The number of wavelengths which are inputted into the optical pre-amplifier in the period of t 2 is The optical amplifier supervisory control method as claimed in claim 18 , wherein said changing of the optical preamplifier from the automatic level control mode to the automatic gain control mode is repeated after each periodic changing of the optical pre-amplifier from the automatic gain control mode to the automatic level control mode. It is thus possible to correct the fluctuation of the connection loss, etc. Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of the channels are varied. In step S 22 , judge whether a normal operation state has been received from the fore node. 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.
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The OSC transmission and receiving circuit calculates the number of wavelengths which are inputted into the WDM apparatus based on that result information, i.
If you are already logged in but arrive at this page, it means you do not have paid access to this content. Method and apparatus for automatically controlling wd signal power in optical transmission systems.
The optical amplifier supervisory control method sdm claimed in claim 19wherein said changing of the optical preamplifier from the automatic level control mode to the automatic gain wmd mode does not occur unless at least one of an input to the optical node and the gain of alx 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.
Equations displayed with MathJax. When the output optical level monitored by the output power monitor falls within tolerable limits of the target output level and is within said range for a specified time, the gain control circuit backs up the sdm gain of that moment in the amplifier gain back-up unit and starts the guard-time timer 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.
The OSC transmission and receiving circuit transmits the number of wavelengths dwm are multiplexed by the WDM apparatus and the normal operation state NOROP information to the transmission path via the supervisory control signal OSC signal: Method and apparatus for optical amplifying device gain control with gain threshold.
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. Also, the fluctuation of the optical loss due to external factors such as an ambient temperature of optical fiber can be corrected by periodically re-adjusting the gain of the optical pre-amplifier in the ALC mode.
If the judgement is NO in step S 25proceed to step S According to the present invention, it is possible to provide an inexpensive optical-amplifier supervisory control method which can automatically carry out gain adjustment and startup.
When the optical amplifier is in routine operation, there is a possibility that the gain for the AGC mode cannot be accurately set if the gain is backed up while the optical amplifier input is fluctuating in the method that when the optical amplifier is started, the optical amplifier is started in the ALC mode in order to correct the loss between the nodes and changed over from the ALC mode to the AGC mode using the gain determined in the ALC mode in order to prevent an error due to the increase or decrease of the wavelengths or a sudden change of the number of optical wavelengths optical level by a path protection switch.
Transmitting device, a communication system, and control method of the transmission level.
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 sdm the optical post-amplifier of the fore node, is started in the automatic level control mode, and stores the optical pre-amplifier gain in the memory after the optical pre-amplifier is started.
Remember me on this computer. To view this article you will need to login or make a payment. 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.
According to this optical amplifier control method, it is possible to automatically set the amplifier gain according to the optical loss between the nodes.
If the optical output level of the fore node fluctuates during the re-adjustment of the gain and deviates from a specified range, or if the number of wavelengths has changed, the optical pre-amplifier output per wavelength fluctuates by returning the optical post-amplifier to the AGC mode using the gain backed up in the back-up ddm, thus preventing an error from being produced to the signal.
Gain control, gain control method of the optical transmission apparatus and an optical amplifier. Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied.
In the path through which an optical signal usually does not pass, like a qdm path, since there is no optical input or output level, the optical amplifier cannot be controlled by ALC or AGC, so the optical amplifier must be kept shutdown.
Index of /pilotes/XLAN/XLAN4/driver/INTEL/I852/SOUND/ALC/WDM
We’ve allc updated our Privacy Notice. 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.
Please contact elec osa. At that time, the gain control circuit backs up the wxm gain backed up by the amplifier gain back-up unit in the back-up unitmonitors the input power of the optical pre-amplifier by the input power monitor qdm, monitors the output power by the output power monitorand controls the optical pre-amplifier in the AGC mode based these monitored values, thus keeping the gain of the optical pre-amplifier constant.
【资料分享】OptiX NG WDM ALC自动光功率控制专题
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. It is thus possible to correct the fluctuation of the connection loss, etc.
The optical-amplifier supervisory control method of the present invention is an optical-amplifier supervisory control method in an optical node including an optical amplifier and an optical post-amplifier, and comprises a step which automatically controls the gain of the optical post-amplifier and a step which starts the optical amplifier, when being started up, by the automatic level control mode, and controls the optical amplifier, when being in routine operation, by automatic gain control, and carries out an automatic level control for every specified period during the routine operation.
The present invention relates to a WDM Wavelength Division Multiplexing transmission apparatus and an optical amplifier control system which are used for a WDM communication network, and more specifically to an optical amplifier control system which supports an optical wavelength ADM add wmd multiplexing function and an optical path protection function in the WDN communication network.
Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of the channels are varied.
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 wrm an error. Systems and methods for detecting fault conditions and detecting and preventing potentially dangerous conditions in an optical system.