| 摘要 |
PROBLEM TO BE SOLVED: To provide a DWDM transmission system for absorbing an uncontrollable optical output power difference by a function block without spreading a light receivable range of a light reception part at a final step. SOLUTION: An optical signal transmitted via optical amplification parts 3-1 to 3-4 is input to an optical wavelength division 4 at a terminal of a transmission path, and the optical wavelength division 4 returns it to each wave with respect to one fiber, to be input to optical reception parts 5-1 to 5-5 for reception. The optical reception parts 5-1 to 5-5 directly monitor a current flowing a photodiode for use in transmitting a main signal, to be converted from a current to a voltage, and then a CPU processes as information transmitting data to transmit it to the optical amplification parts 3-1 to 3-4 as light receiving power information. This constitutes a loop control of the optical amplification parts 3-1 to 3-4, which change an amplification degree with respect to a wavelength to adjust to come to a light receiving power standard range of the optical reception parts 5-1 to 5-5. |
