We have fabricated tapered photonic crystal fibers using a fusion splicer and experimentally observed the near-field mode distribution and the beam divergence of it. We have also compared characteristics of the tapered photonic crystal fiber with those of a tapered standard single-mode fiber. Unlike a tapered standard single-mode fiber, the mode field profile of a tapered photonic crystal fiber shows a good confinement of its field within the core region. The numerical apertures of tapered photonic crystal fibers are increased as the diameter of the fiber is decreased.
Bibliographical noteFunding Information:
Received 2 May 2003; accepted 30 June 2004. This work was supported in part by the Korea Science and Engineering Foundation through the Ultra-Fast Fiber-Optic Networks Research Center, and the Korean Ministry of Education & Human Resources Development through the Brain Korea 21 Program. Address correspondence to Youngchun Youk, Department of Information and Communications, Kwangju Institute of Science and Technology, Gwangju, 500-712 Korea. E-mail: ycyouk@ kjist.ac.kr
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics