Ha Woosung, Jeong Yoonseob, Park Jiyoung, Oh Kyunghwan, Kobelke Jens, Schuster Kay, Schwuchow Anka
Institute of Physics and Applied Physics, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea.
Opt Express. 2010 Aug 30;18(18):19070-5. doi: 10.1364/OE.18.019070.
A new type of an all-solid photonic bandgap fiber for a non-phase-matched tunable band-rejection filter was proposed and fabricated by introducing a hexagonal array of high-index rods surrounded by graded-index pedestals in silica cladding. Due to the graded index and subsequent weak confinement of light, the proposed fiber showed two contrasting transmission spectra: flat transmission for a long fiber segment of ~1 m in contrast to typical bandgap transmission in a short fiber segment of ~10 cm. For the 120-cm-long fiber, we observed unique band-rejection transmission without any requirement of phase-matching conditions, whose rejection strength was tunable by mechanical perturbations such as bending and twisting. Detailed device principles, fiber design, fabrication, and transmission characteristics are discussed in both theory and experiment.
通过在二氧化硅包层中引入由渐变折射率基座包围的高折射率棒的六边形阵列，提出并制造了一种用于非相位匹配可调谐带阻滤波器的新型全固态光子带隙光纤。由于渐变折射率以及随后对光的弱限制，所提出的光纤呈现出两种截然不同的传输光谱：对于约1 m的长光纤段，传输是平坦的，而对于约10 cm的短光纤段，则是典型的带隙传输。对于120 cm长的光纤，我们观察到独特的带阻传输，无需任何相位匹配条件，其抑制强度可通过弯曲和扭转等机械扰动来调节。从理论和实验两方面讨论了详细的器件原理、光纤设计、制造和传输特性。
