Abstract

In the conventional design of a waveguide-grating router (WGR) which has a Gaussian-shaped diffraction pattern at the location of the output waveguides, some portion of the power of the light beam always leaks out into unused diffraction orders next to the designed central order. This power-leakage is significant for the output ports close to the side ends. Hence, the insertion loss figures at the side ports are by about 2-3 dll higher than those of the central output ports.¹

© 2001 Optical Society of America