Genetic-Algorithm-Optimized Wideband On-Chip Polarization Rotator with an Ultrasmall Footprint

With a genetic algorithm, we designed an on-chip TEo- TMo polarization rotator with a footprint of 0.96 μm × 4.2 μm and experimentally demonstrated its conversion loss of ~2.5 dB and extinction ratio of ~10 dB in the wavelength range of 1440–1580nm.

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