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Opt Express. 2011 Aug 15;19(17):16672-9. doi: 10.1364/OE.19.016672.

Dual-LP11 mode 4×4 MIMO-OFDM transmission over a two-mode fiber.

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National ICT Australia and Centre for Energy- Efficient Telecommunications (CEET), Department of Electrical and Electronic Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.


We report successful transmission of dual-LP(11) mode (LP(11a) and LP(11b)), dual polarization coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals over two-mode fibers (TMF) using all-fiber mode converters. Mode converters based on mechanically induced long-period grating with better than 20 dB extinction ratios are realized and used for interfacing single-mode fiber transmitter and receivers to the TMF. We demonstrate that by using 4×4 MIMO-OFDM processing, the random coupling of the two LP(11) spatial modes can be successfully tracked and equalized with a one-tap frequency-domain equalizer. We achieve successful transmission of 35.3 Gb/s over 26-km two-mode fiber with less than 3 dB penalty.

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