Berdagué S, Facq P
Appl Opt. 1982 Jun 1;21(11):1950-5. doi: 10.1364/AO.21.001950.
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.