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A new algorithm for calculating the confinement loss of leaky modes in arbitrary fibre structures is presented within the scalar wave approximation. The algorithm uses a polar-coordinate Fourier decomposition method with adjustable boundary conditions (ABC-FDM) to model the outward radiating .elds. Leaky modes are calculated for different examples of microstructured fibres with various shaped holes.

Fourier decomposition algorithm for leaky modes of fibres with arbitrary geometry