Patent ID: 6867912
Filing Date: 2005-03-15
Classification: H01S,H04B

Abstract:
1. A wide-band erbium-doped fiber amplifier, comprising: a first optical fiber amplifier for amplifying input C-band (Conventional band) optical signals; a second optical fiber amplifier connected to a downstream end of the first optical fiber amplifier in series for amplifying input L-band (Long band) optical signals; a C/L splitter arranged between the first and second optical fiber amplifiers for splitting the amplified C and L-band optical signals; a gain flattening filter for flattening gains of the amplified C-band optical signals split by the C/L splitter; an optical reflector arranged downstream from the first optical fiber amplifier for backward-reflecting the amplified L-band optical signals split by the C/L splitter to the second optical fiber amplifier; a circulator for circulating the amplified L-band optical signals backward-reflected from the optical reflector; and a C/L combiner for combing and outputting the amplified C-band optical signals split by the C/L splitter and gain-flattened by the gain flattening filter and the amplified L-band optical signals circulated by the circulator.