Patent · US Active

Method for detecting a check-back signal in an optical transmission system

US7920787B2 · kind B2 · utility

99Cited by

3References

18Claims

0Family size

Assignee

Nokia Siemens Networks GmbH & Co. KG · DE

Inventors

Guido Gentner · Munich, DE
Rene Neumann · Usingen, DE
Gerhard Thanhäuser · Mering, DE

Key dates

Filing date	Apr 1, 2003
Grant date	Apr 5, 2011
Priority date	—
Expiry date	Jan 7, 2027

Classification

Technology area (CPC H)Electricity
CPC primaryH04B2210/08
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

The invention relates to a method for detecting a check-back signal in a transmission system for optical signals. According to said method, a constant proportion of the output in a defined frequency range of the check-back signal is concentrated in a narrow-band spectral range and is determined after a transmission phase by means of a narrow-band detection of the concentrated energy around the spectral range. If no signal is identified during the narrow-band detection, a line interruption is determined and no pump source is switched on for safety reasons. The narrow-band detection of the check-back signal also allows the transmission attenuation of the transmission system to be measured.

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