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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 29, Iss. 4 — Feb. 15, 2011
  • pp: 475–482

Multichannel High-Bandwidth Coupling of Ultradense Silicon Photonic Waveguide Array to Standard-Pitch Fiber Array

Fuad E. Doany, Benjamin G. Lee, Solomon Assefa, William M. J. Green, Min Yang, Clint L. Schow, Christopher V. Jahnes, Sheng Zhang, Jonathan Singer, Victor I. Kopp, Jeffrey A. Kash, and Yurii A. Vlasov

Journal of Lightwave Technology, Vol. 29, Issue 4, pp. 475-482 (2011)


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Abstract

A multichannel tapered coupler interfacing standard 250-$\mu$m-pitch low-numerical-aperture (NA) polarization-maintaining fiber arrays with ultradense 20-$\mu$m-pitch high-NA silicon waveguides is designed and fabricated. The coupler is based on an array of 12 dual-core glass waveguides on 250-$\mu$m pitch that are tapered to a 20-$\mu$m 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-$\mu$m 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 $\mu$m of chip edge, providing 160-Gb/s per-channel bandwidths.

© 2010 IEEE

Citation
Fuad E. Doany, Benjamin G. Lee, Solomon Assefa, William M. J. Green, Min Yang, Clint L. Schow, Christopher V. Jahnes, Sheng Zhang, Jonathan Singer, Victor I. Kopp, Jeffrey A. Kash, and Yurii A. Vlasov, "Multichannel High-Bandwidth Coupling of Ultradense Silicon Photonic Waveguide Array to Standard-Pitch Fiber Array," J. Lightwave Technol. 29, 475-482 (2011)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-29-4-475

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