Amplification tree structure technique for optical fiber sensor array

摘要

Sagnac fiber optic sensor array, reduces the dispersion of the pickup lead down the fiber by using a common delay path folding. The sensor array is used to detect (for example, such as sound waves in water) perturbation. By basing the operating principles similar to the Sagnac interferometer and Sagnac sensor array is folded, and a bias point that is stable and and has a phase noise is reduced, the sensor array, the laser narrow more expensive linewidth it is possible to use a broadband source, rather than requiring. Can be multiplexed into the architecture of the sensor array multiple sensors. In a particularly preferred embodiment of one sensor array is constructed by the amplifier and the coupler is selected to direct the individual sensors in the array equal portions substantially of the input optical signal. In a particularly preferred alternative embodiment, delay the first and second paths are provided for the light of the first and second wavelengths, I increase the dynamic range of the sensor.