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|1. (WO2018043320) OPTICAL TRANSMISSION SYSTEM|
|Applicants:||NIPPON TELEGRAPH AND TELEPHONE CORPORATION
|Title:||OPTICAL TRANSMISSION SYSTEM|
The optical transmission system according to the present disclosure is a mode-division multiplexing optical transmission system in which the transmission path is a multi-mode optical fiber in which a plurality of propagation modes are propagated, the system comprising an optical fiber transmission path (83) including an optical fiber having two or more propagation modes, and a plurality of mode converters (91) which cause mode coupling between at least one set of modes, wherein the variation in placement intervals of the plurality of mode converters (91) is no greater than a threshold value determined by the transmission path length (Lt) of the optical fiber transmission path (83).