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Highly compact polarization-independent grating coupler

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Abstract

We propose a compact polarization-independent output grating coupler, which consists of T-shaped grooves. For only 20 periods on a silicon-on-insulator wafer with a 260nm thick top silicon layer, the output coupling efficiencies for both the TE and the TM modes are larger than 50% in the wavelength range of 1480–1580nm and are approximately 58% around 1550nm. The polarization-dependent loss of the device is within 0.05dB in the range of 15101580nm.

© 2010 Optical Society of America

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