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Strong infrared spectral broadening in low-loss As-S chalcogenide suspended core microstructured optical fibers

M. El-Amraoui, J. Fatome, J. C. Jules, B. Kibler, G. Gadret, C. Fortier, F. Smektala, I. Skripatchev, C.F. Polacchini, Y. Messaddeq, J. Troles, L. Brilland, M. Szpulak, and G. Renversez

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Abstract

We report the fabrication and characterization of the first guiding chalcogenide As2S3 microstructured optical fibers (MOFs) with a suspended core. At 1.55 µm, the measured losses are approximately 0.7 dB/m or 0.35 dB/m according to the MOF core size. The fibers have been designed to present a zero dispersion wavelength (ZDW) around 2 µm. By pumping the fibers at 1.55 µm, strong spectral broadenings are obtained in both 1.8 and 45-m-long fibers by using a picosecond fiber laser.

©2010 Optical Society of America

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Figures (6)
Fig. 1
Fig. 1 : Computed waveguide chromatic dispersion Dw (thin upper curves), chromatic dispersion D (thick lower curves) for several suspended core As2S3 MOF. Material chromatic dispersion Dmat (black line). The configurations with a core size of 2.3 and 2.6 µm correspond to the two MOFs studied in section 4. The Sellmeier coefficients are the ones given for As2S3 by J. S. Browder & al. in Handbook of Infrared Optical Materials, P. Klocek editor, Marcel Dekker, ISBN: 0-8247-8468-5, (1991).

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Fig. 2
Fig. 2 : Typical attenuation curve of a single index As2S3 optical fiber.

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Fig. 3
Fig. 3 SEM pictures of two As2S3 suspended core fibers with a core size of 2.6µm (a) and 2.3µm (b).

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Fig. 4
Fig. 4 : Comparison between the experimental chromatic dispersion curves of 2.3-µm (circles) and 2.6-µm (triangles) As2S3 suspended core fibers and their corresponding numerical results (blue and red solid lines, respectively).

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Fig. 5
Fig. 5 : Output spectra (blue solid line) recorded from the 1.8-m long 2.6-µm core diameter suspended core fiber for input peak powers of (a) 18 W (b) 28 W and (c) 54 W. Corresponding numerical simulations are also reported with black lines and crosses.

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Fig. 6
Fig. 6 : Spectrum recorded experimentally at the output of the 45-m long segment of our 2.3-µm suspended core fiber for an input peak power of 54 W.

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