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In this letter, we report a novel uniform grating coupler, which can couple the light of different polarization from fiber into a single waveguide at same wavelength range. When incident wavelength is 1550nm, for TE mode, the coupling efficiency can achieve more than 50% with ∼30nm 1dB bandwidth. For TM mode, the coupling efficiency can also obtain more than 50% and 35nm 1dB bandwidth. Their corresponding...
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