EP3980823A1 - Fibre optique - Google Patents

Fibre optique

Info

Publication number
EP3980823A1
EP3980823A1 EP20734649.5A EP20734649A EP3980823A1 EP 3980823 A1 EP3980823 A1 EP 3980823A1 EP 20734649 A EP20734649 A EP 20734649A EP 3980823 A1 EP3980823 A1 EP 3980823A1
Authority
EP
European Patent Office
Prior art keywords
optical waveguide
cores
light
optical
core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20734649.5A
Other languages
German (de)
English (en)
Inventor
César JÁUREGUI MISAS
Jens Limpert
Andreas TÜNNERMANN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Friedrich Schiller Universtaet Jena FSU
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Friedrich Schiller Universtaet Jena FSU
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV, Friedrich Schiller Universtaet Jena FSU filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP3980823A1 publication Critical patent/EP3980823A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
    • G02B6/021—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the core or cladding or coating, e.g. materials, radial refractive index profiles, cladding shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • H01S3/06737—Fibre having multiple non-coaxial cores, e.g. multiple active cores or separate cores for pump and gain
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29331—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by evanescent wave coupling
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • H01S3/06733—Fibre having more than one cladding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
    • H01S3/094007—Cladding pumping, i.e. pump light propagating in a clad surrounding the active core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes 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

