ALC WDM DRIVER DOWNLOAD
After the amplifier gain is backed up in the back-up unit , and the gain control circuit changes over the operation mode to the AGC mode, the input power monitor detects that the input of the optical pre-amplifier has disappeared there is no wave , and then the gain control circuit shuts down the optical pre-amplifier Also, there is a method in which an optical supervisory channel OSC is provided, the OSC informs each optical amplifier of multiplexed wavelength information, each amplifier changes the target total output level based on this information, and the gain is controlled. If the judgement is YES in step S 22 , start the optical amplifier in the ALC mode in step S 23 , and in step S 24 , judge whether the optical amplifier output level is within a target range for a specified time. Also, the input power of the optical post-amplifier is monitored by the input power monitor , and the output power is monitored by the output power monitor While the next node is receiving the notice of the normal operation state, the optical level which is inputted into the optical pre-amplifier is deemed to be constant, and startup of the optical pre-amplifier is begun. The guard-time timer has a longer time than the time required to process and transfer supervisory control information between the nodes.
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If the judgement is NO in step S 12clear the normal operation state in step S 13and return to step S Also, when the number of wavelengths changes due to the increase or decrease of wavelengths or any impediment, the optical amplifier gain changes little until new information on wavelengths is transmitted from the fore node by taking a long time for the ALC time constant, and the optical pre-amplifier output does not produce such a level fluctuation that gives rise to an error.
Index of /pilotes/XLAN/XLAN4/driver/INTEL/I/SOUND/ALC/WDM
Transmitting device, a communication system, and control method of the transmission level. Method and system for controlling optical amplification in wavelength division multiplex optical transmission.
When the number of optical wavelengths is changed, each amplifier is informed of that information via the OSC. Therefore, when the optical amplifier is started in the ALC mode, it is necessary to keep the optical level which is inputted into wrm optical amplifier constant. It is possible to correct the loss fluctuation between the nodes at all times by continuing the ALC sdm after the optical pre-amplifier is started wsm in the ALC mode.
The optical pre-amplifier is controlled in such a way that the output of the optical pre-amplifier falls within a target output level and becomes constant in the ALC mode. When the wavelength multiplexing number of an optical signal which is inputted in the optical amplifier changes, if the input level of each individual wavelength does not change, the output level of each individual wavelength does not change either because the gain is constant.
The optical-amplifier supervisory control system according to claim 9wherein the serial number of the optical pre-amplifier and the serial number of the shelf in which the optical pre-amplifier is accommodated are stored in the memory, adm when e optical pre-amplifier is started after a power failure has wdk, the serial numbers of the optical pre-amplifier and the shelf are compared with the stored serial numbers of the optical pre-amplifier and the shelf, and when both the serial numbers coincide, the optical pre-amplifier is started in the automatic gain control mode.
Since the optical post-amplifier is operated in the AGC mode, the optical output level is also within a specified range when the optical post-amplifier input is within a specified range. The gain control circuit controls the amplification ratio of EDFA based on the results of having measured the input power monitor which monitors the EDFA input optical level which amplifies light and of having measured the output power monitor which monitors the output optical level.
The gain control circuit controls the optical post-amplifier in the AGC mode based on these monitored values to keep the gain of the optical post-amplifier constant. The optical-amplifier supervisory control system according to claim 11wherein if no gain value is stored in the memory when the optical pre-amplifier transfers from the automatic level control mode to the automatic gain control mode, the output of the optical pre-amplifier is shut down.
If it is judged that the optical input level is within the specified range in step S 12inform the next node of the normal operation state in step 14and return to step S According to the embodiment of the present invention, when the optical amplifier of the WDM network is started, an amplifier starting sequence a pair of the optical post-amplifier of a fore node and the optical pre-amplifier of a next node can be executed independently between each node, and it is not necessary to make an amplifier starting sequence among all the optical amplifiers in the network, thus making it easy to control the startup of the optical amplifier.
If the judgement is NO in step S 24in step S 25judge whether a normal operation state is being continuously received from the fore node.
【资料分享】OptiX NG WDM ALC自动光功率控制专题
Raman optical amplifier, raman optical amplifier adjustment method, program, and information recording medium readable with computer. When the apparatus control unit is replaced while power is off, if a new apparatus control unit was used for another apparatus in the past and the amplifier gain of that apparatus was stored in the back-up unit, using said amplifier gain as it is to control the optical pre-amplifier in the AGC mode makes it impossible to accurately correct the loss between the nodes, thereby possibly causing the main signal to make an error.
In the embodiment of the present invention, the WDM transmission apparatus comprises an optical amplifier, an AGC circuit which carries out automatic gain control, an input power monitor which monitors the input optical level of the optical amplifier, and an OSC transmission and receiving circuit which transmits and receives a supervisory control signal; the next node is informed of the number of optical wavelengths of the optical post-amplifier via the OSC; when the input optical level which is monitored by the input power monitor falls within a specified range and the gain of the optical amplifier falls within a specified range, the next node is informed of a normal wdn state via the OSC; when the input optical level deviates from sdm specified range, the normal operation state is cleared.
Optical transmission system, optical repeating apparatus, and quality supervising method.
(Video) Features of Optical Power Management in WDM Systems_8800_6800_3800
If the judgement is YES in step S 22start the optical amplifier in the ALC mode in step S 23and in step S 24judge whether the optical amplifier output level is within a al range for a specified time.
The optical-amplifier supervisory control method according to claim 2wherein the optical pre-amplifier changes over the operation mode to the automatic level control mode while it is operated in the automatic gain control mode, backs up the gain of that moment when the optical pre-amplifier output falls within a target output range for longer than a specified time, and returns to the automatic gain control mode when a notice of a normal operation state from a fore alf is continuously received for a specified time.
The optical amplifier supervisory control method as claimed in claim 19wherein said changing of the optical preamplifier from the automatic level control mode to the automatic gain control mode does not occur unless at least one of an input to the optical node and the gain of the optical pre-amplifier remains substantially constant for a second predetermined period of time after the output of the optical pre-amplifier falls wit in the target output range for at least the first predetermined period of time.
As has been described, the optical post-amplifier is operated in the AGC mode in the embodiment of the present invention. The number of wavelengths which are inputted into the optical pre-amplifier in the period of t 4 is Optical amplifier, and optical transmission system including the optical amplifier.
Wdn OSC transmission and receiving circuit calculates the number of wavelengths which are inputted into the WDM apparatus based on that result information, i.