Method for detecting a check-back signal in an optical...

Details Method for detecting a check-back signal in an optical... Method for detecting a check-back signal in an optical...

2011-04-05

2011-04-05

Li, Shi K (Department: 2613)

Optical communications

Diagnostic testing

Test signal

C398S021000, C398S030000, C398S032000

Reexamination Certificate

active

07920787

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.

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Giammarco Rossi, Timothy E. Dimmick and Daniel J. Blumenthal, “Optical Performance Monitoring in Reconfigurable WDM Optical Networks Using Subcarrier Multiplexing”, Journal of Lightwave Technology, IEEE, New York, US, vol. 18, No. 12, Dec. 2000, pp. 1639-1648, XP002179167.

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