St. Petersburg Polytechnic University Journal: Physics and Mathematics Научно-технические ведомости СПбГПУ. Физико-математические науки 2304-9782, 2618-8686, 2405-7223 14 Method of optical vortices excitation in graded index optical fibers Метод возбуждения оптических вихрей в градиентных волоконных  световодах Ilin Nikita Kiesewetter Dmitry 10 06 2010 2 98 96 102

The technique of optical vortices excitation in optical fibers by focused laser beam is considered. The method of detection of optical vortices is described. The results of experimental investigation are presented.

 optical fiber optical vortex speckle-structure