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Mode-Division Multiplexing Over 96 km of Few-Mode Fiber Using Coherent 6 ,\times, 6 MIMO Processing

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13 Author(s)
Ryf, R. ; Bell Labs., Alcatel-Lucent, Holmdel, NJ, USA ; Randel, S. ; Gnauck, A.H. ; Bolle, C.
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We report simultaneous transmission of six spatial and polarization modes, each carrying 40 Gb/s quadrature-phase-shift-keyed channels over 96 km of a low-differential group delay few-mode fiber. The channels are successfully recovered by offline DSP based on coherent detection and multiple-input multiple-output processing. A penalty of <;1.2 dB is achieved by using 6 × 6 feed-forward equalizers with 120 taps each. The 6 × 6 impulse-response matrix fully characterizing the few-mode fiber is presented, revealing the coupling characteristics between the modes. The results are obtained using mode multiplexers based on phase plates with a mode selectivity of >;28 dB.

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Lightwave Technology, Journal of  (Volume:30 ,  Issue: 4 )