US 12,111,204 B2
Extending dynamic acoustic sensing range and localization in undersea cables using loopbacks
Alexei N. Pilipetskii, Colts Neck, NJ (US); Maxim A. Bolshtyansky, Millstone, NJ (US); Dmitri G. Foursa, Colts Neck, NJ (US); Georg Heinrich Mohs, East Brunswick, NJ (US); and Jin-Xing Cai, Morganville, NJ (US)
Assigned to SubCom, LLC, Eatontown, NJ (US)
Filed by SUBCOM, LLC, Eatontown, NJ (US)
Filed on May 20, 2022, as Appl. No. 17/749,420.
Claims priority of provisional application 63/213,978, filed on Jun. 23, 2021.
Claims priority of provisional application 63/210,775, filed on Jun. 15, 2021.
Prior Publication US 2022/0397448 A1, Dec. 15, 2022
Int. Cl. G01H 9/00 (2006.01); G01D 5/353 (2006.01)
CPC G01H 9/004 (2013.01) [G01D 5/35361 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a DAS interrogator to launch an outbound DAS signal;
an outbound signal path for transmitting the outbound DAS signal over at least one outbound optical fiber;
a plurality of outbound amplifiers, coupled along the outbound signal path, and separated from one another by a distance defining a span;
a return signal path for conducting a plurality of return DAS signals based upon the outbound DAS signal, over a return optical fiber;
a plurality of return amplifiers, coupled along the return signal path, and separated from one another by a distance defining a span;
a plurality of loopbacks, to reroute the outbound DAS signal between the outbound signal path and the return signal path, to form the plurality of return DAS signals; and
a loopback component, arranged in at least one loopback of the plurality of loopbacks, to regulate transmission of a return DAS signal from the loopback to the DAS interrogator.