Optical communication device and control method
One mode of the present invention is an optical communication device that includes: a detector that detects the falling edge or the rising edge of a control signal outputted from a user device to an optical communication path; and an optical modulator that superimposes a new control signal on a main signal, when the falling edge or the rising edge of a control signal has been detected by the detector.
1 . An optical communication device comprising:
a detector that detects a falling edge or a rising edge of a control signal outputted from a user device to an optical communication path; and
an optical modulator that superimposes a new control signal on a main signal, when a falling edge or a rising edge of a control signal has been detected by the detector.
2 . The optical communication device according to claim 1 , wherein
when a time from detection of the falling edge of the control signal by the detector to superimposition of the new control signal by the optical modulator is indicated as T A ,
when an interval at which the user device transmits the control signal is indicated as T B , and
when a transmission time of the control signal is indicated as T C ,
the optical modulator is configured to generate the new control signal so as to satisfy T A ≤(T B −T C )/2, and is configured to superimpose the generated new control signal on the main signal.
3 . The optical communication device according to claim 1 , wherein the optical modulator comprises:
an uplink-signal optical modulator that superimposes a new control signal on an uplink main signal which was output to a first optical communication path, and
a downlink-signal optical modulator that superimposes a new control signal on a downlink main signal which was output to a second optical communication path.
4 . The optical communication device according to claim 1 , further comprising
a setter that sets a wavelength to be used by the user device for communication with another connection destination; and
a connection destination switcher that switches connection destinations of the user device,
wherein,
when the user device starts communication with a desired connection destination, the connection destination switcher connects the user device and the desired connection destination via the optical modulator, and,
when the user device switches from the desired connection destination to the another connection destination and starts communication, the optical modulator superimposes the new control signal, on the main signal, for setting the wavelength set by the setter.
5 . The optical communication device according to claim 1 , further comprising
a setter that sets a wavelength to be used by the user device for communication with another communication destination; and
a connection destination switcher that switches connection destinations of the user device,
wherein,
the user device is connected to the connection destination switcher via the optical modulator provided for each user device,
when the user device starts communication with a desired connection destination, the connection destination switcher connects the user device and the desired connection destination, and,
when the user device switches from the desired connection destination to the another connection destination and starts communication, the optical modulator superimposes the new control signal, on the main signal, for setting the wavelength set by the setter.
6 . The optical communication device according to claim 2 , wherein the optical modulator comprises:
an uplink-signal optical modulator that superimposes a new control signal on an uplink main signal which was output to a first optical communication path, and
a downlink-signal optical modulator that superimposes a new control signal on a downlink main signal which was output to a second optical communication path.
7 . A control method comprising:
detecting a falling edge or a rising edge of a control signal outputted from a user device to an optical communication path; and
superimposing a new control signal on a main signal, when a falling edge or a rising edge of a control signal has been detected in the detection step.