Definitions

  • the invention relates to an optical waveguide with two or more parallel to one another along the longitudinal extension of the optical waveguide, spaced from one another, continuously from one light-guiding cores extending to the other end of the optical waveguide and with a first cladding surrounding the cores.
  • the invention also relates to a laser system with a laser light source and an optical amplifier coupled thereto.
  • the invention also relates to a method for guiding light in an optical waveguide.
  • Optical waveguides (often in the form of optical fibers made of quartz glass or plastic) are known in various configurations from the prior art.
  • Optical fibers are cables used to transmit light.
  • the known optical waveguides are dielectric waveguides which are constructed from concentric layers. In the center there is a light-guiding core which is enclosed by a cladding which has a lower refractive index than the core.
  • protective layers made of plastic that surround the jacket are also provided.
  • the core has a diameter of a few micrometers to over a millimeter.
  • optical waveguides among other things, according to the number of modes of the electromagnetic radiation of light that can propagate, which is limited by the core diameter (singlemode / multimode fibers).
  • the further development of fiber lasers in recent times has led to the fact that fiber optics as an active medium provide a reliable concept for high-power lasers.
  • the development from low-energy lasers to high-power lasers for industrial applications is based on the ability of optical fibers to handle high power.
  • the very good ratio of surface area to active volume allows heat to be dissipated efficiently. This is an excellent prerequisite for high-performance operation.
  • conditions in the fiber optic lead to various problems. For example, the restriction of the light signal to the core of the optical waveguide leads to high light intensity and interactions between the material of the optical waveguide and the light signal. In particular, this also creates non-linear effects that are difficult to control. This severely affects the signal quality.
  • Optical waveguides should therefore be designed in such a way that non-linear effects and interactions with the fiber material are reduced.
  • the easiest and most effective way to reduce nonlinear effects is to increase the diameter of the core. On the one hand, this reduces the intensity of the light in the core and, on the other hand, the absorption of pump light can be increased, for example in the case of double-clad optical waveguides. Due to the improved absorption of the pump light, the optical waveguide can be shortened and thus non-linear effects can be further reduced.
  • the partial beams are amplified, spectrally broadened or transported in several spatially separated, independent optical elements / channels and finally combined again in an output beam.
  • the same spectral components propagate in the different channels, only a division of the power takes place at the beam splitter.
  • the spectral combination on the other hand, there is also a spectral division of the input signal. Combinations of both methods are possible.
  • the independent channels can be formed by the different cores of a multi-core fiber, each carrying a partial beam, in which the cores are surrounded by a common jacket (into which the pump light can be coupled for optical amplification) are.
  • the threshold from which mode instability and non-linear effects occur, scales approximately with the number of cores.
  • the distribution of the radiation on the individual nuclei and the recombination of the radiation according to The multicore fiber is passed through outside the multicore fiber by means of suitable optical components (beam splitters).
  • phase adjustment elements assigned to the individual channels are usually provided in front of or behind the multicore fiber in the beam direction, which influence the phase of the radiation in the respective partial beam.
  • the different phase shifts occurring in the individual channels can be compensated for in order to enable the partial beams to be superimposed in the correct phase in the output beam.
  • a control loop is used in which the phases of the radiation in the partial beams are manipulated variables. Properties of the output beam (e.g. average power, peak pulse power) that are appropriately detected are controlled variables. In this way, phase shifts in the individual channels can be automatically compensated.
  • the object of the invention is to provide a multi-core optical waveguide for high-performance operation with a system that is less complex than the prior art.
  • the invention achieves this object on the basis of an optical waveguide of the type specified in that the cores are arranged and spaced from one another in such a way that the propagation modes of the couple to each other in the optical waveguide at a working wavelength propagating light, the length of the optical waveguide being selected so that the light coupled into a single one of the cores at one end of the optical waveguide initially propagates through the optical waveguide to the other cores and after passing through it of the optical waveguide at the other end leaves the optical waveguide in turn from a single core with at least 60%, preferably at least 75% of the total light power propagating in the optical waveguide.
  • the invention deviates from the cited prior art, in which cores of the multicore fibers that are carefully shielded from one another guide the partial beams.
  • the cores are arranged and spaced such that they interact with one another, i. are coupled.
  • the targeted coupling between the cores of the optical waveguide enables the light, which is initially only coupled into one of the cores, to propagate to the other cores. This corresponds to the beam splitting in conventional systems. Then the light returns to a single nucleus, e.g. back to the original nucleus into which the light was coupled. This corresponds to the recombination in conventional systems.
  • the light is coupled into one core and then spreads through the mutual coupling of the propagation modes over a certain propagation path into the other cores, in order to form a single core, e.g. to return to the original core.
  • the intensity pattern that the light generates over the cross-section of the optical waveguide while it propagates along it changes periodically and, as a function of the propagation distance, first detects one core, then several cores and then another core. This cycle can be repeated several times along the optical fiber.
  • the main feature of the invention is that the light is coupled into a single core at the input of the optical waveguide and the majority of the light power (at least 60%) leaves the optical waveguide again from a single core at the output.
  • the reason for the automatic recombination of light after a certain propagation distance in a nucleus, in particular the original nucleus, is the Talbot Effect.
  • This effect ensures that the periodic structure in which the cores running through the entire optical waveguide are arranged at the input end of the optical waveguide, with the resulting intensity distribution of the light in cross-sectional planes of the optical waveguide, which are at certain periodic intervals along the optical waveguide are located.
  • the periodicity of this mapping along the optical waveguide depends on the distances between the cores, ie on the period length of the structure on the input side, and on the refractive indices of the cores.
  • the length of the optical waveguide can be selected in accordance with the arrangement and spacing of the cores and the refractive index ratios in such a way that the light at the output of the optical waveguide is (almost) completely fed back into a single, preferably the same core into which the light is was originally coupled at the entrance of the fiber optic cable.
  • the division of the light radiation into partial beams takes place automatically through the coupling of the propagation modes, as does the recombination.
  • no separate components are therefore required for the beam splitting and beam combination.
  • a regulation with phasing to stabilize the recombination can also be omitted.
  • a laser system in which the optical waveguide according to the invention is used is therefore significantly less complex and less error-prone compared to the prior art.
  • the optical waveguide according to the invention when used, the entire light power is distributed over several cores, so that non-linear effects are avoided and, due to the distribution of the thermal load over several cores, the power threshold from which the mode instability occurs is raised.
  • the optical waveguide according to the invention behaves like a single-core optical waveguide with a larger core diameter and can be handled accordingly in the application. With five cores, for example, an effective core diameter can be achieved that is two to three times as large as the core diameter of a corresponding single-core optical waveguide.
  • the periodicity of the Talbot effect depends on the wavelength of the light.
  • the length of the optical waveguide and the arrangement of the cores and their refractive index profiles must be designed for a specific working wavelength.
  • the working wavelength does not mean a single wavelength value, but rather a mean wavelength value.
  • the principle of the optical waveguide according to the invention works around this value with a spectral bandwidth which is sufficient for most applications. The requirement that more than 60% or even more than 75% of the power leave the fiber optic cable from the one core is met for a wide range of wavelengths.
  • the optical waveguide in the case of the optical waveguide according to the invention, it expediently has a lower refractive index in the area forming the first cladding than in the areas forming the cores.
  • the differences in the refractive index ensure that the light is guided in the various core areas.
  • the cores have (slightly) different refractive indices from one another.
  • An embodiment is particularly advantageous in which a central core responsible for coupling the light in and out has a different refractive index than the other cores surrounding this central core into which the light propagates as a result of the coupling.
