Abstract

A double-tip coupler that comprises two inversely and laterally tapered waveguides is experimentally demonstrated for efficient light coupling between a fiber and a sub-micron silicon nitride waveguide. The coupling efficiency of the fabricated double-tip coupler can be improved by as much as over 2 dB per coupling facet, compared with that of a single-tip one with the same tip width of 180 nm. The effect of the gap width of the double tips on the coupling efficiency is studied both in experiment and simulation.

© 2008 Optical Society of America

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  1. D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
    [CrossRef]
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    [CrossRef] [PubMed]
  3. G. Masanovic, G. Reed, W. Headley, B. Timotijevic, V. Passaro, R. Atta, G. Ensell, and A. Evans, "A high efficiency input/output coupler for small silicon photonic devices," Opt. Express 13, 7374-7379 (2005) http://www.opticsinfobase.org/abstract.cfm?URI=oe-13-19-7374
    [CrossRef] [PubMed]
  4. Z. Lu, "Efficient fiber-to-waveguide coupling through the vertical leakage from a microring," Opt. Lett. 32, 2861-2863 (2007).
    [CrossRef] [PubMed]
  5. T. Dillon, J. Murakowski, S. Shi, and D. Prather, "Fiber-to-waveguide coupler based on the parabolic reflector," Opt. Lett. 33, 896-898 (2008).
    [CrossRef] [PubMed]
  6. H. Li, Z. Cao, H. Lu, and Q. Shen, "Free-space coupling of a light beam into a symmetrical metal-cladding optical waveguide," Appl. Phys. Lett. 83, 2757 (2003).
    [CrossRef]
  7. Z. Lu and D. W. Prather, "Total internal reflection-evanescent coupler for fiber-to-waveguide integration of planar optoelectric devices," Opt. Lett. 29, 1748-1750 (2004).
    [CrossRef] [PubMed]
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  9. T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 μm square Si wire waveguides to single mode fibres," Electron. Lett. 38, 1669-1670 (2002).
    [CrossRef]
  10. V. R. Almelda, R. R. Panepuccl, and M. Lipson, "Nanotaper for compact mode conversion," Opt. Lett. 28, 1302-1304 (2003).
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    [CrossRef]
  12. K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
    [CrossRef]
  13. B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
    [CrossRef]
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    [CrossRef]
  15. G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
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    [CrossRef] [PubMed]

2008

2007

Z. Lu, "Efficient fiber-to-waveguide coupling through the vertical leakage from a microring," Opt. Lett. 32, 2861-2863 (2007).
[CrossRef] [PubMed]

K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
[CrossRef]

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Y. Liu and J. Yu, "Low-loss coupler between fiber and waveguide based on silicon-on-insulator slot waveguides," Appl. Opt. 46, 7858-7861 (2007).
[CrossRef] [PubMed]

2006

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

2005

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
[CrossRef]

G. Masanovic, G. Reed, W. Headley, B. Timotijevic, V. Passaro, R. Atta, G. Ensell, and A. Evans, "A high efficiency input/output coupler for small silicon photonic devices," Opt. Express 13, 7374-7379 (2005) http://www.opticsinfobase.org/abstract.cfm?URI=oe-13-19-7374
[CrossRef] [PubMed]

2004

2003

2002

T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 μm square Si wire waveguides to single mode fibres," Electron. Lett. 38, 1669-1670 (2002).
[CrossRef]

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Agarwal, A.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Almelda, V. R.

Atta, R.

Baets, R.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
[CrossRef]

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Beckx, S.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

Bienstman, P.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Bogaerts, W.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
[CrossRef]

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Cao, Z.

H. Li, Z. Cao, H. Lu, and Q. Shen, "Free-space coupling of a light beam into a symmetrical metal-cladding optical waveguide," Appl. Phys. Lett. 83, 2757 (2003).
[CrossRef]

Cheben, P.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Chen, H.

K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
[CrossRef]

Daele, P. V.

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Delâge, A.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Densmore, A.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Dillon, T.

Dumon, P.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
[CrossRef]

Ensell, G.

Evans, A.

Headley, W.

Hong, C. Y.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Ikedo, H.

K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
[CrossRef]

Janz, S.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Jiang, J.

Kimerling, L. C.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Krauss, T. F.

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Lamontagne, B.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Lapointe, J.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Li, H.

H. Li, Z. Cao, H. Lu, and Q. Shen, "Free-space coupling of a light beam into a symmetrical metal-cladding optical waveguide," Appl. Phys. Lett. 83, 2757 (2003).
[CrossRef]

Lin, C.

Lipson, M.

Liu, Y.

Lu, H.

H. Li, Z. Cao, H. Lu, and Q. Shen, "Free-space coupling of a light beam into a symmetrical metal-cladding optical waveguide," Appl. Phys. Lett. 83, 2757 (2003).
[CrossRef]

Lu, Z.

Luyssaert, B.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

Manolatou, C.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Masanovic, G.

