FR2837290A1 - Ultra-compact optical amplifier used in telecommunications comprises housing containing an optical pump, a light amplification and guiding unit, passive optical coupling elements, and light guides - Google Patents

Ultra-compact optical amplifier used in telecommunications comprises housing containing an optical pump, a light amplification and guiding unit, passive optical coupling elements, and light guides Download PDF

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Publication number
FR2837290A1
FR2837290A1 FR0203231A FR0203231A FR2837290A1 FR 2837290 A1 FR2837290 A1 FR 2837290A1 FR 0203231 A FR0203231 A FR 0203231A FR 0203231 A FR0203231 A FR 0203231A FR 2837290 A1 FR2837290 A1 FR 2837290A1
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Prior art keywords
elements
light
amplification
optical
passive
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FR0203231A
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French (fr)
Inventor
Dominique Hamoir
Jacques Auge
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3SP Technologies SAS
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Alcatel Optronics France SA
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Priority to FR0203231A priority Critical patent/FR2837290A1/en
Publication of FR2837290A1 publication Critical patent/FR2837290A1/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06704Housings; Packages
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06754Fibre amplifiers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

The ultra-compact optical amplifier comprises a housing (15) containing an optical pump (3), a light amplification and guiding unit (4), first passive optical coupling elements (6, 7, 9, 10), a first guide for light to be amplified (8), second passive optical coupling elements (12-14), and a second light guide (11) for amplified light. The light amplification and guiding unit (4) receives and guides the energy from the optical pump (3) and the light to be amplified. The first passive optical coupling elements (6, 7, 9, 10) receive the light to be amplified from a first light guide (8) and pass it on to the light amplifier (4). The second passive optical coupling elements (12-14) collect the amplified light and deliver it to a second light guide (11). At least one of the optical pump (3), the light amplification and guiding unit (4), the first passive optical coupling elements (6, 7, 9, 10) and the second passive optical coupling elements (12-14) are implanted on a substrate (2). The light amplification and guiding unit (4) comprises a material selected from glass and its derivatives, and polymers. The material is doped with a rare earth ion or complex, or is doped with a metallic ion, especially chromium, or comprises doped nanoparticles. The light amplification and guiding unit (4) comprises an optical fiber installed in a rectilinear or U-shaped form, or in the form of a multi-wound loop. The first and second passive optical coupling elements (6, 7, 9, 10, 12-14) are selected from a group comprising at least micro-mirrors, micro-lenses, isolators, pumping signal wavelength multiplexers, static or variable equalizing filters, static or variable attenuators, or rejection filters. The housing (15) also includes an auxiliary regulation and/or monitoring and/or control element selected from coupling and/or filtering and/or channel multiplexing and/or demultiplexing elements. A gain equalizing filter is produced on at least one surface of the first and second passive optical elements (6, 7, 9, 10, 12-14)) and the auxiliary elements, and on at least one of the inlet and outlet faces of the light amplification and guiding unit (4). The device can consists of several optical pumps (3), several light amplification and guiding units (4), several first (6, 7, 9, 10) and second (12-14) passive optical elements and/or several auxiliary elements accommodated in the housing (15). An Independent claim is given for utilization of the device in telecommunications.

Description

connecteur optique inclut un connecteur SC, LC ou MU.Optical connector includes an SC, LC or MU connector.

DISPOSITIF D'AMPLIFICATION OPTIQUE ULTRA-COMPACT  ULTRA-COMPACT OPTICAL AMPLIFICATION DEVICE

L'invention concerne le domaine des dispositifs optiques, et plus particulierement celui des dispositifs d'amplification optique comportant un milieu d'amplification assurant egalement le guidage du signal optique a  The invention concerns the field of optical devices, and more particularly that of optical amplification devices comprising an amplification medium also ensuring the guidance of the optical signal.

amplifier et de l'energie de pompage.  amplify and pump energy.

La plupart des dispositifs d'amplification optique, du type precise, vent constitues d'un assemblage d'elements de pompage optique et d'elements optiques passifs, realisant un couplage optique soit entre des moyens de guidage de lumiere, tels que des fibres optiques d'alimentation et de collection, et des moyens d'amplification et de guidage de lumiere, tels que des fibres optiques dopees ou des guides d'onde, soit entre les elements de pompage et  Most optical amplification devices, of the precise type, consist of an assembly of optical pumping elements and passive optical elements, performing an optical coupling between light guiding means, such as optical fibers. power supply and collection, and light amplification and guiding means, such as doped optical fibers or waveguides, or between the pumping elements and

les moyens d'amplification et de guidage.  the amplification and guidance means.

Chacun de ces elements possedant son propre conditionnement (ou a package >>) ou, dans le cas des fibres optiques, une amorce (ou << pigtail >>),  Each of these elements having its own packaging (or a package >>) or, in the case of optical fibers, a primer (or "pigtail"),

I'encombrement final du dispositif est done important et son cout eleve.  The final encumbrance of the device is therefore important and its high cost.

Plusieurs solutions ont ete recemment proposees pour tenter d'ameliorer la situation. Ainsi, il a ete propose de reduire les dimensions des differents elements, ou de reduire leur nombre, ou encore de renforcer l'ajustement des packages (en particulier en reduisant les rayons de courbure des fibres), ou encore de combiner plusieurs elements optiques passifs dans le meme package. Mais ces solutions vent limitees pour des raisons theoriques. II a egalement ete propose de faire appel a d'autres technologies, telles que les 2 5 fibres a double revetement et a pompage multimode ou les milieux d'amplification massifs a pompage lateral et multimode. Mais ces solutions  Several solutions have been recently proposed to try to improve the situation. Thus, it has been proposed to reduce the dimensions of the different elements, or to reduce their number, or to reinforce the adjustment of the packages (in particular by reducing the radii of curvature of the fibers), or to combine several passive optical elements. in the same package. But these solutions are limited for theoretical reasons. It has also been proposed to use other technologies, such as multi-mode, double-pumping and multi-mode pumping fibers, or side and multi-mode bulk pumping amplifiers. But these solutions

presentent des limitations similaires aux precedentes.  have similar limitations to the previous ones.

Par consequent, aucun dispositif n'apporte une entiere satisfaction en  Consequently, no device provides complete satisfaction in

matiere de compacite eVou de cout de fabrication.  compacite eVou matter of manufacturing cost.

3 0 L'invention a done pour but de remedier a tout ou partie des  The object of the invention is therefore to remedy all or part of the

inconvenients precites.aforementioned drawbacks.

Wile propose a cet effet un dispositif d'amplification optique dans lequel les elements optiques passHs et les moyens de pompage optique ne presentent ni package ni amorce. Plus precisement, le dispositif selon ['invention comporte un bo^'tier dans lequel vent logbs i) des moyens de pompage optique delivrant l'energie de pompage indispensable a I'amplification ii) des moyens d'amplification et de guidage de lumiere pouvant recevoir et guider l'energie de pompage et la lumiere a amplifier et delivrer la lumiere amplifiee, iii) des premiers elements optiques passifs de couplage (par  For this purpose, Wile proposes an optical amplification device in which the optical elements passHs and the optical pumping means do not present a package or a primer. More specifically, the device according to the invention comprises a box in which wind logbs i) optical pumping means delivering the pumping energy necessary for amplification ii) means for amplifying and guiding light that can receive and guide the pumping energy and the light to amplify and deliver the amplified light, iii) the first passive optical coupling elements (by

exemple des isolateurs eVou des multiplexeurs de longueur d'onde pompe-  example of eVou isolators wavelength multiplexors pump-

signal eVou des filtres egaliseurs statiques ou variables et/ou des attenuateurs statiques ou variables et/ou des filtres rejecteurs eVou des micro-lentilles) pour recevoir la lumiere a amplifier provenant de premiers moyens de guidage (par exemple une fibre optique d'entree) et alimenter les moyens d'amplHication et de guidage avec cette lumiere a amplifier, et iv) des seconds elements optiques passifs de couplage (par exemple des isolateurs eVou des multiplexeurs de longueur d'onde pompesignal eVou des filtres egaliseurs statiques ou variables et/ou des attenuateurs statiques ou variables et /ou des filtres rejecteurs eVou des micro-lentilles) pour collecter la lumiere amplifiee par les moyens d'amplification et de guidage, en presence de l'energie de pompage, pour la delivrer a des seconds moyens de guidage de lumiere (par  signal eVou static or variable equalizing filters and / or static or variable attenuators and / or rejector filters eVou microlenses) for receiving the light to be amplified from first guide means (for example an optical fiber input) and supplying the amplification and guidance means with this light to be amplified, and iv) second passive optical coupling elements (for example eVou insulators or wavelength signaling multiplexers eVou static or variable equalizing filters and / or static or variable attenuators and / or rejector filters eVou microlenses) for collecting the light amplified by the amplification and guidance means, in the presence of the pumping energy, to deliver it to second guide means light (by

2 0 exemple une fibre optique de sortie).  For example, an output optical fiber).

