Self-stimulation signal detection in an optical transmission sys

Details Self-stimulation signal detection in an optical transmission sys Self-stimulation signal detection in an optical transmission sys

1996-01-18

1999-01-12

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, 359177, H04B 1008

Patent

active

058597166

ABSTRACT:
In an apparatus and method for troubleshooting a transmission system comprising optical line amplifiers (OA), optical reflections can be detected irrespective if a data signal is present or absent. Each OA is equipped with a self-stimulation signal detection unit for generating a low frequency local code unique to the transmission system and dithering the outgoing signal in a controlled manner with the local code. Each OA attempts to detect its local code in the incoming signal by comparing the energy of the transmitted and received dithers. The presence of the local code in the incoming signal initiates alarms which unequivocally identify the faulted OA. Each OA selects its local code out of a bank of local codes, according to a priority scheme and re-selects its local code in case of conflicts.

REFERENCES:
patent: 5513029 (1996-04-01), Roberts
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"Frequency Domain Optical Reflectometer", R.I. MacDonald, Applied Optics, vol.20, No.10, pp. 1840-1844, May 1981.
"High Spatial Resolution OTDR Attenuation Measurements by a Correlation Technique", M. Zoboli et al, Applied Optics, vol. 22, No. 23, pp. 3680-3681, Dec. 1983.

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