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73.7 Tb/s (96 x 3 x 256-Gb/s) mode-division-multiplexed DP-16QAM transmission with inline MM-EDFA

V.A.J.M. Sleiffer, Y. Jung, V. Veljanovski, R.G.H. van Uden, M. Kuschnerov, H. Chen, B. Inan, L. Grüner Nielsen, Y. Sun, D.J. Richardson, S.U. Alam, F. Poletti, J.K. Sahu, A. Dhar, A.M.J. Koonen, B. Corbett, R. Winfield, A.D. Ellis, and H. de Waardt

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Abstract

Transmission of a 73.7 Tb/s (96x3x256-Gb/s) DP-16QAM mode-division-multiplexed signal over 119km of few-mode fiber transmission line incorporating an inline multi mode EDFA and a phase plate based mode (de-)multiplexer is demonstrated. Data-aided 6x6 MIMO digital signal processing was used to demodulate the signal. The total demonstrated net capacity, taking into account 20% of FEC-overhead and 7.5% additional overhead (Ethernet and training sequences), is 57.6 Tb/s, corresponding to a spectral efficiency of 12 bits/s/Hz.

©2012 Optical Society of America

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Figures (8)
Fig. 1
Fig. 1 Experimental setup. (a) Electrical 4-PAM generated by the DAC. (b) 256-Gb/s DP-16QAM constellations in back-to-back single-mode configuration. (c) Spectrum at transmitter side (96 channels).

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Fig. 2
Fig. 2 Mode intensity profiles after phase plates (middle row) and after ~10m of FMF (bottom row).

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Fig. 3
Fig. 3 Basic measurements for ER between LP01 and LP11 modes. (a) Coupling of a LP11 mode into a single-mode fiber (SMF) to select the best phase plates (b) Exciting the LP01 / LP11 mode and checking the ER and back-conversion from LP11 to LP01 (c) Using tele-centric launching to obtain a cleaner LP01 excitation in the FMF (d) Increased LP11 to LP01 ER.

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Fig. 4
Fig. 4 Mode multiplexer and de-multiplexer as used in the transmission experiment

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Fig. 5
Fig. 5 DM = Dichroic mirror. (a) Schematic of the MM-EDFA. (b) The measured modal gain spectrum versus frequency at a coupled 980nm pump power of 22dBm and a signal power of −5 dBm per mode.

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Fig. 6
Fig. 6 (a) Back-to-back curves. (b) Bit error rate versus received power per channel in MDM back-to-back configuration. (c) Bit error rate versus distance for the 193.40 THz channel

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Fig. 7
Fig. 7 Magnitude of impulse response versus number of taps of the 6x6 MIMO-equalizer obtained after 119km of transmission for the channel at 193.4 THz.

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Fig. 8
Fig. 8 Bit error rate for all 96 WDM channels after 119km transmission distance with the received spectrum after mode DEMUX. Bottom: constellations after transmission.

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Tables (2)

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Table 1 Crosstalk levels back-to-back [dB]

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Table 2 Span 1 (spool 1,2,3) (total length 84km) and span 2 (spool 4,5) (total length 35km)

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