The results of a cutback measurement of a glass–ceramic optical waveguide with single-mode fiber geometry have demonstrated that sub decibels per kilometer losses can be achieved. Difference spectra show that the limit of intrinsic scattering in these two-phase structures ought to be tens of decibels per kilometer.
© 1998 Optical Society of America
P. A. Tick, "Are low-loss glass ceramic optical waveguides possible?," Opt. Lett. 23, 1904-1905 (1998)