FIELD: communication equipment.
SUBSTANCE: invention relates to communication engineering and can be used for modem multiplexing and increasing throughput of fiber-optic communication network transmission lines. At modular multiplexer at the first stage, fundamental modes N of single-mode optical fibers are converted into spatial vortex modes carrying different orbital angular momentum (OAM), which at second stage is converted into N orthogonal proper modes of low-mode optical fiber, and in modal demultiplexer at first stage N orthogonal proper modes of low-mode optical fiber are converted into spatial vortex modes carrying different orbital angular momentum (OAM), which at second stage is converted to fundamental modes N single-mode optical fibers.
EFFECT: technical result consists in expanded field of application.
1 cl, 1 dwg
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