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16 February 2010Taper-integrated multimode-interference based crossings for silicon wire waveguides
Novel multimode-interference (MMI)-based crossings integrated with miniaturized tapers are numerically presented for
Silicon wire waveguides. These miniature tapers function as field expanders to reduce transition loss between the
input/output waveguide and the MMI region and the crosstalk in the crossing section. As a consequence, the lengths of
MMI sections reduce to less than twice of the beat length. Using finite different time domain method, we demonstrate
that the MMI-based waveguide crossing embedded in the quadratic tapers has the size of 5800x5800 nm2, the insertion
loss of 0.15 dB and the crosstalk of -42 dB at the wavelength of 1550 nm and broad transmission spectrum ranging from
1500 nm to 1600 nm.