Abstract
Surface grating couplers enable an efficient way to couple light between a sub-micron Si waveguide and an optical fiber. Furthermore, simple implementation and wafer-scale testing capability makes it a versatile coupling technique. Recently, subwavelength grating (SWG) based couplers has gained wide interest. Mainly, driven by flexibility in refractive index modulation and fabrication tolerance, SWG couplers allows a partial solution to improve coupling efficiency (CE) and operation bandwidth (BW); the two performance metrics of a light-chip coupler. In this paper, we present subwavelength based couplers with CE in excess of 95 % and a 3dB BW 85 nm by engineering the grating dispersion, mode matching and directionality and show the limits and trade-off’s in achieving high performance.
© 2015 IEEE
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