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Method and apparatus for dynamic wavelength allocation in Wavelength switched optical networks

An optical network and wavelength technology, applied in the field of optical telecommunications and data networks, which can solve problems such as inefficient resource utilization

Inactive Publication Date: 2013-04-17
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a lightpath request occurs, the Path Computation Element (PCE) that calculates the path to provide the lightpath has to exclude some actually acceptable paths, resulting in inefficient resource utilization

Method used

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  • Method and apparatus for dynamic wavelength allocation in Wavelength switched optical networks
  • Method and apparatus for dynamic wavelength allocation in Wavelength switched optical networks
  • Method and apparatus for dynamic wavelength allocation in Wavelength switched optical networks

Examples

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Embodiment Construction

[0021] To illustrate an embodiment of the invention, consider a transparent optical network with N nodes and L bidirectional links. It is also assumed that the network is a Dense Wavelength Division Multiplexing (DWDM) network. However, the invention is equally applicable to WDM (Wavelength Division Multiplexing) networks. In such DWDM networks, adjacent wavelength channels are spectrally separated by a constant amount (eg, 100GHz). The wavelength carriers are sorted in ascending order. assuming w 0 is the lowest wavelength channel in the DWDM comb (or multiplex) (at wavelength λ 0 operation), w 1 (at wavelength λ 1 operation) is away from w 0 nearest channel. In general, in a DWDM multiplex, there are 40 wavelengths (channels), with indices from 0 to 39. Each node and link supports transmission and reception at 10Gbit / s and 40Gbit / s, and each link supports W wavelengths per direction (in this example, W=40). In alternative embodiments, there are 80 or even 160 channe...

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Abstract

A method of allocating a wavelength to a lightpath in a wavelength multiplex for use in an optical network comprising nodes connected by optical links, wherein the wavelength multiplex is adapted to support lightpaths of two different bitrates. The disclosed method allows for efficient allocation of wavelengths that prevents wasting bandwidth and mitigates detrimental effects of cross-phase modulation.

Description

technical field [0001] The present invention relates generally to optical telecommunications and data networks, and in particular to methods and apparatus for dynamic wavelength allocation in wavelength switched optical networks. Background technique [0002] Emerging solutions for wavelength-switched optical networks (WSON) will simultaneously allow mesh connectivity of multiple bit-rate channels over the same optical transport infrastructure. In this way, it will be possible to provide a flexible transmission platform for current and future bit rates. This means that providing 40 Gbit / s (or even at higher bit rates) optical signals in conjunction with existing 10 Gbit / s signals will be required when upgrading existing telecommunication and data networks to operate as WSONs. [0003] In the case of multi-bit rate WSON, cross-phase modulation (XPM) is particularly detrimental to phase-shift keying (xPSK) modulated signals when induced by on-off keying (OOK) modulated signal...

Claims

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Application Information

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IPC IPC(8): H04J14/02
CPCH04J14/0257H04J14/026H04J14/0267H04J14/0269
Inventor N.萨姆博F.库吉尼P.卡斯托尔迪G.博塔里P.伊奥瓦纳
Owner TELEFON AB LM ERICSSON (PUBL)
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