2003/10/30 by Niels Asger Mortensen, Martin Dybendal Nielsen
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Advanced Photonic Communication Systems #Photonic Crystal and Fiber Optics #cond-mat #physics.optics
paper · pdf · doi:10.1364/ol.29.000349
published as Opt. Lett. 29, 349 (2004). · 3 pages including 5 figures. Accepted for Optics Letters
arxiv created 2003/10/30 · openalex publication_date 2004/02/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Cladding structures of photonic bandgap fibers often have airholes of noncircular shape, and, typically, close-to-hexagonal airholes with curved corners are observed. We study photonic bandgaps in such structures by aid of a two-parameter representation of the size and curvature. For the fundamental bandgap we find that the bandgap edges (the intersections with the air line) shift toward shorter wavelengths when the air-filling fraction f is increased. The bandgap also broadens, and the relative bandwidth increases exponentially with f2. Compared with recent experiments [Nature 424, 657 (2003)] we find very good agreement.