Patent ID: 11920975
Assignee: NEC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A distributed optical fiber sensing/distributed acoustic sensing system comprising:
a length of bi-directional optical fiber cable having multiple spans of fibers with inline optical amplifiers positioned after each span, said cable configured such that at least one fiber propagates light in a first direction and at least one fiber propagates light in a second direction, said second direction counter-propagating opposite to the first direction;
a distributed optical fiber sensing/distributed acoustic sensing interrogator in optical communication with the length of bi-directional optical fiber cable including a fiber that propagates light in the first direction and a fiber that propagates light in the second direction;
an intelligent analyzer configured to analyze DFOS sensing data received by the DFOS interrogator system; and
one or more repeaters located at point(s) along the length of the optical fiber cable, said repeaters including a plurality of Rayleigh combine units (RCUs) and a plurality of Rayleigh drop units (RDUs).