Abstract

We report what is believed to be the first example of structural long-period gratings written in pure silica photonic crystal fibers (PCFs). The gratings are realized by periodic collapse of the holes of the PCF by heat treatment with a CO2 laser. The resulting periodic hole-size perturbation produces core-to-cladding-mode conversion. These results can lead to a new family of structural all-fiber devices that use the unique properties of PCFs.

© 2002 Optical Society of America

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References

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2001

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1997

1996

Atkin, D. M.

Bennion, I.

Y. Liu, J. A. R. Williams, L. Zhang, and I. Bennion, Opt. Commun. 164, 27 (1999).
[CrossRef]

Birks, T. A.

Diez, A.

Dimmick, T. E.

Eggleton, B. J.

Erdogan, T.

Hwang, I. K.

James, S. W.

Kakarantzas, G.

Khaliq, S.

Kim, B. Y.

Knight, J. C.

Le Roux, R.

Liu, Y.

Y. Liu, J. A. R. Williams, L. Zhang, and I. Bennion, Opt. Commun. 164, 27 (1999).
[CrossRef]

Mangan, B. J.

Reeves, W. H.

Russell, P. St. J.

Spälter, S.

Stegall, D. B.

Strasser, T. A.

Tatam, R. P.

Westbrook, P. S.

Williams, J. A. R.

Y. Liu, J. A. R. Williams, L. Zhang, and I. Bennion, Opt. Commun. 164, 27 (1999).
[CrossRef]

Windeler, R. S.

Yun, S. H.

Zhang, L.

Y. Liu, J. A. R. Williams, L. Zhang, and I. Bennion, Opt. Commun. 164, 27 (1999).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Scanning electron micrograph of the cleaved end of the fiber. The hole diameter is 0.5 µm, the pitch is 3 µm, and the outer diameter is 56 µm.

Fig. 2
Fig. 2

Fabrication of a LPG based on microcollapsing the PCF holes with a CO2 laser beam.

Fig. 3
Fig. 3

Optical micrographs of a section of the LPG after the holes at the parts heated by the CO2 laser have completely collapsed. The inset shows a magnification of one period.

Fig. 4
Fig. 4

Transmission spectra of the LPG near 614 nm for 60 periods and CO2 laser heating times of 200, 500, and 400 ms. More coupling increases with heating time.

Fig. 5
Fig. 5

Near-field images of the transmitted light at 633 nm (a) before and (b) after writing of the LPG.

Equations (1)

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Λ=2π/βco-βcl=Lb,

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