On entend ici par a elements optiques passifs de couplage>>, un ensemble d'elements optiques incluant les elements passifs necessaires a ['amplification, comme par exemple ceux assurant la fonction d'isolation etlou la fonction de multiplexage. II peut s'agir d'une micro-lentille, eVou d'un micro 2 5 miroir, eventuellement selectif en longueur d'onde, eVou d'un isolateur, notamment. Les moyens d'amplification et de guidage peuvent se presenter sous diverges formes. Preferentiellement, ils comprennent une fibre optique d'amplification et de guidage, par exemple installee dans une position sensiblement rectiligne ou sous la forme d'un a U >> ou encore sous la forme  The term "passive optical coupling elements" here means a set of optical elements including the passive elements necessary for amplification, such as, for example, those providing the isolation function and / or the multiplexing function. It may be a micro-lens, eVou a mirror microphone, possibly selective in wavelength, eVou an insulator, in particular. The amplification and guidance means may be presented in different forms. Preferentially, they comprise an optical amplification and guidance fiber, for example installed in a substantially rectilinear position or in the form of a U >> or in the form

d'un enroulement constitue d'au moins une boucle.  of a winding constitutes at least one loop.

Les moyens de pompage eVou les moyens d'amplification et de  The pumping means eVou the means of amplification and

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guidage eVou les premiers elements optiques passifs eVou les seconds elements optiques passifs peuvent etre implantes ou integres, totalement ou en partie, sur un substrat. Celui-ci peut etre soit la paroi qui definit le fond du  eVou guidance the first passive optical elements eVou passive second optical elements can be implanted or integrated, totally or partially, on a substrate. This can be either the wall that defines the bottom of the

bo^'tier, soit un element rapporte sur le fond du bo^'tier.  box, an item brought on the bottom of the box.

Le bo^'tier peut comporter une cloison definissant des premiere et seconde zones dans lesquelles vent respectivement implantes les moyens de pompage et les premiers et seconds elements optiques passifs, ou les moyens  The box may comprise a partition defining first and second zones in which respectively wind the pumping means and the first and second passive optical elements, or the means

d'amplification et de guidage.amplification and guidance.

On peut egalement prevoir un ou plusieurs receptacles, tels que des <<queusots>>, pour loger une partie au moins des premiers eVou seconds elements optiques passifs, ces receptacles traversant une paroi du bo^'tier  It is also possible to provide one or more receptacles, such as "bumps", for housing at least a portion of the first eVou second passive optical elements, these receptacles passing through a wall of the housing.

eVou la cloison de separation.eVou the partition wall.

Par ailleu rs, ces moyens d'amplification et de g uid age com portent preferentiellement un materiau choisi dans un groupe comprenant les verres et leurs derives (comme par exemple les verres tellurites, les verres a base de phosphate, les verres a base de silice, les verres a base de bismuth, les verres alumino-silicates, les verres borates, les verres d'alumine, les verres soda lime silice ou les verres germanates, eventuellement dopes par des especes chimiques telles que des ions alcalins ayant notamment pour effet de creer 2 0 des sites accepteurs d'ions terres rares) et les polymeres (comme par exemple en PMMA ou en d'autres materiaux organiques bien connus de l'homme de l'ad). Plus preferentiellement, ce materiau est dope avec un ion ou un complexe de terre rare, comme par exemple l'erbium, le thulium, le neodyme, le praseodyme ou le dysprosium, ou bien avec un ion metallique, comme par exemple le chrome, eventuellement codope avec un ion augmentant la section effficace d'absorption, tel que ['ytterbium, eVou avec un ou plusieurs elements alcalins. Mais en variante, le materiau peut comporter des nano-particules preferentiellement dopees, en phase amorphe ou cristalline (nano-cristaux ou vitro-ceramiques), du type des materieux presentes ci-dessus, et dispersees dans un materiau hote (tel que le verre de silice ou lun des autres materiaux presentes ci-avant). Ces nanoparticules presentent des dimensions  In addition, these amplification and handling means preferably comprise a material chosen from a group comprising glasses and their derivatives (for example tellurite glasses, phosphate-based glasses, silica-based glasses). , bismuth-based glasses, alumino-silicate glasses, borate glasses, alumina glasses, soda lime silica glasses or Germanate glasses, possibly doped with chemical species such as alkaline ions having in particular the effect of create rare earth ion acceptor sites) and polymers (such as PMMA or other organic materials well known to the ad man). More preferably, this material is doped with an ion or a complex of rare earth, such as for example erbium, thulium, neodymium, praseodyme or dysprosium, or with a metal ion, such as for example chromium, optionally codope with an ion increasing the effective absorption section, such as ytterbium, eVou with one or more alkaline elements. Alternatively, the material may comprise preferentially doped nanoparticles, in the amorphous or crystalline phase (nano-crystals or vitro-ceramics), of the type of the materials presented above, and dispersed in a host material (such as glass silica or one of the other materials presented above). These nanoparticles have dimensions

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caracteristiques preferentiellement inferieures au micron, et plus  characteristics preferentially below the micron, and more

preferentiellement encore inferieures a la dizaine de nanometres.  preferentially still below 10 nanometers.

Un ou plusieurs filtres egaliseurs de gain peuvent etre incorpores dans le bo^'tier, notamment pour un fonctionnement << WDM >> (pour Wavelength Division Multiplexing) optimal. Ils vent preferentiellement realises sous la forme  One or more gain equalizing filters may be incorporated into the box, especially for optimum "WDM" (Wavelength Division Multiplexing) operation. They wind preferentially realized in the form

d'empilements de couches minces deposes sur au moins un element optique.  stacks of thin layers deposited on at least one optical element.

Lesdits elements optiques peuvent etre des elements dedies a la fonction d'egalisation de gain eVou preferentiellement des constituents precedemment mentionnes d u d ispositif. Da ns un mode de real isation prefere, un filtre est depose sur 1'une au moins des facettes d'entree et de sortie des moyens  Said optical elements may be elements dedicated to the gain equalization function and preferably to the components previously mentioned of a device. In a preferred embodiment, a filter is deposited on at least one of the input and output facets of the means.

d'amplification et de guidage.amplification and guidance.

D'autre part, au moins certains constituents du dispositif peuvent etre  On the other hand, at least some constituents of the device can be

implantes ou integres, partiellement ou totalement, dans le substrat.  implants or integres, partially or totally, in the substrate.

Le mot << substrat >> doit ici etre compris dans une definition large, c'est-a-dire en tent que moyen de support. 11 peut etre constitue d'une unique couche de matbriau, tel que le silicium ou la silice, ou de plusieurs couches, eventuellement epitaxiees et dont certaines portions (par exemple realisees par lithographic eVou gravure) comportent des dimensions et des  The word "substrate" must here be included in a broad definition, that is to say, in that means of support. It may consist of a single layer of material, such as silicon or silica, or of several layers, possibly epitaxial and some of whose portions (for example made by lithography eVou etching) have dimensions and dimensions.

compositions adaptees au guidage de la lumiere eVou a son amplification.  compositions adapted to guide light eVou its amplification.

Mais, comme indique ci-avant, le substrat peut etre le fond du bo^'tier.  But, as indicated above, the substrate may be the bottom of the box.

Le substrat peut done comporter, en des endroits choisis, un ou plusieurs logements de dimensions appropriees pour recevoir certains au moins des constituents du dispositif. En variante ou en complement, on peut egalement prevoir sur la face superieure du substrat une ou plusieurs portions en saillie formant detrompeur(s) et/ou destinee(s) a recevoir, caler ou centrer  The substrate may therefore comprise, in selected locations, one or more housings of appropriate size to receive at least some of the constituents of the device. Alternatively or in addition, it is also possible to provide on the upper face of the substrate one or more protruding portions forming a protractor (s) and / or destinee (s) to receive, wedge or center

une partie au moins de l'un au moins des moyens ou elements du dispositif.  at least part of at least one of the means or elements of the device.

