| 摘要 |
A gain equalizer for compensation a variation of intensity among a plurality of optical signals each including a different wavelength in a wavelength multiplexed optical signal includes an input part for receiving the wavelength multiplexed optical signal, an outputting part and a gain equalizing unit for repeatedly giving a loss to the wavelength multiplexed optical signal received by the input part, and for outputting the wavelength multiplexed optical signal to the outputting part. Here, the loss is set for each wavelength and is smaller than a loss characteristic required for compensation the variation of intensity.
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