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Extruded soft glass photonic crystal fiber for ultrabroad supercontinuum generation

V. V. Ravi Kanth Kumar, A. K George, W. H. Reeves, J. C. Knight, P. St. J. Russell, F.G. Omenetto, and A. J Taylor

Open Access Open Access

Abstract

We report the fabrication and properties of soft glass photonic crystal fibers (PCF’s) for supercontinuum generation. The fibers have zero or anomalous group velocity dispersion at wavelengths around 1550 nm, and approximately an order of magnitude higher nonlinearity than attainable in comparable silica fibers. We demonstrate the generation of an ultrabroad supercontinuum spanning at least 350 nm to 2200 nm using a 1550 nm ultrafast pump source.

©2002 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Preform (left, optical micrograph) and fiber (right, electron micrograph) fabricated from SF6 glass by extrusion. The preform (left) is 1mm in outer diameter, and was jacketed prior to drawing the fiber shown on the right. The fiber has a nominal 2.6μm core dimension, and the glass strands in the second ring of air holes are 150nm across and 6μm in length..

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Fig. 2.
Fig. 2. Observed loss in SF6 PCF with a 2.6 μm core, as shown in Fig. 1. The data points for the bulk glass are from [6]. The curve is the result of a cutback measurement using a white light source.

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Fig. 3.
Fig. 3. Near-field pattern observed in a fiber similar to that shown in Fig. 1. The excitation source is a halogen lamp and the core diameter is 2.6μm.

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Fig. 4.
Fig. 4. Measured group-velocity dispersion curves for bulk SF6 (broken curve) and for the fundamental mode in fibers with four different core sizes

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Fig. 5.
Fig. 5. Optical spectrum of the continuum observed at the output of a 75 cm length of 2.6 μm core fiber.

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Fig. 6.
Fig. 6. Visible supercontinuum generation in an SF6-PCF of several meters length. The ultrashort pulse train at 1550nm is incident into the fiber from the top left, and the color variation is partly due to the strong wavelength dependent loss in the visible. For 200 mW incident power, the generated spectrum extends from below 350 nm to beyond 2.2 μm.

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