Abstract

The singlemode Si-photonic wire waveguide allows sharp bends,which significantly expands the design flexibility of optical devices and circuits. Here, the suppression of the polarization crosstalk at a sharp bend will be an important issue, since a large crosstalk affects the performance of devices and circuits. In this study, the three-dimensional (3-D) finite-difference time-domain (FDTD) simulation showed that the crosstalk at a 90°-bend with a radius of 0.35-1.75 µm is less than -25 dB at a wavelength of 1.55 µm. In the experiment,the crosstalk from TE-like to TM-like polarization was evaluated to be -13 dB to -10 dB. This large value was explained by a small tilt of waveguide sidewalls, which seriously increased the crosstalk. In addition, it was found in the calculation that some combinations of bends increase or decrease the crosstalk, and that a U-shape bend is the most effective for the suppression of the crosstalk.

© 2004 IEEE

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  1. K. K. Lee, D. R. Lim, H.-C. Luan, A. Agarwal, J. Foresi and L. C. Kimerling, "Effect of size and roughness on light transmission in Si/SiO2 waveguide: Experiments and model", Appl. Phys. Lett., vol. 77, pp. 1617-1619, 2000.
  2. A. Sakai, G. Hara and T. Baba, "Propagation characteristics of ultrahigh-Delta; optical waveguide on silicon-on-insulator substrate", Jpn. J. Appl. Phys., vol. 40, pp. L383-L385, 2001.
  3. A. Sakai, T. Fukazawa and T. Baba, "Low loss ultra-small branches in a silicon photonic wire waveguide", IEICE Trans. Electron., vol. E85-C, pp. 1033-1038, 2002 .
  4. T. Fukazawa, A. Sakai and T. Baba, "H-tree-type optical clock signal distribution circuit by a Si photonic wire waveguide", Jpn. J. Appl. Phys., vol. 41, pp. L1461-L1463, 2002.
  5. C. van Dam, L. H. Spiekman, F. P. G. M. van Ham, F. H Groen, J. J. G. M. van der Tol, I. Moerman, W. W. Pascher, M. Hamacher, H. Heidrich, C. M. Weinert and M. K. Smit, "Novel compact polarization converters based on ultra short bend", IEEE Photon. Technol. Lett., vol. 8, pp. 1346-1348, 1996.
  6. S. S. A. Obayya, B. M. A. Rahman, K. T. V. Grattan and H. A. El-Mikati, "Beam propagation modeling of polarization rotation in deeply etched semiconductor bend waveguides", IEEE Photon. Technol. Lett., vol. 13, pp. 681-683, 2001.
  7. J. J. G. M. van der Tol, F. Hakimzadeh, J. W. Pedersen, D. Li and H. van Brug, "A new short and low-loss polarization converter on InP", IEEE Photon. Technol. Lett., vol. 7, pp. 32-34, 1995 .
  8. J. Z. Huang, R. Scarmozzino, G. Nagy, M. J. Steel and R. M. Osgood Jr., "Realization of a compact and single-mode optical passive polarization converter", IEEE Photon. Technol. Lett., vol. 12, pp. 317-319, 2000.
  9. T. Tsuchizawa, T. Watanabe, E. Tamechika, T. Shoji, K. Yamada, J. Takahashi, S. Uchiyama, S. Itabashi and H. Morita, "Fabrication and evaluation of submicron-square Si wire waveguides with spot-size converters", in IEEE LEOS Annu. Meeting, Glasgow, U.K., 2002, p. 287.
  10. W. W. Lui, T. Hirono, K. Yokoyama and W.-P. Huang, "Polarization rotation in semiconductor bending waveguide: A coupled-mode theory formulation", J. Lightwave Technol. , vol. 16, pp. 929-936, 1998.
  11. T. Baba, A. Motegi, T. Iwai, N. Fukaya, Y. Watanabe and A. Sakai, "Light propagation characteristics of straight single-line-defect waveguides in photonic crystal slabs fabricated into a silicon-on-insulator substrate", IEEE J. Quantum Electron., vol. 38, pp. 743-752, 2002.

Other (11)

K. K. Lee, D. R. Lim, H.-C. Luan, A. Agarwal, J. Foresi and L. C. Kimerling, "Effect of size and roughness on light transmission in Si/SiO2 waveguide: Experiments and model", Appl. Phys. Lett., vol. 77, pp. 1617-1619, 2000.

A. Sakai, G. Hara and T. Baba, "Propagation characteristics of ultrahigh-Delta; optical waveguide on silicon-on-insulator substrate", Jpn. J. Appl. Phys., vol. 40, pp. L383-L385, 2001.

A. Sakai, T. Fukazawa and T. Baba, "Low loss ultra-small branches in a silicon photonic wire waveguide", IEICE Trans. Electron., vol. E85-C, pp. 1033-1038, 2002 .

T. Fukazawa, A. Sakai and T. Baba, "H-tree-type optical clock signal distribution circuit by a Si photonic wire waveguide", Jpn. J. Appl. Phys., vol. 41, pp. L1461-L1463, 2002.

C. van Dam, L. H. Spiekman, F. P. G. M. van Ham, F. H Groen, J. J. G. M. van der Tol, I. Moerman, W. W. Pascher, M. Hamacher, H. Heidrich, C. M. Weinert and M. K. Smit, "Novel compact polarization converters based on ultra short bend", IEEE Photon. Technol. Lett., vol. 8, pp. 1346-1348, 1996.

S. S. A. Obayya, B. M. A. Rahman, K. T. V. Grattan and H. A. El-Mikati, "Beam propagation modeling of polarization rotation in deeply etched semiconductor bend waveguides", IEEE Photon. Technol. Lett., vol. 13, pp. 681-683, 2001.

J. J. G. M. van der Tol, F. Hakimzadeh, J. W. Pedersen, D. Li and H. van Brug, "A new short and low-loss polarization converter on InP", IEEE Photon. Technol. Lett., vol. 7, pp. 32-34, 1995 .

J. Z. Huang, R. Scarmozzino, G. Nagy, M. J. Steel and R. M. Osgood Jr., "Realization of a compact and single-mode optical passive polarization converter", IEEE Photon. Technol. Lett., vol. 12, pp. 317-319, 2000.

T. Tsuchizawa, T. Watanabe, E. Tamechika, T. Shoji, K. Yamada, J. Takahashi, S. Uchiyama, S. Itabashi and H. Morita, "Fabrication and evaluation of submicron-square Si wire waveguides with spot-size converters", in IEEE LEOS Annu. Meeting, Glasgow, U.K., 2002, p. 287.

W. W. Lui, T. Hirono, K. Yokoyama and W.-P. Huang, "Polarization rotation in semiconductor bending waveguide: A coupled-mode theory formulation", J. Lightwave Technol. , vol. 16, pp. 929-936, 1998.

T. Baba, A. Motegi, T. Iwai, N. Fukaya, Y. Watanabe and A. Sakai, "Light propagation characteristics of straight single-line-defect waveguides in photonic crystal slabs fabricated into a silicon-on-insulator substrate", IEEE J. Quantum Electron., vol. 38, pp. 743-752, 2002.

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