A leaky-mode directional coupler (LMDC) consisting of two slab waveguides was designed for the sake of high efficient focusing waveguide grating coupler (FWGC) using reflection pole method (RPM) and finite difference beam propagation method (FDBPM) . The out-coupled beam was designed to have a Gaussian-like shape with a single radiation angle to the emerging waveguide. The out-coupling efficiency of the present LMDC was 99% for just 1 mm coupler length.

© 2004 Optical Society of America

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