Bragg gratings are fabricated in all-solid photonic bandgap fibers by forming a longitudinal periodic index modulation over the high-index rod lattice in the cladding. Due to its unique index-modulation pattern and the modal properties of the fiber, resonance couplings to the LP01 supermodes (also known as high-index rod modes) are observed. The corresponding peak is located at the long-wavelength side of the Bragg wavelength and presents the highest depth. The asymmetric index profile over the high-index rods, which is induced by side UV illumination, leads to broadening of the supermode resonance peaks and variation with fiber orientation in the bend response of the fiber grating.

© 2007 Optical Society of America

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2006 (1)

2004 (1)

2003 (2)

2001 (1)

1997 (1)

T. Erdogan, J. Lightwave Technol. 15, 1277 (1997).

Bird, D. M.

Birks, T. A.

de Sterke, C. M.

Dunn, S. C.

Eggleton, B. J.

Erdogan, T.

T. Erdogan, J. Lightwave Technol. 15, 1277 (1997).

George, A. K.

Hale, A.

Hedley, T. D.

Kerbage, C.

Knight, J. C.

Litchinitser, N. M.

Luan, F.

McPhedran, R. C.

Pearce, G. J.

Russell, P. St. J.

Usner, B.

Wang, A.

Westbrook, P. S.

White, T. P.

Windeler, R.

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Figures (4)

Fig. 1
Fig. 1

Core modes and bandgaps of the all-solid bandgap fiber. Inset, spatial field of the core mode at 1540 nm .

Fig. 2
Fig. 2

Transmission and reflection spectra of the FBG photoinscribed in all-solid bandgap fiber.

Fig. 3
Fig. 3

Phase-matching curves for the mode couplings for the FBG in the bandgap fiber.

Fig. 4
Fig. 4

(a) Transmission spectrum of the FBG when the lateral offset between the launched single-mode fiber and the FBG is 7 μ m . (b) Split of the supermode resonance peak A when the FBG is bent with a curvature radius of 4.5 cm .

Equations (1)

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κ = r o d s ω ε 0 2 ( Δ n ) 2 E g u i × E r e s d A .