Patent ID: 6903868
Filing Date: 2005-06-07
Classification: H01S

Abstract:
1. A wideband Er-doped fiber amplifier comprising: (a) a first Er-doped fiber provided with a first light-pumping source via a first pump combiner to amplify input optical signals; (b) a second Er-doped fiber provided with a second light-pumping source via a second pump combiner to amplify input L-band optical signals; (c) a C/L splitter disposed between the first Er-doped fiber and the second Er-doped fiber for splitting optical signals passing there-through into C- and L-bands; (d) a reflector for reflecting the L-band optical signals outputted from the second Er-doped fiber back toward the second Er-doped fiber; (e) a circulator disposed between the first Er-doped fiber and the C/L splitter for forwarding the reflected L-band output signals received therein to another direction and for preventing backward flow of ASE generated by the first Er-doped fiber; and, (f) a C/L combiner for combining the C-band optical signal outputted from the C/L splitter and the reflected L-band optical signals forwarded by the circulator.