| 摘要 |
A multiplexing/demultiplexing unit demultiplexes an input light according to a wavelength, and multiplexes a plurality of wavelength components from a plurality of semiconductor optical amplifiers into a multiplexed light. A control unit performs a gain control for each of the semiconductor optical amplifiers. A receiving unit receives an optical signal after performing the gain control for each of a plurality of semiconductor optical amplifiers belonging to each subscriber-side apparatus, based on each of the wavelength components included in the multiplexed light.
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