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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Ospina, Ruby S. B. [1] ; van den Hout, Menno [2] ; Alvarado-Zacarias, Juan Carlos [3] ; Antonio-Lopez, Jose Enrique [3] ; Bigot-Astruc, Marianne [4] ; Correa, Adrian Amezcua [4] ; Sillard, Pierre [4] ; Amezcua-Correa, Rodrigo [3] ; Okonkwo, Chigo [2] ; Mello, Darli A. A. [1]
Total Authors: 10
[1] Univ Estadual Campinas, Sch Elect & Comp Engn, BR-13083970 Campinas - Brazil
[2] Eindhoven Univ Technol, High Capac Opt Transmiss Lab, Electroopt Commun Grp, NL-5612 AZ Eindhoven - Netherlands
[3] Univ Cent Florida, Coll Opt & Photon, CREOL, Orlando, FL 32816 - USA
[4] Prysmian Grp, F-62092 Haisnes - France
Total Affiliations: 4
Document type: Journal article
Source: Journal of Lightwave Technology; v. 39, n. 7, p. 1968-1975, APR 1 2021.
Web of Science Citations: 0

The capacity in space division multiplexing (SDM) systems with coupled channels is fundamentally limited by mode-dependent loss (MDL) and mode-dependent gain (MDG) generated in components and amplifiers. In these systems, MDL/MDG must be accurately estimated for performance analysis and troubleshooting. Most recent demonstrations of SDM with coupled channels perform MDL/MDG estimation by digital signal processing (DSP) techniques based on the coefficients of multiple-input multiple-output (MIMO) adaptive equalizers. Although these methods provide a valid indication of the order of magnitude of the accumulated MDL/MDG over the link, MIMO equalizers are usually updated according to the minimum mean square error (MMSE) criterion, which is known to depend on the channel signal-to-noise ratio (SNR). Therefore, MDL/MDG estimation techniques based on the adaptive filter coefficients are also impaired by noise. In this article, we model analytically the influence of the SNR on DSP-based MDL/MDG estimation, and show that the technique is prone to errors. Based on the transfer function of MIMO MMSE equalizers, and assuming a known SNR, we calculate a correction factor that improves the estimation process in moderate levels of MDL/MDG and SNR. The correction factor is validated by simulation of a 6-mode long-haul transmission link, and experimentally using a 3-mode transmission link. The results confirm the limitations of the standard estimation method in scenarios of high additive noise and MDL/MDG, and indicate the correction factor as a possible solution in practical SDM scenarios. (AU)

FAPESP's process: 18/14026-5 - Design and optimization of submarine optical links using space-division multiplexing
Grantee:Darli Augusto de Arruda Mello
Support type: Scholarships abroad - Research
FAPESP's process: 15/24517-8 - Photonics for next generation internet
Grantee:Hugo Enrique Hernández Figueroa
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/25537-8 - Distance-adaptive modulation for space-division multiplexed optical systems
Grantee:Ruby Stella Bravo Ospina
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 15/24341-7 - New strategies to confront with the threat of capacity exhaustion
Grantee:Helio Waldman
Support type: Research Projects - Thematic Grants
FAPESP's process: 18/25414-6 - Channel Estimation in Optical Systems with Space-Division Multiplexing
Grantee:Ruby Stella Bravo Ospina
Support type: Scholarships abroad - Research Internship - Doctorate