Analog/digital double automatic power controlling device in an o

Details Analog/digital double automatic power controlling device in an o Analog/digital double automatic power controlling device in an o

1998-08-21

2000-02-29

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359124, H01S 300

Patent

active

060316608

ABSTRACT:
There is provided a device for automatically the output of a pump laser diode used as an excitation light source in an erbium doped fiber amplifier (EDFA). The automatic power controlling device can stabilize an optical signal output via a final output terminal in an optical fiber amplifier by selecting a first feedback control loop using an output photodiode or a second feedback control loop using a photodiode provided in a pump laser diode, and controlling an optical excitation signal output from the pump laser diode on the basis of the intensity of an output optical signal detected through the selected feedback control loop in an analog or digital double automatic controlling method.

REFERENCES:
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5633750 (1997-05-01), Nogiwa et al.
patent: 5673129 (1997-09-01), Mizrahi
patent: 5703711 (1997-12-01), Hamada
patent: 5768012 (1998-06-01), Zanoni et al.
patent: 5912760 (1999-06-01), Sugiya
patent: 5923462 (1999-07-01), van der Plaats

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