TY  - JOUR
AU  - Lee, B. G.
AU  - Assefa, S.
AU  - Green, W. M. J.
AU  - Min Yang
AU  - Schow, C. L.
AU  - Jahnes, C. V.
AU  - Sheng Zhang
AU  - Singer, J.
AU  - Kopp, V. I.
AU  - Kash, J. A.
AU  - Vlasov, Y. A.
PY  - 2011
DA  - 2011//
TI  - Multichannel high-bandwidth coupling of ultradense silicon photonic waveguide array to standard-pitch fiber array
JO  - J. Lightwave Technol.
SP  - 475
EP  - 482
VL  - 29
IS  - 4
KW  - optical waveguides
KW  - from chiralphotonics
AB  - 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.
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=849), last updated on Sun, 22 May 2016 17:32:27 -0500
ID  - Lee_etal2011
ER  -