Methods and apparatus for passive access subnetwork
A technology for accessing subnets and connecting to, applied in multiplexing communications, wavelength division multiplexing systems, optical multiplexing systems, etc., to reduce complexity and cost, reduce complexity and accompanying cost, maintain The effect of flexibility
Inactive Publication Date: 2015-02-25
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology
A transport network that optically aggregates different services by transporting those services on different wavelength channels would be advantageous for a number of reasons, but has so far been inhibited by long deployment cycles of equipment, organizational boundaries, and operator considerations
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[0027] figure 1 A general layered architecture for an optical transport network configured to transport wavelength division multiplexed (WDM) traffic using different wavelength channels is shown. The lowest layer shown, Layer 1, is the access network 12 comprising a plurality of access subnetworks 14-1, 14-2, . . . 14-K. Each access subnetwork 14 - k is formed of a plurality of access subnetwork nodes 16 interconnected via optical fibers 18 . As shown for access subnets 14-1 and 14-2, when nodes 16 of access subnet 14 are interconnected in a ring configuration, access subnet 14 is referred to as a ring access subnet. The ring access subnetwork provides resiliency in this respect against failure of access subnetwork nodes 16 and failure of fibers 18 . Nodes 16 of access subnet 14 may of course be interconnected using other structures, including tree structures (as shown for access subnet 14-K), bus structures, mesh structures, or any combination thereof.
[0028] Typically, ...
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An access subnetwork node herein comprises one or more add-drop modules, each module including one or more passive optical filters. The one or more add-drop modules are configured to selectively drop a fixed band of wavelength channels from an access subnetwork, via a passive directional coupler, to each of multiple client nodes that actively select to receive client-specific channels within the fixed band. The one or more add-drop modules are also configured to selectively add the fixed band of wavelength channels to the access subnetwork, as received via a passive directional coupler from the multiple client nodes that actively select to transmit client-specific channels within the fixed band. With an access subnetwork node and a client node configured in this way, embodiments herein reduce the complexity and accompanying cost of nodes in an optical network, while also maintaining flexibility for assigning wavelength channels in the network.
Description
technical field [0001] The present invention generally relates to methods and devices associated with access subnetworks, and in particular to access subnetwork nodes, client nodes connected to the access subnetwork nodes, wavelength assigning nodes, and method. Background technique [0002] Increasing the flexibility with which an optical transport network can assign and route wavelength channels has traditionally increased the efficiency of the network. Reconfigurable optical add-drop multiplexers (ROADMs) have greatly facilitated this increased flexibility by allowing wavelength channels to be selectively added or dropped at any node in the network. However, ROADMs provide this flexible capability using rather complex and expensive components. Additionally, many of these components are active, which means ROADMs require power infrastructure and interfaces to manage failures and upgrades. ROADM thus proves prohibitive in some contexts. [0003] One such context concern...
Claims
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IPC IPC(8): H04J14/02
CPCH04J14/021H04J14/0213
Inventor P.厄伦
Owner TELEFON AB LM ERICSSON (PUBL)