Extremely High-Efficiency Coupling Method for Hollow-Core Photonic Crystal Fiber

作者：Fan, Danyun; Jin, Zhiqiang; Wang, Guanghui^*; Xu, Fei; Lu, Yanqing; Hu, Dora Juan Juan; Wei, Lei; Shum, Ping; Zhang, Xuping

来源：IEEE Photonics Journal, 2017, 9(3): 7104108.

DOI：10.1109/JPHOT.2017.2697969

• Fiber optics
• fiber optics sensors
• photonic crystal fibers
• fiber optics components

We report a novel low-loss splicing approach for hollow-core photonic crystal fiber (HC-PCF) and conventional single mode fiber (SMF) by inserting an etched SMF tip into the hollow core. If the divergence solid angle (DSA) of the inserted fiber tip is smaller than the guiding solid angle (GSA) of HC-PCF, all the radiated optical power from the tip will be collected by PCF with an extremely high coupling efficiency and guided by the PCF based on photonic bandgap effect. A DSA-GSA matching model is proposed to calculate the efficiency for different splicing situations. In the optimal condition of GSA > DSA, the transmission loss could approach zero, only including the scattering loss of etched fiber. Then, we experimentally demonstrate the splicing between NKT HC19-1550-01 and SMF28 with coupling efficiency of 84.5%, agreeing well with the theoretical result of 85%. In addition, our proposed method is coaxiality error free, angle deviation free, and insertion length insensitive. This new technique is expected to provide new possibilities in some special system designs for HC-PCF-based applications.

• 出版日期2017-6
• 单位南京大学