## Abstract

The self-imaging phenomena in multimode Bragg reflection waveguides (BRWs) have been predicted and investigated by using the plane-wave expansion method and the finite-difference time-domain method. A compact wavelength splitter based on self-imaging principles in BRWs is presented, and its transmission characteristics are investigated by using the finite-difference time-domain method. Calculated results indicate that, for the wavelength splitter without any waveguide bend optimizations, two optical waves with different wavelengths can be spatially separated, and corresponding transmittances are 95.6% and 90.1%, respectively. The simple and compact wavelength splitter is expected to be applied to highly dense photonic integrated circuits.

© 2012 Optical Society of America

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