Optical fibers which transmit only Light with a certain polarization.

Single-polarization fibers are specialty optical fibers which can transmit light with a certain linear Polarization direction, whereas light with the other polarization direction is either not guided or at least experiences strong optical losses. Such fibers should not be confused with polarization maintaining fibers, which guide light with any polarization state but can preserve a linear polarization state when the polarization direction is properly aligned with the birefringence axis.