Hitless reconfiguration of a wavelength division multiplexed optical communication network
First Claim
1. A method of reconfiguring a wavelength-division multiplexed communication network comprising a plurality of nodes linked by a plurality of optical channels each carrying a plurality of optical signals at different respective optical wavelengths, said method comprising the steps of:
- a first step of determining a first wavelength allocation for a first configuration of said network;
a second step of determining a second wavelength allocation for a second configuration of said network that does not conflict with said first wavelength allocation; and
at a beginning of a transition from said first configuration to said second configuration assigning all new connections according to said second wavelength allocation.
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Abstract
A method of reconfiguring a multi-wavelength communication network. The transition includes determining the union of the old and new topologies. During at least the start of the transition, the network supports the union topology. New connections are connected according to the new topology, and the old topology, as its connections expire, is gradually removed. In allocating wavelengths to a new topology, two algorithms are developed which assign wavelengths which do not color clash with the wavelength assignments of the old topology.
50 Citations
16 Claims
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1. A method of reconfiguring a wavelength-division multiplexed communication network comprising a plurality of nodes linked by a plurality of optical channels each carrying a plurality of optical signals at different respective optical wavelengths, said method comprising the steps of:
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a first step of determining a first wavelength allocation for a first configuration of said network; a second step of determining a second wavelength allocation for a second configuration of said network that does not conflict with said first wavelength allocation; and at a beginning of a transition from said first configuration to said second configuration assigning all new connections according to said second wavelength allocation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hitless reconfiguration method of transitioning from a first topology of a wavelength-division multiplexed network to a second topology thereof, comprising the steps of:
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forming a union of said first and second topologies, thereby forming a union topology; during at least a part of a transition period configuring said network according to said union topology; and at the end of said transition period configuring said network according to said second topology. - View Dependent Claims (12)
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- 13. A method of allocating optical wavelengths to an optical wavelength in a wavelength-division multiplexed optical communication network, said network having been allocated a first set of wavelengths to first links thereof according to a first topology and a first wavelength allocation thereof and requiring to be allocated a second set of wavelengths to second links thereof according to a second topology, said method comprising allocating such second set of wavelengths that do not clash along common ones of said first and second links.
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15. An optical network, comprising:
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an optical fabric including optical fiber and reconfigurable wavelength-selective optical switching elements to form selective optical links across said fabric; more than two nodes having electronic switching elements and receiving multi-wavelength optical signals from said fabric and transmitting multi-wavelength optical signals to said fabric; and a controller executing an algorithm for controlling said fabric and said nodes including the steps of a first step of determining a first wavelength allocation for a first configuration of said fabric and said nodes, a second step of determining a second wavelength allocation for a second configuration of said fabric and said nodes that does not conflict with said first wavelength allocation, and at a beginning of a transition from said first configuration to said second configuration assigning all new connections according to said second wavelength allocation. - View Dependent Claims (16)
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Specification