OSA's Digital Library

Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 2 — Jan. 27, 2014
  • pp: 2051–2059

Demonstration of a 3-dB directional coupler with enhanced robustness to gap variations for silicon wire waveguides

G. W. Cong, K. Suzuki, S. H. Kim, K. Tanizawa, S. Namiki, and H. Kawashima  »View Author Affiliations

Optics Express, Vol. 22, Issue 2, pp. 2051-2059 (2014)

View Full Text Article

Enhanced HTML    Acrobat PDF (3204 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



We demonstrate a robust 3-dB directional coupler which has a narrow silicon wire core and a wide gap. Sensitivity to the gap variation is decreased to one tenth that of a conventional directional coupler. Better spectral stability due to the enhanced robustness to waveguide geometrical fluctuations was experimentally verified.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.1360) Optical devices : Beam splitters
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

Original Manuscript: November 21, 2013
Revised Manuscript: January 13, 2014
Manuscript Accepted: January 14, 2014
Published: January 23, 2014

G. W. Cong, K. Suzuki, S. H. Kim, K. Tanizawa, S. Namiki, and H. Kawashima, "Demonstration of a 3-dB directional coupler with enhanced robustness to gap variations for silicon wire waveguides," Opt. Express 22, 2051-2059 (2014)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. K. Yamada, “Silicon photonic wire waveguides: fundamentals and applications,” in Silicon Photonics II. Topics in Applied Physics119, 1−29 (2011), D. J. Lockwood and L. Pavesi, eds. (Springer-Verlag Berlin Heidelberg, 2011).
  2. M. Gnan, S. Thoms, D. S. Macintyre, R. M. De La Rue, M. Sorel, “Fabrications of low-loss photonic wires in silicon-on-insulator using hydrogen silsesquioxane electron-beam resist,” Electron. Lett. 44(2), 115–116 (2008). [CrossRef]
  3. T. Shoji, K. Kintaka, S. Suda, H. Kawashima, T. Hasama, H. Ishikawa, “Low-crosstalk 2 x 2 thermo-optic switch with silicon wire waveguides,” Opt. Express 18(9), 9071–9075 (2010). [CrossRef] [PubMed]
  4. J. Van Campenhout, W. M. Green, Y. A. Vlasov, “Design of a digital, ultra-broadband electro-optic switch for reconfigurable optical networks-on-chip,” Opt. Express 17(26), 23793–23808 (2009). [CrossRef] [PubMed]
  5. K. Suzuki, K. Tanizawa, T. Matsukawa, G. W. Cong, S. H. Kim, S. Suda, M. Ohno, T. Chiba, H. Tadokoro, M. Yanagihara, Y. Igarashi, M. Masahara, and H. Kawashima, “Ultra-compact Si-wire 8×8 PILOSS Switch,” PD2.D.2, ECOC2013 (London, 2013).
  6. S. Nakamura, S. Takahashi, M. Sakauchi, T. Hino, M-B. Yu, and G-Q. Lo, “Wavelength selective switching with one chip silicon photonic circuit including 8×8 matrix switch,” OFC/NFOEC 2011, OTuM2.
  7. S. Sekiguchi, T. Kurahashi, L. Zhu, K. Kawaguchi, K. Morito, “Compact and low power operation optical switch using silicon-germanium/silicon hetero-structure waveguide,” Opt. Express 20(8), 8949–8958 (2012). [CrossRef] [PubMed]
  8. K. Voigt, L. Zimmermann, G. Winzer, and K. Petermann, “SOI based 2×2 and 4×4 waveguide couplers – evolution from DPSK to DQPSK,” The 5th IEEE International Conference on Group IV photonics, pp. 209–211 (2008).
  9. S. Selvaraja, L. Fernandez, M. Vanslembrouck, J.-L. Everaert, P. Dumon, J. Van Campenhout, W. Bogaerts, and P. Absil, “Si photonic device uniformity improvement using wafer-scale location specific processing,” IEEE Photonics Conference 2012, pp. 725−726 (2012). [CrossRef]
  10. J. Van Campenhout, W. M. Green, S. Assefa, Y. A. Vlasov, “Low-power, 2 x 2 silicon electro-optic switch with 110-nm bandwidth for broadband reconfigurable optical networks,” Opt. Express 17(26), 24020–24029 (2009). [CrossRef] [PubMed]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited