Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-17-24-21608
Timestamp: 2019-04-18 22:33:57+00:00

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A highly nonlinear composite fiber, which has a 1.5 μm chalcogenide glass core surrounded by a tellurite glass microstructure cladding, has been fabricated by the method of stack and draw. A tellurite glass capillary containing a As2S3 rod was sealed with negative pressure inside. Then this capillary and other empty capillaries were stacked into a tellurite glass tube, and elongated into a cane. This cane was then inserted into another tellurite glass jacket tube and drawn into the composite microstructure fiber. The fiber has a flattened chromatic dispersion together with a zero dispersion wavelength located in the near infrared range. The propagation losses at 1.55 μm were 18.3 dB/m. The nonlinear coefficient at 1.55 μm was 9.3 m−1W−1. Such a high nonlinear coefficient counteracts the high propagation losses to a large extent. A supercontinuum spectrum of 20-dB bandwidth covering 800-2400 nm was generated by this composite microstructure fiber.
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Fig. 1 Schematic diagram for the fabrication of the cane: a. As2S3 glass rod with larger diameter, b. elongated As2S3 glass rods, c. tellurite capillary to hold the As2S3 glass rod, d. tellurite capillaries for the holes in the cladding of the fiber, e. tellurite capillary with As2S3 glass rod inside, f. tellurite tube to be stacked with capillaries, g. cane, h. enlarged cross section of the cane.
Fig. 2 Scanning electron microscope image of the cross section of the As2S3-tellurite composite microstructure fiber.
Fig. 3 Calculated confinement loss of the fundamental mode for the As2S3-tellurite composite microstructure fiber.
Fig. 4 Chromatic dispersion of the fundamental mode in the As2S3-tellurite composite microstructure fiber and the calculated mode field (inset a) of the fundamental mode at 1550 nm. The chromatic dispersion of the fundamental mode in a step-index air-clad As2S3 glass fiber with the core diameter of 1.5 μm is shown for comparison.
Fig. 5 Supercontinuum spectrum from the As2S3-tellurite composite microstructure fiber pumped by a 1.85 μm femtosecond laser.
Table 1 Nonlinear coefficient γ, maximum effective fiber length Leff-max, figure of merit γ×L eff-max, effective fiber length of 1 cm fiber Leff-1cm, and figure of merit γ×Leff-1cm for various highly nonlinear fibers (HF).
Nonlinear coefficient γ, maximum effective fiber length Leff-max, figure of merit γ×L eff-max, effective fiber length of 1 cm fiber Leff-1cm, and figure of merit γ×Leff-1cm for various highly nonlinear fibers (HF).

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