| 摘要 |
The invention relates more particularly to an emulation device for emulation of a polarisation mode dispersion (PMD) of an optical transmission system, comprising the following: an emulator input for an optical input signal; at least one controllable double refracting polarisation transformation element having a transformation element input and output which is used for polarisation transformation of said optical signal; at least one double refracting DGD element having a DGD input and a DGD output, said DGD element having a differential group delay time (DGD) between two mutually orthogonally polarised propagation modes of the DGD element; and an emulator output for a PMD-modified optical output signal, said polarisation transformation element and DGD element being disposed in relation to each other in the optical signal path between the emulator input and the emulator output, whereby the double refracting axes on the transformation element output are twisted at a torsional angle which is different from zero degrees in relation to the double refracting axes of the DGD input. Also disclosed is a novel PMD compensation device and a novel measurement device. |
