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WO2025197905A1 - Amplificateur à fibre optique - Google Patents

Amplificateur à fibre optique

Info

Publication number
WO2025197905A1
WO2025197905A1 PCT/JP2025/010440 JP2025010440W WO2025197905A1 WO 2025197905 A1 WO2025197905 A1 WO 2025197905A1 JP 2025010440 W JP2025010440 W JP 2025010440W WO 2025197905 A1 WO2025197905 A1 WO 2025197905A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
fiber amplifier
pumping light
light source
double
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
PCT/JP2025/010440
Other languages
English (en)
Japanese (ja)
Inventor
敦史 大島
節文 大塚
英久 田澤
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of WO2025197905A1 publication Critical patent/WO2025197905A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • 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
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating

Definitions

  • Non-Patent Documents 1 to 3 each describe a cladding-pumped multi-core optical fiber amplifier in which the outer cladding is formed from a resin material and a multimode laser is used as the pumping light.
  • Patent Documents 1 and 2 each disclose a rare-earth-doped multi-core optical fiber amplifier in which rare earth elements are doped in a ring-shaped configuration in a rare-earth-doped optical fiber.
  • the present disclosure relates to an optical fiber amplifier comprising: a double-clad optical fiber formed of silica glass, the double-clad optical fiber comprising a plurality of cores doped with a rare earth element, an inner cladding including the plurality of cores, and an outer cladding including the inner cladding; and a pumping light source that outputs transverse single-mode pumping light to the double-clad optical fiber, wherein the total area of the plurality of cores is 10% or more of the area of the inner cladding.
  • FIG. 1 is a diagram showing an outline of an optical fiber amplifier according to the first embodiment.
  • FIG. 2 is a cross-sectional view showing an outline of a double-clad optical fiber in the optical fiber amplifier according to the first embodiment.
  • FIG. 3 is a diagram showing the relationship between the core-clad area ratio and the pumping efficiency in a double-clad optical fiber.
  • FIG. 4 is a diagram showing an outline of an optical fiber amplifier according to the second embodiment.
  • FIG. 5 is a cross-sectional view showing an outline of a double-clad optical fiber in an optical fiber amplifier according to the second embodiment.
  • FIG. 6 is a diagram showing an outline of an optical fiber amplifier according to the third embodiment.
  • FIG. 7 is a diagram showing an outline of an optical fiber amplifier according to the fourth embodiment.
  • FIG. 8 is a diagram showing an outline of an optical fiber amplifier according to the fifth embodiment.
  • This disclosure provides an optical fiber amplifier with improved pumping efficiency.
  • the optical fiber amplifier of the present disclosure comprises a double-clad optical fiber formed of silica glass, which includes multiple cores doped with a rare earth element, an inner cladding including the multiple cores, and an outer cladding including the inner cladding.
  • the optical fiber amplifier of the present disclosure also includes a pumping light source that outputs transverse single-mode pumping light to the double-clad optical fiber.
  • the total area of the multiple cores in the optical fiber amplifier of the present disclosure is 10% or more of the area of the inner cladding.
  • the optical fiber amplifier disclosed herein can achieve high pumping efficiency.
  • the diameter of the inner cladding may be 30 ⁇ m or more and 80 ⁇ m or less. This is because this can improve the pumping efficiency when the optical fiber amplifier amplifies the signal light.
  • the number of cores may be 3 or more and 8 or less. This is because the pumping efficiency can be improved when the optical fiber amplifier amplifies the signal light.
  • the inter-core distance between the multiple cores may be 25 ⁇ m or less. This is because when the optical fiber amplifier amplifies the signal light, it can also accommodate coupled transmission. Also, when the optical fiber amplifier amplifies the signal light, the cores can be densely arranged inside the cladding, which improves pumping efficiency.
  • the number of cores may be four, and the diameter of the inner cladding may be 50 ⁇ m or less. This is because the diameter of the inner cladding can be reduced when the optical fiber amplifier amplifies the signal light.
  • the diameter of the outer cladding may be 125 ⁇ m. This is because this is a standard outer diameter when connecting the optical fiber amplifier to the outside, improving connectivity.
