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28 November 20111×3 optical drop splitter in a rod-type silicon photonic crystal
We report an 1×3 optical drop splitter (ODS) based on a self-collimation ring resonator (SCRR) in a rod-type silicon
photonic crystal. The proposed 1×3 ODS consists of four beam splitters which are formed by changing the radius of one
row of silicon rods. When the self-collimated light with resonance frequency is launched into the ODS, the light beam
can be split into three parts come out from three drop ports while no light coming out from the through port. The splitting
ratio of the three drop beams can be controlled by tuning the radii of the beam splitters. The FDTD method is employed
to calculate the transmission of the 1×3 ODS. For the drop wavelength of 1550 nm, the free spectral range is 28.7 nm,
which almost covers the whole optical communication C-band window. This 1×3 ODS may have applications in
photonic integrated circuits.