| 摘要 |
<p>Provided is an optical fiber for amplification for use in L-band, in which optical fiber the increase of transmission loss and the degradation of hydrogen-resistant characteristic can be restrained. An optical fiber amplifier including such optical fiber for amplification is also provided. The optical fiber for amplification is basically made of silica glass and comprises: a core region doped with erbium and P element of 2 wt% to 5 wt% concentration, Ge not being added thereto; and a cladding region enclosing the core region and doped with F element, wherein the optical fiber has a gain of optical amplification at least in a wavelength range of 1570 to 1620 nm. The optical fiber amplifier comprises: an optical fiber of the present invention; a pump light source for outputting the pump light capable of exciting a rare-earth element added to the core region of the optical fiber for amplification; and an optical coupler for introducing into the optical fiber for amplification the pump light having been output from the pump light source.</p> |
