Patent ID: 8548321

Claim:
An optical transmission apparatus for transmitting wavelength division multiplexed signal light, the optical transmission apparatus comprising a unit including: a first branching section which branches the signal light into first signal light and second signal light; a first detection section which detects operating wavelength light included in the first signal light; a second detection section which detects an optical supervisory channel signal included in the first signal light; a first connection section connected to a first component including a third detection section that receives the first signal light and detects the optical supervisory channel signal included in the first signal light; a second connection section connected to a second component that receives the second signal light; a second branching section which is disposed at a subsequent stage of the second connection section and which branches the second signal light output from the second component into third signal light and fourth signal light; a fourth detection section which detects an optical supervisory channel signal included in the third signal light; a fifth detection section which is disposed at a preceding stage of an amplifier unit that amplifies the fourth signal light and which detects operating wavelength light included in the fourth signal light; and a control unit which monitors a state of the optical transmission apparatus on a basis of detection results obtained by the first detection section, the second detection section, the third detection section, the fourth detection section, and the fifth detection section.