Magneto-optical and regular photonic crystals with triangular lattice are designed to construct one-way waveguides. Accordingly, two types of efficient beam splitters with one-way input channels are proposed and investigated. One of the proposed beam splitters is a $1\times 2$ splitter, which achieves 50/50 splitting based on the structural symmetry. Since both output channels are one-way waveguides, this splitter is immune to interferences at the output ends. The other is a $1\times 3$ beam splitter, in which one output channel is a regular waveguide and the others are one-way waveguides. It is shown that the $1\times 3$ splitter can provide equal splitting ratios in the guiding band if defects with proper parameters are introduced in the splitting region.

© 2012 Optical Society of America

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