%0 Journal Article
%T Multichannel high-bandwidth coupling of ultradense silicon photonic waveguide array to standard-pitch fiber array
%A Lee, B. G.
%A Assefa, S.
%A Green, W. M. J.
%A Min Yang
%A Schow, C. L.
%A Jahnes, C. V.
%A Sheng Zhang
%A Singer, J.
%A Kopp, V. I.
%A Kash, J. A.
%A Vlasov, Y. A.
%J J. Lightwave Technol.
%D 2011
%V 29
%N 4
%F Lee_etal2011
%O exported from refbase (https://db.rplab.ru/refbase/show.php?record=849), last updated on Sun, 22 May 2016 17:32:27 -0500
%X A multichannel tapered coupler interfacing standard 250-μm-pitch low-numerical-aperture (NA) polarization-maintaining fiber arrays with ultradense 20- μm-pitch high-NA silicon waveguides is designed and fabricated. The coupler is based on an array of 12 dual-core glass waveguides on 250-μ m pitch that are tapered to a 20- μm pitch, simultaneously providing both pitch and spot-size conversion. At the wide end, the inner core matches the NA and mode profile of standard single-mode fiber. When drawn and tapered, the inner core “vanishes” and the outer core, surrounded by the clad, matches the NA and mode profile of the on-chip photonic waveguide. Ultradense high-efficiency coupling to an array of Si photonic waveguides is demonstrated using a 12-channel polarization-maintaining-fiber pigtailed tapered coupler. Coupling to Si waveguides is facilitated using SiON spot-size converters integrated into the Si photonic IC to provide 2-3-μm mode field diameters compatible with the tapered coupler. The tapered coupler achieves <; 1 dB coupling losses to photonic waveguides. Furthermore, eight-channel coupling is shown with less than -35 dB crosstalk between channels. Finally, a 640-Gb/s wavelength-division-multiplexing signal is coupled into four waveguides occupying 80 μm of chip edge, providing 160-Gb/s per-channel bandwidths.
%K optical waveguides
%K from chiralphotonics
%P 475-482