Transmission properties of graded-index triple-clad single-mode fiber for 1.55-µm system operation

Graded-index triple clad (GITC)single-mode fiber exhibits low loss and low dispersion (< 2 ps/km-nm) over a wide wavelength range. The fundamental mode field radius of this fiber was measured as a function of wavelength using the transverse offset technique. This showed that the fundamental mode radial power (or field) distribution can be well represented by a Gaussian approximation. The basket weave loss test was made to obtain the fiber bend sensitivity. The bend induced additional losses of GITC single-mode fiber at 1.55 μm is much smaller than that of single-clad single-mode fibers.