(Optical Society of America, 2010) Zornoza Indart, Ander; Pérez Herrera, Rosa Ana; Elosúa Aguado, César; Díaz Lucas, Silvia; Bariáin Aisa, Cándido; Loayssa Lara, Alayn; López-Amo Sáinz, Manuel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
We propose a novel concept for hybrid networks that combine
point and distributed Brillouin sensors in a cost-effective architecture that
also deploys remote distributed Raman amplification to extend the sensing
range. A 46-km proof-of-concept network is experimentally demonstrated
integrating point vibration sensors based on fiber Bragg gratings and tapers
with distributed temperature sensing along the network bus. In this network
the use of Raman amplification to compensate branching and fiber losses
provides a temperature resolution of 0.7°C and 13 m. Moreover, it was
possible to obtain good optical signal to noise ratio in the measurements
from the four point vibration sensors that were remotely multiplexed in the
network. These low-cost intensity sensors are able to measure vibrations in
the 0.1 to 50 Hz frequency range, which are important in the monitoring of
large infrastructures such as pipelines.
