Similarities between fiber bandwidth spectra and loss spectra are found to occur. Wavelength-dependent far-field radiation patterns were used to deduce that high OH ion concentrations, near the center of the core, caused differential attenuation of low-order modes. This resulted in bandwidth peaks at the same wavelengths where water absorption loss peaked.
© 1981 Optical Society of America
Leonard G. Cohen and S. J. Jang, "Interrelationship between water absorption loss and dispersion in multimode fiber," Appl. Opt. 20, 1635-1639 (1981)