Visible high-speed optical transmission over photonic crystal fiber.

We demonstrated high-speed transmission at visible wavelengths over a 1 km photonic crystal fiber (PCF). We achieved a 1 Gbit/s transmission at 783 nm by using the direct modulation of a cost-effective Fabry-Perot laser diode (FP-LD). By employing the external modulation of the longitudinally single-mode grating-stabilized LD, we obtained the first penalty free 10 Gbit/s transmission at 780 nm.

Reflection properties of splices in graded-index optical fibers.

The reflection properties of splices, such as fusion splices and V-groove splices, in graded-index multimode optical fibers were investigated theoretically and experimentally. Equations have been derived for calculating reflection in fusion splices and V-groove splices. Several reflection characteristics in splices were measured using a time-domain reflectometer. The measured results are discussed using the deived equations