EP1616398A2 - Optical pulse regeneration device, installation comprising one such device and use of same - Google Patents
Optical pulse regeneration device, installation comprising one such device and use of sameInfo
- Publication number
- EP1616398A2 EP1616398A2 EP04742548A EP04742548A EP1616398A2 EP 1616398 A2 EP1616398 A2 EP 1616398A2 EP 04742548 A EP04742548 A EP 04742548A EP 04742548 A EP04742548 A EP 04742548A EP 1616398 A2 EP1616398 A2 EP 1616398A2
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- Prior art keywords
- optical
- pulses
- propagation
- intensity
- regeneration
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- 230000003287 optical effect Effects 0.000 title claims abstract description 33
- 230000008929 regeneration Effects 0.000 title claims abstract description 25
- 238000011069 regeneration method Methods 0.000 title claims abstract description 25
- 238000009434 installation Methods 0.000 title claims description 12
- 230000001629 suppression Effects 0.000 claims abstract description 12
- 230000006641 stabilisation Effects 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 17
- 230000001360 synchronised effect Effects 0.000 claims description 15
- 230000002745 absorbent Effects 0.000 claims description 10
- 239000002250 absorbent Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 9
- 238000011105 stabilization Methods 0.000 claims description 9
- 230000002269 spontaneous effect Effects 0.000 claims description 7
- 230000001902 propagating effect Effects 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000003019 stabilising effect Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 230000002123 temporal effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/25077—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion using soliton propagation
Definitions
- Optical pulse regeneration device installation comprising such a device and use of this device
- the present invention relates to an optical pulse regeneration device.
- the invention also relates to an optical transmission installation comprising such a device and the use of this device for the regeneration of DM soliton pulses. More specifically, the invention relates to an optical pulse regeneration device of the type comprising time synchronization means and means for stabilizing the fluctuation of intensity of these pulses.
- Devices for optical pulse regeneration are known, which are effective in particular for regenerating pulses of the soliton type. These devices implement a 3R optical regeneration (for Re-amplification, Fitness, Resynchronization, from the English “Re-amplification, Re-shaping, Re-timing").
- Soliton type pulses have the property of propagating without deformation in a non-linear medium, since these particular pulses are solutions of the non-linear Schrodinger equation.
- the accumulation of amplified spontaneous emission noise disrupts the propagation of these pulses by generating intensity fluctuations and a temporal jitter (known as Gordon-Haus), hence the need to regenerate them optically.
- the pulses emitted must not be too close together, which imposes narrow temporal widths of the soliton pulses and therefore a broad spectrum.
- An interesting solution for this type of application is the use of pulses of the DM soliton type (from the English "Dispersion-Managed") which offer significant advantages compared to conventional soliton pulses for high capacity transmission systems. .
- soliton DM responds much less than the classic soliton to 3R regeneration.
- a known optical regeneration device is described, in particular in the document entitled "Stability of synchronous intensity modulation control of 40 Gbit / s dispersion-managed solition transmissions", by Erwan Pincemin, Olivier Audouin, Bruno Dany and Stefan Wabnitz, extract from the Journal of Lightwave Technology, volume 19, n ° 5, May 2001.
- the solution recommended in this document consists in using a synchronous intensity modulator, placed at a convenient place to the optical fiber for transmitting the DM soliton pulses. But to be effective, this device must also suppress noise, in particular the noise of amplified spontaneous emission.
- the synchronous intensity modulator must have a sufficient extinction rate, for example of 10 dB, which means that short DM solitons with a broad spectrum must be used.
- the synchronous intensity modulator must not have a negative impact on the temporal width of the soliton DM pulse.
- the invention aims to remedy the aforementioned drawbacks by providing an optical pulse regeneration device, in particular of DM soliton pulses, capable of optically regenerating such pulses, while allowing them to be used for very high speed transmissions of the type Ultra dense WDM.
- the subject of the invention is an optical pulse regeneration device, comprising time synchronization means and means for stabilizing fluctuations in intensity of these pulses, characterized in that it also comprises means noise suppression, distinct from synchronization means and stabilization means.
- a typical regeneration device may also include one or more of the following characteristics:
- the time synchronization means and the intensity fluctuation stabilization means comprise a synchronous intensity modulator
- the noise suppression means comprise a saturable absorbent (16), for the suppression of amplified spontaneous emission noise.