  • the relative refractive index difference between the inner cladding and the outer cladding may be 0.5% or more and 2% or less. This is because, when the optical fiber amplifier amplifies signal light, the double-clad optical fiber can increase the acceptance angle of light received from the pump light source.
  • two pumping light sources a first pumping light source and a second pumping light source
  • the first pumping light output from the first pumping light source and the second pumping light output from the second pumping light source may be combined by a polarization combiner, and the combined pumping light may be input to the double-clad optical fiber. This is because the intensity of the pumping light can be increased when the optical fiber amplifier amplifies the signal light.
  • two pumping light sources a first pumping light source and a second pumping light source
  • the first pumping light output from the first pumping light source and the second pumping light output from the second pumping light source may be multiplexed by an optical multiplexer, and the resulting pumping light may be input to the double-clad optical fiber. This is because the intensity of the pumping light can be increased when the optical fiber amplifier amplifies the signal light.
  • two pumping light sources a first pumping light source and a second pumping light source
  • the first pumping light source may be connected to the front of the double-clad optical fiber
  • the second pumping light source may be connected to the rear of the double-clad optical fiber.
  • the optical fiber amplifier includes a double-clad multi-core optical fiber formed of silica glass, the double-clad multi-core optical fiber including a plurality of cores doped with a rare-earth element, an inner cladding including the plurality of cores, and an outer cladding including the inner cladding.
  • the optical fiber amplifier includes a pumping light source that outputs transverse single-mode pumping light to the double-clad optical fiber.
  • the total area of the plurality of cores in a cross section perpendicular to its longitudinal direction is 10% or more of the area of the inner cladding in the same cross section.
  • the number of cores in the double-clad optical fiber in the optical fiber amplifier is four. Signal light is transmitted through at least one of the four cores.
  • FIG. 1 is a diagram showing an outline of an optical fiber amplifier 1, which is an example of an optical fiber amplifier according to the first embodiment.
  • an erbium-doped optical fiber (EDF) doped with erbium (Er) is used as the double-clad optical fiber.
  • the optical fiber amplifier 1 amplifies the signal light Ls and outputs it as signal light La.
  • the optical fiber amplifier 1 includes a pumping light source 10, an optical multiplexer 20, an optical isolator 30, and an EDF 50.
  • the EDF 50 is provided between the optical multiplexer 20 and the optical isolator 30.
  • the signal light Ls amplified by the optical fiber amplifier 1 is input to the optical multiplexer 20.
  • the pumping light source 10 is connected to the optical multiplexer 20.
  • the pumping light Le output from the pumping light source 10 is multiplexed with the signal light Ls in the optical multiplexer 20.
  • the optical multiplexer 20 outputs multiplexed light Lc, which is obtained by multiplexing the signal light Ls and the pumping light Le, to the EDF 50.
  • the EDF 50 amplifies the signal light Ls contained in the input multiplexed light Lc and outputs it to the optical isolator 30.
  • the multiplexed light Lc that has passed through the optical isolator 30 is output as signal light La.
  • the pumping light source 10 outputs transverse single-mode light with a wavelength of, for example, 980 nm.
  • the pumping light source 10 is connected to the optical multiplexer 20 by an optical fiber, for example a single-core optical fiber with a core diameter of 5.3 ⁇ m and a cladding diameter of 125 ⁇ m.
  • the numerical aperture (NA) of the optical fiber connecting the pumping light source 10 to the optical multiplexer 20 is, for example, 0.14.
  • the double-clad optical fiber in the optical fiber amplifier according to the first embodiment will be described.
  • the double-clad optical fiber comprises multiple cores doped with a rare earth element, an inner cladding containing the multiple cores, and an outer cladding containing the inner cladding.
  • the double-clad optical fiber is made of silica glass.
  • the cores, inner cladding, and outer cladding are each made of silica glass.
  • Figure 2 is a diagram showing the general structure of the EDF 50 in the optical fiber amplifier 1, and is a cross-sectional view taken along a plane perpendicular to the longitudinal direction of the EDF 50.
  • EDF 50 has multiple cores 51 and cladding 52.
  • Cladding 52 has an inner cladding 52a and an outer cladding 52b.
