F. Pozzi et al., GROUP EFFECTIVE INDEXES OF DIFFERENT TYPES OF OPTICAL FIBERS MEASUREDAROUND 1550 NM, Journal of applied physics, 75(6), 1994, pp. 3190-3192
The effective group indices of different single mode fiber types (stan
dard, dispersion shifted or dispersion compensated, polarization maint
aining, pure silica core, erbium doped) have been measured in the wave
length range 1.500-1.580 mum; their values range from 1.4635 to 1.4778
at 1.54 mum. These values have been determined by a resonant-cavity m
ethod, which provides an accuracy to the fourth decimal place.