Abstract

We report taper designs with high transmission efficiencies and with lengths shorter than those needed for adiabatic operation. The tapering occurs between rectangular optical waveguides with the same vertical silicon-on-insulator layer structure, but with different horizontal widths, namely 0.5 and 2.0 µm, and for taper lengths between 0.5 and 3.0 µm. After a comparison between two different optimization methods in a two-dimensional calculation scheme, one of these is repeated using three-dimensional calculations. The results show that, also in the length region where conventional linear and parabolic tapers are not yet adiabatic, tapers with a high efficiency can be designed by applying complex taper structures with more degrees of freedom.

© 2005 IEEE

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  1. D. Marcuse, "Radiation losses of tapered dielectric slab waveguides", Bell Syst. Tech. J., vol. 49, no. 2, pp. 273-290, 1970.
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  3. A. F. Milton and C. K. Burns, "Mode coupling in optical waveguide horns", IEEE J. Quantum Electron., vol. 13, no. 10, pp. 828-835, Oct. 1977.
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  5. D. Taillaert, P. Bienstman and R. Baets, "Compact efficient broadband grating coupler for silicon-on-insulator waveguides", Opt. Lett., vol. 29, no. 23, pp. 2749-2751, 2004.
  6. M. M. Spühler, B. J. Offrein, G. L. Bona, R. Germann, I. Masserek and D. Erni, "A very short planar silica spot-size converter using a nonperiodic segmented waveguide", J. Lightw. Technol., vol. 16, no. 9, pp. 1680-1685, Sep. 1998.
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  8. T. Felici and H. W. Engl, "On shape optimization of optical waveguides using inverse problem techniques", Inverse Probl., vol. 17, no. 4, pp. 1141-1162, 2001.
  9. T. Yabu, M. Geshiro and S. Sawa, "New design method for low-loss Y-branch waveguides", J. Lightw. Technol., vol. 19, no. 9, pp. 1376-1384, Sep. 2001.
  10. B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. Van Thourhout, V. Wiaux, S. Beckx and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator", IEEE Photon. Technol. Lett., vol. 17, no. 1, pp. 73-75, Jan. 2005.
  11. P. Bienstman and R. Baets, "Optical modelling of photonic crystals and VCSELs using eigenmode expansion and perfectly matched layers", Opt. Quantum Electron., vol. 33, no. 4-5, pp. 327-341, 2001.

Other

D. Marcuse, "Radiation losses of tapered dielectric slab waveguides", Bell Syst. Tech. J., vol. 49, no. 2, pp. 273-290, 1970.

C. K. Burns, A. F. Milton and A. B. Lee, "Optical-waveguide parabolic coupling horns", Appl. Phys. Lett., vol. 30, no. 1, pp. 28-30, 1977.

A. F. Milton and C. K. Burns, "Mode coupling in optical waveguide horns", IEEE J. Quantum Electron., vol. 13, no. 10, pp. 828-835, Oct. 1977.

K. Kato and Y. Tohmori, "PLC hybrid integration technology and its application to photonic components", IEEE J. Sel. Top. Quantum Electron., vol. 6, no. 1, pp. 4-13, Jan.-Feb. 2000.

D. Taillaert, P. Bienstman and R. Baets, "Compact efficient broadband grating coupler for silicon-on-insulator waveguides", Opt. Lett., vol. 29, no. 23, pp. 2749-2751, 2004.

M. M. Spühler, B. J. Offrein, G. L. Bona, R. Germann, I. Masserek and D. Erni, "A very short planar silica spot-size converter using a nonperiodic segmented waveguide", J. Lightw. Technol., vol. 16, no. 9, pp. 1680-1685, Sep. 1998.

M. M. Spühler, D. Erni and J. Fröhlich, "An evolutionary optimization procedure applied to the synthesis of integrated spot-size converters", Opt. Quantum Electron., vol. 30, no. 5-6, pp. 305-321, 1998.

T. Felici and H. W. Engl, "On shape optimization of optical waveguides using inverse problem techniques", Inverse Probl., vol. 17, no. 4, pp. 1141-1162, 2001.

T. Yabu, M. Geshiro and S. Sawa, "New design method for low-loss Y-branch waveguides", J. Lightw. Technol., vol. 19, no. 9, pp. 1376-1384, Sep. 2001.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. Van Thourhout, V. Wiaux, S. Beckx and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator", IEEE Photon. Technol. Lett., vol. 17, no. 1, pp. 73-75, Jan. 2005.

P. Bienstman and R. Baets, "Optical modelling of photonic crystals and VCSELs using eigenmode expansion and perfectly matched layers", Opt. Quantum Electron., vol. 33, no. 4-5, pp. 327-341, 2001.

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