Le bo^'tier peut en outre comporter des elements auxiliaires, notamment des elements de regulation eVou de controle eVou de commande eVou de couplage eVou de filtrage eVou de multiplexage eVou de  The box may furthermore comprise auxiliary elements, in particular control elements eVou of control eVou of control eVou of eVou coupling of eVou of multiplexing eVou of

demultiplexage eVou de commutation, actifs ou passifs.  demultiplexing eVou switching, assets or liabilities.

Le dispositif selon ['invention est tout particulierement adapte, bien que de fa,con non exclusive, a ['amplification dans le domaine des telecommunications. D'autres caracteristiques et avantages de ['invention appara^'tront a  The device according to the invention is particularly adapted, although non-exclusively, to amplification in the field of telecommunications. Other features and advantages of the invention will be apparent in

l'examen de la description detaillee ci-aprbs, et des dessins annexes, sur  examination of the detailed description below and the accompanying drawings on

lesquels: - la figure 1 illustre de fa,con schematique un premier mode de realisation d'un dispositif d'amplification optique selon ['invention; la figure 2 illustre de fa,con schematique un deuxieme mode de realisation d'un dispositif d'amplification optique selon ['invention; - la figure 3 illustre de fa,con schematique un troisieme mode de realisation d'un dispositif d'amplification optique selon 1'invention; et - la figure 4 illustre de fa,con schematique un quatribme mode de realisation  which: - Figure 1 illustrates schematically a first embodiment of an optical amplification device according to the invention; FIG. 2 schematically illustrates a second embodiment of an optical amplification device according to the invention; FIG. 3 schematically illustrates a third embodiment of an optical amplification device according to the invention; and FIG. 4 illustrates in a diagrammatic way a quatribe embodiment

d'un dispositif d'amplification optique selon ['invention.  an optical amplification device according to the invention.

Les dessins annexes sont, pour l'essentiel, de caractere certain. En consequence, ils pourront non seulement servir a completer ['invention, mais  The attached drawings are, for the most part, of certain character. Consequently, they may not only serve to complete the invention but

aussi contribuer a sa definition, le cas echeant.  also contribute to its definition, as appropriate.

On se refere tout d'abord a la figure 1 pour decrire un premier mode de realisation de dispositif d'amplification selon ['invention. Dans cet exemple, tous les elements constituent le dispositif vent installes sur la face cite < superieure >> 1 d'un substrat 2 monocouche realise, par exemple, en silicium ou en silice. En variante, le substrat pourrait etre de type multicouches, la couche de base etant par exemple en silicium. Le substrat 1 est rapporte sur la  Referring first to Figure 1 to describe a first embodiment of amplification device according to the invention. In this example, all the elements constitute the wind device installed on the "upper" face 1 of a single-layer substrate 2 produced, for example, from silicon or silica. Alternatively, the substrate could be multilayer type, the base layer being for example silicon. The substrate 1 is reported on the

face interieure d'une paroi (non representee) definissant le fond d'un bo^'tier 15.  inner face of a wall (not shown) defining the bottom of a box 15.

Le substrat peut comporter des plots (ou saillies) de centrage eVou de detrompage, par exemp le en si lice, formes a ['aide d ' u ne tech n iq ue tel le q ue la  The substrate may include pins (or projections) for centering or tampering, for example, with the help of a technique such as the

FHD (<< Flame Hydrolysis Deposition >>), ou bien en SiON.  FHD (Flame Hydrolysis Deposition), or in SiON.

D'une manibre generale, la composition du substrat 2 est choisie en fonction des elements qu'il est destine a recevoir (et/ou a integrer), et notamment des fonctions qu'ils doivent exercer, et/ou de l'environnement dans lequel le dispositif final d'amplification doit etre integre. Mais le substrat peut etre egalement choisi en fonction de son falble cout. A cet effet, on pourra  Generally speaking, the composition of the substrate 2 is chosen according to the elements it is intended to receive (and / or to integrate), and in particular the functions that they must perform, and / or the environment in which they are used. which the final amplification device must be integrated. But the substrate can also be chosen according to its low cost. For this purpose, we will

utiliser un substrat en AIN.use an AlN substrate.

Pour les applications dans lesquelles les tolerances de positionnement  For applications in which positioning tolerances

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vent critiques eVou la temperature susceptible de varier, on utilise de preference des materiaux presentant un falble coefficient de dilatation thermique, comme par exemple le COVAR ou l'INVAR. Par ailleurs, pour les applications dans lesquelles la puissance de pompage requise est elevee, on utilise de preference un substrat presentant un coeffficient de diffusion thermique eleve, comme par exemple le silicium. Mais, le substrat peut etre maintenu dans une plage de temperature predeterminee, par chauffage ou  Because of the critical temperature and the temperature which can vary, preference is given to materials having a low coefficient of thermal expansion, such as for example COVAR or INVAR. Furthermore, for applications in which the required pumping power is high, a substrate having a high thermal diffusion coefficient, such as for example silicon, is preferably used. But, the substrate can be maintained in a predetermined temperature range, by heating or

refroidissement, a ['aide d'un dispositif externe ou rapporte au moins en partie.  cooling, using an external device or at least partly reporting.

Les differents elements du dispositif, qui vont etre decrits ci-apres, peuvent etre installes sur ou dans le substrat 2 par toute technique ou combinaison de techniques connue(s) de l'homme de ['art. II pourra notamment s'agir de la technique connue sous le nom d'alignement passif, laquelle consiste a positionner et a fixer des elements optiques en des positions choisies, eventuellement reperees par des elements visuels eVou mecaniques, ou de sa variante automatisee connue sous le nom anglais << pick and place >>, ou encore de la technique d'alignement actif, consistent a positionner et fixer des elements optiques avec une phase d'optimisation du positionnement reposant sur des mesures d'une ou plusieurs caracteristiques optiques tel les que la perte d'insertion, la position d' un point focal, ou  The various elements of the device, which will be described below, can be installed on or in the substrate 2 by any technique or combination of techniques known to those skilled in the art. It may in particular be the technique known as passive alignment, which consists in positioning and fixing optical elements in selected positions, possibly identified by visual eVou mechanical elements, or its automated variant known as pick and place, or the active alignment technique, consists in positioning and fixing optical elements with a positioning optimization phase based on measurements of one or more optical characteristics such as insertion loss, the position of a focal point, or

2 o ['orientation d'un faisceau.2 o ['orientation of a beam.

Par ailleurs la fixation (ou immobilisation) des elements optiques sur le substrat peut etre effectuee, par exemple, par collage eVou soudage laser ou brasage laser (par exemple avec une poudre de verre ou une poudre metallique). 2 5 Sur ce substrat se trouvent rapportes des moyens de pompage optique de type monomode, tels que par exemple une diode laser 3 delivrant un faisceau de lumiere d'une longueur d'onde (et done d'une energie) adaptee a la transition de constituents des moyens d'amplification et de guidage (tels que par exemple des ions erbIum) vers certains niveaux d'energie, dans des 3 0 conditions telles que ['emission stimulee devient plus importante que ['absorption et que de ce fait le gain au sein des moyens d'amplification et de guidage devient positif permettant ainsi une amplification du signal lumineux requ. La diode laser 3, monomode, est couplee a des moyens d'amplification et de guidage 4 par l'intermediaire d'elements optiques passifs de couplage bien connus de l'homme de l'art et schematises ici, de facon non  Furthermore, the fixation (or immobilization) of the optical elements on the substrate can be carried out, for example, by gluing eVou laser welding or laser brazing (for example with a glass powder or a metal powder). On this substrate are reported monomode type optical pumping means, such as for example a laser diode 3 delivering a beam of light of a wavelength (and therefore of an energy) adapted to the transition of components of the amplification and guidance means (such as, for example, erbium ions) towards certain energy levels, under conditions such that the stimulated emission becomes more important than the absorption and thereby the gain. within the amplification and guiding means becomes positive thus allowing an amplification of the light signal requ. The single-mode laser diode 3 is coupled to amplification and guidance means 4 via passive coupling optical elements well known to those skilled in the art and schematized here, in a non-limiting manner.

limitative, par des micro-lentilles 5, 6 et un micro-miroir semireflechissant 7.  by microlenses 5, 6 and a semireflecting micromirror 7.

