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Baseband linearity and interference effects in intensity modulated and direct detected optical MIMO systems
Optical Fiber Technology ( IF 2.7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.yofte.2020.102329
André Sandmann , Andreas Ahrens , Steffen Lochmann , Stephan Pachnicke

Abstract 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.

中文翻译:

强度调制和直接检测光 MIMO 系统中的基带线性度和干扰效应

摘要 在近程强度调制和直接检测 (IM/DD) 光学多输入多输出 (MIMO) 系统中,普遍采用线性均衡策略。然而,平方律检测器本质上是一个非线性系统元件。这项工作调查了这种差异,并显示了基带线性首次适用于哪些激光器类型以及在哪些模式耦合条件下。基于集成了多个方面的系统模型,例如每个光纤模式和模式耦合的相位状态,表明接收信号由一个线性分量和一个可以被视为干扰的分量组成。仿真和测量结果突出显示,只有具有弱模式串扰和无模式串扰的 MIMO 设置才能被认为是线性的。
更新日期:2020-12-01
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