Optical amplifier apparatus

An optical amplifier apparatus using an optical amplifying fiber including a working laser and a stand-by laser for firing pumping light to the optical amplifying fiber through an optical coupler, a signal light monitor unit which splits off part of the output signal light of the optical amplifying...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HARASAWA, SHINICHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DEVICES USING STIMULATED EMISSION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSMISSION
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Beschreibung
Zusammenfassung:	An optical amplifier apparatus using an optical amplifying fiber including a working laser and a stand-by laser for firing pumping light to the optical amplifying fiber through an optical coupler, a signal light monitor unit which splits off part of the output signal light of the optical amplifying fiber by the optical coupler and monitors the same, a drive current monitor unit which monitors the drive current of the working laser, and a supervisory unit which judges that the working laser has deteriorated or there is a fault in the driver circuit of the working laser and switches from the working laser to the stand-by laser to generate the pumping light when the monitor output signal of the drive current monitor unit rises or falls beyond a predetermined range and the monitor output signal of the signal light monitor unit falls below a predetermined value. The level of the output signal light is also referred to in judging the deterioration of the laser for generating the pumping light.