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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]
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Database: Engineering Source
Description
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]
ISSN:10685200
DOI:10.1016/j.yofte.2020.102329