  • EDF 50 is composed of a waveguide structure for signal light Ls formed by the cores 51 and inner cladding 52a, and a waveguide structure for pump light Le formed by the inner cladding 52a and outer cladding 52b.
  • EDF 50 has each of its multiple cores 51 doped with erbium.
  • the core 51 is formed from silica glass co-doped with germanium and aluminum. By doping the silica glass with germanium and aluminum, the core 51 has a higher refractive index than pure silica glass, with a relative refractive index difference of 0.9% higher.
  • the diameter of the core 51 is, for example, 8.9 ⁇ m.
  • the core 51 is doped with erbium at an atomic concentration of approximately 5 ⁇ 10 24 m ⁇ 3 .
  • the mode field diameter of light in the core 51 at a wavelength near 1550 nm is, for example, 10 ⁇ m.
  • the centers of the multiple cores 51 are located at the vertices of a square lattice spaced at 20 ⁇ m intervals in a cross section perpendicular to the longitudinal direction of the EDF 50. In other words, the distance between the centers of the multiple cores 51 may be 20 ⁇ m.
  • the inter-core distance between the multiple cores 51 is not limited to the above example, and may be, for example, 25 ⁇ m or less. If the inter-core distance is 25 ⁇ m or less, the optical fiber amplifier 1 can also support coupled transmission when amplifying signal light. When the optical fiber amplifier 1 amplifies signal light, the cores can be densely arranged inside the cladding, improving excitation efficiency.
  • the inner cladding 52a is made of silica glass doped with aluminum.
  • the addition of aluminum to the silica glass gives the inner cladding 52a a higher refractive index than pure silica glass, with a relative refractive index difference of 0.5% higher.
  • the diameter of the inner cladding 52a is, for example, 50 ⁇ m.
  • the diameter of the inner cladding 52a is not limited to the above example and may be, for example, 30 ⁇ m or more and 80 ⁇ m or less.
  • the diameter of the inner cladding 52a is not limited to the above example and may be, for example, 30 ⁇ m or more and 50 ⁇ m or less.
  • the outer cladding 52b is formed from fluorine-doped silica glass.
  • the doping of fluorine into the silica glass gives the outer cladding 52b a lower refractive index than pure silica glass, with a relative refractive index difference that is 0.7% lower.
  • the diameter of the outer cladding 52b is, for example, 125 ⁇ m. Since the standard outer diameter of the outer cladding in a typical optical fiber is 125 ⁇ m, it is preferable that the diameter (outer diameter) of the outer cladding 52b be 125 ⁇ m. Making the diameter (outer diameter) of the outer cladding 52b 125 ⁇ m improves connectivity with other elements.
  • the diameter of the outer cladding is said to be 125 ⁇ m, it does not necessarily mean that the diameter of the outer cladding is strictly 125 ⁇ m. For example, if the outer diameter of the outer cladding is within the manufacturing tolerance range of 125 ⁇ m, this is included in the case where the diameter of the outer cladding is 125 ⁇ m.
  • the refractive index difference between the inner cladding 52a and the outer cladding 52b is, for example, 0.8% in terms of relative refractive index difference.
  • the numerical aperture (NA) of the waveguide structure formed by the inner cladding 52a and the outer cladding 52b is, for example, 0.19, calculated assuming the refractive index of pure silica is 1.5.
  • the refractive index difference between the inner cladding 52a and the outer cladding 52b is not limited to the above example, and may be, for example, a relative refractive index difference of 0.5% to 2%.
  • a relative refractive index difference 0.5% to 2%.
  • Figure 3 is a diagram showing the relationship between the core-cladding area ratio and pumping efficiency in a double-clad optical fiber.
  • Figure 3 shows the pumping efficiency in a double-clad optical fiber as a result of changing the intensity of the pumping light.
  • the horizontal axis in Figure 3 shows the core-clad area ratio, which is the area ratio between the core and the clad.
  • the area ratio RS which is the ratio between the total area S1, which is the sum of the cross-sectional areas of the multiple cores 51, and the area S2, which is the cross-sectional area of the inner clad 52a, is the core-clad area ratio.
  • the area ratio RS indicates the proportion of the total area S1 of the multiple cores 51 to the area of the inner clad 52a.
  • the area ratio RS which is the core-clad area ratio, is calculated based on Equation 1.
  • the vertical axis in Figure 3 represents pumping efficiency.
  • Lines L1, L2, L3, and L4 in Figure 3 represent the results when the pumping light intensity per core is 18, 23, 26, and 29 dBm/core, respectively.
  • the laser output can be, for example, 1000 mW.