- the invention also relates to an installation for optical transmission of pulses comprising means for propagating optical signals, characterized in that it comprises an optical regeneration device, inserted in the propagation means.
- An optical transmission installation according to the invention can also include one or more of the following characteristics: the propagation means comprise first propagation means with abnormal dispersion and second propagation means with normal dispersion, the time synchronization means and the intensity fluctuation stabilization means being inserted in the vicinity of the junction between the first and second means of propagation,
- the noise suppression means are located upstream of the synchronization means and stabilization means, in the direction of propagation of the pulses.
- the invention also relates to the use of a device as described above, for the regeneration of DM soliton pulses.
- FIG. 1 schematically shows the general structure of an optical pulse transmission installation comprising a device according to the invention.
- FIG. 1 The installation of optical transmission represented in FIG. 1 comprises a line fiber 10 for the optical transmission of pulses of the DM soliton type. These pulses are used for very high speed optical transmission applications, for example transmissions at 40 Gbit / s or higher.
- Line fiber 10 comprises a first portion of fiber 10a with abnormal dispersion, the dispersion coefficient D + of which is for example equal to 2 ps / nm / km.
- This first portion of fiber with abnormal dispersion 10a is extended by a second portion of fiber 10b with normal dispersion, whose dispersion coefficient D. is equal to -2 ps / nm / km.
- the diagram in FIG. 1 can be reproduced periodically, in order to provide a line fiber of significantly greater length, in particular for obtaining line fibers allowing transoceanic transmissions.
- a synchronous intensity modulator 14 of conventional type has been installed, having the effect of a temporal synchronization of the pulses passing through it and a stabilization of the intensity fluctuations of these pulses. More specifically, the effect of this modulator intensity synchronous 14 on the pulses propagating in the line fiber 10 will be described with reference to FIG. 2.
- the optical regeneration device 12 also comprises noise suppression means 16, distinct from the synchronous intensity modulator 14, for the suppression of amplified spontaneous emission noise.
- noise suppression means are materialized by a saturable absorbent 16. More precisely, the effect of this saturable absorbent 16 will be described with reference to FIG. 3.
- this saturable absorbent 16 is disposed upstream of the synchronous intensity modulator 14, in the line fiber 10, relative to the direction of propagation of the soliton pulses DM.
- the saturable absorbent 16 can be arranged indifferently before or after the synchronous intensity modulator 14, in reality, when the absorbent does not have a perfect response, it is more advantageous to have this saturable absorbent upstream of the synchronous intensity modulator, so that the latter can correct the imperfections of the response of the saturable absorbent.
- the synchronous intensity modulator 14 performs a slight modulation of pulses h, l 2 and l 3 by synchronized modulating signals, making it possible to correct respective synchronization deviations Ei, E and E 3 of these pulses, without trying to eliminate the noise.
- the saturable absorbent suppresses signals, such as a signal S ⁇ whose maximum intensity is less than a threshold intensity l s and lets through signals S 2 and S 3 , whose l maximum intensity exceeds threshold intensity l s . It also readjusts these signals S 2 and S 3 .
- the threshold intensity l s is chosen, so that the eliminated signals, such as the signal S ⁇ are signals originating from amplified spontaneous emission noise.
- a typical regeneration device allows the correct regeneration of DM soliton pulses in very high speed optical transmission installations, in particular of the ultra dense WDM type.
Abstract
The invention relates to an optical pulse regeneration device comprising time synchronisation means (14) and means (14) for stabilising intensity fluctuations in said pulses. The inventive device also comprises noise suppression means (16) which are different from the aforementioned synchronisation means (14) and stabilisation means (14).
Description
Dispositif de régénération optique d'impulsions, installation comprenant un tel dispositif et utilisation de ce dispositifOptical pulse regeneration device, installation comprising such a device and use of this device
La présente invention concerne un dispositif de régénération optique d'impulsions. L'invention concerne également une installation de transmission optique comprenant un tel dispositif et l'utilisation de ce dispositif pour la régénération d'impulsions solitons DM. Plus précisément, l'invention concerne un dispositif de régénération optique d'impulsions du type comportant des moyens de synchronisation temporelle et des moyens de stabilisation de fluctuation d'intensité de ces impulsions.The present invention relates to an optical pulse regeneration device. The invention also relates to an optical transmission installation comprising such a device and the use of this device for the regeneration of DM soliton pulses. More specifically, the invention relates to an optical pulse regeneration device of the type comprising time synchronization means and means for stabilizing the fluctuation of intensity of these pulses.
