Patent ID: 6975450
Filing Date: 2005-12-13
Classification: H01S

Abstract:
1. A wide band erbium-doped fiber amplifier with a gain enhancement comprising: a first fiber amplifier adapted to amplify C-band components of an input optical signal; a second fiber amplifier connected to the first fiber amplifier in series while being disposed downstream from the first fiber amplifier, and adapted to amplify L-band components of the input optical signal; a C/L splitter disposed between the first and second fiber amplifiers, and adapted to split the amplified C and L-band optical signals to flow along different paths; a fiber reflector disposed downstream from the second fiber amplifier, and adapted to reflect the amplified L-band optical signal to flow backwards toward the second fiber amplifier; a circulator disposed between the C/L splitter and the second fiber amplifier, and adapted to guide the amplified L-band optical signal, reflected to flow backwards by the fiber reflector, so that the amplified L-band optical signal flows along a path different from that of optical signals applied to the circulator; and a C/L combiner adapted to combine the amplified C-band optical signal split by the C/L splitter with the amplified L-band optical signal guided by the circulator, and to apply the resultant optical signal to an output stage.