Abstract

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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References

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

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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 .

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