On connaît des dispositifs de régénération optique d'impulsions, efficaces notamment pour régénérer des impulsions de type solitons. Ces dispositifs mettent en oeuvre une régénération optique 3R (pour Re-amplification, Remise en forme, Resynchronisation, de l'anglais "Re-amplification, Re-shaping, Re-timing").Devices for optical pulse regeneration are known, which are effective in particular for regenerating pulses of the soliton type. These devices implement a 3R optical regeneration (for Re-amplification, Fitness, Resynchronization, from the English "Re-amplification, Re-shaping, Re-timing").
Les impulsions de type solitons ont la propriété de se propager sans déformation en milieu non linéaire, puisque ces impulsions particulières sont solution de l'équation de Schrôdinger non linéaire. L'accumulation du bruit d'émission spontanée amplifiée vient cependant perturber la propagation de ces impulsions en générant des fluctuations d'intensité et une gigue temporelle (dite de Gordon-Haus), d'où la nécessité de les régénérer optiquement.Soliton type pulses have the property of propagating without deformation in a non-linear medium, since these particular pulses are solutions of the non-linear Schrodinger equation. The accumulation of amplified spontaneous emission noise, however, disrupts the propagation of these pulses by generating intensity fluctuations and a temporal jitter (known as Gordon-Haus), hence the need to regenerate them optically.
De plus, pour que l'impulsion soliton se propage sans déformation et bénéficie d'une régénération optique idéale, les impulsions émises ne doivent pas être trop rapprochées, ce qui impose des largeurs temporelles étroites des impulsions solitons et donc un spectre large. Ceci pose problème lorsque l'on s'intéresse à des applications de transmission optique de type WDM ultra dense (pour Multiplexage par division de longueur d'onde, de l'anglais "Wavelength Division Multiplexing"), notamment à des débits dépassants 40 Gbit/s et sur de longues distances de type transocéaniques. Une solution intéressante pour ce type d'application est l'utilisation d'impulsions de type solitons DM (de l'anglais "Dispersion-Managed") qui offrent des avantages significatifs par rapport aux impulsions solitons classiques pour des systèmes de transmission à haute capacité. Par contre, le soliton DM répond beaucoup moins bien que le soliton classique à la régénération 3R. Pour une impulsion de type soliton DM, un dispositif de régénération optique connu est décrit, notamment dans le document intitulé "Stability of synchronous intensity modulation control of 40 Gbit/s dispersion-managed solition transmissions", de Erwan
Pincemin, Olivier Audouin, Bruno Dany et Stefan Wabnitz, extrait du Journal of Lightwave Technology, volume 19, n°5, Mai 2001. La solution préconisée dans ce document consiste à utiliser un modulateur synchrone d'intensité, disposé à un endroit judicieux de la fibre optique de transmission des impulsions solitons DM. Mais pour être efficace, ce dispositif doit également supprimer le bruit, notamment le bruit d'émission spontanée amplifiée. Pour cela le modulateur synchrone d'intensité doit avoir un taux d'extinction suffisant, par exemple de 10 dB, ce qui contraint à utiliser des solitons DM courts et présentant un spectre large. En effet, le modulateur synchrone d'intensité ne doit pas avoir d'impact négatif sur la largeur temporelle de l'impulsion soliton DM. L'invention vise à remédier aux inconvénients précités en fournissant un dispositif de régénération optique d'impulsions, notamment d'impulsions solitons DM, capable de régénérer optiquement de telles impulsions, tout en permettant de les utiliser pour des transmissions à très haut débit de type WDM ultra dense.In addition, for the soliton pulse to propagate without deformation and benefit from an ideal optical regeneration, the pulses emitted must not be too close together, which imposes narrow temporal widths of the soliton pulses and therefore a broad spectrum. This poses a problem when one is interested in ultra-dense WDM type optical transmission applications (for Wavelength Division Multiplexing), in particular at bit rates exceeding 40 Gbit / s and over long distances of the transoceanic type. An interesting solution for this type of application is the use of pulses of the DM soliton type (from the English "Dispersion-Managed") which offer significant advantages compared to conventional soliton pulses for high capacity transmission systems. . On the other hand, the soliton DM responds much less than the classic soliton to 3R regeneration. For a pulse of soliton DM type, a known optical regeneration device is described, in particular in the document entitled "Stability of synchronous intensity modulation control of 40 Gbit / s dispersion-managed solition transmissions", by Erwan Pincemin, Olivier Audouin, Bruno Dany and Stefan Wabnitz, extract from the Journal of Lightwave Technology, volume 19, n ° 5, May 2001. The solution recommended in this document consists in using a synchronous intensity modulator, placed at a convenient place to the optical fiber for transmitting the DM soliton pulses. But to be effective, this device must also suppress noise, in particular the noise of amplified spontaneous emission. For this, the synchronous intensity modulator must have a sufficient extinction rate, for example of 10 dB, which means that short DM solitons with a broad spectrum must be used. In fact, the synchronous intensity modulator must not have a negative impact on the temporal width of the soliton DM pulse. The invention aims to remedy the aforementioned drawbacks by providing an optical pulse regeneration device, in particular of DM soliton pulses, capable of optically regenerating such pulses, while allowing them to be used for very high speed transmissions of the type Ultra dense WDM.
