Determination of the mode reflection coefficient in air-core photonic bandgap fibers

doi:10.1364/OE.15.005342

Optics Express

Editor: C. Martijin de Sterke
Vol. 15, Iss. 9 — Apr. 30, 2007
pp: 5342–5359

Determination of the mode reflection coefficient in air-core photonic bandgap fibers

Vinayak Dangui, Michel J. Digonnet, and Gordon S. Kino »View Author Affiliations

Optics Express, Vol. 15, Issue 9, pp. 5342-5359 (2007)
http://dx.doi.org/10.1364/OE.15.005342

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Abstract

Using an eigenmode decomposition technique, we numerically determine the backreflection coefficient of the modes of air-core photonic bandgap fibers for flat terminations. This coefficient is found to be very small for the fundamental air-guided mode, of the order of 10^-5 to 10^-6, in contrast with the surface and bulk modes, which exhibit significantly higher reflections, by about three to four orders of magnitude. For the Crystal Fibre HC-1550-2 fiber, we find a reflection coefficient of 1.9×10^-6 for an air termination, and approximately 3.3% for a silica termination. We also find that the Fresnel approximation is ill suited for the determination of the modal reflection coefficient, and instead propose a more accurate new formula based on an averaged modal index.

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(060.2310) Fiber optics and optical communications : Fiber optics
(120.5700) Instrumentation, measurement, and metrology : Reflection

ToC Category:
Photonic Crystal Fibers

History
Original Manuscript: August 16, 2006
Revised Manuscript: November 6, 2006
Manuscript Accepted: November 7, 2006
Published: April 18, 2007

Citation
Vinayak Dangui, Michel J. Digonnet, and Gordon S. Kino, "Determination of the mode reflection coefficient in air-core photonic bandgap fibers," Opt. Express 15, 5342-5359 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-9-5342

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References

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