For citations:
Kalugin E.E., Mukhtubaev A.B., Meshkovskiy I.K. Polarization extinction ratio in polarization maintaining fiber sealed with glass solder. Scientific and Technical Journal of Information Technologies, Mechanics and Optics. 2022;22(4):643-649. (In Russ.) https://doi.org/10.17586/2226-1494-2022-22-4-643-649