A cet effet, l'invention a pour objet un dispositif de régénération optique d'impulsions, comportant des moyens de synchronisation temporelle et des moyens de stabilisation de fluctuations d'intensité de ces impulsions, caractérisé en ce qu'il comporte en outre des moyens de suppression de bruit, distincts des moyens de synchronisation et des moyens de stabilisation.To this end, the subject of the invention is an optical pulse regeneration device, comprising time synchronization means and means for stabilizing fluctuations in intensity of these pulses, characterized in that it also comprises means noise suppression, distinct from synchronization means and stabilization means.
Ainsi, les moyens de suppression de bruit étant distincts des moyens de synchronisation et des moyens de stabilisation, il n'est pas nécessaire d'utiliser ces derniers pour éliminer des bruits tels que le bruit d'émission spontanée amplifiée. Notamment, dans ce cas, une modulation synchrone d'intensité légère suffit pour synchroniser le signal et stabiliser les fluctuations d'intensité, le bruit étant éliminé séparément. Un dispositif de régénération type selon l'invention peut en outre comporter l'une ou plusieurs des caractéristiques suivantes :Thus, the noise suppression means being distinct from the synchronization means and the stabilization means, it is not necessary to use the latter to eliminate noise such as the amplified spontaneous emission noise. In particular, in this case, a light intensity synchronous modulation is sufficient to synchronize the signal and stabilize the intensity fluctuations, the noise being eliminated separately. A typical regeneration device according to the invention may also include one or more of the following characteristics:
- les moyens de synchronisation temporelle et les moyens de stabilisation de fluctuations d'intensité comportent un modulateur synchrone d'intensité,the time synchronization means and the intensity fluctuation stabilization means comprise a synchronous intensity modulator,
- les moyens de suppression de bruit comportent un absorbant saturable (16), pour la suppression de bruit d'émission spontanée amplifiée.- The noise suppression means comprise a saturable absorbent (16), for the suppression of amplified spontaneous emission noise.
L'invention a également pour objet une installation de transmission optique d'impulsions comportant des moyens de propagation de signaux optiques, caractérisée en ce qu'elle comporte un dispositif de régénération optique, inséré dans les moyens de propagation. Une installation de transmission optique selon l'invention peut en outre comporter l'une ou plusieurs des caractéristiques suivantes :
- les moyens de propagation comportent des premiers moyens de propagation à dispersion anormale et des seconds moyens de propagation à dispersion normale, les moyens de synchronisation temporelle et les moyens de stabilisation de fluctuation d'intensité étant insérés au voisinage de la jonction entre les premiers et seconds moyens de propagation,The invention also relates to an installation for optical transmission of pulses comprising means for propagating optical signals, characterized in that it comprises an optical regeneration device, inserted in the propagation means. An optical transmission installation according to the invention can also include one or more of the following characteristics: the propagation means comprise first propagation means with abnormal dispersion and second propagation means with normal dispersion, the time synchronization means and the intensity fluctuation stabilization means being inserted in the vicinity of the junction between the first and second means of propagation,
- les moyens de suppression de bruit sont situés en amont des moyens de synchronisation et des moyens de stabilisation, dans le sens de propagation des impulsions.- the noise suppression means are located upstream of the synchronization means and stabilization means, in the direction of propagation of the pulses.
