Disclosed is a dispersion controlled optical waveguide fiber, and
telecommunication systems using such a waveguide fiber, in which the end
to end total dispersion and total dispersion slope is controlled by
varying the refractive index profile along the fiber length. The waveguide
fiber includes length portions each of which is characterized by total
dispersion having a magnitude and sign and total dispersion slope having a
magnitude and sign. The magnitudes and signs of total dispersion and total
dispersion slope of respective length portions are chosen to provide for
the optical waveguide fiber a desired end to end total dispersion and
total dispersion slope. An advantage is achieved in the present invention
by designing the refractive index profiles of the length portions to have
total dispersion and total dispersion slope of opposite sign.
