Controlling the chromatic dispersion of soft glass highly nonlinear fiber through complex microstructure
Controlling the chromatic dispersion of soft glass highly nonlinear fiber through complex microstructure
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DOI：
10.1016/j.jnoncrysol.2010.02.008
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发表时间：
2010-10
影响因子：
3.5
通讯作者：
M. Liao;Xin Yan;G. Qin;C. Chaudhari;Yasutake Suzuki
中科院分区：
文献类型：
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作者：
M. Liao;Xin Yan;G. Qin;C. Chaudhari;Yasutake Suzuki
软玻璃高度非线性光纤具有高度的非线性和较宽的透明范围，但由于制备技术的不成熟，其色散还远不能自由定制。在本研究中，利用包层中的复杂微结构来控制软玻璃高非线性光纤的色散。制备了芯径为1.8μm，周围有四个环孔的碲酸盐玻璃光纤。预制件的制备采用管内铸棒堆叠的方法。研究了芯径为1.5μm的硫化物-碲酸盐玻璃复合纤维的包层结构。他们的预制件是用堆叠和拉拔的方法制备的。在两种纤维的拉伸过程中，向预制件的孔洞中注入充气压力的氮气，以克服表面张力和重塑微观结构。亚碲酸盐复合微结构光纤的色散比阶跃折射率空气包层光纤的色散平坦得多。硫化物-碲酸盐玻璃复合光纤在近红外波段具有零色散波长(ZDW)。对于由硫系玻璃制成的纤维，在近红外范围内实现ZDW是以前没有过的。同时，如果不考虑锥形光纤，包层大孔的复合微结构光纤具有最高的非线性。所制备的光纤显示了覆盖一个倍频程以上的超连续谱，没有精细结构。
Soft glass highly nonlinear fibers have high nonlinearity and a broad transparency range, but their chromatic dispersion is far from being freely tailored until now due to the immaturity in fabrication technology. In this research, the chromatic dispersion of soft glass highly nonlinear fibers was controlled by using the complex microstructure in the cladding. A tellurite glass fiber which had a 1.8μm core surrounded by four ring holes was fabricated. The preform was fabricated by the method of cast rod in tube and stack. The chalcogenide–tellurite glass composite fibers which had a 1.5μm core surrounded by tellurite microstructure cladding were demonstrated. Their preform was fabricated by the method of stack and draw. In the fiber-drawing process of both types of fibers an inflation pressure of nitrogen gas was pumped into the holes of the preform to overcome the surface tension and to reshape the microstructure. The tellurite complex microstructured fiber has a chromatic dispersion much more flattened than that of step-index air-clad fiber. The chalcogenide–tellurite glass composite fibers have the zero dispersion wavelength (ZDW) in the near-infrared range. Having the ZDW in the near-infrared has not been realized before for the fibers made from chalcogenide glass. Meanwhile, the composite microstructured fiber with large holes in the cladding has the highest nonlinearity of all highly nonlinear fibers if the tapered fibers are excluded. Supercontinuum spectra covering over one octave, free of fine structures, were demonstrated by the fabricated fibers.