| 摘要 |
An optical gain equalizer is provided with an erbium doped optical fiber (EDF). The gain equalizer selects two lights out of wavelength division multiplexed light, controls pumping light to EDF based upon the result of the comparison of the levels and flattens the inclination of the gain of the wavelength division multiplexed light. Another optical gain equalizer is provided with EDF and a variable attenuator. The optical gain equalizer selects two lights out of wavelength division multiplexed light and attenuates the wavelength division multiplexed light based upon the result of comparing the levels of the two lights. The power of pumping light to EDF that amplifies wavelength division multiplexed light is controlled based upon this attenuation and the inclination of the gain of the wavelength division multiplexed light is flattened.
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