Abstract

We have incorporated perfectly matched layers (PMLs) into our iterative Fourier modal method to tackle radiation losses in microstructured optical fibers (MOFs). For the inclusion of PMLs, first we have adapted our numerical procedure both to handle conductive and absorptive anisotropic materials and to search directly for the eigenvalues that are close to a certain fixed value. Secondly, we have designed a novel type of cylindrical PMLs in which the conductivity increases radially, suiting quite well with the fiber radiation modes. The description of the PMLs as an anisotropic material has allowed us to use a different coordinate system to describe either the 2D wave equation or the PMLs themselves. Once the calibration process of the PMLs is successfully ended, radiation losses can be estimated accurately. Finally, this technique is applied to model radiation losses for specialty MOFs used for sensing applications.

© 2008 AIP