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Transmission and routing of optical signals

An optical signal and routing technology used in the field of optical communication networks

Inactive Publication Date: 2012-01-18
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Transmission and routing of optical signals
  • Transmission and routing of optical signals
  • Transmission and routing of optical signals

Examples

Experimental program
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Effect test

example 1

[0091] Example 1: Single bottleneck

[0092] in Figure 4 In, suppose that the link capacity between S and 4 is insufficient. The mark BN around the link between nodes S and 4 indicates a bottleneck. Node S is before the bottleneck, starting from node S, there are two different splitting possibilities, and the waiting time is 105 and 115 respectively. Two shortest paths have been selected, and the links forming each path are shown by reference numerals P11 and P12, respectively.

example 2

[0093] Example 2: Double bottleneck

[0094] Figure 5 Based on the previous example, but there is another bottleneck BN in the link between nodes 5-8 that require full capacity. Therefore, neither of the two paths required to transmit the inversely multiplexed signal can be routed through this link. Starting from S, another segmentation possibility (waiting time 115) provides a solution. The links of the two paths are shown by P21 and P22. Note that in this case, full path diversity has been obtained.

example 3

[0095] Example 3: Nested segmentation

[0096] Image 6 Based on the previous example, but there is another bottleneck BN in the link between nodes 3-6. The channel passing through path P21 is not affected. However, there is not enough capacity for all channels of the previous path P22 to pass through the link between nodes 3-6. This method finds two sub-paths (P22A and P22B) with the same waiting time from node 3 to destination node D. The solution is that a certain subset of the channel is routed from node 3 through nodes 6 and 9 along sub-path P22B (the waiting time is 25+30+10=65), and another subset is routed through nodes 4 and 7 along sub-path P22A (The waiting time is 15+30+20=65).

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Abstract

Methods and apparatus for routing and transmission of inverse multiplexed signals over optical communications networks are described. A method for routing includes determining a plurality of paths for transmission of a plurality of inverse-multiplexed optical signals from a source node to a destination node of an optical network. Each path is for transmission of at least one of the inverse-multiplexed optical signals. A latency difference between a fastest one of said paths and a slowest one of said paths is less than a predetermined time period.

Description

Technical field [0001] The present invention generally relates to optical communication networks, and in particular, to a method and device for routing and / or transmission of inversely multiplexed signals through an optical communication network. The embodiments of the present invention are particularly suitable for routing and transmission of such signals through an optical mesh network. Background technique [0002] Wavelength division multiplexing refers to the transmission of several different signals via a single optical transmission medium (for example, optical fiber) by sending each signal ("channel") at different optical frequencies or wavelengths. The multiplexer is used to combine different channels for transmission, and the demultiplexer is used to separate the transmitted channels. The WDM optical transmission system generally consists of multiple optical fiber spans that link network nodes together. [0003] Early WDM networks used simple, fixed optical fibers to rou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04J3/16
CPCH04J14/0267H04Q2011/0084H04J14/0257H04Q2011/0073H04Q11/0062H04Q2011/0086
Inventor G·布鲁诺
Owner TELEFON AB LM ERICSSON (PUBL)