  • the EDF 50 has four cores, for example, when 1000 mW of pump light Le is output from the pump light source 10, the light intensity per core will be 250 mW.
  • a realistic pump light intensity is considered to be line L2 in Figure 3 (23 dBm/core ⁇ 200 mW/core).
  • the pump efficiency is 5, 10, and 20% when the core-clad area ratio is 0.01, 0.025, and 0.083, respectively.
  • the pump efficiency can be increased to 20% or more by setting the core-clad area ratio to 0.083, i.e., 8.3% or higher.
  • the core-clad area ratio may be 8.5% or more, preferably 10% or more, and even better 15% or more, with the upper limit being 100% or less.
  • the total area of the multiple cores in a cross section perpendicular to the longitudinal direction of the double-clad optical fiber may be 8.5% or more of the area of the inner cladding, preferably 10% or more, and even better 15% or more, with the upper limit being 100% or less.
  • the core-cladding area ratio will be 12.6% or more and 100% or less. Therefore, for example, when 1000 mW pumping light from the pumping light source 10 is amplified in the EDF 50, the pumping efficiency can be 20% or more.
  • the ratio of the core area to the inner cladding area can be increased by making the total area of the multiple cores 10% or more of the area of the inner cladding, thereby improving pumping efficiency.
  • the double-clad optical fiber is formed from silica glass, which allows the diameter of the inner cladding to be reduced. By reducing the diameter of the inner cladding, the ratio of the core area to the inner cladding area can be increased, improving pumping efficiency.
  • a multimode laser with a core diameter of 105 ⁇ m is generally used.
  • the inner cladding is made smaller, a difference in the core diameter between the inner cladding and the pumping light source occurs, degrading coupling efficiency and resulting in low pumping efficiency.
  • optical fiber amplifier by reducing the diameter of the inner cladding and amplifying with transverse single-mode pump light, coupling efficiency can be increased compared to when using pump light from a multimode laser, thereby improving pumping efficiency.
  • the optical fiber amplifier according to the second embodiment differs from the optical fiber amplifier according to the first embodiment in the number of cores in the double-clad optical fiber.
  • the number of cores in the double-clad optical fiber in the optical fiber amplifier is seven. Signal light is transmitted through at least one of the seven cores.
  • FIG. 4 is a diagram showing an outline of an optical fiber amplifier 2, which is an example of an optical fiber amplifier according to the second embodiment.
  • the optical fiber amplifier 2 amplifies the signal light Ls and outputs it as signal light La.
  • the optical fiber amplifier 2 comprises an excitation light source 110, an optical multiplexer 120, an optical isolator 130, and an EDF 150.
  • the EDF 150 is provided between the optical multiplexer 120 and the optical isolator 130.
  • the excitation light source 110, the optical multiplexer 120, and the optical isolator 130 have the same functions and configurations as the excitation light source 10, the optical multiplexer 20, and the optical isolator 30 in the optical fiber amplifier 1, respectively. Therefore, the description of the optical fiber amplifier 1 should be referred to and detailed description thereof will be omitted.
  • Figure 5 is a diagram showing the general structure of the EDF 150 in the optical fiber amplifier 2, and is a cross-sectional view taken along a plane perpendicular to the longitudinal direction of the EDF 150.
  • EDF 150 has multiple cores 151 and cladding 152.
  • Cladding 152 has inner cladding 152a and outer cladding 152b.
  • EDF 150 is composed of a waveguide structure for signal light Ls formed by cores 151 and inner cladding 152a, and a waveguide structure for pump light Le formed by inner cladding 152a and outer cladding 152b.
  • each of the multiple cores 151 is doped with erbium.
  • the core 151 is formed from silica glass co-doped with germanium and aluminum. By co-doping the silica glass with germanium and aluminum, the core 151 has a higher refractive index than pure silica glass, with a relative refractive index difference that is 0.9% higher.
  • the diameter of the core 151 is, for example, 8.9 ⁇ m.
  • the core 151 is doped with erbium at an atomic concentration of approximately 5 ⁇ 10 24 m ⁇ 3 .
  • the mode field diameter of light in the core 151 at a wavelength near 1550 nm is, for example, 10 ⁇ m.
  • Each of the multiple cores 151 is arranged in a hexagonal close-packed lattice with a spacing of 20 ⁇ m.
  • the inter-core distance between the multiple cores 151 is not limited to the above example, and may be, for example, 25 ⁇ m or less.
  • the inner cladding 152a is made of silica glass doped with aluminum.
