By utilizing digital orthogonal filtering (DOF) in the digital domain, we report, for the first time, experimental demonstrations of aggregated 30.078Gb/s/λ transmissions of DOF-multiplexed spectrally-overlapped and/or frequency gapless six channels over IMDD PON systems incorporating off-the-shelf and low-cost 10G-class optical devices. Experimental results show that simple adaptive channel power loading implemented in the digital domain enables very similar transmission performances of individual channels regardless of their locations in the digital filter space. As a direct result of the interplay between the transmission system-associated negative chromatic dispersion and the intensity modulation-induced frequency chirp, negative power penalties of >0.2dB are experimentally observed for all the involved channels under various transmission system configurations. In addition, excellent performance robustness of the demonstrated systems is also obtainable for various transmission distances up to 45km.

中文翻译：

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使用10G级光学设备在IMDD PON系统上进行30Gb / s /λ数字正交滤波多路传输的实验演示

通过在数字域中利用数字正交滤波（DOF），我们首次报告了IMDD PON系统上DOF复用频谱重叠和/或无频隙的六个信道的合计30.078Gb / s /λ传输的实验演示集成了现成的低成本10G级光学设备。实验结果表明，在数字域中实现的简单自适应信道功率负载，无论单个信道在数字滤波器空间中的位置如何，都可以实现非常相似的传输性能。作为与传输系统相关的负色散与强度调制引起的频率线性调频之间相互作用的直接结果，> 0的负功率损失。在各种传输系统配置下，对于所有涉及的信道，实验观察到2dB。此外，对于长达45 km的各种传输距离，还可以获得演示系统的出色性能鲁棒性。