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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 26, Iss. 21 — Nov. 1, 2008
  • pp: 3528–3533

Coupled Waveguide Polarization Splitter With Slightly Different Core Widths

Tomohide Yamazaki, Hideaki Aono, Junji Yamauchi, and Hisamatsu Nakano

Journal of Lightwave Technology, Vol. 26, Issue 21, pp. 3528-3533 (2008)


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Abstract

A coupler-type transverse electric/transverse magnetic (TE/TM) polarization splitter, in which a metal-loaded core is slightly widened, is analyzed using the three-dimensional beam-propagation method. Before analyzing the splitter with the slightly different core widths, the performance of a splitter with two identical cores is evaluated. The use of the two identical cores results in a high crosstalk and a low extinction ratio due to the phase mismatch between the waveguides with and without the metal for the TE mode. Therefore, the core width in the metal-loaded waveguide is slightly widened so as to restore the phase-matching condition. In contrast to the conventional splitter with the two identical cores, the present splitter is found to offer a low crosstalk of less than $-$30 dB and a high extinction ratio of more than 30 dB with a coupling efficiency of more than 97% at a wavelength of 1.55 $\mu{\rm m}$. In addition, the wideband operation is demonstrated over a wavelength range of 1.50 to 1.61 $\mu{\rm m}$.

© 2008 IEEE

Citation
Tomohide Yamazaki, Hideaki Aono, Junji Yamauchi, and Hisamatsu Nakano, "Coupled Waveguide Polarization Splitter With Slightly Different Core Widths," J. Lightwave Technol. 26, 3528-3533 (2008)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-26-21-3528

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