| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique which allows for adjustment of the intensity of an optical signal having a predetermined wavelength, even in a state where optical signals of a plurality of wavelengths are superposed.SOLUTION: A measurement section measures the intensity of optical signals of a plurality of wavelengths taken out from a wavelength division multiplexed signal. A transponder receives the optical signals of a plurality of wavelengths thus taken out and outputs the optical signals to the outside, and measures the total intensity of the optical signals of a plurality of wavelengths thus received. Based on the intensity of the optical signals of a plurality of wavelengths measured by the measurement section, and the total intensity of the optical signals of a plurality of wavelengths measured by the transponder, a control section estimates the intensity of one optical signal received by the transponder, and adjusts the intensity of an optical signal of one wavelength thus received. |
