Optical transmission device for controlling optical level of wavelength multiplexed light and method thereof
AssigneeFujitsu Limited
InventorTakeshi Sakamoto
Life of this patent
Estimating the term…
Abstract
An optical level of each wavelength of a wavelength multiplexed light is monitored and the optical level of each wavelength is adjusted so that the above monitored value gets closer to a target value. Further, an optical level of each wavelength after the coupling of the adjusted lights is monitored, in total. The target value of each wavelength is updated in accordance with the above monitored value.
Claims15
An optical transmission device for transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for compensating for the loss by such media, comprising:
- a storing device for storing a target value of an optical level of each wavelength;
- a first monitoring device for monitoring an optical level of each wavelength;
- an optical attenuating device for adjusting an optical level of each wavelength so that a monitored value of the first monitoring device gets closer to the target value stored in the storing device;
- an optical coupling device for coupling the adjusted light of each wavelength;
- a second monitoring device for monitoring, in total, an optical level of each wavelength after the coupling;
- and
- a controlling device for updating the target value stored in the storing device in accordance with the monitored value of the second monitoring device.
An optical transmission device for transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for compensating for the loss by such media, comprising:
- a storing device for storing a target value of an optical level of each wavelength;
- a monitoring device for monitoring an optical level of each wavelength;
- an optical attenuating device for adjusting an optical level of each wavelength so that a monitored value of the monitoring device gets closer to the target value stored in the storing device;
- an optical coupling device for coupling the adjusted light of each wavelength;
- and
- a controlling device for receiving information of optical signal-noise-ratio obtained by monitoring, in total, optical signal-noise-ratio of each wavelength after the coupling and for updating the target value stored in the storing device in accordance with the received information of optical signal-noise-ratio.
An optical transmission device for transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for conducting automatic gain control to compensate for the loss by such media, comprising:
- a storing device for storing a target value of an optical level of each wavelength;
- a first monitoring device for monitoring an optical level of each wavelength;
- an optical attenuating device for adjusting an optical level of each wavelength so that a monitored value of the first monitoring device gets closer to the target value stored in the storing device;
- an optical coupling device for coupling the adjusted light of each wavelength;
- a second monitoring device for monitoring, in total, an optical level or an optical signal-noise-ratio of each wavelength after the coupling;
- a third monitoring device for monitoring an optical level of a total power after the coupling at the input side or the output side of the optical amplifying device;
- and
- a controlling device for updating the target value stored in the storing device in accordance with the monitored value of the second monitoring device and the third monitoring device.
An optical transmission method of transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for compensating for the loss by such media, wherein:
- monitoring an optical level of each wavelength;
- adjusting an optical level of each wavelength so that the monitored value of the optical level of each wavelength gets closer to the target value;
- coupling the adjusted light of each wavelength;
- monitoring an optical level of each wavelength after the coupling, in total;
- and
- updating the target value in accordance with the monitored value of an optical level of each wavelength after the coupling.
An optical transmission method of transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for conducting automatic gain control to compensate for the loss by such media, wherein:
- monitoring an optical level of each wavelength;
- adjusting an optical level of each wavelength so that the monitored value of the optical level of each wavelength gets closer to the target value;
- coupling the adjusted light of each wavelength;
- monitoring an optical level or an optical signal-noise-ratio of each wavelength after the coupling, in total;
- monitoring an optical level of a total power after the coupling at the input side or the output side of the optical amplifying device;
- updating the target value in accordance with a monitored value of an optical level or an optical signal-noise-ratio of each wavelength after the coupling and the monitored value of an optical level of a total power after the coupling.
An optical transmission device for transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for compensating for the loss by such media, comprising:
- storing means for storing a target value of an optical level of each wavelength;
- first monitoring means for monitoring an optical level of each wavelength;
- optical attenuating means for adjusting an optical level of each wavelength so that a monitored value of the first monitoring means get closer to the target value stored in the storing means;
- optical coupling means for coupling the adjusted light of each wavelength;
- second monitoring means for monitoring, in total, an optical level of each wavelength after the coupling;
- and
- controlling means for updating the target value stored in the storing means in accordance with the monitored value of the second monitoring means.
An optical transmission device for transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for compensating for the loss by such media, comprising:
- storing means for storing a target value of an optical level of each wavelength;
- monitoring means for monitoring an optical level of each wavelength;
- optical attenuating means for adjusting an optical level of each wavelength so that a monitored value of the monitoring means get closer to the target value stored in the storing means;
- optical coupling means for coupling the adjusted light of each wavelength;
- and
- controlling means for receiving information of optical signal-noise-ratio obtained by monitoring, in total, optical signal-noise-ratio of each wavelength after the coupling and for updating the target value stored in the storing means in accordance with the received information of optical signal-noise-ratio.
An optical transmission device for transmitting a wavelength multiplexed light obtained by multiplexing lights of plural wavelengths through an optical transmission line including media with optical loss and optical amplifying devices for conducting automatic gain control to compensate for the loss by such media, comprising:
- storing means for storing a target value of an optical level of each wavelength;
- first monitoring means for monitoring an optical level of each wavelength;
- optical attenuating means for adjusting an optical level of each wavelength so that a monitored value of the first monitoring means get closer to the target value stored in the storing means;
- optical coupling means for coupling the adjusted light of each wavelength;
- second monitoring means for monitoring, in total, an optical level or an optical signal-noise-ratio of each wavelength after the coupling;
- third monitoring means for monitoring an optical level of a total power after the coupling at the input side or the output side of the optical amplifying means;
- and
- controlling means for updating the target value stored in the storing means in accordance with the monitored value of the second monitoring means and the third monitoring means.
Dependencies are inferred from the claim text.