Patent ID: 6646796
Filing Date: 2003-11-11
Classification: H01S

Abstract:
A wide band optical amplifier, comprising:a first erbium-doped fiber amplifier stage (S1) pumped by a first pump light source; a second erbium-doped fiber amplifier stage (S2) pumped by a second pump light source; a split section disposed between said first S1 said second S2 for amplified signal light that enter said split section into a first sub-band and a second sub-band, wherein said second sub-band is forwarded to said S2; a reflector for reflecting the amplified output of said S2 back into said second S2 and said first S1 in a reverse direction; and, a combiner for combining said reflected output from said second S2 and said first S1 and said first sub-band to produce an output signal.