National Taiwan University Institute of Communication EngineeringChiang, Jung-ShengJung-ShengChiangTZONG-LIN WU2006-11-142018-07-052006-11-142018-07-05200600304018http://ntur.lib.ntu.edu.tw//handle/246246/2006111501243606http://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501243606/1/1936.pdfhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-29344464278&doi=10.1016%2fj.optcom.2005.08.008&partnerID=40&md5=d4fd15b3a35cb3236cd1dac9aba67386An octagonal photonic crystal fiber (O-PCF) structure with eight air-holes on the first ring is proposed based on a unit isosceles triangle. The propagation characteristics and cut-off behaviors of the O-PCF and the standard hexagonal PCF (H-PCF) are numerically investigated by combining the vector boundary method and the effective area method. The phase boundaries for cut-off, single-mode, and multi-mode operations between the O-PCF and H-PCF are calculated and compared. It is found that under the same pitch Λ and air filling fraction (AFF) of the air-holes the O-PCF has significantly wider wavelength range operating in single-mode region, more circular-like field distribution, and less confinement loss than the H-PCF. © 2005 Elsevier B.V. All rights reserved.application/pdf587365 bytesapplication/pdfzh-TWAir filling fractionPhotonic crystal fiberSingle-modeVector boundary element methodBoundary element method; Crystal structure; Crystalline materials; Vectors; Wave propagation; Air filling fraction; Photonic crystal fibers; Single-mode; Vector boundary element method; Optical fibersjournal article10.1016/j.optcom.2005.08.0082-s2.0-29344464278http://ntur.lib.ntu.edu.tw/bitstream/246246/2006111501243606/1/1936.pdf