Mesel, K. D.

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Michel, J.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Moerman, I.

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Montalbo, T.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Morita, H.

T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 μm square Si wire waveguides to single mode fibres," Electron. Lett. 38, 1669-1670 (2002).
[CrossRef]

Murakowski, J.

Nguyen, V.

V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
[CrossRef]

Nordin, G.

Ohshima, A.

K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
[CrossRef]

Panepuccl, R. R.

Passaro, V.

Post, E.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Prather, D.

Prather, D. W.

Pustai, D.

Reed, G.

Roelkens, G.

G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
[CrossRef]

Schmid, J. H.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

Shen, Q.

H. Li, Z. Cao, H. Lu, and Q. Shen, "Free-space coupling of a light beam into a symmetrical metal-cladding optical waveguide," Appl. Phys. Lett. 83, 2757 (2003).
[CrossRef]

Shi, S.

Shiraishi, K.

K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
[CrossRef]

Shoji, T.

T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 μm square Si wire waveguides to single mode fibres," Electron. Lett. 38, 1669-1670 (2002).
[CrossRef]

Sure, A.

Taillaert, D.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Thourhout, D. V.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

Timotijevic, B.

Tsuchizawa, T.

T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 μm square Si wire waveguides to single mode fibres," Electron. Lett. 38, 1669-1670 (2002).
[CrossRef]

Van Thourhout, D.

G. Roelkens, P. Dumon, W. Bogaerts, D. Van Thourhout, and R. Baets, "Efficient silicon-on-insulator fiber coupler fabricated using 248-nm-deep UV lithography," IEEE Photon. Technol. Lett. 17, 2613-1615 (2005).
[CrossRef]

Vandersteegen, P.

B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

Verstuyft, S.

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

Waldron, P.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

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[CrossRef]

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B. Luyssaert, P. Vandersteegen, D. Taillaert, P. Dumon, W. Bogaerts, P. Bienstman, D. V. Thourhout, V. Wiaux, S. Beckx, and R. Baets, "A compact photonic horizontal spot-size converter realized in silicon-on-insulator," IEEE Photon. Technol. Lett. 17, 73-75 (2005).
[CrossRef]

Xu, D.-X.

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
[CrossRef]

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T. Shoji, T. Tsuchizawa, T. Watanabe, K. Yamada, and H. Morita, "Low loss mode size converter from 0.3 μm square Si wire waveguides to single mode fibres," Electron. Lett. 38, 1669-1670 (2002).
[CrossRef]

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V. Nguyen, T. Montalbo, C. Manolatou, A. Agarwal, C. Y. Hong, J. Yasaitis, L. C. Kimerling, and J. Michel, "Silicon-based highly-efficient fiber-to-waveguide coupler for high index contrast systems," Appl. Phys. Lett. 88, 081112 (2006).
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[CrossRef]

K. Shiraishi, H. Yoda, A. Ohshima, H. Ikedo, and C. S. Tsai, "A silicon-based spot-size converter between single-mode fibers and Si-wire waveguides using cascaded tapers," Appl. Phys. Lett. 91, 141120 (2007).
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[CrossRef]

IEEE J. Quantum Electron.

D. Taillaert, W. Bogaerts, P. Bienstman, T. F. Krauss, P. V. Daele, I. Moerman, S. Verstuyft, K. D. Mesel, and R. Baets, "An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers," IEEE J. Quantum Electron. 38, 949-955 (2002).
[CrossRef]

IEEE Photon. Technol. Lett.

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[CrossRef]

J. H. Schmid, B. Lamontagne, P. Cheben, A. Delâge, S. Janz, A. Densmore, J. Lapointe, E. Post, P. Waldron, and D.-X. Xu, "Mode Converters for Coupling to High Aspect Ratio Silicon-on-Insulator Channel waveguides," IEEE Photon. Technol. Lett. 19, 855-857 (2007).
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Figures (5)

Fig. 1.
Fig. 1.

(a). Top-view and (b) cross-section of a schematic double-tip coupler.

Fig. 2.
Fig. 2.

(a). Double tips of a double-tip coupler; (b) the combined region of the double-tip coupler; (c) the tip of a single-tip coupler.

Fig. 3.
Fig. 3.

(a). Transmission spectra (from top to bottom) for the double-tip couplers with gap widths of 600 nm, 500 nm, 800 nm, and 900 nm, and for the single-tip coupler, respectively. The waveguide width is 700 nm and the tip width is 180 nm.

Fig. 4.
Fig. 4.

Transmission spectra (from top to bottom) for the double-tip couplers with gap widths 600 nm, 500 nm, 900 nm, and 800 nm, and for the single-tip coupler, respectively. The waveguide width is 400 nm and the tip width is 180 nm.

Fig. 5.
Fig. 5.

Simulated coupling efficiencies for the double-tip couplers with varying gap widths (solid lines) and coupling efficiencies for the corresponding single-tip couplers (dashed lines).

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