Abstract

P₂O₅-SiO₂ glasses are very attractive as ultralow-loss optical- fiber glass materials because their Rayleigh scattering loss is lower than that of pure SiO₂ glass and their infrared absorption loss has a comparable value.¹ The lowest Rayleigh-scattering coefficient to date of 0.63 dB km^-1 μm^-4 was reported in a multimode fiber with a P₂O₅-SiO₂ core and B₂O₃-SiO₂ cladding.² However, the total loss of this fiber was more than 1 dB/km in the 1.5-(μm wavelength region because of the high infrared absorption loss of B₂O_3-SiO₂ glass. With regard to single-mode fiber, pure-SiO₂-core fiber has the lowest reported Rayleigh-scattering loss.

© 1994 Optical Society of America