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

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2007 (2)

T. Barwicz, M. R. Watts, M. A. Popović, P. T. Rakich, L. Socci, F. X. Kärtner, E. P. Ippen, H. I. Smith, "Polarization-transparent microphotonic devices in the strong confinement limit," Nature Photon. 1, 57-60 (2007).

L. M. Augustin, J. J. G. M. van der Tol, E. J. Geluk, M. K. Smit, "Short polarization converter optimized for active-passive integration in InGaAsP-InP," IEEE Photon. Technol. Lett. 19, 1673-1675 (2007).

2005 (2)

H. Deng, D. O. Yevick, C. Brooks, P. E. Jessop, "Design rules for slanted-angle polarization rotators," J. Lightw. Technol. 23, 432-445 (2005).

M. R. Watts, H. A. Haus, "Integrated mode-evolution-based polarization rotators," Opt. Lett. 30, 138-140 (2005).

2003 (1)

D. Correia, J. P. da Silva, H. E. Hernández-Figueroa, "Genetic algorithm and finite-element design of short single-section passive polarization converter," IEEE Photon. Technol. Lett. 15, 915-917 (2003).

2002 (1)

T. Ando, T. Murata, H. Nakayama, J. Yamauchi, H. Nakano, "Analysis and measurement of polarization conversion in a periodically loaded dielectric waveguide," IEEE Photon. Technol. Lett. 14, 1288-1290 (2002).

2001 (1)

B. M. A. Rahman, S. S. A. Obayya, N. Somasiri, M. Rajarajan, K. T. V. Grattan, H. A. El-Mikathi, "Design and characterization of compact single-section passive polarization rotator," J. Lightw. Technol. 19, 512-519 (2001).

2000 (1)

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

1996 (2)

V. P. Tzolov, M. Fontaine, "A passive polarization converter free of longitudinally-periodic structure," Opt. Commun. 127, 7-13 (1996).

S. M. Lee, "Finite-difference vectorial-beam-propagation method using Yee's discretization scheme for modal fields," J. Opt. Soc. Amer. A 13, 1369-1377 (1996).

1991 (2)

Y. Shani, R. Alferness, T. Koch, U. Koren, M. Oron, B. I. Miller, M. G. Young, "Polarization rotation in asymmetric periodic loaded rib waveguides," Apply. Phys. Lett. 59, 1278-1280 (1991).

G. R. Hadley, "Transparent boundary condition for beam propagation," Opt. Lett. 16, 624-626 (1991).

1984 (1)

1977 (1)

C. Vassallo, "On a rigorous calculation of the efficiency for coupling light power into optical waveguides," IEEE J. Quantum Electron. QE-13, 165-173 (1977).

1970 (1)

D. Marcuse, "Excitation of the dominant mode of a round fiber by a Gaussian beam," Bell Syst. Tech. J. 49, 1695-1703 (1970).

Appl. Opt. (1)

Apply. Phys. Lett. (1)

Y. Shani, R. Alferness, T. Koch, U. Koren, M. Oron, B. I. Miller, M. G. Young, "Polarization rotation in asymmetric periodic loaded rib waveguides," Apply. Phys. Lett. 59, 1278-1280 (1991).

Bell Syst. Tech. J. (1)

D. Marcuse, "Excitation of the dominant mode of a round fiber by a Gaussian beam," Bell Syst. Tech. J. 49, 1695-1703 (1970).

IEEE Photon. Technol. Lett. (1)

L. M. Augustin, J. J. G. M. van der Tol, E. J. Geluk, M. K. Smit, "Short polarization converter optimized for active-passive integration in InGaAsP-InP," IEEE Photon. Technol. Lett. 19, 1673-1675 (2007).

IEEE J. Quantum Electron. (1)

C. Vassallo, "On a rigorous calculation of the efficiency for coupling light power into optical waveguides," IEEE J. Quantum Electron. QE-13, 165-173 (1977).

IEEE Photon. Technol. Lett. (1)

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

IEEE Photon. Technol. Lett. (2)

D. Correia, J. P. da Silva, H. E. Hernández-Figueroa, "Genetic algorithm and finite-element design of short single-section passive polarization converter," IEEE Photon. Technol. Lett. 15, 915-917 (2003).

T. Ando, T. Murata, H. Nakayama, J. Yamauchi, H. Nakano, "Analysis and measurement of polarization conversion in a periodically loaded dielectric waveguide," IEEE Photon. Technol. Lett. 14, 1288-1290 (2002).

J. Lightw. Technol. (1)

H. Deng, D. O. Yevick, C. Brooks, P. E. Jessop, "Design rules for slanted-angle polarization rotators," J. Lightw. Technol. 23, 432-445 (2005).

J. Opt. Soc. Amer. A (1)

S. M. Lee, "Finite-difference vectorial-beam-propagation method using Yee's discretization scheme for modal fields," J. Opt. Soc. Amer. A 13, 1369-1377 (1996).

J. Lightw. Technol. (1)

B. M. A. Rahman, S. S. A. Obayya, N. Somasiri, M. Rajarajan, K. T. V. Grattan, H. A. El-Mikathi, "Design and characterization of compact single-section passive polarization rotator," J. Lightw. Technol. 19, 512-519 (2001).

Nature Photon. (1)

T. Barwicz, M. R. Watts, M. A. Popović, P. T. Rakich, L. Socci, F. X. Kärtner, E. P. Ippen, H. I. Smith, "Polarization-transparent microphotonic devices in the strong confinement limit," Nature Photon. 1, 57-60 (2007).

Opt. Commun. (1)

V. P. Tzolov, M. Fontaine, "A passive polarization converter free of longitudinally-periodic structure," Opt. Commun. 127, 7-13 (1996).

Opt. Lett. (2)

Other (4)

Handbook of Optical Constants of Solids (Academic, 1985) pp. 547-569.

H. Fukuda, K. Yamada, T. Tsuchizawa, T. Watanabe, S. Itabashi, "Ultrasmall and wideband polarization rotator based on silicon wire waveguides," Integ. Photon. Nanophoton. Res. Appl. (2007).

J. Yamauchi, M. Yamanoue, H. Nakano, "An extremely short polarization converter using a triangular waveguide," Integ. Photon. Nanophoton. Res. Appl. (2007).

J. Yamauchi, I. Ohba, T. Ando, H. Nakano, "FDTD analysis of a polarization conversion waveguide with a single sloped sidewall," Integ. Photon. Res. (2003) pp. 198-200.

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