| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of causing signal degradation accompanying reduction of the optical signal level with respect to the noise level, which results from the fact that the stimulation light power after multi-stage connection is consumed also for the amplification of the noise of the spontaneous emission light (ASE: Amplified Spontaneous Emission), causing reduction of the stimulation power to be contributed to the optical amplification of the optical signal 8 and increase of the ASE 7 component of 1.560μm which is the noise component. SOLUTION: An erbium-doped optical fiber amplifier optically amplifies an optical signal of 1.550-1.560μm wavelength in an optical fiber by inputting the optical signal and stimulation light into an erbium-doped optical fiber, wherein the inversion is given to 50-65% of erbium ions in the optical fiber. Thereby, the problem can be solved. COPYRIGHT: (C)2005,JPO&NCIPI |