  • the optical waveguide according to the invention can be designed as a step index fiber.
  • Another implementation e.g. however, it is also conceivable as a photonic crystal fiber.
  • the refractive index ie the refractive index profile, seen in the cross section of the optical waveguide
  • the refractive index of one core into which the light is coupled into the optical waveguide can initially (continuously) be increased (or decreased) with increasing propagation distance, while the refractive index in the other cores remains constant. In this way it can be achieved that after the spread of the in the one Core coupled light to the other cores over long propagation distances the mutual coupling of the cores is canceled, so that in the course of the optical waveguide the light cannot get back into one core. Only at the end of the waveguide does one core again reach its original refractive index value, so that the light couples back into this core and finally leaves the optical waveguide again from this core.
  • the optical waveguide in a preferred embodiment can have a second jacket which, viewed in the cross section of the optical waveguide, encloses the first jacket, wherein the optical waveguide has a lower refractive index in the region forming the second cladding than in the region of the first cladding.
  • a pump light source can be optically coupled to the first cladding, which is shared by all the cores of the optical waveguide. The pump light is then guided in the first jacket.
  • the optical gain in the optical waveguide can e.g. by non-linear effects (e.g.
  • the radiation emitted by a laser light source is coupled into one core at one end of the optical waveguide according to the invention, runs through the optically pumped optical waveguide, the intensity distribution, as described above, being distributed periodically alternately to the other cores, so that all cores on the guide and Amplification of the laser radiation are involved, so the laser radiation, in other words, is distributed to all nuclei during the amplification process.
  • the amplified radiation is again coupled out from the one core using the Talbot effect with at least 60% of the total power generated in the optical waveguide.
  • At least one of the cores of the optical waveguide is doped with rare earth ions.
  • all cores are doped.
  • an embodiment is particularly preferred in which at least one of the cores is not doped with rare earth ions, i.e. is passive. All but the one core into which the light is coupled and from which the light leaves the optical waveguide are preferably doped with rare earth ions. The amplification therefore only takes place in the other nuclei in which the light propagates after being coupled into the one nucleus.
  • the passive core which, for example, is arranged centrally when viewed in the cross section of the optical waveguide and is surrounded by the other (active) cores, only serves to couple the light in and out and does not take part in the amplification.
  • the optical waveguide according to the invention is not only suitable as an optical amplifier, but also, without optical pumping, as a simple transport fiber or as a spectral broadening fiber in which nonlinear effects (e.g. self-phase modulation) are permitted and even desired in the cores to a certain extent.
  • a centrally arranged central core, seen in the cross section of the optical waveguide is provided, which is expediently used for coupling light in and out.
  • the central core is surrounded by at least four further cores in a cross-shaped arrangement. This results in a periodic arrangement of the cores in cross-section, which is advantageous for exploiting the Talbot effect.
  • An alternative periodic arrangement results when the central core is surrounded by the further cores in one or more concentric, circular arrangements.
  • the cores have the same or different diameters and / or refractive index profiles.
  • a configuration with a circular cross section is expedient for the production of the optical waveguide, for example as an optical fiber.
  • the optical fiber can be designed like a conventional multicore fiber.
  • the invention also relates to a method for guiding light in an optical waveguide which has two or more light-guiding cores running parallel to one another, spaced apart from one another along the longitudinal extension of the optical waveguide, and a first cladding surrounding the cores.
  • the light is coupled into only one of the cores at one end of the optical waveguide, the cores being arranged and spaced from one another in such a way that the propagation modes of the light propagating in the optical waveguide at a working wavelength couple to one another and the light is extracted the one core spreads into the other cores, the length of the optical waveguide being chosen so that the light using the Talbot effect after passing through the optical waveguide at the other end of the optical waveguide again consists of only one core with at least 60%, preferably at least 75% the total light power propagating in the optical waveguide leaves.
  • Figure 1 a) Cross section of an inventive
  • FIG. 2 cross-sectional views of various embodiments of the optical waveguide with different arrangements of the cores
  • FIG. 3 a schematic representation of a MOPA laser system with the optical waveguide according to the invention as an optical amplifier.
  • Figure 1 a shows an optical waveguide according to the invention in a cross-sectional illustration.
  • the optical waveguide has five parallel to one another, spaced apart from one another, in each case continuously from one end to the other, along the longitudinal extension of the optical waveguide (ie perpendicular to the plane of the drawing) of the optical waveguide running light-guiding cores 1 a, 1 b, 1 c, 1 d, 1 e, and a first cladding 2 that jointly encloses the cores 1 a-1 e.
  • the cores 1 b-1 e are around the central core 1 a arranged around in a cross shape.
  • the optical waveguide has a lower refractive index in the area forming the first cladding 2 than in the areas forming the cores 1a-1e.
  • a second jacket 3 is also provided, which surrounds the first jacket 2 serving as a pump jacket, the optical waveguide in the area 3 forming the second jacket having a lower refractive index than in the area of the first jacket 2.
  • the matrix material of the optical waveguide designed as an optical fiber can be, for example Be quartz glass.
  • light at a working wavelength is only coupled into one of the identically designed cores 1 a-1 e, specifically into the central core 1a.
  • the propagation modes of the light initially coupled into the core 1 a couple between the central core 1a and the surrounding cores 1 b-1e. or several times back and forth so that the light in the optical waveguide is guided over long distances in separate channels 1 a-1 e as partial beams.
  • the desired recombination of the partial beams in turn in the one core 1 a at the end of the optical waveguide is achieved by choosing the appropriate length of the optical waveguide. Because of the Talbot effect, this condition is met after periodic propagation intervals.
  • FIG. 1b This periodic behavior is illustrated in FIG. 1b.
  • the five diagrams are overwritten with the reference numerals 1 a-1 e of the five cores of the arrangement of FIG. 1 a and show the light power P of the light propagating in the respective core 1 a-1 e as a function of the propagation distance D.
  • the functions Optical fiber as an optical amplifier, so that the maximum power increases over the propagation distance D.
  • the power P begins only in the core 1 a with a value other than zero, into which the light (in the diagrams from the left) is coupled.
  • the intensity P then oscillates in the five cores 1 a-1 e as a function of the propagation distance, specifically in the cores 1 b-1 e with a phase opposite to the core 1a, from which it can be seen that the light between the channels 1 a -1 e during the propagation back and forth here changes, ie is divided and recombined several times.
  • the length of the optical waveguide is chosen so that the light output P in the core 1 a at the output of the optical waveguide (in the diagrams on the right) is maximum and in the other cores 1 b-1 e it is minimal. Accordingly, most of the power (more than 75%) of the light leaves the optical waveguide from the central core 1 a.
  • FIG. 2 shows various possible arrangements of the cores in the optical waveguide according to the invention.
  • the number of cores 1 is greater than in Figure 1.
  • the cross shape is retained.
  • the cores 1 have different diameters.
  • the cross shape according to FIG. 2a is again selected, the cores 1 having different diameters in a symmetrical arrangement.
  • the central core 1a is ring-shaped surrounded by further cores, in Figure 2e in two concentric rings with different radii.
  • the optical waveguide is shown schematically in a sectional side view, which is integrated into a laser system.
  • the radiation from a laser light source 4 (for example a conventional pulsed fiber laser) is coupled into the central core 1a.
  • the sheath 2 of the optical waveguide is coupled to a pump light source 5 (for example a conventional diode laser).
  • the cores 1 a-1 e are doped with rare earth ions. Core-pumped operation, in which the pump light is coupled into at least some of the cores (1a-1e), is also conceivable.
  • the power is distributed in the drawing from the left between the central core 1 a and the other cores 1 b-1 e, as indicated in FIG. 3 by the different shading along the longitudinal extension of the light waveguide.
  • the length L of the optical waveguide is chosen so that the light output from the center of the optical waveguide to the exit end on the right, using the Talbot effect, couples back into the central core 1a, where the amplified light leaves the optical waveguide.
  • the entire light output is distributed over the cores 1 a-1 e, so that non-linear effects are avoided and, due to the distribution of the thermal load on all cores 1a-1 e, mode instability is avoided.
  • the optical waveguide according to the invention can be like a single-core optical waveguide with a larger Core diameter can be used. Complex optical arrangements for beam splitting and combination as well as control arrangements for stabilizing the phases of the partial beams are not required.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

