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Polarization insensitive 3-dB directional coupler based on sub-wavelength grating structure

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Abstract

We propose and theoretically demonstrate a polarization insensitive 3-dB directional coupler. The polarization extinction ratio has an imbalance less than 0.5dB over C-band. The footprints of the coupler is 7.4 μm × 2.3μm.

© 2015 Optical Society of America

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