Enfin, l'invention concerne également une utilisation d'un dispositif tel que décrit précédemment, pour la régénération d'impulsions solitons DM.Finally, the invention also relates to the use of a device as described above, for the regeneration of DM soliton pulses.
L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés dans lesquels :The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings in which:
- la figure 1 représente schématiquement la structure générale d'une installation de transmission optique d'impulsions comportant un dispositif selon l'invention ; et- Figure 1 schematically shows the general structure of an optical pulse transmission installation comprising a device according to the invention; and
- les figures 2 et 3 illustrent, à l'aide de diagrammes, l'effet d'un dispositif de régénération optique selon l'invention sur des impulsions optiques se propageant dans l'installation de la figure 1. L'installation de transmission optique représentée sur la figure 1 comporte une fibre de ligne 10 pour la transmission optique d'impulsions de type solitons DM. Ces impulsions sont utilisées pour des applications de transmission optique à très haut débit, par exemple des transmissions à 40 Gbit/s ou davantage.- Figures 2 and 3 illustrate, using diagrams, the effect of an optical regeneration device according to the invention on optical pulses propagating in the installation of Figure 1. The installation of optical transmission represented in FIG. 1 comprises a line fiber 10 for the optical transmission of pulses of the DM soliton type. These pulses are used for very high speed optical transmission applications, for example transmissions at 40 Gbit / s or higher.
La fibre de ligne 10 comporte une première portion de fibre 10a à dispersion anormale, dont le coefficient de dispersion D+ est par exemple égal à 2 ps/nm/km. Cette première portion de fibre à dispersion anormale 10a est prolongée par une seconde portion de fibre 10b à dispersion normale, dont le coefficient de dispersion D. est égal à -2ps/nm/km. La première portion de fibre 10a a par exemple une longueur = 20,5 km, pour une longueur totale de fibre de ligne 10 égale à L2 = 40 km. Le schéma de la figure 1 peut être reproduit périodiquement, pour fournir une fibre de ligne de longueur nettement supérieure, notamment pour obtenir des fibres de ligne permettant des transmissions transocéaniques.Line fiber 10 comprises a first portion of fiber 10a with abnormal dispersion, the dispersion coefficient D + of which is for example equal to 2 ps / nm / km. This first portion of fiber with abnormal dispersion 10a is extended by a second portion of fiber 10b with normal dispersion, whose dispersion coefficient D. is equal to -2 ps / nm / km. The first portion of fiber 10a has for example a length = 20.5 km, for a total length of line fiber 10 equal to L 2 = 40 km. The diagram in FIG. 1 can be reproduced periodically, in order to provide a line fiber of significantly greater length, in particular for obtaining line fibers allowing transoceanic transmissions.
A la jonction entre la première et la deuxième portions de fibres 10a et 10b, on a installé un modulateur synchrone d'intensité 14 de type classique, ayant pour effet une synchronisation temporelle des impulsions le traversant et une stabilisation des fluctuations d'intensité de ces impulsions. Plus précisément, l'effet de ce modulateur
synchrone d'intensité 14 sur les impulsions se propageant dans la fibre de ligne 10 sera décrit en référence à la figure 2.At the junction between the first and second portions of fibers 10a and 10b, a synchronous intensity modulator 14 of conventional type has been installed, having the effect of a temporal synchronization of the pulses passing through it and a stabilization of the intensity fluctuations of these pulses. More specifically, the effect of this modulator intensity synchronous 14 on the pulses propagating in the line fiber 10 will be described with reference to FIG. 2.
Le dispositif 12 de régénération optique comporte en outre des moyens de suppression de bruit 16, distincts du modulateur synchrone d'intensité 14, pour la suppression de bruit d'émission spontanée amplifiée. Ces moyens de suppression de bruit sont matérialisés par un absorbant saturable 16. De façon plus précise, l'effet de cet absorbant saturable 16 sera décrit en référence à la figure 3.The optical regeneration device 12 also comprises noise suppression means 16, distinct from the synchronous intensity modulator 14, for the suppression of amplified spontaneous emission noise. These noise suppression means are materialized by a saturable absorbent 16. More precisely, the effect of this saturable absorbent 16 will be described with reference to FIG. 3.
