BROAD-BAND DISPERSION-COMPENSATING FIBER FOR HIGH-BIT-RATE TRANSMISSION NETWORK USE

The optimum refractive-index profile and drawing temperature were inve stigated so as to maximize the figure of merit for multicladding broad band dispersion-compensating fibers. Based on the results of the inves tigation, the authors have fabricated a highly bend-resistant fiber wi th a 92.6-ps/(nm dB) figure of merit using the modified chemical-vapor deposition method for dispersion compensation in the 1.5-1.6-mu m wav elength region. The manufactured dispersion compensator does not suffe r bend loss at 1.55 mu m for curvatures of radia of 6.3 and 3.3 cm, an d it has a 1.1-dB/km bend loss at a curvature of radius of 1.6 cm. Cod oping the germanium silicate core with fluorine diminishes the optical loss down to 0.70 dB/km at a 1.55-mu m wavelength.