OPTICAL WAVELENGTH MULTIPLEXING DEVICE, OPTICAL TRANSMISSION DEVICE, AND ABNORMALITY DETERMINATION METHOD

• Main Authors: Tochigi Takumi, EJIMA Kota, YOSHIMURA Satoshi, Yoshimi Makoto, Yamakami Masahiro
• Format: Patent
• Language: English
• Published: 20.10.2016
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; MULTIPLEX COMMUNICATION; TRANSMISSION

An optical wavelength multiplexing device includes: a wavelength selective switch including a first input port for receiving an optical signal, a second input port for receiving a monitoring signal, output ports for outputting the optical signal or the monitoring signal, and an adjustment unit that adjusts a level of the optical signal or the monitoring signal at one of the output ports; a measurement unit that measures an output level of the monitoring signal at one of the output ports; and a control unit that specifies an unused output port of the output ports as a monitoring target port; sets a specific adjustment amount to the monitoring target port; outputs the monitoring signal to the monitoring target port; and determines whether the monitoring target port has an abnormality, based on the output level at the monitoring target port and an estimated output level at the monitoring target port.