Abstract
A slot-assisted polarization rotator is proposed and analyzed. Through introducing a slot in the channel waveguide yet deviated from the waveguide center, the hybrid modes are excited effectively, which contributes to the mode rotation. However, the excess loss is intrinsically high due to the mode mismatch between the slot waveguide and channel waveguide. Thus, two sections of tapered slot waveguides are inserted in the front and rear slot-channel splices, and the slot tip width and the length are chosen to be 40nm and 1μm, resulting in higher transmission and less excess loss. The whole length of the slot waveguide is 52.8μm including the two tapered sections, and the transmission is higher than 97% at 1550nm with about 35dB polarization extinction ratio. The wavelength bandwidth is about 60nm (1520–1580nm) with the extinction ratio higher than 12dB and the excess loss less than 0.15dB.
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