| Polarisationselemente allgemein | G02B 5/30 |
| Polarisationssysteme allgemein | G02B 27/28 |
| Optische Polarisations-Multiplexsysteme | H04J 14/06 |
| Polarisation elements in general | G02B 5/30 |
| Polarisation systems in general | G02B 27/28 |
| Optical polarisation multiplex systems | H04J 14/06 |