Method and system for power stability control in wavelength division multiplexing networks
AssigneesNEC Laboratories America, Inc., NEC Corporation
InventorsLei Zong, Ting Wang, Takefumi Oguma, Katsuyuki Mino, Osamu Matsuda
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Abstract
Methods and systems for controlling power fluctuations in a network including a plurality of nodes are disclosed. A node in the network may be configured to modify power levels in accordance with either an active state or an inactive state. The node may transition to an inactive state in response to a power change that exceeds a power change threshold. The role of the node in controlling the power fluctuation in the network is reduced in the inactive state.
Claims18
A method for controlling power fluctuations in a wavelength division multiplexing network having a plurality of nodes comprising:
- modifying a power input of a first node at a modification level to maintain a power output of the first node within a threshold range;
- adjusting the modification level at the first node in accordance with an active state in which the modification level is adjusted in response to determining that a power level at the first node is outside the threshold range;
- in response to determining that a power change over consecutive first time periods at the first node exceeds a first power change threshold, transitioning the first node from an active state to an inactive state in which the modification level is fixed, wherein the transition is made to reduce the time in which the power level at the first node is stabilized within the threshold range;
- and
- wherein the adjustment in the active state reduces the difference between the power level at the first node and a power output level within the threshold range, and wherein the power output of the first node during the transition is outside the threshold range.
A system for controlling power fluctuations in a wavelength division multiplexing network having a plurality of nodes comprising:
- a power modification module configured to modify a power level of at least one signal received by at least one input port of a corresponding node at a modification level to maintain the power level of the at least one signal output by the corresponding node within a threshold range;
- a power monitoring module configured to monitor the power of signals transmitted through at least one port of the corresponding node;
- and
- a control unit configured to control the power modification module by:
- adjusting the modification level in accordance with an active state in which the modification level is adjusted in response to determining via the power monitoring module that the power level of the at least one signal output by the corresponding node is outside the threshold range,
- in response to determining via the power monitoring module that a power change over consecutive first time periods of the at least one signal output by the corresponding node exceeds a first power change threshold, transitioning the corresponding node from an active state to an inactive state in which the modification level is fixed, wherein the transition is made to reduce the time in which the power of the at least one signal output by the corresponding node is stabilized within the threshold range;
- and
- wherein the adjustment in the active state reduces the difference between the power level of the at least one signal output by the corresponding node and a power level within the threshold range, and wherein the power level of the at least one signal output by the corresponding node during the transition is outside the threshold range.
A method for controlling power fluctuations in a wavelength division multiplexing network having a plurality of nodes comprising:
- modifying a power input of a first node at a modification level to maintain the power output of the first node within a threshold range;
- adjusting the modification level at the first node in accordance with an active state in which the modification level is adjusted at a first adjustment degree in response to determining that the power level at the first node is outside the threshold range, wherein the adjustment reduces the difference between the power level at the first node and a power level within the threshold range;
- and
- in response to determining that a power change over consecutive first time periods at the first node exceeds a first power change threshold, transitioning the first node from an active state to an inactive state in which the modification level is adjusted at a second adjustment degree, wherein the magnitude of second adjustment degree is less than the magnitude of the first adjustment degree, wherein the power output of the first node during the transition is outside the threshold range, and wherein the transition is made to reduce the time in which the power output of the first node is stabilized within the threshold range.
Dependencies are inferred from the claim text.