Dans un mode de réalisation préféré, cet absorbant saturable 16 est disposé en amont du modulateur synchrone d'intensité 14, dans la fibre de ligne 10, par rapport au sens de propagation des impulsions solitons DM. En effet, si dans le cas idéal l'absorbant saturable 16 peut être disposé indifféremment avant ou après le modulateur synchrone d'intensité 14, en réalité, lorsque l'absorbant n'a pas une réponse parfaite, il est plus avantageux de disposer cet absorbant saturable en amont du modulateur synchrone d'intensité, pour que ce dernier puisse corriger les imperfections de la réponse de l'absorbant saturable.In a preferred embodiment, this saturable absorbent 16 is disposed upstream of the synchronous intensity modulator 14, in the line fiber 10, relative to the direction of propagation of the soliton pulses DM. Indeed, if in the ideal case the saturable absorbent 16 can be arranged indifferently before or after the synchronous intensity modulator 14, in reality, when the absorbent does not have a perfect response, it is more advantageous to have this saturable absorbent upstream of the synchronous intensity modulator, so that the latter can correct the imperfections of the response of the saturable absorbent.
Comme cela est représenté sur la figure 2, le modulateur synchrone d'intensité 14 réalise une légère modulation d'impulsions h, l2 et l3 par des signaux modulant synchronisés, permettant de corriger des écarts de synchronisation respectifs Ei, E et E3 de ces impulsions, sans tenter d'éliminer le bruit. Enfin, comme représenté sur la figure 3, l'absorbant saturable supprime des signaux, tels qu'un signal S^ dont l'intensité maximale est inférieure à une intensité seuil ls et laisse passer des signaux S2 et S3, dont l'intensité maximale dépasse l'intensité seuil ls. Il réajuste aussi ces signaux S2 et S3. L'intensité seuil ls est choisie, de telle sorte que les signaux éliminés, tels que le signal S^ soient des signaux provenant de bruit d'émission spontanée amplifiée.As shown in FIG. 2, the synchronous intensity modulator 14 performs a slight modulation of pulses h, l 2 and l 3 by synchronized modulating signals, making it possible to correct respective synchronization deviations Ei, E and E 3 of these pulses, without trying to eliminate the noise. Finally, as shown in FIG. 3, the saturable absorbent suppresses signals, such as a signal S ^ whose maximum intensity is less than a threshold intensity l s and lets through signals S 2 and S 3 , whose l maximum intensity exceeds threshold intensity l s . It also readjusts these signals S 2 and S 3 . The threshold intensity l s is chosen, so that the eliminated signals, such as the signal S ^ are signals originating from amplified spontaneous emission noise.
Il apparaît clairement qu'un dispositif de régénération type selon l'invention, permet la régénération correcte d'impulsions solitons DM, dans des installations de transmission optique à très haut débit, notamment du type WDM ultra dense.
It clearly appears that a typical regeneration device according to the invention allows the correct regeneration of DM soliton pulses in very high speed optical transmission installations, in particular of the ultra dense WDM type.
Claims
1. Dispositif (12) de régénération optique d'impulsions, comportant des moyens (14) de synchronisation temporelle et des moyens (14) de stabilisation de fluctuations d'intensité de ces impulsions, caractérisé en ce qu'il comporte en outre des moyens (16) de suppression de bruit, distincts des moyens de synchronisation (14) et des moyens de stabilisation (14).1. Device (12) for optical pulse regeneration, comprising means (14) for time synchronization and means (14) for stabilizing fluctuations in intensity of these pulses, characterized in that it also comprises means (16) for suppressing noise, distinct from the synchronization means (14) and the stabilization means (14).
2. Dispositif de régénération optique (12) selon la revendication 1 , caractérisé en ce que les moyens de synchronisation temporelle et les moyens de stabilisation de fluctuations d'intensité comportent un modulateur synchrone d'intensité (14).2. Optical regeneration device (12) according to claim 1, characterized in that the time synchronization means and the means for stabilizing intensity fluctuations comprise a synchronous intensity modulator (14).
3. Dispositif de régénération optique (12) selon la revendication 1 ou 2, caractérisé en ce que les moyens de suppression de bruit comportent un absorbant saturable (16), pour la suppression de bruit d'émission spontanée amplifiée.3. Optical regeneration device (12) according to claim 1 or 2, characterized in that the noise suppression means comprise a saturable absorbent (16), for the suppression of amplified spontaneous emission noise.
