| 摘要 |
<p>A method (10) of controlling optical signal power levelling in an optical communication network node configured to apply an optical attenuation,α, to a pass-through optical signal. The method comprises: a. performing the following steps i. to iii. until an attenuation variation value,Δα, is greater than a preselected attenuation variation threshold value (18),ΔαTH: i. measuring (12) an optical signal power of an optical signal; ii. calculating (14) a difference,ΔΡ, between the measured optical signal power and a target optical signal power; iii. calculating (16) a value for the attenuation variation,Δα, to be applied to the optical attenuation taking account ofΔΡ; b. obtaining (20) a current value of the optical attenuation, an, and obtaining (22) a new optical attenuation value,αn+1, in dependence on the current value of the optical attenuation, a current value of the attenuation variation,Δαn, and at least an earlier value of the attenuation variation,Δαn-1; and c. generating (24) a control signal arranged to configure the node to apply the new optical attenuation value,αn+1 .</p> |
