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AssigneeAlcatel
InventorsArnaud Bisson, Alice Michaud, Emmanuel Rossi, Guy Balland
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An optical system dynamically measures power loss in an optical fiber (2) having an entry end (E) adapted to receive optical signals and an exit end (S) adapted to deliver the signals. The system comprises modulation means (4) upstream from the entry end (E) and adapted to modulate the amplitude of the optical signals with a low-frequency modulation signal having a modulation index inversely proportional to the input power (Pe) of the optical signals, and detection means (7) downstream from the exit end (S) and adapted to extract from the modulated optical signals primary information representative of the output amplitude of the modulation signal and to deduce from the primary information secondary information representative of a variation in the power loss in the fiber.
An optical system for dynamically measuring power loss in an optical transmission line including at least one optical fiber (2) having an entry end (E) adapted to receive optical signals and an exit end (S) adapted to deliver said signals, which system is characterized in that it comprises modulation means (4) upstream from said entry end (E) and adapted to modulate the amplitude of said optical signals with a low-frequency modulation signal having a modulation index (Ind Mod) inversely proportional to the input power (Pe) of the optical signals, and detection means (7) downstream from said exit end (S) and adapted to extract from said modulated optical signals primary information representative of the output amplitude of the modulation signal and to deduce from said primary information secondary information representative of a variation in the power loss in the fiber (2).
A method of dynamically measuring power loss in an optical transmission line comprising an optical fiber (2) having an entry end (E) adapted to receive optical signals and an exit end (S) adapted to deliver said signals, which method is characterized in that the amplitude of said optical signals is modulated with a low-frequency modulation signal having a modulation index inversely proportional to the input power (Pe) of the optical signals, and then i) primary information representative of the output amplitude of the modulation signal is extracted from said modulated signals, and ii) secondary information representative of a variation in the power loss in the fiber (2) is deduced from said primary information.
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