We present experimental results for combined mode-multiplexed and wavelength multiplexed transmission over conventional graded-index multimode fibers. We use mode-selective photonic lanterns as mode couplers to precisely excite a subset of the modes of the multimode fiber and additionally to compensate for the differential group delay between the excited modes. Spatial mode filters are added to suppress undesired higher order modes. We transmit 30-Gbaud QPSK signals over 60 WDM channels, 3 spatial modes, and 2 polarizations, reaching a distance of 310 km based on a 44.3 km long span. We also report about transmission experiments over 6 spatial modes for a 17-km single-span experiment. The results indicate that multimode fibers support scalable mode-division multiplexing approaches, where modes can be added over time if desired. Also the results indicate that mode-multiplexed transmission distance over 300 km are possible in conventional multimode fibers.


Electrical and Computer Engineering

Keywords and Phrases

Fibers; Group delay; Local area networks; Multiplexing, Differential group delay; Graded-Index Multimode fibers; Higher-order modes; Mode couplers; Mode-division multiplexing; Spatial mode filters; Transmission distances; Transmission experiments, Multimode fibers

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

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© 2015 Optical Society of American (OSA), All rights reserved.

Publication Date

01 Jan 2015