Capacity Enhancement of Space-Division Multiplexed Systems by using Statistical Channel State Information

Amhoud, El Mehdi; Jaouën, Yves; Ben-Othman, Ghaya Rekaya

doi:10.1364/acpc.2015.as4e.2

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…Since G 12 (•) and G 34 (•) are the last rotations in the matrix product forming R in (8), they simply apply phase shifts to the 2D constellation projections that are transmitted in each channel. It is found that they do not affect the transmission performance for the model in (1), and hence it suffices to let φ 1 = φ 2 = 0 in (8) such that G 12 (0) = G 34 (0) = I and R = G 24 (φ 3 )G 23 (φ)G 14 (φ 5 )G 13 (φ 6 ), requiring only four angles to optimize.…”

Section: B Optimization Proceduresmentioning

confidence: 99%

“…A potential drawback of some transmitter-based schemes is that they often require the knowledge of instantaneous channel-state information (CSI), which is fed back from the receiver to the transmitter. In fiber-optic systems, the channel tends to change faster than the round-trip delay, thus precluding the use of reliable instantaneous CSI at the transmitter [23]. Methods that only use statistical or no CSI are therefore of practical interest.…”

Section: Introductionmentioning

confidence: 99%

“…More recently in the context of fiber-optic transmission, schemes involving nonlinearity precompensation [6], [11], preequalization [15], [16], and precoding [17] have been proposed. Space-time coding and power-allocation schemes have also been used to maximize power efficiency through waterfilling solutions [18], and to mitigate polarization-dependent loss (PDL) [19]- [21] and mode-dependent loss (MDL) [22], [23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of Transmitter-Side Signal Rotations in the Presence of Laser Phase Noise

Alfredsson

Agrell

Karlsson

et al. 2020

J. Lightwave Technol.

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The effects of transmitter-side multidimensional signal rotations on the performance of multichannel optical transmission are studied in the presence of laser phase noise. In particular, the laser phase noise is assumed to be uncorrelated between channels. To carry out this study, a simple multichannel laser-phase-noise model that has been experimentally validated for weakly-coupled multicore-fiber transmission is considered. As the considered rotation scheme is intended to work in conjunction with receiver-side carrier phase estimation (CPE), the model is modified to further assume that imperfect CPE has taken place, leaving residual phase noise in the processed signal. Based on this model, two receiver structures are derived and used to numerically optimize transmitter-side signal rotations through Monte Carlo simulations. For reasonable amounts of residual phase noise, rotations based on Hadamard matrices are found to be near-optimal for transmission of four-dimensional signals. Furthermore, Hadamard rotations can be performed for any dimension that is a power of two. By exploiting this property, an increase of up to 0.25 bit per complex symbol in an achievable information rate is observed for transmission of higher-order constellations.

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Section: B Optimization Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Transmitter-Side Signal Rotations in the Presence of Laser Phase Noise

Alfredsson

Agrell

Karlsson

et al. 2020

J. Lightwave Technol.

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Capacity Enhancement of Few-Mode Fiber Transmission Systems Impaired by Mode-Dependent Loss

2018

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Space-division multiplexing over few-mode fibers is a promising solution to increase the capacity of the future generation of optical transmission systems. Mode-dependent loss (MDL) is known to have a detrimental impact on the capacity of few-mode fiber systems. In the presence of MDL, spatial modes experience different attenuations which results in capacity reduction. In this work, we propose a digital signal processing solution and an optical solution to mitigate the impact of MDL and improve the channel capacity. First, we show that statistical channel state information can be used for a better power allocation for spatial modes instead of equal launch power to increase the system capacity. Afterwards, we propose a deterministic mode scrambling strategy to efficiently reduces the impact of MDL and improves few-mode fiber systems capacity. This scrambling strategy can be efficiently combined with the optimal power allocation to further enhance the capacity. Through numerical simulations of the average and outage capacities, we show that the proposed techniques bring significant capacity gains.

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Capacity Enhancement of Space-Division Multiplexed Systems by using Statistical Channel State Information

Cited by 2 publications

References 1 publication

Optimization of Transmitter-Side Signal Rotations in the Presence of Laser Phase Noise

Optimization of Transmitter-Side Signal Rotations in the Presence of Laser Phase Noise

Capacity Enhancement of Few-Mode Fiber Transmission Systems Impaired by Mode-Dependent Loss

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