L'invention concerne une fibre optique comprenant deux ou plusieurs cœurs (1a-1e) conducteurs de lumière s'étendant parallèles les uns par rapport aux autres le long de l'extension longitudinale de la fibre optique, distant les uns des autres, continus d'une extrémité à l'autre extrémité de la fibre optique et comprenant une première enveloppe (2) entourant les cœurs (1a-1e). L'objet de l'invention est de fournir une fibre optique à plusieurs cœurs pour l'exploitation haute performance avec une complexité de système réduite par rapport à celle de l'état de la technique. L'objet est atteint par l'invention en disposant les cœurs (1a-1e) les uns par rapport aux autres et en les espaçant les uns des autres de telle façon que les modes de propagation de la lumière se propageant à une longueur d'onde de travail dans la fibre optique s'accouplent les uns aux autres, la longueur de la fibre optique étant choisie de telle façon que la lumière s'accouplant dans un seul des cœurs (1a-1e) à une extrémité de la fibre optique s'étend d'abord, durant la propagation à travers la fibre optique, aux autres cœurs (1a-1e) et, après la traversée de la fibre optique, à l'autre extrémité de la fibre optique, au moins 60%, de préférence au moins 75%, de la puissance lumineuse totale se propageant à travers la fibre optique sort de nouveau d'un seul cœur (1a). L'invention concerne en plus un système laser comprenant une telle fibre optique comme amplificateur optique, ainsi qu'un procédé de guidage de lumière dans une fibre optique.
EP20734649.5A 2019-06-04 2020-06-04 Fibre optique Pending EP3980823A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019114974.6A DE102019114974A1 (de) 2019-06-04 2019-06-04 Lichtwellenleiter
PCT/EP2020/065422 WO2020245244A1 (fr) 2019-06-04 2020-06-04 Fibre optique

