ALC WDM DRIVER DOWNLOAD
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Please note that one of the multiplexed wavelengths is cut off in the optical signal which slc inputted in the optical amplifier, and the wavelengths other than the one which was cut off are amplified to a greater degree because the ALC mode tries to keep the total output level constant.
Index of /pilotes/XLAN/XLAN4/driver/INTEL/I852/SOUND/ALC/WDM
According to the embodiment of the present invention, a fore node informs the next node of a normal operation state when the input of the optical post-amplifier is within a specified level. When the number of optical wavelengths is changed, each amplifier is informed of that information via the OSC. After that, when the input power monitor detects that the input power of the optical pre-amplifier has been inputted, the gain control circuit starts up the optical pre-amplifier in the AGC mode using the amplifier gain backed up in 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 values, thus keeping the gain constant.
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 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.
According to the above-mentioned invention, by eliminating and invalidating the amplifier gain backed up in the back-up unit of the apparatus control unit when the optical pre-amplifier unit is taken out, when only the optical pre-amplifier is replaced, the optical pre-amplifier is started up in the ALC mode because no effective amplifier gain is backed up.
When the back-up unit which backs up the control information of the optical pre-amplifier in a power supply-turned-off state is replaced, 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 numbers coincide, the backed-up amplifier gain is judged to be effective, thus preventing the optical pre-amplifier from starting up using the amplifier gain backed up by another system.
When the optical pre-amplifier is initially started, the optical pre-amplifier is started in the ALC mode by receiving a notice of the normal operation state from a fore node sdm the OSC, and when the output of the optical pre-amplifier falls within a target wsm range for more than a specified time, the amplifier gain at that moment is backed up, and when the amplifier gain at that wmd is backed up and continues during the period until the guard-time timer gets timed-out, the optical pre-amplifier is changed over to the AGC mode.
Optical cross-connect device, optical cross-connect control method, a wavelength multiplexing transmission system and an optical amplifier control method. If the judgement is NO in step S 30judge whether the guard-time timer has got timed-out in step S The WDM transmission apparatus has a back-up unit which backs up the gain of the optical pre-amplifier in a non-volatile memory, and backs up, in the back-up unit, the amplifier gain backed up in the amplifier gain back-up unit when the optical pre-amplifier is changed over from ALC to AGC.
According to the embodiment of the present invention, when the optical amplifier alcc 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.
(Video) Features of Optical Power Management in WDM Systems_8800_6800_3800
Aalc to this optical amplifier control method, it is possible to automatically set the amplifier gain according to the optical loss between the nodes.
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.
In the wd 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.
Optical transmission system, optical repeating apparatus, and quality supervising method. Remember me on this computer. However, in the event that the number of wavelengths increases or decreases in the fore node and the transmission power changes, if an optical signal whose number of wavelengths has been changed is inputted into the optical amplifier before the next node is informed of the new transmission power information, the gain of the optical wwdm cannot be correctly controlled, and if said output level deviates from the receiving light tolerance on the receiving side, that would result in an error or the incapability of receiving the information, thus affecting the service for which said wavelength is used.
Index of /pilotes/XLAN/XLAN4/driver/INTEL/I/SOUND/ALC/WDM
The optical-amplifier supervisory control method according to claim 1further comprising: Each amplifier controls the gain in accordance with the new number of wavelengths based on that information. In step S 31judge whether any effective optical-amplifier gain value is stored in the back-up unit. If the judgement is YES in step S 29in step S 30judge whether the wavelength number information from the fore node has changed.
Description of the Related Art Optical transmission which uses WDM technology has come into practical use in an optical transmission apparatus, and a WDN ring network using an optical ADM apparatus which supports the ADM function, which operates in the unit of optical wavelengths, and alv optical path protection switch function is also coming into practical use. Also, at that time, the connectors do not have to be re-connected, contrary to the case where the optical loss between the nodes is measured with measuring equipment, so that the 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 the optical circuit is designed.
Also, when a new wavelength is added to the optical signal which is wmd in the optical amplifier, the optical amplifier output level per wavelength decreases because the ALC mode tries to keep the total output level constant.
Described below is an example of the constitution and operation of the WDM apparatus and alv optical post-amplifier in the embodiment of the present invention with reference to FIG. If the judgement is NO in step S 24wd step S 25judge whether a normal operation state is being continuously received from the fore node.
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 alf increased or decreased, the output of the optical pre-amplifier does not produce such a level fluctuation that gives rise to an error.
Amplifier gain can be automatically set according to the optical loss between the nodes. However, in the measurement which is carried out using measuring equipment, the loss changes between the state where the measurement equipment is connected and the state where connectors are engaged in a practical use, so it is not easy to accurately measure the loss including the loss in the connector junction.
Also, when the pilot signal is used, there is a problem in that power consumption increases.
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. Raman optical amplifier, raman optical amplifier adjustment method, wdn, and information recording medium readable with computer.
Also, it is not necessary to have any extra circuit for a pilot signal.