Dans cet exemple, les moyens d'amplification et de guidage comportent preferentiellement une fibre optique d'amplification et de guidage 4 installee dans une position sensiblement rectiligne sur la surface superieure 1 du substrat 2. Ii est indispensable que la fibre optique d'amplification assure le guidage de la lumiere (ou signal) a amplifier et le guidage de l'energie de  In this example, the amplification and guidance means preferably comprise an optical fiber amplification and guidance 4 installed in a substantially rectilinear position on the upper surface 1 of the substrate 2. It is essential that the optical fiber amplification ensures guiding the light (or signal) to be amplified and guiding the energy of

pompage deilvree par le laser de pompe.  pumping deilvree by the pump laser.

Typiquement, la fibre d'amplification et de guidage 4 presente une longueur d'environ 50 mm (millimetres). Mais bien entendu, cette longueur est  Typically, the amplification and guide fiber 4 has a length of about 50 mm (millimeters). But of course, this length is

choisie en fonction des besoins.chosen according to the needs.

Le milieu d'amplification de la fibre d'amplification et de guidage 4 est par exemple un verre, ou un derive de verre, dope de preference avec un ion ou un complexe de terre rare, comme par exemple l'erbium, le thulium, le neodyme, ie praseodyme, ou le dysprosium, ou bien avec un ion metallique, comme par exemple le chrome. On peut egalement prevoir un codopant  The amplification medium of the amplification and guiding fiber 4 is for example a glass, or a glass derivative, preferably doping with an ion or a complex of rare earth, such as for example erbium, thulium, neodymium, ie praseodymium, or dysprosium, or with a metal ion, such as chromium. One can also provide a codopant

augmentant la section efficace d'absorption, tel que ['ytterbium.  increasing the absorption cross section, such as ytterbium.

Parmi les verres et derives de verre particulierement interessants pour accueillir les dopants et codopants, on peut citer les verres tellurites, les verres a base de phosphate, les verres a base de silice, les verres a base de bismuth, les verres alumino-silicates, les verres borates, les verres d'alumine, les verres soda lime silice ou les verres germanates, eventuellement dopes 2 5 par des especes chimiques telles que des ions alcalins ayant notamment pour effet de creer des sites accepteurs d'ions terres rarest En variante, le verre peut egalement comporter des nanoparticules  Particularly interesting glasses and glass derivatives for dopants and codopants include tellurite glasses, phosphate-based glasses, silica-based glasses, bismuth-based glasses, aluminosilicate glasses, borate glasses, alumina glasses, silica soda lime glasses or Germanate glasses, optionally doped with chemical species such as alkaline ions, in particular having the effect of creating rare earth ion accepting sites. the glass may also include nanoparticles

d'amplification, preferentiellement dopees, en phase amorphe ou cristalline.  of amplification, preferentially doped, in amorphous or crystalline phase.

Dans ce demier cas, on parle alors de nano-cristaux ou vitro-ceramiques. Ces nanoparticules vent dispersees dans un materieu hote (tel que le verre de silice ou l'un des autres materiaux presentes ci-avant). Leurs dimensions caracteristiques vent preferentiellement inferieures au micron, et plus  In this last case, we then speak of nano-crystals or vitro-ceramics. These nanoparticles wind dispersed in a host material (such as silica glass or one of the other materials presented above). Their characteristic dimensions are preferentially less than one micron, and more

preferentiellement encore inferieures a la dizaine de nanometres.  preferentially still below 10 nanometers.

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De meme, au lieu d'un verre ou de l'un de ses derives, on peut utiliser une fibre en polymeres (par exemple en PM MA (<< Poly-Methyl-Metacrylate), ou d'autres materiaux organiques bien-connus de l'homme de ['art, tels que ceux decrits, par exemple, dans la these << Rare-earth doped polymer waveguides and light emitting diodes >> de Lenneke H. Slooff, ou dans l'ouvrage << L'optoelectronique moleculaire au CNET Bagneux 1975-1996,  Similarly, instead of a glass or one of its derivatives, it is possible to use a polymer fiber (for example PMMA ("Poly-Methyl-Metacrylate)" or other well-known organic materials. of the art man, such as those described, for example, in Lenneke H. Slooff's "Rare-earth doped polymer waveguides and light emitting diodes", or in the book "Optoelectronics". at CNET Bagneux 1975-1996,

selection des principales publications >> de Joseph Zyss, ed. France Telecom).  selection of the main publications >> by Joseph Zyss, ed. France Telecom).

Dans certaines circonstances, on pourra egalement envisager d'utiliser des cristaux (comme par exemple les monocristaux, polycristaux ou ceramiques de YAG (Grenat Yttrium-Aluminium), d'WO4 (Vanadate d'Yttrium), de CAS (Calcium-Aluminium-Strontium), de niobate de lithium, d'YSO, de CNGG,  In certain circumstances, it is also possible to envisage the use of crystals (for example YAG (Yttrium-Aluminum Garnet), WO4 (Yttrium Vanadate), CAS (Calcium-Aluminum-Strontium) monocrystals, polycrystals or ceramics. ), lithium niobate, YSO, CNGG,

d'YSGG, d'Alumine ou d'YAP).YSGG, Alumina or YAP).

Comme le salt l'homme de ['art, les fibres dopees erblum vent particulierement interessantes dans la mesure ou elles offrent un rapport amplification / pertes eleve pour une lumiere dont la longueur d'onde est de 1550 nm (nanometres), laquelle est tres utilisee dans le domaine des communications optiques. Plus precisement, dans ce domaine de longueur d'onde l'amplificateur est tres peu sensible a la polarisation de la lumiere et presente une plage de gain large (typiquement 30 nm) et de falbles pertes  As the man of the art, the dope fibers erblum wind particularly interesting in that they offer a ratio amplification / high losses for a light whose wavelength is 1550 nm (nanometers), which is very used in the field of optical communications. More specifically, in this wavelength range the amplifier is very insensitive to light polarization and has a wide gain range (typically 30 nm) and low losses.

2 0 d'insertion.Insertion.

Lorsque la lumiere a amplifier presente une longueur d'onde d'environ 1550 nm et que l'amplificateur 4 est une fibre dopee erblum, on peut utiliser une diode laser de pompage 3 delivrant un faisceau de pompage d'une longueur d'onde d'environ 980 nm ou d'environ 1480 nm, ou dans certains cas  When the light to be amplified has a wavelength of about 1550 nm and the amplifier 4 is a doped erblum fiber, it is possible to use a pump laser diode 3 delivering a pump beam having a wavelength of about 980 nm or about 1480 nm, or in some cases

2 5 d'environ 800 nm (par exemple en cas de co-dopage Ytterbium).  Approximately 800 nm (for example in the case of Ytterbium co-doping).

L'extremite de la fibre optique 4, qui est couplee a la diode laser 3, est egalement couplee a des moyens de guidage de lumiere 8 dans lesquels circule la lumiere a amplifier (ou signal, par exemple a 1550 nary). Dans l'exemple illustre les moyens de guidage 8 vent realises sous la forme d'une 3 0 fibre optique d'alimentation. Par ailleurs, le couplage entre cette fibre d'alimentation 8 et la fibre d'amplification et de guidage 4 s'effectue a ['aide d'elements optiques passifs, de couplage, bien connus de l'homme de l'art et schematises ici, de fa,con non limitative, par une micro-lentille 9, un isolateur  The end of the optical fiber 4, which is coupled to the laser diode 3, is also coupled to light guiding means 8 in which the light to be amplified (or signal, for example at 1550 nm) circulates. In the example, the guiding means 8 is produced in the form of a feed optical fiber. Moreover, the coupling between this supply fiber 8 and the amplification and guiding fiber 4 is carried out using passive optical elements, coupling, well known to those skilled in the art and schematises. here, in a nonlimiting manner, by a micro-lens 9, an insulator

et les micro-miroir semi-reflechissant 7 et micro-lentille 6.  and the semi-reflective micro-mirror 7 and micro-lens 6.

