Abstract

This paper describes an interrelationship between loss and dispersion which can result in a high bandwidth over a much wider wavelength region than predicted for perfect power-law profiles.⁽¹⁾ The fibers studied were drawn from MCVD preforms with germania phosphosilicate (Ge0₂-P₂0₅-Si0₂) cores and phosphoborosilicate (P₂0₅-B₂0₃-Si0₂) barrier layers which separate the cores from silica (Si0₂) claddings. Results are compared for two fibers. Fiber #1 has a moderately high OH ion concentration and a core profile shape that is well graded for the 0.8-1.1-µn wavelength region.⁽²⁾ Fiber #2 is a low-loss fiber containing very little water.