Wavelength selection

A wavelength and path technology, applied in the field of optical data transmission along the path in the optical network, can solve the problems of no end-to-end, obstruction, no consideration of connection attempts, etc., and achieve the effect of improving the success rate

Inactive Publication Date: 2007-07-11
BRITISH TELECOMM PLC
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  • Abstract
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Problems solved by technology

A disadvantage associated with these methods is that they do not take into account how the wavelength selection decision will affect future connection attempts along paths that have one or more links in common with the path for which the wavelength is being selected
As a result, future connection attempts may be hindered because there are no wavelengths available end-to-end along the entire path to be established

Method used

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Embodiment Construction

[0021] Figure 1 shows an all-optical network comprising six optical network nodes (A, B, C, D, E and F), more commonly referred to as optical cross-connect units or OXCs. A suitable OXC currently available is the Lambda NODE available from Lambda Optical Systems, Inc., Reston, Virginia, USA. Data is transmitted at specific wavelengths over the fiber optic links that interconnect the OXCs. Treat each direction of a fiber optic link as an independent, unidirectional link. On each OXC, data is received on the input port, switched in the optical domain and transmitted out on the associated output port without any optical-to-optical conversion. Using wavelength division multiplexing (WDM), several different wavelengths can be used simultaneously on each fiber link. The number of wavelengths each fiber link can support depends on the exact nature of the network being deployed and should be decided during the network design phase (eg, how much the deployer of the network wants to p...

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Abstract

A method of selecting a wavelength for use in transmitting optical data along a path in an optical network is disclosed. Previously known methods for selecting wavelengths do not consider how a wavelength selection decision will affect future connection attempts along paths that have one or more links in common with the path for which the wavelength is being selected. Consequently, a future connection attempt may be blocked because there are no wavelengths available end-to-end along the entire path that is to be set up. In the proposed method, the wavelengths that are available for use end-to-end along the path are found, the wavelengths that are available on each link attached to each node on the path are found and a wavelength that is available end-to-end and that is more available on the links attached to the nodes on the path than other wavelengths is selected.

Description

technical field [0001] The invention relates to a method of selecting wavelengths used in the transmission of optical data along paths in an optical network. Background technique [0002] In an optical network, data is transmitted over optical fibers that connect network nodes (often called routers or switches) to each other. As data traverses the network, it passes through one or more network nodes. At each network node, data is received on an input port, converted from optical to electrical, processed in the electrical domain, converted from electrical to optical and transmitted out on the associated output port. This conversion from an optical signal to an electrical signal and back again to an optical signal is called an electro-optical (OEO) conversion. [0003] There are two main consequences of doing OEO transformations on every node. First, OEO conversion reshapes, retimes and resends the optical signal at each node, which means that each link in the end-to-end pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02
CPCH04J14/0241H04J14/0284H04J14/0227
Inventor 本杰明·保罗·尼文·詹金斯约翰·罗伯特·金
Owner BRITISH TELECOMM PLC
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