiling diameters. (d) Cross section of the LCF. (e) Schematic representation of the different power loss mechanisms possible in bent LCFs: dashed lines indicate effective indices, and wiggly lines denote radiative loss due to tunneling.

Fig. 2.
Fig. 2.

C2 imaging setup: SLD, superluminescent diode; LP, linear polarizer; HWP, half-wave plate; BS, beam splitter; BC, beam combiner. Inset (a) cross section of the LCF.

Fig. 3.
Fig. 3.

Relative modal power as a function of group delay at the resonance (Rc=11cm). Insets (a)–(c) output image and the images of reconstructed modes.

Fig. 4.
Fig. 4.

Relative modal power of LP01 and LP11 (peak values) as a function of the relative group delay, for different coiling diameters. Inset, schematic representation of bend-induced coupling of the FM and cladding mode as a mechanism of power loss.

Equations (1)

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P(r,τ)=mpmGmr2(ττmr)Im(r).

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