| 摘要 |
Disclosed is an optical amplifier which is smaller in power consumption and number of component parts, simpler in structure, and rid of wavelength dependency of gain against the variation of input light power and temperature. The optical amplifier has a characteristic information table which stores data of a proper curve indicative of the relation between the pumping light power and output light power of the optical amplifying medium at a constant gain tilt of wavelength-multiplexed signal light, and a pumping light controller which controls the pumping power such that the output light power and pumping light power of the optical amplifying medium are related to lie on the proper curve.
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