L'extremite opposee de la fibre optique 4 est couplee a des moyens de guidage de lumiere 11 destines a collecter la lumiere amplifiee en presence de i'energie de pompage. Dans l'exemple illustre les moyens de guidage 11 vent realises sous la forme d'une fibre optique de collection. Par ailleurs, le couplage entre cette fibre de collection 11 et la fibre d'amplification et de guidage 4 s'effectue a ['aide d'elements optiques passifs, de couplage, bien connus de l'homme de l'art et schematisbs ici, de fa,con non limitative, par des  The opposite end of the optical fiber 4 is coupled to light guiding means 11 for collecting the amplified light in the presence of the pumping energy. In the example, the guiding means 11 is carried out in the form of a collection optical fiber. Moreover, the coupling between this collection fiber 11 and the amplification and guide fiber 4 is carried out using passive optical coupling elements, which are well known to those skilled in the art and schematisbs here. , in a non-limiting way, by

micro-lentilles 12, 13 et un isolateur 14.  microlenses 12, 13 and an insulator 14.

Les extremites des fibres d'alimentation 8 et de collection 10, opposees aux isolateurs, traversent une paroi << avant >> du bo^'tier 15, par des  The ends of the feed and collection fibers 10, opposed to the insulators, pass through a "front" wall of the box 15, by means of

orifices preferentiellement agences de maniere a assurer l'hermeticite.  orifices preferably arranged in such a way as to ensure hermeticity.

Typiquement, un dispositif d'amplification comportant une configuration du type de celle illustree sur la figure 1 peut presenter des dimensions de l'ordre de 90 mm x 25 mm x 12 mm, alors que les dimensions des dispositifs de l'art anterieur vent typiquement de l'ordre de 90 mm x 70 mm  Typically, an amplification device having a configuration of the type of that illustrated in FIG. 1 may have dimensions of the order of 90 mm × 25 mm × 12 mm, whereas the dimensions of the devices of the prior art typically wind. of the order of 90 mm x 70 mm

x 12 mm.x 12 mm.

Les moyens d'amplification et de guidage vent preferentiellement traites anti-reflet, a la longueur d'onde du signal a amplifier, au niveau des 2 0 facettes d'entree et de sortie du signal. II en va de meme de la (des) facette(s) d'entree de la (des) pompes, a la (aux) longueur(s) d'onde de pompage. Les  The amplification and guidance means wind preferably anti-reflective, at the wavelength of the signal to be amplified, at the input and output facets of the signal. The same applies to the inlet facet (s) of the pump (s), to the pumping wave length (s). The

techniques de traitement anti-reflet vent bien connues de l'homme de ['art.  Anti-reflective treatment techniques are well known to those skilled in the art.

Pour une utilisation du dispositif avec un signal de type << WDM >>, les traitements anti-reflet, a la longueur d'onde du signal a amplifier, realises au niveau des facettes d'entree et de sortie du signal, vent preferentiellement  For use of the device with a "WDM" type signal, the anti-reflection treatments, at the wavelength of the signal to be amplified, made at the input and output facets of the signal, preferentially wind

definis de maniere a former un filtre egaliseur de gain.  defined to form a gain equalizer filter.

Par ailleurs, on peut egalement etre amene a orienter d'un angle de, typiquement, quelques degree, la normale d'une facette au moins par rapport a  On the other hand, it is also possible to orientate at an angle of, typically, a few degrees, the normal of a facet at least with respect to

l'axe optique, afin d'evacuer du chemin optique la lumiere parasite reflechie.  the optical axis, in order to evacuate the optical path reflected reflective light.

Les techniques d'orientation vent egalement bien connues de l'homme de ['art. Bien entendu, on pourrait envisager de nombreuses autres configurations que celle illustree sur la figure 1 a titre d'exemple. Par consequent, les moyens optiques de couplage implantes sur le substrat 2 varieront selon les  Orientation techniques are also well known to those skilled in the art. Of course, one could consider many other configurations than that illustrated in Figure 1 by way of example. Therefore, the optical coupling means implanted on the substrate 2 will vary according to the

configurations et les besoins.configurations and needs.

Dans l'exempie qui vient d'etre decrit en reference a la figure 1, le substrat 1 est rapporte sur le fond d'un bo^'tier 15. Mais, dans une variante, le  In the example which has just been described with reference to FIG. 1, the substrate 1 is carried on the bottom of a box 15. But, in a variant, the

substrat 1 peut etre la paroi definissant ledit fond du bo^tier 15.  substrate 1 may be the wall defining said bottom of box 15.

On se refere maintenant a la figure 2 pour decrire un deuxieme mode de realisation de dispositif d'amplification selon ['invention. II s'agit d'une variante du dispositif illustre sur la figure 1, dans laquelle la fibre optique 4 n'est plus implantee dans une position rectiligne, mais conformee de maniere a constituer un enroulement d'une ou plusieurs boucles. Dans ce cas, le diametre de la boucle peut etre de l'ordre de 20 a 30 mm (millimetres) et une longueur totale de fibre d'environ 1 m (metre) peut etre aisement obtenue, si necessaire. Dans cette variante, le substrat 1 est egalement rapporte sur le  Referring now to Figure 2 to describe a second embodiment of amplification device according to the invention. This is a variant of the device shown in Figure 1, wherein the optical fiber 4 is no longer implanted in a rectilinear position, but conformed so as to constitute a winding of one or more loops. In this case, the diameter of the loop may be of the order of 20 to 30 mm (millimeters) and a total fiber length of about 1 m (meter) can be easily obtained, if necessary. In this variant, the substrate 1 is also reported on the

fond du bo^tier 15 ou constitue ledit fond.  bottom of box 15 or constitutes said bottom.

Dans une autre variante, non iliustree, on pourrait utiliser une fibre conformee en U. On se refere maintenant a ia figure 3 pour decrire un troisieme mode de realisation de dispositif d'amplification selon ['invention. II s'agit d'une variante du dispositif illustre sur la figure 2, dans laquelle on prevoit a l'interieur  In another variant, not iliustree, one could use a U-shaped fiber. Reference is now made to FIG. 3 to describe a third embodiment of amplification device according to the invention. This is a variant of the device shown in Figure 2, in which is provided inside

du bo'^tier 15, une cloison de separation 16 definissant deux zones 17 et 18.  box 15, a partition wall 16 defining two areas 17 and 18.

2 0 Dans la premiere zone 17 vent preferentiellement loges le laser de pompe 3 et les elements optiques passifs (micro-lentilles 5, 6, 9, 12 et 13, isolateurs 10 et 14, et micro-miroir semi-reflechissant 7). Dans la seconde zone 18 est preferentiellement logee la fibre optique d'amplification et de guidage 4, ainsi  In the first zone 17 wind preferentially housed the pump laser 3 and the passive optical elements (micro-lenses 5, 6, 9, 12 and 13, insulators 10 and 14, and semi-reflective micro-mirror 7). In the second zone 18 is preferentially accommodated the optical fiber amplification and guidance 4, and

qu'eventuellement l'electronique de commande et/ou de regulation.  than possibly the control and / or control electronics.

Les extremites de la fibre optique d'amplification et de guidage 4 traversent la cloison 16 au niveau de traversees (ou orifices), de maniere a deboucher dans la premiere zone 17, sensiblement en regard des micro  The ends of the optical fiber amplification and guidance 4 through the partition 16 at the crossings (or orifices), so as to lead into the first zone 17, substantially facing the micro

lentilles 6 et 13.lenses 6 and 13.

Preferentiellement, la cloison 16 et ses traversees assurent I'hermeticite entre la premiere zone 17, contenant le laser de pompe 3, et la seconde zone 18, contenant la fibre optique 4. Cela permet en effet d'eviter  Preferentially, the partition 16 and its bushings provide hermeticity between the first zone 17, containing the pump laser 3, and the second zone 18, containing the optical fiber 4. This makes it possible to avoid

que la fibre d'amplification ne pollue le laser.  that the amplification fiber does not pollute the laser.

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Dans cet exemple de realisation, le substrat 1 est egalement rapporte sur le fond du bo^'tier 15 ou constitue ledit fond. Ce substrat peut etre eventuellement en deux parties, I'une supportant les elements passifs et le laser, I'autre supportant la fibre d'amplification et de guidage. Cette variante est plus particulierement adaptee au cas ou le substrat constitue le fond du bo^'tier, ce dernier pouvant par ailleurs etre constitue de deux sous-bo^'tiers  In this embodiment, the substrate 1 is also reported on the bottom of box 15 or constitutes said bottom. This substrate may be optionally in two parts, one supporting the passive elements and the laser, the other supporting the amplification fiber and guide. This variant is more particularly adapted to the case where the substrate constitutes the bottom of the box, the latter can also be constituted of two sub-boxes.

solidarises l'un a l'autre et separes par la cloison 16.  secured to one another and separated by the partition 16.

