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1. (WO2018039046) DISTRIBUTED ACOUSTIC SENSING IN AN OPTICAL FIBER USING DISTRIBUTED MODE COUPLING AND DELAY

Pub. No.:    WO/2018/039046    International Application No.:    PCT/US2017/047412
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Fri Aug 18 01:59:59 CEST 2017
IPC: G01M 11/00
G02B 6/14
Applicants: NEC LABORATORIES AMERICA, INC.
Inventors: YAMAN, Fatih
MILIONE, Giovanni
ZHANG, Shaoliang
HUANG, Yue-Kai
Title: DISTRIBUTED ACOUSTIC SENSING IN AN OPTICAL FIBER USING DISTRIBUTED MODE COUPLING AND DELAY
Abstract:
A system and method are provided for distributed acoustic sensing in an optical fiber (300). The system includes a transmitter (2001) for simultaneously propagating a sequence of M light pulses through the optical fiber (300) using a spatial mode selected from a set of N spatial modes provided by a spatial mode selector (200) for the transmitter (2001) that is coupled to an input to the optical fiber (300), with M and N being respective integers greater than one. The system further includes a receiver (2002) for receiving the sequence of M light pulses at an output of the optical fiber (300) and detecting an environmental perturbation in the optical fiber (300) based on an evaluation of a propagation of the sequence of M light pulses through the optical fiber (300).