Surface roughness is normally considered to be the main cause of attenuation in intergrated-optics glass waveguides. Previous analyses have concentrated on scattering of light into the radiation field; in fact, depending on the roughness length scale, scattering can be predominantly in the backward direction, raising the question of how important the coupling with the backward-directed bound mode is. We investigate this effect and show that it can be neglected in most circumstances.
© 1996 Optical Society of America
Original Manuscript: May 10, 1996
Published: November 15, 1996
François Ladouceur and Leon Poladian, "Surface roughness and backscattering," Opt. Lett. 21, 1833-1835 (1996)