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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 10 — May. 15, 2009
  • pp: 1315–1319

A Two-Port Single-Mode Fiber–Silicon Wire Waveguide Coupler Module Using Spot-Size Converters

Hidehiko Yoda, Kazuo Shiraishi, Akihiko Ohshima, Tomohiro Ishimura, Hiroshi Furuhashi, Haruhiko Tsuchiya, and Chen S. Tsai

Journal of Lightwave Technology, Vol. 27, Issue 10, pp. 1315-1319 (2009)


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Abstract

In this paper, the performance of a two-port single-mode fiber–silicon wire waveguide coupler module which utilizes an identical spot-size converter (SSC) at the input and output ports is reported. Each of the silicon (Si)-based SSCs comprised cascaded horizontal linear and vertical nonlinear up-tapers measured 300 and 200 $\mu$m in length, respectively, in a common silicon-on-insulator (SOI) substrate. The structural parameters of the tapers were designed for compactness and relaxed tolerance to fabrication errors. The total length of the two-port coupler module was 1000 $\mu$m plus the variable length of the wire waveguide connecting the two SSCs. The mode-field diameter (MFD) of the Si-wire waveguide, 0.32$\,\times\,$0.46 $\mu$m$^{2}$, was transformed to the diameter of 2.8$\,\times\,$8.0 $\mu$m$^{2}$ at the wavelength of 1.55 $\mu$m (corresponding to an area expansion of about 150 times) and vice versa by the SSCs with a net transmission loss of 4.1 dB/port. The field-mismatch loss between the SSC and the single-mode fiber with the MFD of 5.2 $\mu$m was 2.1 dB/port.

© 2009 IEEE

Citation
Hidehiko Yoda, Kazuo Shiraishi, Akihiko Ohshima, Tomohiro Ishimura, Hiroshi Furuhashi, Haruhiko Tsuchiya, and Chen S. Tsai, "A Two-Port Single-Mode Fiber–Silicon Wire Waveguide Coupler Module Using Spot-Size Converters," J. Lightwave Technol. 27, 1315-1319 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-10-1315


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