  • the addition of aluminum to the silica glass gives the inner cladding 152a a higher refractive index than pure silica glass, with a relative refractive index difference that is 0.5% higher.
  • the diameter of the inner cladding 152a is, for example, 80 ⁇ m.
  • the diameter of the inner cladding 152a is not limited to the above example and may be, for example, 30 ⁇ m or more and 80 ⁇ m or less.
  • the diameter of the inner cladding 152a is not limited to the above example and may be, for example, 30 ⁇ m or more and 50 ⁇ m or less.
  • the outer cladding 152b is made of fluorine-doped silica glass.
  • the doping of fluorine into the silica glass gives the outer cladding 152b a lower refractive index than pure silica glass, with a relative refractive index difference that is 0.7% lower.
  • the diameter of the outer cladding 152b is, for example, 125 ⁇ m.
  • the relative refractive index difference between the inner cladding 152a and the outer cladding 152b is, for example, 0.8%.
  • the numerical aperture (NA) of the waveguide structure formed by the inner cladding 152a and the outer cladding 152b is, for example, 0.14, calculated assuming a wavelength of 980 nm emitted from the excitation light source 110 and a refractive index of pure silica of 1.5.
  • the refractive index difference between the inner cladding 152a and the outer cladding 152b is not limited to the above example, and may be, for example, a relative refractive index difference of 0.5% or more and 2% or less.
  • the diameter of the inner cladding can be reduced, increasing the ratio of the core area to the inner cladding area, thereby improving the pumping efficiency.
  • the number of cores in the double-clad optical fiber is not limited to the above examples.
  • the number of cores in the double-clad optical fiber may be, for example, 3 or more and 8 or less.
  • optical fiber amplifier according to a third embodiment differs from the optical fiber amplifier according to the first embodiment in the portion relating to the pumping light source.
  • FIG. 6 is a diagram showing an outline of an optical fiber amplifier 3, which is an example of an optical fiber amplifier according to the third embodiment.
  • the optical fiber amplifier 3 amplifies the signal light Ls and outputs it as signal light La.
  • the optical fiber amplifier 3 comprises pumping light sources 210a and 210b, a polarization beam combiner 240, an optical combiner 20, an optical isolator 30, and an EDF 50.
  • the EDF 50 is provided between the optical combiner 20 and the optical isolator 30.
  • the optical fiber amplifier 3 instead of the pumping light source 10 in the optical fiber amplifier 1, the optical fiber amplifier 3 comprises pumping light sources 210a and 210b, and a polarization beam combiner 240.
  • the description of the optical fiber amplifier 1 should be referred to, and detailed description thereof will be omitted here.
  • Each of pumping light sources 210a and 210b outputs transverse single mode light with a wavelength of, for example, 980 nm.
  • Pumping light Lea output from pumping light source 210a and pumping light Leb output from pumping light source 210b are polarization-combined in polarization combiner 240.
  • Pumping light Le which is obtained by polarization-combining pumping light Lea and pumping light Leb by polarization combiner 240, is output from polarization combiner 240 to optical multiplexer 20.
  • the optical fiber amplifier 3 is equipped with two pump light sources, but the number of pump light sources is not limited to two.
  • the optical fiber amplifier according to the third embodiment may be equipped with three or more pump light sources. In other words, the optical fiber amplifier according to the third embodiment may be equipped with multiple pump light sources.
  • the diameter of the inner cladding can be reduced and the ratio of the core area to the inner cladding area can be increased, thereby improving the pumping efficiency. Furthermore, in the optical fiber amplifier of the third embodiment, the intensity of the pumping light can be further increased by increasing the number of pumping light sources.
  • the optical fiber amplifier 3 was equipped with EDF50 as a double-clad optical fiber, but the optical fiber amplifier 3 may also be equipped with EDF150 instead of EDF50.
  • optical fiber amplifier according to a fourth embodiment differs from the optical fiber amplifier according to the first embodiment in the portion related to the pumping light source.
  • FIG. 7 is a diagram showing an outline of an optical fiber amplifier 4, which is an example of an optical fiber amplifier according to the fourth embodiment.
  • the optical fiber amplifier 4 amplifies the signal light Ls and outputs it as signal light La.
  • the optical fiber amplifier 4 comprises pumping light sources 310a and 310b, optical multiplexers 320 and 321, an optical isolator 30, and an EDF 50.
