| 摘要: |
| 空芯光子晶体光纤（HC-PCF）因其利用纤芯的空气导光而具有高损伤阈值、低损耗、低色散、低非线性等优点。此外，HC-PCF纤芯中空气的折射率温度系数、Verdet系数、Kerr系数远小于石英，在光纤陀螺中有独特的优势。但是在向实际应用迈进的过程中，必须要解决HCPCF与普通单模光纤以及自身简便、低损耗的熔接问题。基于热致扩芯技术和过渡光纤两种模场匹配方法，研究了HC-PCF和普通单模光纤之间的熔接问题，将两者的熔接损耗由直接熔接的1.4dB降至0.73dB。此外，研究了HC-PCF与其自身的熔接，通过两步放电熔接法，得到高强度低损耗的熔点，熔接损耗为0.52dB。 |
| 关键词: 光子晶体光纤 空芯光纤 光纤陀螺 熔接损耗 模场匹配 |
| DOI： |
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| 基金项目:国家自然科学基金（61377098） |
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| Fusion Splice Technique of Hollow Core Photonic Crystal Fiber |
| LI Xiao-qian,GAO Shou-fei,WANG Ying-ying,WANG Pu |
| (Institute of Laser Engineering,Beijing University of Technology，Beijing 100124, China) |
| Abstract: |
| In a hollow core photonic crystal fiber(HC-PCF), light is guided in the hollow air core with the merits of low transmission loss, low dispersion, low nonlinearity and high damage threshold The thermal coefficients of refractive index, Verdetconstant and Kerrconstant of the air core are much smaller than those of the sillica, making HC-PCF a promising candidate for fiber optical gyro. However, when marching towards practical applications,the issue of fusion splicing a HC-PCF with a single mode fiber, and with HC-PCF itself must be solved properly. In this paper, a low-loss fusion splice between a HC-PCF and a conventional single mode fiber is achieved by introduction of an intermediate fiber and thermal expansion core technique. Compared to the direct splicing technique, which yields a splice loss of 1.4dB, the overall insertion loss using the intermediate fiber technique has a loss of only 0.73dB. What's more, the self-splice technique of HC-PCF is also presented. Through two steps of arc-splice,the splice strength of HC-PCF to itself is guaranteed and the splice loss is reduced to 0.52dB. |
| Key words: Photonic crystal fibers Hollow-core fiber Fiber optical gyro Splice loss Mode field match |
