Method for engineering connections in a dynamically reconfigurable photonic switched network
First Claim
1. A method for engineering of a connection in a WDM photonic network with a plurality of flexibility sites connected by links, comprising:
- (a) calculating a physical end-to-end route between a source node and a destination node;
(b) setting-up a data communication path along said end-to-end route;
(c) testing an operational parameter of said data communication path; and
(d) comparing said operational parameter with a margin tolerance and declaring said data communication path as established, whenever said operational parameter is above said margin tolerance.
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Abstract
A method for engineering of a connection in a WDM photonic network with a plurality of flexibility sites connected by links comprises calculating a physical end-to-end route between a source node and a destination node and setting-up a communication path along this end-to-end route. An operational parameter of the communication path is continuously tested and compared with a test threshold. The path is declared established whenever the operational parameter is above the margin tolerance. The established path is continuously monitored by comparing the operational parameter with a maintenance threshold. A regenerator is switched into the path whenever the operational parameter is under the respective threshold, or another path is assigned to the respective connection. An adaptive channel power turn-on procedure provides for increasing gradually the power level of the transmitters in the path while measuring an error quantifier at the destination receiver until a preset error quantifier value is reached. As the connection ages, the power is increased so as to maintain the error quantifier at, or under the preset value. The path operation is controlled using a plurality of optical power/gain control loops, each for monitoring and controlling a group of optical devices, according to a set of loop rules.
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Citations
43 Claims
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1. A method for engineering of a connection in a WDM photonic network with a plurality of flexibility sites connected by links, comprising:
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(a) calculating a physical end-to-end route between a source node and a destination node;
(b) setting-up a data communication path along said end-to-end route;
(c) testing an operational parameter of said data communication path; and
(d) comparing said operational parameter with a margin tolerance and declaring said data communication path as established, whenever said operational parameter is above said margin tolerance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for dynamic engineering of a data communication path in a WDM photonic network with a plurality of flexibility sites connected by links, comprising:
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(a) calculating a physical end-to-end route for connecting a source node and a destination node over said WDM network;
(b) setting-up data communication path along said end-to-end route;
(c) testing an operational parameter of said data communication path; and
(d) comparing said operational parameter with a test threshold and declaring said data communication path as established, whenever said operational parameter is above said test threshold. - View Dependent Claims (12, 13, 14, 16, 17, 19, 20, 21, 22, 25, 26, 27, 28, 29, 30)
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15. A method of switching a data communication path at a node of a photonic network, comprising:
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routing said data communication path from an input port of said node to an output port, whenever an operational parameter of said data communication path is above a threshold; and
OEO processing said data communication path at said node, whenever said operational parameter is under said threshold.
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18. A data communication path for connecting a source node with a destination node along one or more intermediate nodes of a photonic network, said data communication path operating in one of a monitoring mode and a maintenance mode, according to a path operational parameter.
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23. A photonic network for routing a data communication path between a source node and a destination node along a route passing through an intermediate node, comprising:
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a pool of wavelength-converter/regenerators connected at said intermediate node;
a line control system for collecting performance information on said data communication path; and
a network management system for assigning a wavelength-converter/regenerator from said pool to said data communication path and switching said data communication path through said wavelength-converter/regenerator, whenever the performance of said data communication path is outside an operation range.
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24. A method of engineering a connection between two terminals of a dynamically reconfigurable photonic network, comprising:
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setting-up a path whenever an operational parameter of said path is above a test threshold;
operating said path in monitoring mode whenever said operational parameter is above a maintenance threshold; and
servicing said path whenever said operational parameter is under said maintenance threshold.
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31. A method of engineering a connection over a WDM photonic network with a plurality of flexibility sites, comprising:
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selecting a data communication path for said connection based on network topology information, resources specifications and class of service constrains;
turning on a source transmitter, a destination receiver and all transmitters and receivers at all flexibility sites along said path;
increasing gradually the power level of said transmitters while measuring an error quantifier at said destination receiver; and
maintaining the power at said transmitters at a first level corresponding to a preset error quantifier. - View Dependent Claims (32)
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33. A control system for engineering connections in a photonic switched network, with a plurality of wavelength cross-connects WXC connected by links comprising:
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a plurality of control loops, each for monitoring and controlling a group of optical devices, according to a set of loop rules;
a plurality of optical link controllers, each for monitoring and controlling operation of said control loops provided along a link;
a plurality of optical vertex controllers, each for monitoring and controlling operation of said control loops provided at a wavelength cross-connect; and
a network connection controller for constructing a data communication path within said photonic switched network and for monitoring and controlling operation of said optical link controller and said optical vertex controller. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A control system for engineering connections in a photonic switched network, with a plurality of wavelength cross-connects WXC connected by links comprising:
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a plurality of control loops, each for monitoring and controlling a group of optical devices, according to a set of loop rules;
an engineering tool for receiving measurement data and information on said control loop state from each said control loop, importing information on said control loop model from a performance and monitoring database, and providing said control loop with a range for the input signal and a target for the output signal.
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Specification