公开(公告)号：US10211920B1

公开(公告)日：2019-02-19

申请号：US15698356

申请日：2017-09-07

Applicant: Amazon Technologies, Inc.

Inventor： Salman Khaleghi ,  Emily Abbess ,  Alaa Adel Mahdi Hayder ,  Matthew Connolly

IPC: H04B10/2525 ,  H04B10/071 ,  H04B10/079 ,  H04Q11/00 ,  H04J14/02

Abstract: Optical communication systems include optical time domain reflectometers that are coupled to link fibers to determine link fiber lengths. After length measurement, chromatic dispersion associated with the measured length is estimated. In some examples, the estimated chromatic dispersion is compensated. A single OTDR can be used to assess a pair of link fibers coupling first and second network nodes by injecting a probe pulse at a common end of the link fibers or by routing the probe pulses from a remote end of one link fiber into a remote end of a second fiber.

公开(公告)号：US10432302B1

公开(公告)日：2019-10-01

申请号：US15633707

申请日：2017-06-26

Applicant: Amazon Technologies, Inc.

Inventor： Edgard Alberto Delgado ,  Kevin Giblin ,  Sean Smyth ,  Matthew Connolly

IPC: H04B10/071 ,  H04B10/073 ,  G01M11/00 ,  H04B10/40 ,  H04J14/02

Abstract: Optical fiber communication systems include monitor filters that permit OTDR or other monitoring signals to co-propagate or counter-propagate on link fibers. OTDR measurements are periodically triggered, and acquired OTDR signatures are compared with store signatures to locate faults. The monitor filter can be used in single direction, dual OTDR bidirectional, or signal OTDR bidirectional (loopback) monitoring.