Optical amplifier

An optical amplifier of a wavelength-division multiplexing transmission system that includes a pre-stage optical amplifying unit and a post stage optical amplifying unit. The pre-stage optical amplifying unit has a rare-earth element doped optical fiber (EDF 1) and a pump light source (LD 1 - 3) for...

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Bibliographische Detailangaben
1. Verfasser:	KINOSHITA SUSUMU,ONAKA MIKI,SUGAYA YASUSHI,OHSHIMA CHIHIRO,CHIKAMA TERUMI,ITOU HIROYUKI,OKIYAMA TADASHI,KOBAYASHI TAIKI
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 MULTIPLEX COMMUNICATION 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 of a wavelength-division multiplexing transmission system that includes a pre-stage optical amplifying unit and a post stage optical amplifying unit. The pre-stage optical amplifying unit has a rare-earth element doped optical fiber (EDF 1) and a pump light source (LD 1 - 3) for inputting a pump light to the rare-earth element doped optical fiber (EDF 1). The post-stage optical amplifying unit has a second rare-earth element doped optical fiber (EDF 2-1, EDF 2-2) and a pump light source (LD 4 - 12) for inputting a pump light to the second rare-earth element doped optical fiber (EDF 2-1). The pre-stage optical amplifying unit and the post-stage optical amplifying unit are optically connected by a detachable optical coupling device. In addition a gain equalizing unit (GEQ 1, GEQ 2), positioned on an output side of the optical fibers, compensates for wavelength-dependency of a gain characteristic of the optical fibers.