On the Coexistence of DAS and IMDD Systems on the Same Fiber

The paper experimentally addresses the new interesting topic of the coexistence of DAS signal and DWDM data signals on the same fibre. We demonstrate and characterize how high-peak-power DAS signals can generate significant impairments due to cross-talk arising from modulation instability. However, several solutions are readily demonstrated to significantly reduce the impact on the bit error ratio: employing frequency separations from the DAS channel and narrowband-filter at the data channel receiver, or counter-propagating signals. The work illustrates the key role that signal engineering plays in mitigating of coexistence-induced effects