4. Installation de transmission optique d'impulsions comportant des moyens (10) de propagation de signaux optiques, caractérisée en ce qu'elle comporte un dispositif de régénération optique (12) selon l'une quelconque des revendications 1 à 3, inséré dans les moyens de propagation.4. Installation of optical pulse transmission comprising means (10) for propagating optical signals, characterized in that it comprises an optical regeneration device (12) according to any one of claims 1 to 3, inserted in the means of propagation.
5. Installation de transmission optique selon la revendication 4, caractérisée en ce que les moyens de propagation (10) comportent des premiers moyens de propagation (10a) à dispersion anormale et des seconds moyens de propagation (10b) à dispersion normale, les moyens de synchronisation temporelle (14) et les moyens de stabilisation de fluctuation d'intensité (14) étant insérés au voisinage de la jonction entre les premiers et seconds moyens de propagation.5. Optical transmission installation according to claim 4, characterized in that the propagation means (10) comprise first propagation means (10a) with abnormal dispersion and second propagation means (10b) with normal dispersion, the means of time synchronization (14) and the intensity fluctuation stabilization means (14) being inserted in the vicinity of the junction between the first and second propagation means.
6. Installation de transmission optique selon la revendication 4 ou 5, caractérisée en ce que les moyens de suppression de bruit (16) sont situés en amont des moyens de synchronisation et des moyens de stabilisation, dans le sens de propagation des impulsions.6. Optical transmission installation according to claim 4 or 5, characterized in that the noise suppression means (16) are located upstream of the synchronization means and stabilization means, in the direction of propagation of the pulses.
7. Utilisation d'un dispositif selon l'une quelconque des revendications 1 à 3, pour la régénération d'impulsions solitons DM. 7. Use of a device according to any one of claims 1 to 3, for the regeneration of DM soliton pulses.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0304928A FR2854289A1 (en) | 2003-04-22 | 2003-04-22 | Optical pulse regeneration device for optical pulse transmission installation, has saturable absorbent arranged upstream of intensity synchronous modulator, where absorbent suppresses amplified spontaneous emission noise |
| PCT/FR2004/000970 WO2004095735A2 (en) | 2003-04-22 | 2004-04-20 | Optical pulse regeneration device, installation comprising one such device and use of same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1616398A2 true EP1616398A2 (en) | 2006-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04742548A Withdrawn EP1616398A2 (en) | 2003-04-22 | 2004-04-20 | Optical pulse regeneration device, installation comprising one such device and use of same |
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| Country | Link |
|---|---|
| US (1) | US7577365B2 (en) |
| EP (1) | EP1616398A2 (en) |
| FR (1) | FR2854289A1 (en) |
| WO (1) | WO2004095735A2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2764451B1 (en) * | 1997-06-05 | 1999-07-30 | Alsthom Cge Alcatel | FIBER OPTICAL TRANSMISSION SYSTEM WITH SOLITON SIGNALS, WAVELENGTH MULTIPLEXING AND SATURABLE ABSORBENTS |
| FR2882877A1 (en) * | 2005-03-02 | 2006-09-08 | France Telecom | OPTICAL PULSE REGENERATION DEVICE, INSTALLATION COMPRISING SUCH DEVICE AND USE THEREOF |
-
2003
- 2003-04-22 FR FR0304928A patent/FR2854289A1/en active Pending
-
2004
- 2004-04-20 WO PCT/FR2004/000970 patent/WO2004095735A2/en active Application Filing
- 2004-04-20 EP EP04742548A patent/EP1616398A2/en not_active Withdrawn
- 2004-04-20 US US10/553,879 patent/US7577365B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| ERWAN PINCEMIN ET AL: "Stability of Synchronous Intensity Modulation Control of 40-Gb/s Dispersion-Managed Soliton Transmissions", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE SERVICE CENTER, NEW YORK, NY, US, vol. 19, no. 5, 1 May 2001 (2001-05-01), XP011029950, ISSN: 0733-8724 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US7577365B2 (en) | 2009-08-18 |
| US20060221425A1 (en) | 2006-10-05 |
| WO2004095735A2 (en) | 2004-11-04 |
| FR2854289A1 (en) | 2004-10-29 |
| WO2004095735A8 (en) | 2005-03-10 |
| WO2004095735A3 (en) | 2004-12-16 |
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