Patent · US Active

High loss loop back for long repeater span

US8009983B2 · kind B2 · utility

11Cited by
5References
20Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJun 26, 2008
Grant dateAug 30, 2011
Priority date—
Expiry dateNov 14, 2029

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04B10/035
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

Various high loss loop back (HLLB) repeater architectures are disclosed that enable selectively monitoring (e.g., measuring, analyzing, etc) of Rayleigh signals from both inbound and outbound directions of an optical communication system. In one such embodiment, first and second optical test signal frequencies (or ranges) are used, in conjunction with selective filtering, for monitoring the outbound and inbound paths, respectively. The repeater architectures allow optical time domain reflectometry (OTDR) monitoring techniques to be employed, for example, in particularly long repeater spans, such as those in excess of 90 km in length.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.