Investigation of Crosstalk between Data Signals and Feed Light in Power-over-Fiber

Abstract

In power-over-fiber systems, simultaneous data signals and power transmission using a single optical fiber is an attractive step towards simplifying the systems. However, when simultaneously transmitting data signals and feed light in a single core, the transmission quality of the data signal degrades owing to the crosstalk based on the characteristics of the feed light source. In this study, we investigate and evaluate the crosstalk between the data signal and high-power feed light in a power-over-fiber system. To observe the effect of the crosstalk more clearly, we use a power-over-fiber link using a single-core, conventional multimode fiber, and a high-power Raman fiber laser as the feed light source. Consequently, it is found that the feed light induces relative intensity noise related to the longitudinal mode beating and mode partition noise determined by the characteristics of the laser. In addition, it depends on the input power and transmission distance, and has a significant impact on the quality of the data signal by the noise transfer. To evaluate these noises quantitatively, we also evaluate the error-vector-magnitude and bit-error-rate characteristics of analog and digital data signals, which show that similar characteristics are observed.