Two modes have been launched into a conventional 10-m long multimode graded-index optical fiber using spatial filtering techniques. The measured cross talk between the two modes in the baseband is −20 dB at the output end of the fiber. Modal multiplexing thus appears to be possible over short fiber lengths.
© 1982 Optical Society of America
Original Manuscript: November 24, 1981
Published: June 1, 1982
S. Berdagué and P. Facq, "Mode division multiplexing in optical fibers," Appl. Opt. 21, 1950-1955 (1982)