%0 Journal Article %J Photonics Journal, IEEE %D 2015 %T Apodized Focusing Fully Etched Sub-wavelength Grating Couplers %A , Yun Wang %A Yun, Han %A , Zeqin Lu %A , Richard Bojko %A , Wei Shi %A , Xu Wang %A , Jonas Flueckiger %A , Fan Zhang %A , Michael Caverley %A , Nicolas Jaeger %A Chrostowski, Lukas %U http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7097646 %X We experimentally demonstrate apodized focusing sub-wavelength grating couplers for both the fundamental transverse electric (TE00) mode and the fundamental transverse magnetic (TM00) mode. A measured insertion loss of 3.2 dB with a 1-dB bandwidth of 36 nm has been obtained for the TE00 mode and a measured insertion loss of 3.3 dB with a 1-dB bandwidth of 37 nm has been obtained for the TM00. Back reflections of -24 dB and -21 dB have been obtained for the TE00 and TM00 modes, respectively. %8 04/2015