Experimental demonstration of utilizing adaptive optics to mitigate intra-modal-gronp power conpllng of few-mode fiber in a two-channel 20-Gbit/s QPSK mode-division-mnltiplexed system

We experimentally demonstrate utilizing adaptive optics to mitigate intra-modal-group power coupling in LP
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mode group for two-channel 20-Gbit/s QPSK mode-division-multiplexing transmission. Power penalty of < 2 dB and < 5 dB are achieved for the two channels, respectively.