The statistics of backscattering induced by sidewall roughness in dielectric optical waveguides is experimentally investigated. We demonstrate that waveguide backscattering is a wavelength-dependent random process, whose statistics follows the rules of single scattering systems, independently of shape, size, and refractive index contrast of the waveguide, and of the light polarization state. The intensity of backscattering is distributed according to an exponential probability density function, and its mean delay corresponds to a reflection at half the effective length of the waveguide.
© 2010 Optical Society of America
Original Manuscript: March 18, 2010
Manuscript Accepted: April 2, 2010
Published: May 19, 2010
Francesco Morichetti, Antonio Canciamilla, and Andrea Melloni, "Statistics of backscattering in optical waveguides," Opt. Lett. 35, 1777-1779 (2010)