Abstract:
We describe the differential multipole method, an extended multipole method used to calculate the modes of
microstructured optical fibers with noncircular inclusions. We use a multipole expansion centered on each
inclusion and a differential method to calculate the scattering properties of the individual inclusions. Representative
results for a flber with one ring of elliptical inclusions are presented, and a direct comparison is made
with an existing method. The new method is also applied to a microstructured optical fiber with seven rings
of elliptical inclusions, which is found, in effect, to support a single polarization of the fundamental mode.
