Optical fiber amplifier and optical amplification method
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Dec 10, 1997
filing date -
Dec 11, 1996
priority date (Note) -
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Abstract
An optical amplifier includes an erbium doped fiber of which at least one of a core part and a clad part is doped with erbium, excitation light sources or exciting the optical fiber, optical means for inputting excitation light from the excitation light source and signal light to the Er-doped fiber, and an optical isolator. The erbium doped fiber is a 1.58 .mu.m band optical fiber having an equivalent fiber length as a product of a fiber length (m) and an erbium doping concentration (ppm by weight), which length provides a signal gain obtained at a wavelength of the excitation light source used for excitation of the erbium doped fiber of more than a predetermined practical reference value.
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