COMMUNICATION SYSTEM AND NORMALCY JUDGMENT METHOD
A communication system includes an instruction device that transmits a loopback instruction for an optical signal; a transceiver device that transmits the optical signal; and a loopback device that loops back the transmitted optical signal to the transceiver device as light based on the loopback instruction. The transceiver device acquires the looped-back optical signal and determines whether a path of the optical signal is normal based on the acquired optical signal. The transceiver device may determine that the path of the optical signal is normal in a case where an attenuation amount of the acquired optical signal is a predetermined attenuation amount. The transceiver device may determine that the path of the optical signal is normal in a case where a time length during which the optical signal is looped back is equal to a predetermined time length.
1 . A communication system, comprising:
an instruction device that transmits a loopback instruction for an optical signal;
a transceiver device that transmits the optical signal; and
a loopback device that loops back the transmitted optical signal to the transceiver device as light based on the loopback instruction,
wherein the transceiver device acquires the looped-back optical signal and determines whether a path of the optical signal is normal based on the acquired optical signal.
2 . The communication system according to claim 1 , wherein the transceiver device determines that the path of the optical signal is normal in a case where an attenuation amount of the acquired optical signal is a predetermined attenuation amount.
3 . The communication system according to claim 1 , wherein the transceiver device determines that the path of the optical signal is normal in a case where a time length during which the optical signal is looped back is equal to a predetermined time length.
4 . The communication system according to claim 1 , wherein the transceiver device determines that the path of the optical signal is normal in a case where an intensity of the acquired optical signal varies at a timing corresponding to the loopback instruction.
5 . The communication system according to claim 1 , wherein the transceiver device determines that the path of the optical signal is normal in a case where a polarization rotation amount of the acquired optical signal is a predetermined polarization rotation amount.
6 . The communication system according to claim 1 , wherein the transceiver device determines that the path of the optical signal is normal in a case where an intensity of the acquired optical signal varies for each wavelength according to a reflectance per wavelength of the optical signal.
7 . A normality determination method executed by a communication system, comprising:
transmitting a loopback instruction for an optical signal;
transmitting the optical signal;
looping back the transmitted optical signal to a transceiver device as light based on the loopback instruction;
acquiring the looped-back optical signal; and
determining whether a path of the optical signal is normal based on the acquired optical signal.