Publications (1)

Publication Number Publication Date
EP3980823A1 true EP3980823A1 (fr) 2022-04-13

Family

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WO2023157178A1 (fr) * 2022-02-17 2023-08-24 日本電信電話株式会社 Fibre optique d'amplification, amplificateur optique et procédé de commande d'amplificateur optique

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JPS62127807A (ja) * 1985-11-29 1987-06-10 Furukawa Electric Co Ltd:The 光合流分岐器
JPH0740617B2 (ja) * 1986-08-08 1995-05-01 日本電信電話株式会社 光フアイバレ−ザ
IT1237970B (it) * 1990-02-07 1993-06-19 Pirelli Cavi Spa Amplificatore ottico a fibra attiva,con porzioni a doppio nucleo,a larga banda di lunghezza d'onda di segnale
GB9803275D0 (en) * 1998-02-16 1998-04-08 Univ Southampton Optical fibre filters
AUPP218198A0 (en) * 1998-03-04 1998-03-26 University Of Sydney, The Ultra-broadband low-noise gain-flattened rare-earth-doped fibre amplifier
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CN100495093C (zh) * 2007-09-14 2009-06-03 中国科学院上海光学精密机械研究所 强耦合的多芯光纤
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US8903211B2 (en) * 2011-03-16 2014-12-02 Ofs Fitel, Llc Pump-combining systems and techniques for multicore fiber transmissions
DE102014001252A1 (de) 2014-02-03 2015-08-20 Friedrich-Schiller-Universität Jena Optische Anordnung mit Strahlaufteilung
JP6799835B2 (ja) * 2015-08-27 2020-12-16 バー‐イラン、ユニバーシティーＢａｒ−Ｉｌａｎ Ｕｎｉｖｅｒｓｉｔｙ マルチ光結合チャネルモジュールおよび関連する計算方法

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CN114072710A (zh) 2022-02-18
US20220326431A1 (en) 2022-10-13
CN114072710B (zh) 2024-05-31
WO2020245244A1 (fr) 2020-12-10

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