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首页> 外文会议>Symposium on Materials and Devices for Optoelectronics and Microphotonics, Apr 1-5, 2002, San Francisco, California >Hole-Assisted Lightguide Fiber - A Practical Derivative of Photonic Crystal Fiber
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Hole-Assisted Lightguide Fiber - A Practical Derivative of Photonic Crystal Fiber

机译：空穴辅助光导纤维-光子晶体光纤的实用衍生物

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Usage of air holes in optical fibers has become a hot subject in fiber optics because of the possibilities for novel transmission properties. Although photonic crystal fibers based on photonic bandgap guidance are the most drastic innovation in this subject, optical fibers containing air holes but not having photonic crystal structures are also being intensively studied. Such air-silica microstructured fibers are more practical than the photonic bandgap fibers because the lack of photonic crystal structure makes the fabrication far easier. Even without the photonic bandgap, the microstructured fibers can exhibit valuable properties in terms of group velocity dispersion and nonlinearity, because the index contrast between air and silica is 10 or more times as large as that of the conventional optical fibers based on doped silica glasses. However, one of the major challenges for practical applications of the air-silica microstructured fibers has been their high transmission losses, which have been several tens to hundreds times higher than those of the conventional fibers. As a solution to this problem, we have proposed a more practical structure called hole-assisted lightguide fiber (HALF). In addition to the air holes for realizing novel optical properties, this structure has a material index profile for waveguiding, and hence is closer to the conventional fibers than the other microstructured fibers are. As a result, novel optical properties can be realized without severe degradation in transmission loss. In experiments, an anomalous group velocity dispersion as large as +35 psm/km at 1550 nm wavelength, which would be unattainable in the conventional fibers, has been realized with a loss of 0.41 dB/km, which is comparable to those of the conventional fibers. Analyses of the losses of the fabricated HALFs suggest that the loss should be lowered by mitigating the effect of the drawing tension and minimizing the power fraction in the holes. It is also shown that the full-vector finite element method realizes accurate modeling of the properties such as dispersion and macrobend loss.
机译：由于可能具有新颖的传输特性，因此在光纤中使用气孔已成为光纤中的热门话题。尽管基于光子带隙引导的光子晶体光纤是该主题中最激烈的创新，但包含气孔但不具有光子晶体结构的光纤也正在得到深入研究。这样的空气二氧化硅微结构纤维比光子带隙纤维更实用，因为缺少光子晶体结构使得制造容易得多。即使没有光子带隙，由于空气和二氧化硅之间的折射率差是基于掺杂石英玻璃的传统光纤的折射率的10倍或更多倍，因此微结构化纤维仍可以表现出群速度色散和非线性方面的宝贵性能。然而，空气-二氧化硅微结构纤维的实际应用的主要挑战之一是它们的高传输损耗，其比常规纤维的传输损耗高数十至数百倍。为了解决这个问题，我们提出了一种更实用的结构，称为空穴辅助光导纤维（HALF）。除了用于实现新颖的光学特性的气孔之外，该结构还具有用于波导的材料折射率分布，因此比其他微结构纤维更接近常规纤维。结果，可以实现新颖的光学性能而不会严重降低传输损耗。在实验中，已经实现了在1550 nm波长处高达+35 ps / nm / km的异常群速度色散，这在常规光纤中是无法实现的，其损耗为0.41 dB / km，与之相比，损耗为0.41 dB / km。常规纤维。对制成的半成品的损耗的分析表明，应通过减轻拉伸张力的影响并使孔中的功率分数最小化来降低损耗。还表明，全矢量有限元方法实现了诸如色散和宏弯损耗等特性的精确建模。

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