Abstract

We describe two all-fiber devices for converting light from the fundamental mode to the second-order set of modes in optical fibers. The first is made by controlled hole collapse in a photonic crystal fiber, and the second is a twisted fused coupler made from few-moded conventional fiber. As well as having applications within fiber optics, the devices can be used to generate azimuthally polarized free-space beams.

© 2008 Optical Society of America

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References

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G. Volpe and D. Petrov, Opt. Commun. 237, 89 (2004).
[CrossRef]

2003 (1)

Q. Zhan, J. Opt. A 5, 229 (2003).
[CrossRef]

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2000 (1)

1995 (1)

1992 (1)

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Figures (5)

Fig. 1
Fig. 1

Electric field directions of the six lowest-order polarization modes of a circular multimode fiber core. The propagation constant decreases and the mode order increases from left to right. The HE modes are degenerate pairs.

Fig. 2
Fig. 2

(upper) Schematic longitudinal cross section of the PCF mode convertor, showing core areas in dark gray. (lower) Optical micrographs of the holey region in the cleaved fiber in each of sections A–E, to the same scale.

Fig. 3
Fig. 3

(a) Measured output far-field pattern of a PCF mode convertor at 1500 nm . (b) (not to scale) Far-field patterns passed through a polarizer transmitting electric field along the arrows shown above.

Fig. 4
Fig. 4

(upper) Schematic null coupler mode converter. (lower) Powers in the pretapered (a) and unpretapered (b) output fibers of such a device at 633 nm versus twist angle for input light in the pretapered fiber with polarization adjusted to maximize the effect of twist. The insets are far-field images for the twist angles indicated.

Fig. 5
Fig. 5

(a) Measured output far-field pattern of a null coupler mode converter at 633 nm . (b) (not to scale) Far-field patterns passed through a polarizer transmitting electric field along the arrows shown above.

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