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Baseband linearity and interference effects in intensity modulated and direct detected optical MIMO systems.

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Title: Baseband linearity and interference effects in intensity modulated and direct detected optical MIMO systems.
Authors: Sandmann, André1,2 (AUTHOR) andre.sandmann@hs-wismar.de, Ahrens, Andreas1 (AUTHOR), Lochmann, Steffen1 (AUTHOR), Pachnicke, Stephan2 (AUTHOR)
Source: Optical Fiber Technology. Dec2020, Vol. 60, pN.PAG-N.PAG. 1p.
Subjects: MIMO systems, Baseband, Nonlinear systems, Linear systems, Bit error rate
Abstract: • Received signals are composed of a desired linear signal and an interference signal. • Systems with weak and no mode cross-talk can be considered as linear in baseband. • Systems with high mode cross-talk are impaired by interference. In short reach intensity modulated and direct detected (IM/DD) optical multiple-input multiple-output (MIMO) systems linear equalization strategies are commonly applied. However, the square-law detector inherently is a non-linear system element. This work investigates this discrepancy and shows for which laser types and under which mode coupling conditions baseband linearity applies for the first time. Based on a system model that integrates a multitude of aspects, e.g. the phase state of each fiber mode and mode coupling, it is shown that the received signal consists of a linear component and one that can be considered as interference. The simulation and measurement results highlight that only MIMO setups with weak and no mode cross-talk can be considered as linear. Systems with high mode cross-talk are impaired by significant interference, resulting in a highly degraded bit-error rate performance. [ABSTRACT FROM AUTHOR]
Copyright of Optical Fiber Technology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 147318752
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  Data: Baseband linearity and interference effects in intensity modulated and direct detected optical MIMO systems.
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  Data: <searchLink fieldCode="JN" term="%22Optical+Fiber+Technology%22">Optical Fiber Technology</searchLink>. Dec2020, Vol. 60, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22MIMO+systems%22">MIMO systems</searchLink><br /><searchLink fieldCode="DE" term="%22Baseband%22">Baseband</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+systems%22">Nonlinear systems</searchLink><br /><searchLink fieldCode="DE" term="%22Linear+systems%22">Linear systems</searchLink><br /><searchLink fieldCode="DE" term="%22Bit+error+rate%22">Bit error rate</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Received signals are composed of a desired linear signal and an interference signal. • Systems with weak and no mode cross-talk can be considered as linear in baseband. • Systems with high mode cross-talk are impaired by interference. In short reach intensity modulated and direct detected (IM/DD) optical multiple-input multiple-output (MIMO) systems linear equalization strategies are commonly applied. However, the square-law detector inherently is a non-linear system element. This work investigates this discrepancy and shows for which laser types and under which mode coupling conditions baseband linearity applies for the first time. Based on a system model that integrates a multitude of aspects, e.g. the phase state of each fiber mode and mode coupling, it is shown that the received signal consists of a linear component and one that can be considered as interference. The simulation and measurement results highlight that only MIMO setups with weak and no mode cross-talk can be considered as linear. Systems with high mode cross-talk are impaired by significant interference, resulting in a highly degraded bit-error rate performance. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Optical Fiber Technology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.yofte.2020.102329
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: MIMO systems
        Type: general
      – SubjectFull: Baseband
        Type: general
      – SubjectFull: Nonlinear systems
        Type: general
      – SubjectFull: Linear systems
        Type: general
      – SubjectFull: Bit error rate
        Type: general
    Titles:
      – TitleFull: Baseband linearity and interference effects in intensity modulated and direct detected optical MIMO systems.
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            NameFull: Ahrens, Andreas
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            NameFull: Lochmann, Steffen
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            – D: 01
              M: 12
              Text: Dec2020
              Type: published
              Y: 2020
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              Value: 60
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            – TitleFull: Optical Fiber Technology
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