| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical amplifier which copes with various input light intensity conditions.SOLUTION: The optical amplifier including at least input monitoring means 3, optical amplifying means 6, and control means 10 for performing amplification control of the optical amplifying means by using the input monitoring means is characterized by performing gain control according to high-level and low-level input light intensities. |
