Simple Technique to Estimate Far-field Intensity of Index Guiding Photonic Crystal Fibers

Abstract: A simple approach to estimate far-field intensity of index-guiding photonic crystal fibers (PCFs) with given geometrical parameters and wavelength of light is reported. The approach is based on a previously developed simple formulation of the effective cladding indices of the same type of fibers, which is valid in the entire single mode region of such fibers. This region is defined by a prescribed upper limit of a parameter, called relative air-hole diameter. The validity of the approach has already been tested by comparing the results obtained from it with those obtained by other available methods. Since far-field measurements are helpful in characterizing various optical fibers, the far field intensity distribution of the same PCFs is studied here by application of the same formulation. The approach should find wide attention, for its simplicity and easy use, by system designers and users of index-guiding PCFs.

Keywords: Index-Guiding Photonic Crystal Fibers, Effective Cladding Index, Effective Index of Fundamental Guided Mode, Far-Field Intensity