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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 26, Iss. 12 — Jun. 15, 2008
  • pp: 1708–1714

A Short Polarization Converter Using a Triangular Waveguide

Junji Yamauchi, Masahiro Yamanoue, and Hisamatsu Nakano

Journal of Lightwave Technology, Vol. 26, Issue 12, pp. 1708-1714 (2008)


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Abstract

A novel polarization converter using a triangular waveguide is proposed and analyzed by the imaginary-distance beam-propagation method based on Yee's mesh and the finite-difference time-domain method. The polarization conversion length is investigated as a function of relative refractive index difference. It is found, for a silicon core embedded in a silica cladding, that the conversion length is 2 $\mu$m, while the insertion loss is 0.5 dB at a wavelength of 1.55 $\mu$m. The extinction ratio is more than 20 dB over a wide wavelength range of 1.25 to 1.65 $\mu$m. Using a geometrically expanded model, the polarization conversion behavior is verified in the experiment at a microwave frequency of 15 GHz. Finally, reasonable polarization conversion is obtained with a modified structure, in which the two corners of the triangular waveguide are cut and the cut plane is aligned with a square input (output) waveguide.

© 2008 IEEE

Citation
Junji Yamauchi, Masahiro Yamanoue, and Hisamatsu Nakano, "A Short Polarization Converter Using a Triangular Waveguide," J. Lightwave Technol. 26, 1708-1714 (2008)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-26-12-1708

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