The radiated power emanating from a bent single-mode fiber is computed for various radii of curvature by a full-vectorial analysis. The only approximation is the truncation of a spectral series, the accuracy of which can be controlled. Hence, the complex propagation coefficient of the fundamental mode approaches the exact value and consequently, the bending loss does as well. Two widely accepted bending-loss formulas, based on asymptotic approximations to scalar-field theory, are compared with our full-vectorial results. Both have a limited region of validity. For simplicity, the comparison is performed on a step-index fiber with a cladding of infinite extent. However, the full-wave method is capable of dealing with arbitrary index profiles.
© 2007 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: July 5, 2007
Revised Manuscript: July 30, 2007
Manuscript Accepted: July 31, 2007
Published: September 17, 2007
Rutger W. Smink, Bastiaan P. de Hon, and Anton G. Tijhuis, "Bending loss in optical fibers—a full-wave approach," J. Opt. Soc. Am. B 24, 2610-2618 (2007)