Abstract
Photonic crystal fibers (PCFs) form a novel class of optical fibers that have attracted a considerable amount of interest due to their unconventional properties.1–3 The main difference between standard fibers and PCFs is that the cladding in PCFs may consist of pure silica with an array of air holes running along the length of the fiber. PCFs are divided into two groups, depending on the guiding mechanism.The light is guided either by modified total internal reflection (M-TIR) or by the pho-tonic bandgap (PBG) effect.1 In this presentation, we will focus on index-guiding PCFs. This choice is due to the larger availability of index-guiding PCFs and relatively close resemblance to standard fibers.For almost any application,if PCFs are to be a competitive alternative or complement to standard optical fibers, an in-depth understanding of these fiber’s coupling properties are necessary. However, at present, very few studies of coupling issues of PCFs have been presented in literature.2,3 In this work, we present a general treatment of coupling to PCFs, focusing on fundamental aspects of the PCF mode distributions, such as their overlap to gaussian beams and the angular dependency of transversal offset.
© 2002 Optical Society of America
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