| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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 Opportunities: | Scholarships abroad - Research |
| FAPESP's process: | 15/24517-8 - Photonics for next generation internet |
| Grantee: | Hugo Enrique Hernández Figueroa |
| Support Opportunities: | 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 Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 15/24341-7 - New strategies to confront with the threat of capacity exhaustion |
| Grantee: | Helio Waldman |
| Support Opportunities: | 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 Opportunities: | Scholarships abroad - Research Internship - Doctorate |