OSA's Digital Library

Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 21, Iss. 12 — Dec. 1, 2004
  • pp: 2095–2101

Coupling between two collinear air-core Bragg fibers

Maksim Skorobogatiy, Kunimasa Saitoh, and Masanori Koshiba  »View Author Affiliations

JOSA B, Vol. 21, Issue 12, pp. 2095-2101 (2004)

View Full Text Article

Acrobat PDF (491 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



We characterize coupling between two identical collinear hollow-core Bragg fibers, assuming a TE<sub>01</sub> launching condition. Using a multipole method and a finite-element method, we have investigated the dependence of the beat length between supermodes of the coupled fibers and supermode radiation losses as a function of the interfiber separation, the fiber core radius, and the index of the cladding. We established that coupling is maximal when the fibers are touching each other and decreases dramatically during the first hundreds of nanometers of separation. However, residual coupling with the strength proportional to the fiber radiation loss decreased over a long range as an inverse square root of the interfiber separation and exhibited periodic variation with interfiber separation. Finally, we considered coupling between the TE<sub>01</sub> modes with a view to designing a directional coupler. We found that for fibers with large enough core radii one can identify broad frequency ranges in which the intermodal coupling strength exceeds supermode radiation losses by 1 order of magnitude, thus opening the possibility of building a directional coupler. We attribute such unusually strong intermode coupling both to the resonant effects in the intermirror cavity and to proximity interaction between the leaky modes localized in the mirror.

© 2004 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2400) Fiber optics and optical communications : Fiber properties

Maksim Skorobogatiy, Kunimasa Saitoh, and Masanori Koshiba, "Coupling between two collinear air-core Bragg fibers," J. Opt. Soc. Am. B 21, 2095-2101 (2004)

Sort:  Author  |  Year  |  Journal  |  Reset


  1. C. M. Smith, N. Venkataraman, M. T. Gallagher, D. Muller, J. A. West, N. F. Borrelli, D. C. Allan, and K. W. Koch, “Low-loss hollow-core silica/air photonic bandgap fibre,” Nature (London) 424, 657–659 (2003).
  2. B. Temelkuran, S. D. Hart, G. Benoit, J. D. Joannopoulos, and Y. Fink, “Wavelength-scalable hollow optical fibres with large photonic bandgaps for CO2 laser transmission,” Nature (London) 420, 650–653 (2002).
  3. M. A. van Eijkelenborg, A. Argyros, G. Barton, I. M. Bassett, M. Fellew, G. Henry, N. A. Issa, M. C. J. Large, S. Manos, W. Padden, L. Poladian, and J. Zagari, “Recent progress in microstructured polymer optical fibre fabrication and characterisation,” Opt. Fiber Technol. 9, 199–209 (2003).
  4. B. H. Lee, J. B. Eom, J. Kim, D. S. Moon, U.-C. Paek, and G.-H. Yang, “Photonic crystal fiber coupler,” Opt. Lett. 27, 812–814 (2002).
  5. G. Kakarantzas, B. J. Mangan, T. A. Birks, J. C. Knight, and P. St. J. Russell, “Directional coupling in a twin core photonic crystal fiber using heat treatment,” in Conference on Lasers and Electro-Optics, Vol. 56 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2001), pp. 599–600.
  6. M. Kristensen, “Mode-coupling in photonic crystal fibers with multiple cores,” in Conference on Lasers and Electro-optics (Washington, D.C., 2000).
  7. B. J. Mangan, J. C. Knight, T. A. Birks, P. St. J. Russell, and A. H. Greenaway, “Experimental study of dualcore photonic crystal fibre,” Electron. Lett. 36, 1358–1359 (2000).
  8. K. Saitoh, Y. Sato, and M. Koshiba, “Coupling characteristics of dual-core photonic crystal fiber couplers,” Opt. Express 11, 3188–3195 (2003), http://www.opticsexpress.org.
  9. L. Zhang and C. Yang, “Polarization splitter based on photonic crystal fibers,” Opt. Express 11, 1015–1020 (2003), http://www.opticsexpress.org.
  10. K. Saitoh and M. Koshiba, “Full-vectorial imaginary-distance beam propagation method based on a finite element scheme: application to photonic crystal fibers,” IEEE J. Quantum Electron. 38, 927–933 (2002).
  11. F. Fogli, L. Saccomandi, P. Bassi, G. Bellanca, and S. Trillo, “Full vectorial BPM modeling of indexguiding photonic crystal fibers and couplers,” Opt. Express 10, 54–59 (2002), http://www.opticsexpress.org.
  12. S. G. Johnson, M. Ibanescu, M. Skorobogatiy, O. Weisberg, T. D. Engeness, M. Soljačić, S. A. Jacobs, J. D. Joannopoulos, and Y. Fink, “Low-loss asymptotically single-mode propagation in large-core OmniGuide fibers,” Opt. Express 9, 748–779 (2001), www.opticsexpress.org.
  13. T. P. White, B. T. Kuhlmey, R. C. McPhedran, D. Maystre, G. C. Martijn de Sterke, and L. C. Botten, “Multipole method for microstructured optical fibers. I. Formulation,” J. Opt. Soc. Am. B 19, 2322–2330 (2002).
  14. R. A. Minasian, K. E. Alameh, and E. H. W. Chan, “Photonics-based interference mitigation filters,” IEEE Trans. Microwave Theory Tech. 49, 1894–1899 (2001).
  15. P. Yeh, A. Yariv, and E. Marom, “Theory of Bragg fiber,” J. Opt. Soc. Am. 68, 1196–1201 (1978).

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