Line monitoring of an optical transmission system using pilot si

Details Line monitoring of an optical transmission system using pilot si Line monitoring of an optical transmission system using pilot si

1997-06-10

2000-02-15

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359160, 359174, 359162, 359110, H04B 1016, H04B 1000

Patent

active

060259493

ABSTRACT:
An optical transmission system allows for the remote determination of the total output power of each repeater. The optical transmission system includes two terminals, an optical path that transmits a plurality of optical signals between the two terminals, and a plurality of repeaters spaced along the optical path. In each of the repeaters, pilot signals are inserted by impressing them upon the amplified optical signals output from the repeater. The pilot signals are derived from an oscillator whose frequency is unique to the repeater in which the pilot signals are inserted. The magnitude of each pilot signal is proportional to the output power of its associated repeater. Each terminal provides a measurement of the total power output from each repeater using a receiving device. The receiving device selects the unique oscillator frequency for each of the repeaters desired to be measured, and measures the pilot signals at the selected frequency.

REFERENCES:
patent: 5083874 (1992-01-01), Aida et al.
patent: 5436746 (1995-07-01), Hirst
patent: 5436750 (1995-07-01), Kawano
patent: 5440418 (1995-08-01), Ishimura et al.
patent: 5668658 (1997-09-01), Hamada
patent: 5719693 (1998-02-01), Tanoue
patent: 5790294 (1998-08-01), Horiuchi et al.
patent: 5818629 (1998-10-01), Kinoshita

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