Abstract
In addition to capacity, the future high-speed optical transport networks will also be constrained by energy consumption. In order to solve the capacity and energy constraints simultaneously, in this paper we propose the use of energy-efficient hybrid D-dimensional signaling (D>4) by employing all available degrees of freedom for conveyance of the information over a single carrier including amplitude, phase, polarization and orbital angular momentum (OAM). Given the fact that the OAM eigenstates, associated with the azimuthal phase dependence of the complex electric field, are orthogonal, they can be used as basis functions for multidimensional signaling. Since the information capacity is a linear function of number of dimensions, through D-dimensional signal constellations we can significantly improve the overall optical channel capacity. The energy-efficiency problem is solved, in this paper, by properly designing the D-dimensional signal constellation such that the mutual information is maximized, while taking the energy constraint into account. We demonstrate high-potential of proposed energy-efficient hybrid D-dimensional coded-modulation scheme by Monte Carlo simulations.
Highlights
The exponential internet traffic growth projections require considerable increase of transmission rates at every level of the underlying information infrastructure, from core to access and data center networks
We know that photons can carry spin angular momentum (SAM), which is associated with polarization, and orbital angular momentum (OAM), which is associated with azimuthal phase dependence of the form exp(ilφ) (l = 0, ± 1, ± 2,...; i2 = −1)
At bit-error rate (BER) of 2.5 × 10−7, the L = 4, M = 4 efficient polarization-division multiplexed (EE-PDM) coded modulation scheme outperforms corresponding PDM 256-quadrature amplitude modulation (QAM) by even 9.98 dB! In the same Figure, we provide the curve for threedimensional signal-constellation with 64 points, obtained by sphere packing method due to Sloane [16]
Summary
The exponential internet traffic growth projections require considerable increase of transmission rates at every level of the underlying information infrastructure, from core to access and data center networks. As a solution to never ending high-capacity demands, in a series of articles (e.g [3,4,5,6].) we proposed the use of multidimensional coded-modulation schemes. In order to solve high-bandwidth demands and energy-efficiency problems simultaneously, in this paper, we propose an energy-efficient spatial-domain-based hybrid coded-modulation scheme. The proposed scheme is based on hybrid D-dimensional (D>4) signal constellations, and exploits all available degrees of freedom for conveyance of the information over a single carrier including amplitude, phase, polarization and OAM. We demonstrate high-potential of proposed energy-efficient hybrid Ddimensional coded-modulation scheme by Monte Carlo simulations.
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