Abstract
We investigate and compare the performance of normal and probabilistic shaping (PS) 16-ary quadrature amplitude modulation (16QAM) in a photonic vector millimeter-wave (mm-wave) signal generation system adopting heterodyne coherent detection. And we obtain a better bit-error ratio (BER) performance in the PS 16QAM scheme compared to the normal 16QAM scheme in the simulation. We also for the first time experimentally demonstrate the feasibility of PS-polarization-division-multiplexing 16QAM in a photonic vector mm-wave signal generation system employing heterodyne coherent detection. We obtain the same BER in PS and normal schemes with the PS scheme providing a higher bit rate. Then we experimentally carry out the performance investigation of PS in a 16QAM-modulated radio over fiber system with 40 m wireless transmission.
Highlights
To catch up with the rapidly growing requirement of the Internet and communication networks, emerging technologies are required to provide a higher data rate, higher spectral efficiency (SE), and greater transmission distance.[1]
The data can be recovered by MATLAB programing including intermediate frequency (IF) down conversion, symbol decision, 16-ary quadrature amplitude modulation (16QAM) de-mapping, and bit-error ratio (BER) calculation based on the comparison of the recovered data and the original transmitted data
We have compared the performance of normal- and Probabilistic shaping (PS)-16QAM in a heterodyne system and got a better BER performance in the PS-16QAM scheme compared to the normal-16QAM scheme in the simulation
Summary
To catch up with the rapidly growing requirement of the Internet and communication networks, emerging technologies are required to provide a higher data rate, higher spectral efficiency (SE), and greater transmission distance.[1] Probabilistic shaping (PS) is a promising technology that can reach these needs and meet surging data traffic demands. PS is attracting considerable attention for higher SE, higher capacity, and longer transmission distance in an optical fiber communication system.[2,3,4,5,6,7,8,9] What is more, the advent of PS offers unparalleled flexibility to optical systems without increasing the complexity of the optical network.[7] Because of the nonlinearities, the fiber communication system is power-constrained. PS is attracting more interest of researchers since September 2016 when Nokia Bell Labs et al demonstrated 1 Tbit/s data transmission over 4-carrier super-channel in the backbone network of Germany leveraging probabilistically shaped constellations, which has achieved unprecedented transmission
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