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Also, when the pilot signal is used, wdn is a problem in that power consumption increases. If the judgement is NO in step S 26proceed to step S First, in step S 10start the optical post-amplifier, and in step S 11judge whether the optical amplifier gain is within a specified range.
Access To view this article you will need to login or make a payment. The optical-amplifier supervisory control system according to claim 10wsm comprising: If the judgement is NO in step S 29proceed to step S It is possible to correct the loss fluctuation between the nodes at all times by continuing the ALC mode after the optical pre-amplifier is started up in the ALC mode.
The monitor detects whether there is any optical input of each individual wavelength, and informs the OSC transmission and receiving circuit of the result.
(Video) Features of Optical Power Management in WDM Systems_8800_6800_3800
It is possible to correct the change of optical loss due to external factors such as an ambient temperature of an optical fiber by re-adjusting the optical pre-amplifier gain in the ALC mode periodically. Amplifier gain can be automatically set according to the optical loss between the nodes. If the judgement is NO, wait until it is received. Also, since it is unnecessary to change the connection of the connectors, contrary to such a case where the optical loss between the nodes is measured using measurement equipment, wddm optical loss including the loss in the connector junction can be accurately measured, thus making it unnecessary to take an wdj loss margin into consideration when designing optical circuits.
The optical-amplifier supervisory control method according to claim 3wherein 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 a gain value is not stored in the memory.
【资料分享】OptiX NG WDM ALC自动光功率控制专题
alcc 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. When the apparatus control unit which backs up the control information of the optical pre-amplifier apc a power supply-turned-off state is replaced, if the gain which has been set in another system is backed up in the back-up unit, the serial numbers of the optical pre-amplifier unit and the shelf are compared with the serial numbers of the backed up optical pre-amplifier unit and the shelf, and only when these values coincide, the backed-up amplifier gain is judged to be effective, thus enabling the optical pre-amplifier to be prevented from starting up due to a wrong setting of the gain.
When the optical output level of the fore node fluctuates during the startup of the optical pre-amplifier in the ALC mode, it is possible to prevent the optical pre-amplifier from starting wdmm with a wrong gain value by shutting down the optical pre-amplifier. There is another function of the gain control circuit The optical-amplifier supervisory control system according to claim 9wherein the serial number of the wmd pre-amplifier and the serial number of the shelf in which the optical pre-amplifier is accommodated are stored in the memory, and when e optical pre-amplifier is started after a power failure has occurred, the aoc 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.
If the judgement is YES in step S 25in step S 26judge whether wavelength number information from the fore node has changed.
Method and apparatus for optical amplifying device gain control with gain threshold. Therefore, when the optical amplifier is started in the ALC mode, it is necessary to keep the optical level which is inputted into the optical amplifier constant. An optical-amplifier supervisory control method in an optical node including an a,c pre-amplifier and an optical post-amplifier, comprising: At that time, the gain control circuit backs up the amplifier gain backed up in the amplifier gain back-up unit wxm the back-up unitmonitors the input power of the optical pre-amplifier by the input power monitormonitors the output power by the output power monitorand controls the optical pre-amplifier in the AGC mode based on these monitored aoc, thereby keeping akc gain of the optical pre-amplifier constant.
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. The purpose of the present invention is to provide an inexpensive optical-amplifier supervisory control method which can automatically carry out gain adjustment and startup.
Even if the number of wavelengths or the output of the optical post-amplifier of the fore node fluctuates due wcm the increase and decrease of the number of wavelengths, etc. In the method wherein the optical pre-amplifier is started in the ALC mode, and is changed over to the AGC mode using the gain determined by the ALC mode while it is in routine operation, the gain for the AGC mode can be accurately set when the optical level inputted into the optical amplifier wrm being operated in the ALC mode is constant.
If wm have arrived on this page from an external web site and wish to view the article abstract first, click on the link below. If no effective amplifier gain is backed up, the gain control circuit starts the optical pre-amplifier in the same method as that of starting the optical pre-amplifier in its initial state i.
Gain control, gain control method of the optical transmission apparatus and an optical amplifier. In the optical pre-amplifier which has two control modes, ALC and AGC, when the optical pre-amplifier is re-started after a power failure occurs and is restored to a normal state, if an effective gain value of the optical amplifier is backed up, the optical pre-amplifier is controlled in the AGC mode and re-started using the backed-up amplifier gain; if an effective gain value of the optical amplifier is not backed up, the optical pre-amplifier is re-started in the ALC mode.
In order to prevent this, when power is turned on, the amplifier gain as well as the serial numbers written on the non-volatile memory and for the optical pre-amplifier unit and the shelf respectively are compared with those in the back-up unitand only when both factors coincide, the amplifier gain backed up in the back-up unit is judged to be effective, and the optical pre-amplifier is started up using the backed-up amplifier gain.
Click here to learn more. Transmitting device, a communication system, and control method of the transmission level. Another control method of the optical amplifier has an optical pre-amplifier which has two control modes, ALC and AGC, a memory unit which backs up amplifier gain, and an OSC transmission and receiving circuit which transmits and receives a supervisory control signal; a longer time is taken for the ALC time constant than the time required to process and transfer the supervisory control signal between the nodes; the optical pre-amplifier is started in the ALC mode by receiving a notice of a normal operation state from a fore node via the OSC; when the output of the optical pre-amplifier falls within a target output range for more than a specified time, the amplifier gain of that moment is backed up.
The OSC transmission and receiving circuit informs the gain control circuit of the number of wavelengths out of these pieces of information.