Certains au moins des elements presentes ci-dessus peuvent etre partiellement ou totalement implantes dans des logements adaptes formes dans le substrat 2, ou dans l'une au moins de ses couches lorsqu'il presente une configuration multicouches. Cela peut permettre de reduire  At least some of the elements presented above may be partially or totally implanted in adapted housings formed in the substrate 2, or in at least one of its layers when it has a multilayer configuration. This can help reduce

l'encombrement du dispositif d'amplification.  the size of the amplification device.

Certains logements peuvent servir au positionnement precis des elements optiques. Ils peuvent etre accompagnes ou remplaces par des saillies (plots, butees) servant de reperes (detrompeurs) visuels eVou mecaniques ou de cales ou encore de moyens de fixation, notamment dans le cadre d'un alignement passif. Par exemple, on peut former un sillon en V par gravure pour positionner la fibre dopee eVou les extremites des fibres d'entree et de sortie. On peut egalement former un logement ou un plot 2 0 parallelepipedIque pour fixer la puce du laser de pompe ou un isolateur. On peut encore former un sillon en U pour positionner un micro-miroir traite  Some housing can be used for the precise positioning of the optical elements. They may be accompanied or replaced by protrusions (studs, stops) serving as mechanical eVou visual detrompors or wedges or fastening means, particularly in the context of a passive alignment. For example, a V groove can be formed by etching to position the doped fiber eV or the ends of the input and output fibers. A parallelepipedic housing or pad may also be formed to secure the pump laser chip or insulator. One can still form a U groove to position a micro-mirror treats

antireflet ou une micro-lentille.antireflection or a micro-lens.

De tels logements ou saillies peuvent etre obtenus par tous moyens connus de l'homme de ['art, comme par exempie par gravure (notamment par gravure ionique reactive (RIE)) eVou lithographic. Mais d'autres techniques peuvent etre utilisees comme par exemple la FHD (Flame Hydrolysis  Such housings or protrusions can be obtained by any means known to those skilled in the art, such as for example by etching (in particular by reactive ion etching (RIE)). But other techniques can be used as for example the FHD (Flame Hydrolysis

Deposition) en particulier pour la silice, ou l'usinage laser ou electronique (<< e-  Deposition) in particular for silica, or laser or electronic machining ("e-

beam >>).beam >>).

On se refere maintenant a la figure 4 pour decrire un quatrieme mode de realisation de dispositif d'amplification selon ['invention. II s'agit d'une variante du dispositif illustre sur la figure 3, dans laquelle seule une partie des constituents du dispositif est implantee sur le substrat 1, qui est de preference  Referring now to Figure 4 to describe a fourth embodiment of amplification device according to the invention. This is a variant of the device illustrated in FIG. 3, in which only part of the components of the device is implanted on the substrate 1, which is preferably

constitue par le fond du bo^'tier.constitutes by the bottom of the box.

Plus precisement, dans cette variante, le laser de pompe 3 et la micro-  More precisely, in this variant, the pump laser 3 and the micro-laser

lentille 5 vent instailes sur le substrat 1, dans la premiere zone 17, tandis que la fibre optique d'amplification et de guidage 4 est installee sur le substrat 1, dans la seconde zone 18. On peut egalement envisager que le substrat comporte deux soul-parties rapportees dans deux sousboA'tiers constituent le  lens 5 wind instailes on the substrate 1 in the first area 17, while the optical fiber amplification and guidance 4 is installed on the substrate 1 in the second zone 18. It can also be envisaged that the substrate comprises two soul -parts reported in two sousboA'tiers constitute the

bo^'tier 15, ou constituent les fonds de ces deux sous-bo^tiers.  box 15, or constitute the funds of these two sub-booths.

Les autres elements optiques passifs vent desormais loges au moins en partie dans un, ou, comme illustre, dans plusieurs receptacles appeles << queusots >>. Dans l'exemple illustre, un premier queusot 19 loge la micro lentille 9, I'isolateur 10, le micro-miroir 7 et l'extremite de la fibre d'alimentation 8, un deuxieme queusot 20 loge la micro-lentille 6, un troisieme queusot 21 loge la micro-lentille 12, et un quatrieme queusot 22 loge l'isolateur 14, la  The other passive optical elements are now housed at least partly in one or, as illustrated, in several receptacles called "queues". In the example shown, a first tube 19 houses the micro lens 9, the isolator 10, the micro-mirror 7 and the end of the feed fiber 8, a second tube 20 houses the micro-lens 6, a third port 21 houses the micro-lens 12, and a fourth port 22 houses the isolator 14, the

micro-lentille 13 et l'extremite de la fibre de collection 1 1.  micro-lens 13 and the end of the collection fiber 1 1.

Les premier 19 et quatrieme 22 queusots traversent la paroi << avant >> 23 du bo'Atier 15, par des orifices ou traversees agences, de preference, de maniere a assurer l'hermeticite. Ils debouchent par consequent dans la premiere zone 17 et a l'exterieur du bo'Atier 15. Les deuxiemes 20 et troisiemes 21 queusots traversent la cloison 16, par des orifices ou traversees agences, de preference, de maniere a assurer l'hermeticite. Ils debouchent par  The first 19 and fourth 22 tanks pass through the "front" wall 23 of the Bo'Atier 15, through orifices or bushings, preferably, so as to ensure hermeticity. They consequently open in the first zone 17 and outside the bo'Atier 15. The second 20 and third 21 ducts pass through the partition 16, through orifices or crossing agencies, preferably, so as to ensure hermeticity. They open by

consequent dans les premiere 17 et seconde 18 zones. Par ailleurs, les micro-  in the first 17 and second 18 zones. In addition, micro-

lentilles peuvent etre utilisees pour assurer l'hermeticite au niveau des queusots. Le but de cette configuration est toujours, preferentiellement, d'eviter  lenses can be used to ensure hermeticity at the level of the bores. The purpose of this configuration is always, preferentially, to avoid

que le laser ne soit pollue par la fibre d'amplification.  that the laser is polluted by the amplification fiber.

Lorsque les traversees ou orifices vent places a un niveau plus eleve que le substrat, on sureleve les elements implantes dans les zones 17 et 18  When the crossings or orifices are placed at a higher level than the substrate, the implant elements are raised in zones 17 and 18

(pompe, micro-lentille et fibre d'amplification).  (pump, micro-lens and amplification fiber).

Dans ce mode de realisation, les constituents du dispositif vent done implantes dans ie bo^'tier 15, soit directement sur le substrat (ou le fond), soit  In this embodiment, the constituents of the device are therefore implanted in box 15, either directly on the substrate (or the bottom), or

par l'intermediaire de receptacles (queusots).  through receptacles (queuots).

Le bo^'tier 15 du dispositif selon ['invention pourra comporter plusieurs moyens de pompage 3, plusieurs moyens d'amplification et de guidage 4, plusieurs premiers elements optiques passifs 6, 7, 9, 10, et plusieurs seconds elements optiques passifs 12 a 14, ainsi qu'eventuellement plusieurs elements  The box 15 of the device according to the invention may comprise a plurality of pumping means 3, a plurality of amplification and guidance means 4, a plurality of first passive optical elements 6, 7, 9, 10, and a plurality of second passive optical elements 12. at 14, as well as possibly several elements

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auxiliaires, de maniere a constituer un amplificateur multivoies (ou une  auxiliary devices, so as to constitute a multi-channel amplifier (or a

a barrette d'amplificateurs >>).amplifier bar >>).

L'invention ne se limite pas aux modes de realisation decrits ci-avant,  The invention is not limited to the embodiments described above,

seulement a titre d'exemple, mais elle englobe toutes les variantes que pourra  only as an example, but it encompasses all the variants that

envisager l'homme de l'art dans le cadre des revendications ci-apres.  consider those skilled in the art within the scope of the claims below.

