Optical signal monitor, optical wavelength multiplexing transmitter, and method for monitoring optical signal
An optical signal monitor, including: a storage that holds a threshold value set for each of determination areas having a bandwidth set in accordance with an average grid of dummy light; a measurement section that sequentially measures an optical intensity of an inputted wavelength-multiplexed optical signal with respect to each of measurement areas obtained by dividing the determination area into areas with a bandwidth sufficiently smaller than a grid width of a monitoring-target optical signal composing the wavelength-multiplexed optical signal, and output measured values; and a section that determines that dummy light corresponding to the determination area needs introducing if each of measured values in the determination area is smaller than a threshold value, and, determines that dummy light corresponding to the determination area does not need introducing if at least one of the measured values in the determination area is equal to or larger than the threshold value.
1 . An optical communication apparatus comprising:
a wavelength multiplexer means for outputting a multiplexed optical signal;
a monitor means for monitoring an intensity of an optical signal in the multiplexed optical signal; and
a controller means for controlling a dummy light using the monitored intensity and at least one of a plurality of threshold values, the plurality of threshold values including different threshold values assigned to different wavelength bands.
2 . The optical communication apparatus according to claim 1 , wherein the controller means is further configured for controlling the dummy light using the monitored intensity and a first threshold value assigned to a first wavelength band, and
wherein the first wavelength band includes a wavelength of the optical signal.
3 . The optical communication apparatus according to claim 1 , wherein the controller means is further configured for controlling the dummy light using the monitored intensity and a first threshold value assigned to a first wavelength band, and for controlling a second dummy light using the monitored intensity and a second threshold value assigned to a second wavelength band, and
wherein the first wavelength band and the second wavelength band include a wavelength of the optical signal.
4 . The optical communication apparatus according to claim 1 , wherein the monitor means is further configured to monitor the intensity of the optical signal at an interval that is less than the wavelength band.
5 . The optical communication apparatus according to claim 4 , wherein the monitor means is further configured for outputting a monitored intensity at each monitored interval, and
wherein the controller means is further configured for controlling the dummy light using the output monitored intensity and the at least one of the plurality of threshold values assigned to the wavelength band corresponding to the monitored intensity.
6 . The optical communication apparatus according to claim 4 , wherein the interval is variable.
7 . The optical communication apparatus according to claim 1 , wherein the controller means is further configured for controlling the dummy light using the monitored intensity and the at least one of the plurality of threshold values assigned to a first wavelength band, the first wavelength band including a wavelength of the dummy light.
8 . The optical communication apparatus according to claim 1 , wherein a wavelength width of the optical signal is variable.
9 . The optical communication apparatus according to claim 1 , wherein the multiplexed optical signal further includes a second optical signal, and
wherein the second optical signal has a second wavelength width, the second wavelength width being different than a wavelength width of the optical signal.
10 . An optical communication control method comprising:
outputting, using an optical wavelength multiplexer, a multiplexed optical signal;
monitoring, using an optical signal monitor, an intensity of an optical signal in the multiplexed optical signal; and
controlling, using a controller, a dummy light using the monitored intensity with respect to measurement areas and at least one of a plurality of threshold values, the plurality of threshold values including at least two different threshold values assigned to different wavelength bands.
11 . The optical communication control method according to claim 10 , further comprising controlling the dummy light using the monitored intensity and a first threshold value assigned to a first wavelength band, and the first wavelength band includes a wavelength of the optical signal.
12 . The optical communication control method according to claim 10 , further comprising controlling the dummy light using the monitored intensity and a first threshold value assigned to a first wavelength band, and controlling a second dummy light using the monitored intensity and a second threshold value assigned to a second wavelength band, and the first wavelength band and the second wavelength band include a wavelength of the optical signal.
13 . The optical communication control method according to claim 10 , further comprising monitoring the intensity of the optical signal at an interval that is less than the wavelength band.
14 . The optical communication control method according to claim 13 , wherein the interval is variable.
15 . The optical communication control method according to claim 13 , further comprising:
outputting a monitored intensity at each monitored interval; and
controlling the dummy light using the output monitored intensity and the at least one of the plurality of threshold values assigned to the wavelength band corresponding to the monitored intensity.
16 . The optical communication control method according to claim 10 , further comprising controlling the dummy light using the monitored intensity and the at least one of the plurality of threshold values assigned to a first wavelength band, the first wavelength band including a wavelength of the dummy light.
17 . The optical communication control method according to claim 10 , wherein a wavelength of the optical signal is variable.
18 . The optical communication control method according to claim 10 , wherein the multiplexed optical signal further includes a second optical signal, and
wherein the second optical signal has a second wavelength width, the second wavelength width being different from a wavelength width of the optical signal.