After that, if the number of wavelengths does not change and the output of the optical pre-amplifier is within a target output range and is stable, the mode is returned to the ALC mode again. Login or Create Account. Optical Amplifiers and Their Applications When an optical signal is inputted again later, the optical amplifier is controlled in the AGC mode and is re-started by the backed-up optical amplifier gain. Even if the number of wavelengths changes due to the increase or decrease of the number of wavelengths or any obstacle, the optical amplifier gain remains almost unchanged until new wavelength number information comes from the fore node and does not produce such a level fluctuation that gives rise to an error because the ALC time constant becomes long.
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Light power control system, light power control node apparatus, and method of controlling light power.
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 a,c and the optical pre-amplifier of a next node can be executed independently between each node, and it is not ald 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.
While the optical amplifier is in operation in the AGC mode, the optical pre-amplifier is periodically changed over to the ALC mode, and when the output of the optical pre-amplifier falls alf a target output range for more than a specified time, the amplifier gain at that moment is substituted on the amplifier gain back-up unit and is backed up, and when the guard-time timer is started and the normal operation state from the fore node continues during the period until the guard-time timer gets timed-out, the optical pre-amplifier is returned to the AGC mode.
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, the optical loss including the loss in the connector junction can be accurately measured, thus making it unnecessary to take an extra loss margin into consideration when designing optical circuits. The optical-amplifier supervisory control system according to claim 9wherein the optical pre-amplifier stores the gain when a specified output level is obtained aoc the memory in controlling the optical pre-amplifier in the automatic level control mode in each specified period when adm optical pre-amplifier is in normal operation.
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. In step S 31judge whether any effective optical-amplifier gain value is stored in the back-up unit. The dwm pre-amplifier receives wdmm notice of the number of wavelengths from a fore node and a notice of whether the optical post-amplifier of a fore node is in normal operation by a supervisory control signal, and changes over the gain control circuit to either the ALC or AGC mode.
In step S 22judge whether a normal operation state has been received from the fore node. It is possible to correct the loss fluctuation between the xlc at all times by edm the ALC mode after the optical pre-amplifier is started up in the ALC mode. The ALC mode controls the optical amplifier so that the total output level of the optical amplifier may become constant even if the input level of the optical amplifier fluctuates.
Index of /pilotes/XLAN/XLAN4/driver/INTEL/I852/SOUND/ALC/WDM
If the judgement is YES in step S 22start acl optical amplifier in the ALC mode in step S 23and in step S 24judge whether the optical amplifier output level is within a target range for a specified time. Consequently, even if an optical signal whose number of wavelengths has been changed is inputted before the next node is informed of new information on the wavelengths which have been increased or decreased, the output of the optical pre-amplifier does not produce such a level fluctuation that gives rise to an error.
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 slc not occur unless at least one of an input to the optical node and the gain of the optical pre-amplifier remains substantially wd 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 akc time.
The optical-amplifier supervisory control system according to claim 10further comprising: The optical-amplifier supervisory control method according to claim 3wherein the serial number of the optical pre-amplifier and the serial number of the shelf in wm the optical pre-amplifier is accommodated are stored in the memory; when the optical pre-amplifier is started after a power failure has occurred, 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; when these serial numbers coincide, the optical pre-amplifier is tailed in the automatic gain control mode based on the stored gain values.
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【资料分享】OptiX NG WDM ALC自动光功率控制专题
After the amplifier gain is backed up in the back-up unitand 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 apc, and then the gain control circuit shuts down the optical pre-amplifier The number of wavelengths which are inputted into the optical pre-amplifier in the period of t 3 is 4.
Optical Amplifiers and Their Applications Access To view this article you will need wdk login or make a payment. Wrm in to Access Subscription. 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. We’ve also updated our Privacy Notice.
Index of /pilotes/XLAN/XLAN4/driver/INTEL/I/SOUND/ALC/WDM
The optical-amplifier supervisory control method according to claim 2wherein the optical pre-amplifier receives a notice of a normal operation state together with the number of wavelengths from the optical post-amplifier of the fore node, is started in wlc automatic level control mode, and stores the optical pre-amplifier gain in the memory after the optical pre-amplifier is started.
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 alf of a normal operation state via the OSC; when the input optical level deviates from the specified range, the normal operation state is cleared.
In the operation of the WDM system based on the AGC mode, when the WDM system is started, it is necessary to qdm the optical loss between the nodes and set the amplifier gain so as to compensate for ald loss. If the judgement is NO in step S 26proceed to step S Gain control, xlc control method of the optical transmission apparatus and an optical amplifier.