Le dispositif selon ['invention peut comporter d'autres elements que ceux presentes ci-avant, optiques ou non, de preference passifs, mais pasnecessairement. Par exemple, il pourra s'agir de multiplexeurs de longueur d'onde pompe-signal, eVou de filtres egaliseurs statiques ou variables, eVou d'attenuateurs statiques ou variables, eVou de filtres rejecteurs, eVou de moyens de regulation de la temperature du milieu d'amplification et de guidage, eVou de moyens de regulation de la temperature du laser de pompe, ou de moyens de regulation de la temperature du dispositif complet, eVou de moyens de controle de la puissance optique du signal a amplifier eVou du signal amplifie, eVou de moyens de controle de la puissance du laser de pompe, eVou une electronique compacte de commande telle qu'un ASIC ou un << cube 3D >> du type de ceux commercialises par la societe 3Dplus, eVou d'un filtre egaliseur de gain statique eVou dynamique, eVou d'un attenuateur optique variable (<< VOA >>), eVou des moyens de filtrage selectif en longueur d'onde, par exemple pour rejeter une bande de longueur d'onde differente de la bande de longueur d'onde du signal a amplifier, eVou des moyens de multiplexage de canaux, eVou des moyens de demultiplexage de canaux,  The device according to the invention may comprise elements other than those presented above, optical or otherwise, preferably passive, but not necessarily. For example, it may be pump-signal wavelength multiplexers, eVou static or variable equalizing filters, eVou static or variable attenuators, eVou rejectbiter filters, eVou means of regulation of the temperature of the medium amplifying and guiding, eVou means for regulating the temperature of the pump laser, or means for regulating the temperature of the complete device, eVou means for controlling the optical power of the signal to amplify eVou of the amplified signal, eVo means of control of the power of the pump laser, eVou a compact control electronics such as an ASIC or a "3D cube" of the type of those marketed by the company 3Dplus, eVou a gain equalizer filter static dynamic eVou, eVou of a variable optical attenuator (<< VOA >>), eVou means of selective filtering in wavelength, for example to reject a band of wavelength different from the band of length of signal wave ampl ifier, eVou channel multiplexing means, eVou means of demultiplexing channels,

eVou des moyens de commutation.eVou switching means.

Par ailleurs, on a presente un exemple de realisation utilisant une fibre d'amplification dopee erbium, destinee a amplifier un signal dont la longueur d'onde est comprise entre environ 1525 nm et 1610 nm. Mais, d'autres bandes de longueur d'onde peuvent etre envisagees. Ainsi, un dispositif selon ['invention, equipe d'une fibre dopee thulium, peut amplifier un signal dont la longueur d'onde est comprise entre environ 1450 nm et 1520 nm, a ['aide d'un laser de pompe delivrant une ou plusieurs longueurs d'onde d'environ 1060  On the other hand, an exemplary embodiment using an erbium-doped amplification fiber for amplifying a signal whose wavelength is between about 1525 nm and 1610 nm has been presented. But other bands of wavelength can be considered. Thus, a device according to the invention, equipped with a thulium-doped fiber, can amplify a signal whose wavelength is between about 1450 nm and 1520 nm, by means of a pump laser delivering one or several wavelengths of about 1060

nm eVou 1240 nm eVou 1550 nm.nm eVou 1240 nm eVou 1550 nm.

De nombreuses applications peuvent etre envisagees pour le dispositif selon ['invention. Ainsi, il peut servir d'amplificateur de puissance (<< booster >>)  Many applications can be envisaged for the device according to the invention. Thus, it can serve as a power amplifier (<< booster >>)

14 283729014 2837290

ou de pre-amplificateur dans les equipements a terminaux >> (en emission ou en reception), qu'ils solent localises a l'extremite d'une ligne a point-a-point >> ou a un nccud de reseau, par exemple sur le port d'insertion ou d'extraction d'un multiplexeur optique d'insertion/extraction (<< 0ADM >>). Dans ce cas, on peut amplifier un canal choisi ou un soul-multiplex (ou sous-bande) du multiplex de transmission. On pourrait egalement envisager une application de type << WDM >> pour ['amplification en ligne du multiplex principal ou d'une bande de ce multiplex central, comme par exemple la bande C dans un systeme C + L ou C represente typiquement la bande 1529 - 1561 nm et L  or pre-amplifier in terminal equipment "(in transmission or reception), whether they are located at the end of a point-to-point line or a network node, for example on the insertion or extraction port of an optical add / drop multiplexer (<< 0ADM >>). In this case, it is possible to amplify a selected channel or a soul-multiplex (or sub-band) of the transmission multiplex. One could also consider a "WDM" type application for the on-line amplification of the main multiplex or a band of this central multiplex, such as for example the C-band in a C + L system where C typically represents the band. 1529 - 1561 nm and L

represente typiquement la bande 1569 -1603 nm.  typically represents the band 1569 -1603 nm.

Claims (28)

