Fiber Optics and Optical Communication

Optical fibers with high-index-contrast dielectric thin films

[+] Author Affiliations
Erol Karadeniz, Philipp Kornreich

Syracuse University, Department of Electrical Engineering and Computer Science, 3-114 CST Building, Syracuse, New York 13244

Opt. Eng. 45(10), 105006 (October 12, 2006). doi:10.1117/1.2354484
History: Received October 01, 2005; Revised February 08, 2006; Accepted February 09, 2006; Published October 12, 2006
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The authors analyze electromagnetic wave propagation through optical fibers consisting of a glass core surrounded by a high-refractive-index dielectric thin film, in turn surrounded by a glass cladding. The asymmetry of the structure due to different core and cladding refractive indices results in two types of guided modes: they propagate either in the core and film or only in the film. The dispersion equations are derived, and mode classifications are established for transverse and hybrid modes. The cutoff conditions of transverse modes are given. Numerical simulations are performed to obtain the effects of film index and thickness on the cutoff frequencies and dispersion curves. It is shown that a high-index film causes the modes to become evanescent in the core and guided only in the film. These modes form two types of linearly polarized modes, according as they follow the TE or the TM mode propagation curves of asymmetric slab waveguide. Investigation of power flow along the propagation direction shows that the higher the refractive index of the film, the higher the power density in the film.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Erol Karadeniz and Philipp Kornreich
"Optical fibers with high-index-contrast dielectric thin films", Opt. Eng. 45(10), 105006 (October 12, 2006). ; http://dx.doi.org/10.1117/1.2354484


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