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首页> 外文期刊>Journal of Lightwave Technology >Experimental Demonstration of a Real-Time Digital Filter Multiple Access PON With Low Complexity DSP-Based Interference Cancellation
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Experimental Demonstration of a Real-Time Digital Filter Multiple Access PON With Low Complexity DSP-Based Interference Cancellation

机译：具有低复杂度基于DSP的干扰消除的实时数字滤波器多址PON的实验演示

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A four-channel, upstream, digital filter multiple access (DFMA) passive optical network (PON) is experimentally demonstrated for the first time in a 26 km single mode fiber (SMF) intensity modulation and direct detection system employing realtime optical network units (ONUs) and optical line terminal (OLT), which are dynamically reconfigurable in terms of channel spectral allocation and signal modulation parameters. To combat physical channel frequency response-induced cross channel interference (CCI) between spectrally overlaid orthogonal channels, a real-time, reconfigurable CCI cancellation (CCIC) function implemented in the OLT receiver digital signal processing (DSP), is demonstrated to significantly improve the DFMA PON performance and robustness in terms of significant reductions in total channel bit error rates (BERs) and individual subcarrier BERs, substantial increases in channel capacities, considerably reduced sensitivity to ONU synchronization, and excellent transparency to the interfering channel's signal modulation format. The tradeoff between the complexity of the CCIC function's filter, in terms of tap count (multiplier elements) and the DFMA PONs performance is optimized to determine the optimum tradeoff. It is shown that the CCIC filter only requires as few as 42 taps to achieve excellent CCIC performance. We also fully analyze the DSP complexity of the transmit and receive DFMA filters and the CCIC filters for varying DFMA channel counts and varying ratios of AD/DA converter sample rate to digital logic clock rate (parallelization factor). It is shown that DFMA filter complexity is independent of channel count and furthermore that for channel counts >= 4 the CCIC filter only needs to process similar to 10 interference-inducing samples per wanted signal sample, resulting in only similar to 10 multipliers per parallel filter in the CCIC filter. We have therefore successfully demonstrated an ultra-lowcomplexity, real-time CCIC function, which considerably enhances the performance and robustness of DFMA PONs.
机译：在采用实时光网络单元（ONU）的26 km单模光纤（SMF）强度调制和直接检测系统中，首次通过实验演示了四通道，上游，数字滤波器多址（DFMA）无源光网络（PON） ）和光线路终端（OLT），它们可以根据信道频谱分配和信号调制参数进行动态重新配置。为了应对频谱重叠的正交信道之间的物理信道频率响应引起的跨信道干扰（CCI），已证明在OLT接收机数字信号处理（DSP）中实现的实时，可重新配置的CCI消除（CCIC）功能可显着改善DFMA PON的性能和鲁棒性方面，包括显着降低了总信道误码率（BER）和单个子载波BER，显着提高了信道容量，显着降低了对ONU同步的灵敏度，以及对干扰信道的信号调制格式具有出色的透明性。就抽头数（乘法器元素）而言，CCIC功能滤波器的复杂度与DFMA PONs性能之间的折衷已得到优化，以确定最佳折衷。结果表明，CCIC滤波器只需要多达42个抽头就可以实现出色的CCIC性能。我们还全面分析了发送和接收DFMA滤波器和CCIC滤波器的DSP复杂性，以改变DFMA通道数以及AD / DA转换器采样率与数字逻辑时钟速率（并行因子）的比率。结果表明，DFMA滤波器的复杂度与通道数无关，此外，对于> = 4的通道数，CCIC滤波器仅需要处理与每个所需信号样本相似的10个引起干扰的样本，每个并行滤波器仅类似于10个乘法器。在CCIC过滤器中。因此，我们已经成功演示了超低复杂度实时CCIC功能，该功能大大增强了DFMA PON的性能和鲁棒性。

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