Abstract

An error was made in converting the units of bend radius within the computer program used to obtain the reported results. This caused the calculated values of the bending induced stress to be significantly smaller than their true value. Corrected results for stress within the fiber and bend losses are reported. Since bending-induced stresses cause a relatively small correction to the refractive index profile, these corrections result in no changes in the main conclusions of this work.

© 2012 OSA

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References

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  1. B. G. Ward, “Bend performance-enhanced photonic crystal fibers with anisotropic numerical aperture,” Opt. Express 16(12), 8532–8548 (2008).
    [CrossRef] [PubMed]
  2. M. Koshiba and Y. Tsuji, “Curvilinear hybrid edge/nodal elements with triangular shape for guided-wave problems,” J. Lightwave Technol. 18(5), 737–743 (2000).
    [CrossRef]
  3. B. G. Ward, “Solid-core photonic bandgap fibers for cladding-pumped Raman amplification,” Opt. Express 19(12), 11852–11866 (2011).
    [CrossRef] [PubMed]

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Figures (13)

Fig. 1
Fig. 1

Photonic crystal fiber geometry. The stress applying parts (SAP) are indicated by a lighter shade of grey. The air holes are white. The labels “B” indicate the perfectly matched layer boundary regions.

Fig. 2
Fig. 2

A region of the revised finite element mesh near the core boundary showing both the core meshing scheme (upper right bolded hexagonal boundary) and the capillary meshing scheme (lower left bolded hexagonal boundary).

Fig. 3
Fig. 3

Stress fields in MPa for a coil diameter of 47.6 cm: σxx (a), σyy (b), σzz (c), and σxy (d). The center of the coil is on the positive x axis.

Fig. 4
Fig. 4

Calculated propagation losses as a function of air hole diameter to lattice pitch ratio (d/Λ) for the first four modes of the PCF with a coil diameter of 47.6 cm and coiling in the x direction.

Fig. 5
Fig. 5

Calculated modal intensity profiles of the first four modes of the PCF with diameter to lattice pitch ratio (d/Λ = 0.12) with a coil diameter of 47.6 cm and coiling in the x direction.

Fig. 6
Fig. 6

Calculated propagation losses as a function of air hole diameter to lattice pitch ratio (d/Λ) for the first four modes of the PCF with a coil diameter of 47.6 cm and coiling in the y direction.

Fig. 7
Fig. 7

Calculated modal intensity profiles of the first four modes of the PCF with diameter to lattice pitch ratio (d/Λ = 0.12) with a coil diameter of 47.6 cm and coiling in the y direction.

Fig. 8
Fig. 8

Calculated propagation losses as a function of coiling plane angle relative to the plane of the SAP for the first three modes of the PCF with a coil diameter of 47.6 cm and diameter to lattice pitch ratio (d/Λ = 0.12).

Fig. 9
Fig. 9

Calculated propagation losses as a function of coiling diameter for the first four modes of the PCF with d/Λ = 0.12 and coiling in the x direction. The modal intensity plot insets are logarithmic in scale and show an example of how the SAP influence the guided modes depending on the coiling diameter.

Fig. 10
Fig. 10

Calculated propagation losses as a function of coiling diameter for the first four modes of the PCF with d/Λ = 0.12 and coiling in the y direction. The modal intensity plot insets are logarithmic in scale and show an example of how the guided modes change with coiling diameter.

Fig. 11
Fig. 11

Calculated propagation losses as a function of coiling diameter for the first three modes of a step-index fiber with 40 µm core diameter and a numerical aperture of 0.06.

Fig. 12
Fig. 12

Bend-distorted mode field intensity plots of the first three modes of a step-index fiber with 40 µm core diameter and a numerical aperture of 0.06 coiled to a diameter of 6 cm. The circle on each plot indicates the extent of the core.

Fig. 13
Fig. 13

Calculated propagation losses as a function of coiling diameter for the first three modes of a step-index fiber with 40 µm core diameter and a numerical aperture of 0.035.

Tables (1)

Tables Icon

Table 1 A comparison of LP01 and LP11 modal losses for a PCF with d/Λ = 0.12 and 41mm core diameter and a SIF with a numerical aperture of 0.035 and a core diameter of 40mm. The 48 cm coil is in the x direction for the PCF. The optimal coiling diameter for the PCF is 95 cm in the y direction. The optimal coiling diameter for the SIF is 53 cm. All losses are in units of dB/m.

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