Mode-Dependent Loss and Gain Estimation in SDM Transmission Based on MMSE Equalizers

Ospina, Ruby S. B.; Hout, Menno van den; Alvarado-Zacarias, Juan Carlos; Antonio-López, Jose Enrique; Bigot-Astruc, Marianne; Correa, Adrian Amezcua; Sillard, Pierre; Amezcua‐Correa, Rodrigo; Okonkwo, Chigo; Mello, Darli A. A.

doi:10.1109/jlt.2020.3044266

Cited by 24 publications

(14 citation statements)

References 25 publications

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“…Calculation of the transmission channel matrix. Impulse response and MDL can be estimated from the channel matrix 44 . While the MIMO DSP, used for signal reception, estimates the inverse of the channel matrix, the channel matrix was obtained by running the MIMO equalizer in the reverse direction.…”

Section: Methodsmentioning

confidence: 99%

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Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

et al. 2021

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Data rates in optical fiber networks have increased exponentially over the past decades and core-networks are expected to operate in the peta-bit-per-second regime by 2030. As current single-mode fiber-based transmission systems are reaching their capacity limits, space-division multiplexing has been investigated as a means to increase the per-fiber capacity. Of all space-division multiplexing fibers proposed to date, multi-mode fibers have the highest spatial channel density, as signals traveling in orthogonal fiber modes share the same fiber-core. By combining a high mode-count multi-mode fiber with wideband wavelength-division multiplexing, we report a peta-bit-per-second class transmission demonstration in multi-mode fibers. This was enabled by combining three key technologies: a wideband optical comb-based transmitter to generate highly spectral efficient 64-quadrature-amplitude modulated signals between 1528 nm and 1610 nm wavelength, a broadband mode-multiplexer, based on multi-plane light conversion, and a 15-mode multi-mode fiber with optimized transmission characteristics for wideband operation.

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Section: Methodsmentioning

confidence: 99%

“…MDL, as displayed in Fig. 4d, is then defined by averaging over the channel bandwidth as follows 44 :…”

Section: Methodsmentioning

confidence: 99%

Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

et al. 2021

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“…The most widely used linear MIMO receiver for SDM systems is based on the design of filter

in Figure 1 to minimize the mean squared error (MSE), which is called a linear MMSE MIMO receiver [ 28 , 37 , 39 ]. Mathematically, the MSE for the linear MIMO receiver under the MMSE criterion is defined as:

where

with

as the output vector of the linear MIMO receiver

.…”

Section: Sdm Communication System Modelmentioning

confidence: 99%

“…For the fiber parameters, we used the multi-core fiber data reported in [ 41 ], considering the number of modes

and the central wavelength

nm. The selection of this multi-core fiber allow us to compare the results of this work with those presented in [ 28 ], and to obtain the fiber parameters needed for the numerical simulations from [ 41 ].…”

Section: Numerical Simulation Of Linear Mimo Fse Receiver For Mdl-imp...mentioning

confidence: 99%

“…This boosts looking for simpler DSP schemes that avoid the enormous complexity required from the classical equalizers proposed for a PDM system and initially adapted to SDM systems [ 24 ]. In particular, linear MIMO receiver designs have been proposed for SDM systems [ 27 , 28 ] by expanding PDM systems [ 12 , 21 , 29 ], where a fractional-spaced equalizer (FSE) with an oversampling rate

of two is used. A review of different combinations of fiber types and DSP schemes reported in the literature with their associated complexity is summarized in [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

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Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels

Torres¹,

Cañete

Río

2022

Sensors

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The use of digital signal processors (DSP) to equalize coherent optical communication systems based on spatial division multiplexing (SDM) techniques is widespread in current optical receivers. However, most of DSP implementation approaches found in the literature assume a negligible mode-dependent loss (MDL). This paper is focused on the linear multiple-input multiple-output (MIMO) receiver designed to optimize the minimum mean square error (MMSE) for a coherent SDM optical communication system, without previous assumptions on receiver oversampling or analog front-end realizations. The influence of the roll-off factor of a generic pulse-amplitude modulation (PAM) transmitter on system performance is studied as well. As a main result of the proposed approach, the ability of a simple match filter (MF) based MIMO receiver to completely eliminate inter-symbol interference (ISI) and crosstalk for SDM systems under the assumption of negligible MDL is demonstrated. The performance of the linear MIMO fractionally-spaced equalizer (FSE) receiver for an SDM system with a MDL-impaired channel is then evaluated by numerical simulations using novel system performance indicators, in the form of signal to noise and distortion ratio (SNDR) loss, with respect to the case without MDL. System performance improvements by increasing the transmitter roll-off factor are also quantified.

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Study on joint effects of modal dispersion, mode-dependent loss and noise by unified density-matrix formalism

Yang,

Liu,

Zhang

et al. 2024

Results in Physics

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Mode-Dependent Loss and Gain Estimation in SDM Transmission Based on MMSE Equalizers

Cited by 24 publications

References 25 publications

Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

Matched Filtering for MIMO Coherent Optical Communications with Mode-Dependent Loss Channels

Study on joint effects of modal dispersion, mode-dependent loss and noise by unified density-matrix formalism

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