Patent ID: 7034997

Claim:
A wideband optical fiber amplifier configured for amplifying S-band optical signals, C-band optical signals and L-band optical signals, said amplifier comprising: a circulator having first, second, and third ports, said circulator outputting a plurality of optical signals into said second port that were input into the first port, and said circulator also outputting an amplified spontaneous emission (ASE) and S-band optical signals to a third port that were input into said second port of said circulator; at least one optical fiber grating for passing the C- and L-band optical signals from among the plurality of optical signals outputted from the second port of the circulator configured for reflecting the S-band optical signals from among the optical signals outputted from the second port of the circulator back to the second port of the circulator, and outputting the ASE inputted into an interior of the optical fiber grating to the second port of the circulator; an outputting unit having at least four terminals configured for outputting optical signals inputted into first to third terminals to a fourth terminal; a wavelength selective splitter having first, second and third ports configured for being connected the second terminal of the outputting unit; outputting the L-band optical signals of the optical signals inputted into said first port to the second port of the splitter and configured for the C-band optical signals of the optical signals inputted into a first port to the third port, the third port of the wavelength selective splitter a first optical fiber amplifying unit connected with the optical fiber grating and the first port of the wavelength selective splitter, configured for amplifying the C- and L-band optical signals and for outputting the ASE to the optical fiber grating; a second optical fiber amplifying unit configured for the L-band optical signals inputted from the second port of the wavelength selective splitter and for outputting the amplified L-band optical signals to the third terminal of the outputting unit; and a third optical fiber amplifying unit configured for the S-band optical signals inputted from the third port of the circulator and for outputting the amplified S-band optical signals to the first terminal of the outputting unit.