Roughness-induced radiation losses in optical micro or nanofibers

Effect of intrinsic surface roughness on the efficiency of intermodal phase matching in silica optical nanofibers.

We investigate the effect of intrinsic surface roughness associated to frozen thermal oscillations from the fiber fabrication process on the efficiency of third-harmonic generation via intermodal phase matching in silica nanofibers. Already a periodic wave with roughness of 0.2 nm reduces the efficiency by roughly 50% in a 1-mm optical nanofiber, with the divergence growing quadratically with d...

Ultrahigh transmission optical nanofibers

Roughness losses and volume-current methods in photonic-crystal waveguides

We present predicted relative scattering losses from sidewall roughness in a strip waveguide compared to an identical waveguide surrounded by a photonic crystal with a complete or incomplete gap in both 2d and 3d. To do so, we develop a new semi-analytical extension of the classic “volume-current method” (Green’s functions with a Born approximation), correcting a longstanding limitation of such...

Polarization Losses in Optical Fibers

Very long span optical communications are mainly limited by the chromatic dispersion (CD) or group velocity dispersion (GVD), fiber nonlinearities, and optical amplifier noise (Agrawal 2005). Different frequencies of a pulse travel with their own velocities, which involves a pulse spreading. In a fiber-optic communication system, information is transmitted within a fiber by using a coded sequen...

Nanofibers: Friend or Foe?

Alke Petri-Fink 1, Barbara Rothen-Rutishauser 1 and Martin J. D. Clift 1,2,* 1 BioNanomaterials, Adolphe Merkle Institute, University of Fribourg, Rte de l’Ancienne Papeterie, Marly 1, 1723 Fribourg, Switzerland; [email protected] (A.P.-F.); [email protected] (B.R.-R.) 2 Swansea University Medical School, Singleton Park Campus, Swansea University, Swansea, Wales SA2 8PP, UK * Corresponde...