REVENDICATIONS 1. Dispositif d'amplification optique, caracterise en ce qu'il comprend un bo^tier (15) comportant des moyens de pompage optique (3) propres a delivrer une energie de pompage, des moyens d'amplification et de guidage de lumiere (4) propres a recevoir et guider ladite energie de pompage et une lumiere a amplifier et a delivrer une lumiere amplifiee, des premiers elements optiques passifs de couplage (6,7,9,10) propres a recevoir ladite lumiere a amplifier de premiers moyens de guidage (8) et a alimenter lesdits moyens d'amplification de lumiere (4) avec cette lumiere a amplifier, et des seconds elements optiques passifs de couplage (12-14) propres a collecter ladite lumiere amplifiee par lesd its moyens d'amplification (4), en presence de lad ite energie de pompage, pour la delivrer a des seconds moyens de guidage de  1. Optical amplification device, characterized in that it comprises a box (15) comprising optical pumping means (3) for delivering pumping energy, means for amplifying and guiding light ( 4) adapted to receive and guide said pumping energy and a light to amplify and deliver an amplified light, first passive optical coupling elements (6,7,9,10) adapted to receive said light to amplify first means of guiding (8) and feeding said light amplifying means (4) with this light to be amplified, and second passive optical coupling elements (12-14) able to collect said amplified light by said amplification means ( 4), in the presence of the pumping energy lad, to deliver it to second guide means of lumiere (11).light (11). 2. Dispositif selon la revendication 1, caracterise en ce que l'un au moins des moyens de pompage (3), des moyens d'amplification et de guidage (4), des premiers elements optiques passifs (6,7,9,10) et des seconds  2. Device according to claim 1, characterized in that at least one of the pumping means (3), the amplification and guidance means (4), the first passive optical elements (6,7,9,10 ) and seconds elements optiques passifs (12-14) est implante sur un substrat (2).  passive optical elements (12-14) is implanted on a substrate (2). 3. Dispositif selon la revendication 2, caracterise en ce que les moyens de pompage (3), les moyens d'amplification et de guidage (4), les premiers elements optiques passHs (6,7,9,10) et les seconds elements optiques passifs  3. Device according to claim 2, characterized in that the pumping means (3), the amplification and guidance means (4), the first optical elements passHs (6,7,9,10) and the second elements passive optics (12-14) vent implantes sur ledit substrat (2).  (12-14) implants on said substrate (2). 4. Dispositif selon l'une des revendications 2 et 3, caracterise en ce que  4. Device according to one of claims 2 and 3, characterized in that 2 5 ledit substrat (2) est une paroi definissant le fond audit bo'^tier (15).  Said substrate (2) is a wall defining the bottom of said box (15). 5. Dispositif selon l'une des revendications 2 et 3, caracterise en ce que  5. Device according to one of claims 2 and 3, characterized in that ledit substrat (2) est rapporte sur une paroi definissant ie fond audit bo^'tier (15).  said substrate (2) is mounted on a wall defining the bottom of said box (15). 6. Dispositif selon l'une des revendications 2 a 5, caracterise en ce que  6. Device according to one of claims 2 to 5, characterized in that ledit bo^'tier comporte une cloison (16) definissant une premiere zone (17), dans laquelle vent implantes les moyens de pompage (3), les premiers elements optiques passifs (6,7,9,10) et les seconds elements optiques passifs (12-14), et une seconde zone (18), dans laquelle vent implantes les moyens  said box comprises a partition (16) defining a first zone (17), in which wind implements the pumping means (3), the first passive optical elements (6, 7, 9, 10) and the second optical elements passive (12-14), and a second zone (18), in which wind implants the means 16 283729016 2837290 d'amplification et de guidage (4).amplification and guidance (4). 7. DispositK selon l'une des revendications 2, 4, 5 et 6, caracterise en  7. Device according to one of claims 2, 4, 5 and 6, characterized in ce qu'une partie au moins des premiers eldments optiques passifs (6,7,9, 10) et des seconds elements optiques passifs (12-14), est implantee dans au moins un receptacle traversant une paroi (23) audit bo^'tier (15) et/ou ladite cloison (16).  at least a portion of the first passive optical elements (6, 7, 9, 10) and passive second optical elements (12-14) are implanted in at least one receptacle passing through a wall (23) in said box tier (15) and / or said partition (16). 8. Dispositif selon l'une des revendications 1 a 7, caracterise en ce que  8. Device according to one of claims 1 to 7, characterized in that lesdits moyens d'amplification et de guidage (4) comportent un materiau choisi dans un groupe comprenant les verres, les derives des verres et les  said amplifying and guiding means (4) comprise a material selected from a group comprising glasses, glass derivatives and 1 0 polymeres.Polymers. 9. D ispositif selon la revend ication 8, caracterise en ce q ue led it  9. D ispositif according to claim ication 8, characterized in that it led it materiau est dope avec un ion ou un complexe de terre rare.  Material is doped with an ion or rare earth complex. 10. Dispositif selon la revendication 9, caracterise en ce que l'ion ou le complexe de terre rare est choisi dans un groupe comprenant le thulium,  10. Device according to claim 9, characterized in that the ion or the rare earth complex is chosen from a group comprising thulium, I'erblum, le neodyme, le praseodyme et le dysprosium.  I'erblum, neodymium, praseodyme and dysprosium. 11. Dispositif selon la revendication 8, caracterise en ce que ledit  11. Device according to claim 8, characterized in that said materiau est dope avec un ion metallique, en particulier le chrome.  material is doped with a metal ion, especially chromium. 12. Dispositif selon la revendication 8, caracterise en ce que ledit  12. Device according to claim 8, characterized in that said materiau comporte des nano-particules dopees.  material contains doped nanoparticles. 13. Dispositif selon l'une des revendications 1 a 12, caracterise en ce  13. Device according to one of claims 1 to 12, characterized in that que lesdits moyens d'amplification et de guidage comprennent une fibre  that said amplification and guidance means comprise a fiber optique de guidage et d'amplification (4).  optical guidance and amplification (4). 14. Dispositif selon la revendication 13, caracterise en ce que ladite fibre  14. Device according to claim 13, characterized in that said fiber optique (4) est installee dans une position sensiblement rectiligne.  optical (4) is installed in a substantially rectilinear position. 15. Dispositif selon la revendication 13, caracterise en ce que ladite fibre optique (4) est disposee sensiblement sous la forme d'un U.  15. Device according to claim 13, characterized in that said optical fiber (4) is arranged substantially in the form of a U. 16. Dispositif selon la revendication 13, caracterise en ce que ladite fibre optique (4) est disposee sous la forme d'un enroulement constitue d'au moins16. Device according to claim 13, characterized in that said optical fiber (4) is arranged in the form of a winding constitutes at least une boucle.a loop. 17. Dispositif selon l'une des revendications 2 a 16, caracterise en ce  17. Device according to one of claims 2 to 16, characterized in that que lesdits moyens d'amplification et de guidage (4) vent rapportes sur une  said amplifying and guiding means (4) is connected to a face superieure (1) du substrat (2).  upper face (1) of the substrate (2). 18. Dispositif selon l'une des revendications 2 a 17, caracterise en ce  18. Device according to one of claims 2 to 17, characterized in that que lesdits moyens d'amplification et de guidage (4) vent implantes au moins  said amplification and guidance means (4) have at least one implant partiellement dans ledit substrat (2).  partially in said substrate (2). 19. Dispositif selon l'une des revendications 1 a 18, caracterise en ce  19. Device according to one of claims 1 to 18, characterized in that que lesdits elements optiques passifs de couplage (6,7,9,10,12-14) vent choisis dans un groupe comprenant au moins les micro-miroirs, les micro lentilles, les isolateurs, les multiplexeurs de longueur d'onde pompesignal, les filtres egaliseurs statiques ou variables, les attenuateurs statiques ou  said passive optical coupling elements (6,7,9,10,10,12-14) are selected from a group comprising at least micro-mirrors, micro-lenses, isolators, wavelength signaling multiplexers, static or variable equalizing filters, static attenuators or variables, et les filtres rejecteurs.  variables, and rejector filters. 20. Dispositif selon l'une des revendications 1 a 19, caracterise en ce  20. Device according to one of claims 1 to 19, characterized in that que ledit boftier (15) loge au moins un element auxiliaire de regulation eVou de  said housing (15) houses at least one auxiliary control element eVou de contrOle eVou de commande.Control eVou of control. 21. Dispositif selon la revendication 20, caracterise en ce que ledit element auxiliaire est choisi dans un groupe comprenant au moins les elements de couplage eVou de filtrage eVou de multiplexage de canaux eVou  21. Device according to claim 20, characterized in that said auxiliary element is chosen from a group comprising at least the eVou filtering elements eVou channel multiplexing eVou de demultiplexage de canaux eVou de commutation.  demultiplexing channels eVou switching. 22. Dispositif selon l'une des revendications 2 a 21, caracterise en ce  22. Device according to one of claims 2 to 21, characterized in that que l'un au moins des moyens et elements, choisis dans le groupe comprenant les moyens de pompage optique (3), les premiers elements 2 0 passifs de couplage (6,7,9,10) et les seconds elements passifs de couplage (12-14), est au moins partiellement implante dans un logement adapte forme  at least one of the means and elements selected from the group comprising the optical pumping means (3), the first passive coupling elements (6, 7, 9, 10) and the second passive coupling elements ( 12-14), is at least partially implanted in a suitable housing form dans ledit substrat (2) en un endroit choisi.  in said substrate (2) at a selected location. 23. Dispositif selon l'une des revendications 2 a 22, caracterise en ce  23. Device according to one of claims 2 to 22, characterized in that que ledit substrat (2) comporte une face superieure pourvue d'au moins une 2 5 portion en saillie formant detrompeur eVou destinee a recevoir ou caler une  said substrate (2) has a top face provided with at least one protruding portion forming a rectifier eVou for receiving or wedging a partie au moins de l'un au moins desdits moyens ou elements.  at least part of at least one of said means or elements. 24. Dispositif selon l'une des revendications 2 a 23, caracterise en ce  24. Device according to one of claims 2 to 23, characterized in that qu'une partie au moins audit substrat (1) est realisee dans un materiou choisi  at least a portion of said substrate (1) is made of a selected material dans un groupe comprenant la silice, l'AIN et le silicium.  in a group comprising silica, AlN and silicon. 25. Dispositif selon l'une des revendications 1 a 24, caracterise en ce  25. Device according to one of claims 1 to 24, characterized in that qu'il comprend un filtre egaliseur de gain realise sur au moins une face de l'un au moins des premiers elements optiques passifs (6,7,9,10), des seconds  it comprises a gain equalizer filter made on at least one face of at least one of the first passive optical elements (6, 7, 9, 10), second elements optiques passifs (12-14) et des elements auxiliaires.  passive optical elements (12-14) and auxiliary elements. 26. Dispositif selon l'une des revendications 1 a 25, caracterise en ce  26. Device according to one of claims 1 to 25, characterized in that qutil comprend un filtre egaliseur de gain realise sur l'une au moins des  it includes a gain equalizer filter performed on at least one of the facettes d'entree et de sortie des moyens d'amplification et de guidage (4).  input and output facets of the amplification and guiding means (4). 27. Dispositif selon l'une des revendications 1 a 26, caracterise en ce  27. Device according to one of claims 1 to 26, characterized in that qu'il comprend plusieurs moyens de pompage (3), plusieurs moyens d'amplitcation et de guidage (4), plusieurs premiers elements optiques passifs (6,7,9,10), plusieurs seconds elements optiques passifs (12-14) eVou plusieurs  it comprises a plurality of pumping means (3), a plurality of amplification and guiding means (4), a plurality of first passive optical elements (6, 7, 9, 10), a plurality of passive second optical elements (12-14). many elements auxiliaires loges dans ledit bo^'tier (15).  auxiliary elements housed in said housing (15). 28. Utilisation du dispositif selon l'une des revendications precedentes  28. Use of the device according to one of the preceding claims
FR0203231A 2002-03-15 2002-03-15 Ultra-compact optical amplifier used in telecommunications comprises housing containing an optical pump, a light amplification and guiding unit, passive optical coupling elements, and light guides Pending FR2837290A1 (en)

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