L. Liu, Q. Deng, Z.Zhou*
April  2016 /Vol. 41, No. 7 / Optics Letters

Abstract:This Letter presents both numerical and experimental results of a polarization-independent directional coupler based on slot waveguides with a subwavelength grating. The measured coupling efficiency is 97.4% for TE and 96.7% for TM polarization at a wavelength of 1550 nm. Further analysis shows that the proposed subwavelength grating directional coupler has a fabrication tolerance of 20 nm for the grating structure and that the coupling efficiencies for the two polar-izations are both higher than −0.5 dB ( 89%), exceeding the entire C-band (1525-1570 nm) experimentally.


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