We describe a quasi-all-optical extension dedicated to simplifying the deployment of submarine cabled observatories. Based on power-over-fiber technologies, high power supply and data are both transmitted in one optical fiber of a few kilometers in length. We study the Raman amplification on the down-and upstream data in the static regime with the high optical power varying from 100 mW to 4 W over a 10 km long single-mode optical fiber. We focus on the data optical budget and signal to noise ratio dependence with respect to the high optical power value and the data optical wavelength. We also present the transmission quality in the dynamic regime of this quasi-all-optical extension.
demodulation are not necessary. This leads to a much simple and cost-effective IC design with minimum RF feature. Moreover, the electrical self-mixing is also simultaneously used in the system, and it eliminates the need for high-frequency microwave source at the CS and local oscillator at the BS. The system architecture configuration is simplified and the cost budget is reduced. The proposed scheme shows the promising attraction of DMT modulation and self-mixing for 64QAM-OFDM signals application in future optical millimeter-wave access networks.
Due to the relative low propagation speed of acoustic waves in underwater medium, Underwater Acoustic (UWA) communication is severely impacted by Doppler shift effect especially as the transmission link is related to a system in motion like an Autonomous Underwater Vehicle (AUV). Usually, motioninduced Doppler-shift needs to be estimated and compensated at the UWA receiver side in order to retrieve data. This estimation also provides an information on transmitter/receiver relative speed that is valuable for an underwater mobile like an AUV to perform underwater localization and navigation. In this paper, we consider a reference anchor transmitting UWA data to an AUV in operation. The latter uses UWA communication decoding process to estimate both range and relative speed with respect to the reference point in order to improve its navigation via a conventional Kalman filtering. Simulation results on a shallow water channel demonstrate the Doppler shift estimation to provide substantial enhancement of the underwater localization with respect to a range-only approach.
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