| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength multiple signal optical level flattening circuit, which can be applied to the repeater station of a wavelength multiple signal, by converting the output light of each light attenuator while branching the prescribed ratio, and performing feedback control to the attenuation amount of each correspondent light attenuator so that the output voltage can be a prescribed value. SOLUTION: The input signal light, for which respective signal beams are multiplexed, is divided into signals for each of respective wavelengths λ1-λn by a wavelength dividing part 111 and inputted to light attenuators 121-12n provided for each wavelength. The output light from the light attenuators 121-12n are passed through respective correspondent light branches 131-13n, optically multiplexed again by a wavelength multiplexing part 151 and outputted from an output port 161. The optical outputs of respective light branches 131-13n branching the prescribed ratio among the optical outputs of the respective light attenuators 121-12n are converted into a voltage by optical diodes 141-14n and the feedback control is performed to the attenuation amounts of the respective light attenuators 121-12n corresponding to the respective optical diodes 141-14n so that the output voltage can be the prescribed vague. |
