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Advanced dispersion map for DSF transmission system

A technology of dispersion-shifted optical fiber and dispersion-compensated optical fiber, which can be used in transmission systems, electromagnetic wave transmission systems, electrical components, etc., and can solve problems such as optical pulse broadening.

Inactive Publication Date: 2006-07-12
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, the accumulated dispersion itself causes the transmitted optical pulse to broaden since it implies different group velocities of the light pulses at different wavelengths

Method used

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  • Advanced dispersion map for DSF transmission system
  • Advanced dispersion map for DSF transmission system
  • Advanced dispersion map for DSF transmission system

Examples

Experimental program
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Embodiment Construction

[0014] An architecture known in the prior art is shown in Fig. 1a. A stage consisting of a single-mode fiber SMF and a dispersion compensating fiber DCF is placed between each fiber span consisting of a dispersion-shifted fiber DSF or a first-generation non-return-to-zero dispersion-shifted fiber NZ-DSF. Multiple triangles identify multiple amplifiers. The corresponding dispersion of the optical signal as a function of distance for two different wavelengths of this architecture, namely 1560 nm wavelength and 1530 nm wavelength, is shown in Fig. 1b. The dispersion map used is such that dispersion is almost fully compensated after each fiber span of the DSF. The SMF is added to make it possible to compensate the dispersion slope of the DSF with the DCF.

[0015] Figure 2a The architecture according to the invention is shown in . The architecture is based on the choice of not fully compensating the dispersion and possibly also the dispersion slope after each span of the DSF o...

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Abstract

It is proposed a method for processing optical signals to be transmitted through a succession of transmission lines spans made out of DSF and a system architecture allowing the implementation of such a method for compensating dispersion occurring at the transmission path without suffering too much from any cross-phase modulation. This is achieved by the use of a system architecture comprising a succession of transmission lines spans made out of dispersion shifted fibers DSF with in-between a stage made alternately by a single mode fiber SMF or a dispersion compensating fiber DCF. Both DSF and SMF have dispersion of same sign. In another embodiment of the system architecture, the used DSF and SMF have also both dispersion slope of same sign. In such a way, it is possible to limit the impact of the XPM by not compensating the dispersion and possibly the dispersion slope at each span.

Description

technical field [0001] The present invention relates to a method for processing an optical signal to be transmitted through a series of transmission line spans. Furthermore, the invention relates to an architecture for long-distance transmission of optical signals. The present invention is based on European priority application EP 05 290 012.3, the content of which is hereby incorporated by reference. Background technique [0002] Nonlinear optical effects such as four-wave mixing (FWM) and cross-phase modulation (XPM) have the potential to degrade optical signals transmitted over long-distance optical networks. Increasing the dispersion in the fiber reduces both FWM and XPM. In fact, the accumulated dispersion itself causes the transmitted optical pulses to broaden, since the accumulated dispersion implies different group velocities of the light pulses at different wavelengths. In fact, the relative group velocities of the pulses at different wavelengths will be higher, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/18H04B10/2525
CPCH04B10/25253
Inventor 加布里埃尔·沙莱让·克里斯托夫·安东纳
Owner ALCATEL LUCENT SAS