Abstract

We present compact crossings for silicon-on-insulator photonic wires. The waveguides are broadened using a 3μm parabolic taper in each arm. By locally applying a lower index contrast using a double-etch technique, loss of confinement is reduced and 97.5% transmission (1.7dB) is achieved with only 40dB cross talk.

© 2007 Optical Society of America

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References

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W. Bogaerts, P. Dumon, D. Van Thourhout, D. Taillaert, P. Jaenen, J. Wouters, B. S. V. Wiaux, and R. Baets, IEEE J. Sel. Top. Quantum Electron. 12, 1394 (2006).
[CrossRef]

H. Chen and A. Poon, IEEE Photon. Technol. Lett. 18, 2260 (2006).
[CrossRef]

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T. Fukazawa, T. Hirano, F. Ohno, and T. Baba, Jpn. J. Appl. Phys., Part 1 43, 646 (2004).
[CrossRef]

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D. Taillaert, W. Bogaerts, P. Bienstman, T. Krauss, P. Van Daele, I. Moerman, S. Verstuyft, K. De Mesel, and R. Baets, IEEE J. Quantum Electron. 38, 949 (2002).
[CrossRef]

1998 (1)

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C. Wei, F. Groen, M. Smit, I. Moerman, P. Van Daele, and R. Baets, J. Lightwave Technol. 15, 906 (1997).
[CrossRef]

IEEE J. Quantum Electron. (1)

D. Taillaert, W. Bogaerts, P. Bienstman, T. Krauss, P. Van Daele, I. Moerman, S. Verstuyft, K. De Mesel, and R. Baets, IEEE J. Quantum Electron. 38, 949 (2002).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

W. Bogaerts, P. Dumon, D. Van Thourhout, D. Taillaert, P. Jaenen, J. Wouters, B. S. V. Wiaux, and R. Baets, IEEE J. Sel. Top. Quantum Electron. 12, 1394 (2006).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

H. Chen and A. Poon, IEEE Photon. Technol. Lett. 18, 2260 (2006).
[CrossRef]

J. Lightwave Technol. (2)

Jpn. J. Appl. Phys., Part 1 (1)

T. Fukazawa, T. Hirano, F. Ohno, and T. Baba, Jpn. J. Appl. Phys., Part 1 43, 646 (2004).
[CrossRef]

Opt. Lett. (1)

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Figures (4)

Fig. 1
Fig. 1

2-D simulations of waveguide crossings: (a) direct crossing, (b) twofold symmetric elliptical crossing [4] with a 6 μ m length, (c) elliptical crossing [4] with a 6 μ m length, (d) crossing from Fig. 1.

Fig. 2
Fig. 2

Waveguide crossing with a double etch.

Fig. 3
Fig. 3

Fabricated waveguide crossing.

Fig. 4
Fig. 4

Transmission measurements on multiple waveguide crossings: (a) transmission for 0, 5, 10, and 21 crossings. The parabolic spectrum is typical for grating fiber couplers [7]. (b) Fitted loss per crossing at 1550 nm .

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