Abstract

One dominant issue for micro-resonator filters has been polarization sensitivity due to the form asymmetry in nanophotonic waveguides. Differences in the filter�??s transmission intensity for TE and TM polarizations is attributed to the polarization dependent coupling. Complete power transfer in ultra-small directional couplers is demonstrated in agreement with simulations. Polarization dependence is simulated for waveguides of various widths, showing the presence of a critical width at which the propagation constants are equal for TE and TM modes. A design for polarization-independent and single-mode waveguides is discussed, along with implications for the applications of micro-resonators in general.

© 2003 Optical Society of America

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IEEE J. Lightwave Technol. (1)

B. Little, G.S. T. Chi, H. Haus, J. Foresi, and J. P. Laine, �??Micro-ring resonator channel dropping filters,�?? IEEE J. Lightwave Technol. 15, 998 (1997).
[CrossRef]

IEEE J. Quantum Electron. (1)

R. A. Forber and E. Marom, �??Symmetric directional coupler switches,�?? IEEE J. Quantum Electron. QE-22, 911 (1986).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

M. K. Chin, C. Youtsey, W. Zhao, T. Pierson, Z. Ren, S. L. Wu, L. Wang, Y. G. Zhou, and S. T. Ho, �??GaAs microcavity channel-dropping filter based on a race-track resonator,�?? IEEE Photon. Technol. Lett. 11, 1620-1622 (1999).
[CrossRef]

Dominik G. Rabus, and Michael Hamacher, �??MMI-coupled ring resonators in GaInAsP-InP,�?? IEEE Photon. Technol. Lett. 13, 812-814 (2001).
[CrossRef]

J. Lightwave Technol. (2)

Other (2)

Optical Waveguide Mode Solver (OWMS), Apollo Photonics, Waterloo, Canada.

K. Okamoto, Fundamentals of Optical Waveguides, (Academic. Press, 2000) p. 238.

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