  • the EDF 50 is provided between the optical multiplexers 320 and 321.
  • the optical fiber amplifier 4 comprises pumping light source 310a and optical multiplexer 320 instead of the pumping light source 10 and optical multiplexer 20 in the optical fiber amplifier 1, and further comprises pumping light source 310b and optical multiplexer 321.
  • the components of the optical fiber amplifier 4 that are common to the optical fiber amplifier 1 please refer to the description of the optical fiber amplifier 1 and detailed description thereof will be omitted here.
  • the pumping light source 310a and the optical multiplexer 320 have the same functions and configurations as the pumping light source 10 and the optical multiplexer 20, respectively, please refer to the description of the optical fiber amplifier 1 and detailed description thereof will be omitted.
  • the pumping light source 310b outputs, for example, transverse single-mode light with a wavelength of 980 nm.
  • the pumping light Leb output from the pumping light source 310b is combined with the combined light Lc in the optical combiner 321.
  • the pumping light source is connected to the EDF 50 from the front and rear.
  • the pumping light source 310a is connected to the EDF 50 from the front by an optical multiplexer 320.
  • the pumping light Lea output from the pumping light source 310a propagates through the EDF 50 in the same direction as the signal light Ls.
  • the pumping light source 310b is connected to the EDF 50 from the rear by an optical multiplexer 321.
  • the pumping light Leb output from the pumping light source 310b propagates through the EDF 50 in the opposite direction to the signal light Ls.
  • the diameter of the inner cladding can be reduced and the ratio of the core area to the inner cladding area can be increased, thereby improving pumping efficiency. Furthermore, in the optical fiber amplifier of the fourth embodiment, the double-clad optical fiber can be pumped from the front and back, promoting the amplification of signal light in the double-clad optical fiber.
  • the optical fiber amplifier 4 was equipped with EDF 50 as a double-clad optical fiber, but the optical fiber amplifier 4 may also be equipped with EDF 150 instead of EDF 50.
  • the optical fiber amplifier according to the fifth embodiment differs from the optical fiber amplifier according to the first embodiment in the portion relating to the pumping light source.
  • FIG. 8 is a diagram showing an outline of an optical fiber amplifier 5, which is an example of an optical fiber amplifier according to the fifth embodiment.
  • the optical fiber amplifier 5 amplifies the signal light Ls and outputs it as the signal light La.
  • the optical fiber amplifier 5 comprises pumping light sources 410a and 410b, a wavelength combiner 440, an optical combiner 20, an optical isolator 30, and an EDF 50.
  • the EDF 50 is provided between the optical combiner 20 and the optical isolator 30.
  • the optical fiber amplifier 5 instead of the pumping light source 10 in the optical fiber amplifier 1, the optical fiber amplifier 5 comprises pumping light sources 410a and 410b, and a wavelength combiner 440.
  • the description of the optical fiber amplifier 1 should be referred to, and detailed description thereof will be omitted here.
  • Pumping light source 410a and pumping light source 410b output transverse single mode light with wavelengths of, for example, 1460 nm and 1485 nm, respectively.
  • the pumping light Lea output from pumping light source 410a and the pumping light Leb output from pumping light source 410b are wavelength-multiplexed in wavelength combiner 440.
  • the pumping light Lea and the pumping light Leb are polarization-multiplexed by wavelength combiner 440, and the resulting pumping light Le is output from wavelength combiner 440 to optical multiplexer 20.
  • the optical fiber amplifier 5 is equipped with two pumping light sources, but the number of pumping light sources is not limited to two.
  • the optical fiber amplifier according to the fifth embodiment may be equipped with three or more pumping light sources. In other words, the optical fiber amplifier according to the fifth embodiment may be equipped with multiple pumping light sources.
  • the diameter of the inner cladding can be reduced and the ratio of the core area to the inner cladding area can be increased, thereby improving the pumping efficiency. Furthermore, in the optical fiber amplifier of the fifth embodiment, the intensity of the pumping light can be further increased by increasing the number of pumping light sources.
  • the optical fiber amplifier 5 is equipped with an EDF 50 as a double-clad optical fiber, but the optical fiber amplifier 5 may also be equipped with an EDF 150 instead of the EDF 50.

