Abstract

This paper reports modeling and simulation of low-loss coupling between polarization-insensitive silicon-on-insulator (SOI) microwaveguides and single-mode optical fiber, using a two-dimensional taper. The proposed structure is a reduction of both sizes of a square-strip waveguide from a 350 × 350-nm2 cross section to about 155 × 155-nm2 cross section. At the output facet, the guided mode is spread out and has a non-Gaussian profile,but low-loss coupling can be achieved by optimizing the overlap integral between the submicrometer waveguide mode and the optical fiber one. The calculated coupling losses are lower than 0.2 dB, the alignment tolerance is larger than 4 µm at ±1 dB for the coupling losses, and the total length is about 10 µm.

© 2003 IEEE

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Appl. Opt. (2)

A. Sv. Sudbø, "Improved formulation of the film mode matching method for mode field calculations in dielectric waveguides", Pure Appl. Opt., vol. 3, pp. 381-388, 1994.

D. Pascal, R. Orobtchouk, A. Layadi, A. Koster and S. Laval, "Optimized coupling of a gaussian beam into an optical waveguide with a grating coupler: Comparison of experimental and theoretical results", Appl. Opt., vol. 36, pp. 2443 -2447, 1997.

Opt. Lett. (1)

Other (6)

R. A. Soref and J. P. Lorenzo, "All silicon active and passive guided-wave components for ? =1.3µm and 1.6 µm", IEEE J. Quantum Electron., vol. QE-22, pp. 873-879, June 1986.

K. K. Lee, D. R. Lim, L. C. Kimerling, J. Shin and F. Cerrina, "Fabrication of ultra-low Si/SiO 2 waveguides by roughness reduction", Opt. Lett. , vol. 26, pp. 1888-1890, 2001.

L. Vivien, S. Laval, B. Dumont, S. Lardenois, A. Koster and E. Cassan, "Polarization-independent single-mode rib waveguides on silicon-on-insulator for telecommunication wavelengths", Opt. Commun. , vol. 210, pp. 43-49, 2002.

K. Kasaya, O. Mitomi, M. Naganuma, Y. Kondo and Y. Noguchi, "Simple laterally tapered waveguide for low-loss coupling to single-mode fibers", IEEE Photon. Technol. Lett., vol. 5, pp. 345-347, Mar. 1993.

D. Pascal, S. Lardenois, E. Cassan, A. Koster, S. Laval, M. Heitzmann, L. Mollard, B. Dal'Zoto, N. Bouzaida and R. Orobtchouk, "Efficient coupling into sub-micrometer rib and strip SOI waveguides", in Proc. TOPS 78, Integrated Photonic Res. , Vancouver, BC, Canada,July 17-20 2002,IBSN 1-55752-722-9.

M. B. Frish, J. A. Fijol, E. E. Fike, S. A. Jacobson, P. B. Keating, W. J. Kessler, C. Bozler, M. Fritze, C. Keast, J. Knecht, R. Williamson and C. Manolatou, "Coupling of single-mode fibers to planar Si waveguides using vertically tapered mode converters", in Integrated Photonics Res., 2002 Tech. Dig., Vancouver, BC, Canada, 2002, pp. IFB2-1- IFB2-3.

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