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We consider the coupling between four photonic crystal waveguide as a multimode interference system and showed that the dispersion curves of the eigenmodes intersect or almost intersect. Degenerate modes appear in the system. At the crossing point, the multimode interference is deprived and power is confined to its input direction without observable transfering to other photonic crystal waveguides...
In this paper, we design a ultra-short 1×2 1310/1550 nm double-waveguide optical power splitter based on photonic crystal multimode interference. The device can be used to divide the input beam equally for both 1310nm and 1550nm at the same time. The total multimode waveguide length of this device is only about 13 um, which is one 210th of the conventional dielectric counterparts reported. On the...
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