Method of ascertaining the polarization mode dispersion (PMD) of a transmission system esp. a transmission laser, using a tunable optical element in the form of a narrow-band laser

摘要

Methods of measurement, as based on interferometry, for determining PMD, have proved to be slow and require cumbersome equipment and are not suitable for PMD-compensation devices in transmission paths. An optoelectronic heterodyne receiver is now used to provide modulation of an optical data signal being analyzed with the radiation of a wavelength-tunable optical element, in particular a laser.