Patent ID: 6847484
Filing Date: 2005-01-25
Classification: G02F,H04B

Abstract:
1. A coherent polarization mode dispersion (“PMD”) generator for generating a coherent PMD spectrum, wherein said generator comprises: a first birefringent stage comprising a first DGD element; a second birefringent stage comprising a second DGD element and a first phase-shifting element, wherein said second DGD element is harmonic; a third birefringent stage comprising a third DGD element and a second phase-shifting element, wherein said third DGD element is harmonic; a last birefringent stage comprising a last DGD element, wherein said second and third stages are between said first and last stages; and wherein at least two of the first, second, third, and last states have respective residual optical retardation values that are substantially the same.