DISPERSION CORRECTED SINGLE MODE WAVEGUIDE

摘要

PROBLEM TO BE SOLVED: To manufacture a dispersion compensation fiber with high negative dispersion value and a large effective area. SOLUTION: A preform to be stretched having a core glass region and a surrounding clad layer is formed and stretched by >=100 g stretching into a waveguide fiber having 125 to 170μm outer diameter. The waveguide fiber is coated with at least one layer of a polymer material. The coated waveguide fiber is heat treated to substantially remove the residual stress in the coating. The core glass region consists of at least three segments and the surrounding clad layer surrounds the core glass region and has the refractive index nc lower than that of at least a part of the core glass region. The radii r1 and ri and relative refractive index percentagesΔ1% andΔi% are selected so as to show negative total dispersion <=-150 ps/nm-km at 1550 nm.