Patent ID: 6392788
Filing Date: 2002-05-21
Classification: H01S,H04B

Abstract:
An optical fiber amplifier comprising:a first optical fiber doped with erbium and phosphorous, for amplifying signal light excited by the erbium; a second optical fiber connected to one end of the first optical fiber, doped with erbium and aluminum, and having a gain spectrum slope opposite to the first optical fiber according to population inversion of the erbium, for amplifying signal light output by the first optical fiber; a pumping laser source connected to another end of the first optical fiber, for exciting the erbium of the first and second optical fibers; and a light coupler for coupling pumping light from the pumping laser source to the signal light and outputting the resultant light to the first optical fiber; and a buffer fiber for connecting the light coupler to the first optical fiber to reduce splice loss between the first optical fiber and the light coupler, said buffer fiber having a short length characterized in that said buffer fiber does not effect the gain flatness of the optical fiber amplifier.