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首页> 外文期刊>Journal of Lightwave Technology >Solutions for 100/400-Gb/s Ethernet Systems Based on Multimode Photonic Technologies
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Solutions for 100/400-Gb/s Ethernet Systems Based on Multimode Photonic Technologies

机译：基于多模光子技术的100 / 400-Gb / s以太网系统解决方案

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In this paper, we experimentally demonstrate the transmission of 112 Gb/s four-level pulse amplitude modulation over 100-m OM4 multimode fiber employing a multimode 850-nm vertical-cavity surface-emitting laser (VCSEL) at the transmitter side and equalization techniques at the receiver's digital signal processing (DSP). The penalties imposed by the strong bandwidth limitations due to the optical components as well as the low modal bandwidth of the fiber are compensated by three variant DSP schemes at the receiver, i.e., 1) a finite-impulse response (FIR) filter, 2) a maximum likelihood sequence estimation equalizer (MLSE), and 3) an FIR filter followed by an MLSE equalizer (FIR/MLSE) in a cascaded form. We evaluate all three aforementioned equalization schemes under two different transmitter implementations, i.e., employing a 30-GHz arbitrary waveform generator and a lower bandwidth 15-GHz commercially available digital-to-analog converter and we infer about the applicability of each DSP scheme under these implementations. We show that the hybrid implementation of an FIR followed by a 16-state MLSE can enable the 100-m transmission below the 7% hard decision (HD) forward error correction (FEC) threshold limit and outperforms its other two counterparts for the back-to-back case as well as after 100-m transmission for the high-bandwidth transmitter implementation. On the other hand, lower bandwidth DAC implementations, i.e., 15 GHz, require an increased state MLSE without the need for a preceding FIR filter to bring the bit error rate (BER) below the HD-FEC limit after 100-m OM4 fiber transmission. DSP complexity versus BER performance is assessed for all the aforementioned scenarios evaluating the impact of the transmitter's bandwidth on the overall system's performance. Our proposed solutions show that 112 Gb/s 100-m OM4 multimode links based on VCSELs and standard OM4 fiber can enable next generation 100 and 400 Gb/s wavelength division multiplexed optical interconnects.
机译：在本文中，我们通过发射机端采用多模850 nm垂直腔面发射激光器（VCSEL）并通过均衡技术实验性地演示了100 m OM4多模光纤上的112 Gb / s四级脉冲幅度调制的传输在接收器的数字信号处理（DSP）。由于光学组件的强带宽限制以及光纤的低模态带宽而造成的损失可以通过接收器处的三种变型DSP方案来补偿，即：1）有限脉冲响应（FIR）滤波器； 2）最大似然序列估计均衡器（MLSE），以及3）FIR滤波器，然后是级联形式的MLSE均衡器（FIR / MLSE）。我们在两种不同的发射机实现下评估了所有上述三种均衡方案，即采用30 GHz任意波形发生器和较低带宽的15 GHz市售数模转换器，并推断出每种DSP方案在这些方案下的适用性实现。我们显示，FIR与16状态MLSE的混合实现可以在7％硬决策（HD）前向纠错（FEC）阈值限制以下实现100 m传输，并且在后向性能方面优于其他两个同类产品对于高带宽发射机的实现，以及在100 m传输之后的情况。另一方面，较低带宽的DAC实现（即15 GHz）需要增加状态MLSE，而无需使用先前的FIR滤波器以在100 m OM4光纤传输后使误码率（BER）低于HD-FEC限制。针对上述所有情况，评估了DSP复杂度与BER性能的关系，评估了发射机带宽对整体系统性能的影响。我们提出的解决方案表明，基于VCSEL和标准OM4光纤的112Gb / s 100-m OM4多模链路可以实现下一代100和400Gb / s波分复用光学互连。

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