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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)

Abstract

Un amplificateur à fibre optique (50) comprend : une fibre optique à double gaine formée à partir de verre de quartz et comprenant une pluralité de cœurs (51) auxquels un élément de terre rare est ajouté, une gaine interne (52a) qui contient la pluralité de cœurs (51), et une gaine externe (52b) qui comporte la gaine interne (52a) ; et une source de lumière d'excitation qui délivre une lumière d'excitation monomode latérale à la fibre optique à double gaine. La surface totale de la pluralité de noyaux (51) est supérieure ou égale à 10 % par rapport à la surface de la gaine interne (52a).
PCT/JP2025/010440 2024-03-22 2025-03-18 Amplificateur à fibre optique Pending WO2025197905A1 (fr)

Applications Claiming Priority (2)

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JP2024046683 2024-03-22
JP2024-046683 2024-03-22

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WO2025197905A1 true WO2025197905A1 (fr) 2025-09-25

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Publication number Priority date Publication date Assignee Title
WO2006132285A1 (fr) * 2005-06-07 2006-12-14 The Furukawa Electric Co., Ltd. Source de lumière
JP2010272827A (ja) * 2009-05-25 2010-12-02 Fujikura Ltd 光ファイバカプラ及び光ファイバ増幅器
WO2012173271A1 (fr) * 2011-06-16 2012-12-20 古河電気工業株式会社 Structure de couplage optique et amplificateur à fibre optique
JP2015510253A (ja) * 2011-12-13 2015-04-02 オーエフエス ファイテル，エルエルシー マルチコアエルビウムドープファイバアンプ
JP2017045967A (ja) * 2015-08-28 2017-03-02 日本電信電話株式会社 光ファイバ増幅器
US20230119153A1 (en) * 2021-10-19 2023-04-20 Raytheon Company Architecture for high-power thulium-doped fiber amplifier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132285A1 (fr) * 2005-06-07 2006-12-14 The Furukawa Electric Co., Ltd. Source de lumière
JP2010272827A (ja) * 2009-05-25 2010-12-02 Fujikura Ltd 光ファイバカプラ及び光ファイバ増幅器
WO2012173271A1 (fr) * 2011-06-16 2012-12-20 古河電気工業株式会社 Structure de couplage optique et amplificateur à fibre optique
JP2015510253A (ja) * 2011-12-13 2015-04-02 オーエフエス ファイテル，エルエルシー マルチコアエルビウムドープファイバアンプ
JP2017045967A (ja) * 2015-08-28 2017-03-02 日本電信電話株式会社 光ファイバ増幅器
US20230119153A1 (en) * 2021-10-19 2023-04-20 Raytheon Company Architecture for high-power thulium-doped fiber amplifier

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