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Demonstration of km-scale orbital angular momentum multiplexing transmission using 4-level pulse-amplitude modulation signals.
Optics Letters 2017 Februrary 16
By designing and fabricating two kinds of orbital angular momentum (OAM) fibers, we demonstrate two OAM modes (OAM<sub>+1</sub> and OAM<sub>-1</sub>) multiplexing transmission and demultiplexing in OAM fiber links. Moreover, we also experimentally demonstrate 4-level pulse-amplitude modulation (PAM-4) signal transmission using two OAM modes multiplexing in a km-scale OAM fiber and achieve a bit-error rate (BER) below 2×10<sup>-3</sup> without multiple-input-multiple-output (MIMO) digital signal processing (DSP). The obtained results with favorable data-carrying OAM multiplexing transmission performance show potential application in km-scale short-reach optical interconnects.
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