A method and apparatus for providing controllable second-order polarization mode
dispersion for fiber optic transmission systems are provided. A section of fixed
high birefringent optical fiber, a polarization controller, and a variable differential
group delay module are provided. The polarization controller is connected to the
optical fiber section, and the variable differential group delay module is connected
to the polarization controller. The variable differential group delay module is
controlled to vary the second-order polarization mode dispersion values at an output
of the high birefringent optical fiber section.
