We have developed a coupled-mode theory to describe light propagation in triple-core photonic crystal fibers (PCFs) in the nonlinear regime. The propagation equations including nonlinearities have been solved analytically. The nonlinear coupling for symmetric and asymmetric fibers is modeled for different coupling and nonlinear parameters. We investigate nonlinear inter-core coupling experimentally with a single high intensity pump beam. Optical switching of a signal beam in the presence of a control pump beam at a different wavelength is also demonstrated. The self-phase modulation (SPM) parameter γ in the triple-core PCF studied is determined.

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IEEE J. Quantum Electron.

• S. M. Jensen, “The nonlinear coherent coupler,” IEEE J. Quantum Electron. 18(10), 1580–1583 (1982). [CrossRef]

IEEE Photon. Technol. Lett.

• A. I. Siahlo, L. K. Oxenlowe, K. S. Berg, A. T. Clausen, P. A. Anderson, C. Peucheret, A. Tersigni, P. Jeppesen, K. P. Hansen, and J. R. Folkenberg, “A high-speed demultiplexer based on a nonlinear optical loop mirror with a photonic crystal fiber,” IEEE Photon. Technol. Lett. 15(8), 1147–1149 (2003). [CrossRef]

J. Opt. Soc. Am. B

• P. Miller, J. S. Aitchison, J. U. Kang, G. I. Stegeman, A. Villeneuve, G. T. Kennedy, and W. Sibbett, “Nonlinear waveguide arrays in AlGaAs,” J. Opt. Soc. Am. B 14, 11 (1997).
• Y. Yan, J. Toulouse, I. Velchev, and S. V. Rotkin, “Decoupling and asymmetric coupling in triple-core photonic crystal fibers,” J. Opt. Soc. Am. B 25(9), 1488 (2008). [CrossRef]

Opt. Commun.

• I. D. Chremmos, G. Kakarantzas, and N. K. Uzunoglu, “Modeling of a highly nonlinear chalcogenide dual-core photonic crystal fiber coupler,” Opt. Commun. 251(4-6), 339–345 (2005). [CrossRef]

Opt. Lett.

• A. Betlej, S. Suntsov, K. G. Makris, L. Jankovic, D. N. Christodoulides, G. I. Stegeman, J. Fini, R. T. Bise, and D. J. Digiovanni, “All-optical switching and multifrequency generation in a dual-core photonic crystal fiber,” Opt. Lett. 31(10), 1480–1482 (2006). [CrossRef] [PubMed]

Other

• G. P. Agrawal, Applications of Nonlinear Fiber Optics (Academic, 2001).
• G. P. Agrawal, Nonlinear Fiber Optics (Academic, 1995).
• R. Jiang, R. Saperstein, N. Alic, M. Nezhad, C. McKinstrie, J. Ford, Y. Fainman, and S. Radic, “375THz parametric translation of modulated signal from 1550nm to visible band,” OFC, PDP16, (2006).

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