Abstract

We present a study of the large numerical aperture and high capture efficiency in a class of microstructured optical fibers, also called �??air-clad�?? fibers. We employ a recently developed method where the leaky modes supported by a waveguide are used to determine the far-field angular intensity distributions. These distributions are subsequently used to calculate the capture efficiency and numerical aperture. Their dependence on length, wavelength, bridge thickness and number of layers is presented. Based on the physical insights provided by the analysis, two simplified heuristic models are presented which are valid for either single layer or multiple layer fibers. They show good agreement with the full numerical calculations

© 2004 Optical Society of America

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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App. Phys. Lett.

G. Bouwmans, R.M. Percival, W.J. Wadsworth, J.C. Knight and P.St.J. Russell, ???High-power Er:Yb fiber laser with very high numerical aperture pump-cladding waveguide,??? App. Phys. Lett. 83 817-818 (2003).
[CrossRef]

Electron. Lett.

J.K. Sahu, C.C. Renaud, K. Furusawa, R. Selvas, J.A. Alvarez-Chavez, D.J. Richardson and J. Nilsson, ???Jacketed air-clad cladding pumped Ytterbium-doped fiber laser with wide tuning range,??? Electron. Lett. 37 1116-1117 (2001).
[CrossRef]

IEEE. Phot. Tech. Lett.

W.J. Wadsworth, R.M. Percival, G. Bouwmans, J.C. Knight, T.A. Birks, T.D. Hedley and P.St.J. Russell, ???Very high numerical aperture fibers,??? IEEE. Phot. Tech. Lett. 16 843-5 (2004).
[CrossRef]

J. Lightwave Tech.

N.A. Issa and L. Poladian, ???Vector wave expansion method for leaky modes of microstructured optical fibres,??? J. Lightwave Tech. 21 1005-12 (2003).
[CrossRef]

J. Opt. A

C.P. Achenbach and J.H. Cobb, ???Computational studies of light acceptance and propagation in straight and curved multimode active fibers,??? J. Opt. A 5 239-249 (2003).

J. Opt. Soc. Am

R.J. Potter, ???Transmission properties of Optical Fibers,??? J. Opt. Soc. Am. 51 1079-89 (1961).

Opt. Express

Solar Energy

D. Feuermann, J.M. Gordon and M. Huleihil, ???Light leakage in optical fibers: Experimental results, modeling and the consequences for solar collectors,??? Solar Energy 72, 195-204 (2002).
[CrossRef]

Other

N.A. Issa, ???High numerical aperture in multimode microstructured optical fibers,??? submitted to Applied Optics. Temporarily available at <a href= "http://www.oftc.usyd.edu.au/docs/ext/HighNAinMultimodeMOFs.pdf">http://www.oftc.usyd.edu.au/docs/ext/HighNAinMultimodeMOFs.pdf</a>

K. Sakoda, ???Optical properties of photonic crystals,??? (Springer, Berlin, Germany, 2001), pp. 21-23.

A.W. Snyder, J.D. Love, Optical waveguide theory, (Chapman and Hall, New York, 1983), Chapters 4, 12 and 20.

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