WO2021059443A1 - 増幅用ファイバ及び光増幅器 - Google Patents

増幅用ファイバ及び光増幅器 Download PDF

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Publication number
WO2021059443A1
WO2021059443A1 PCT/JP2019/037913 JP2019037913W WO2021059443A1 WO 2021059443 A1 WO2021059443 A1 WO 2021059443A1 JP 2019037913 W JP2019037913 W JP 2019037913W WO 2021059443 A1 WO2021059443 A1 WO 2021059443A1
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Prior art keywords
core
cores
amplification
amplification fiber
fiber
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Ceased
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PCT/JP2019/037913
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English (en)
French (fr)
Japanese (ja)
Inventor
青笹　真一
泰志 坂本
中島　和秀
雅樹 和田
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to JP2021548088A priority Critical patent/JPWO2021059443A1/ja
Priority to US17/762,403 priority patent/US20220344888A1/en
Priority to PCT/JP2019/037913 priority patent/WO2021059443A1/ja
Publication of WO2021059443A1 publication Critical patent/WO2021059443A1/ja
Anticipated expiration legal-status Critical
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    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • 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
    • H01S3/06758—Tandem amplifiers
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0064—Anti-reflection devices, e.g. optical isolaters
    • 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
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/06766—C-band amplifiers, i.e. amplification in the range of about 1530 nm to 1560 nm
    • 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
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/0677—L-band amplifiers, i.e. amplification in the range of about 1560 nm to 1610 nm
    • 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
    • H01S3/094069—Multi-mode pumping
    • 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
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
    • 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
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • H01S3/2391—Parallel arrangements emitting at different wavelengths

Definitions

  • the present disclosure relates to an optical amplifier arranged in an optical communication system using a spatial multiplexing (multi-core or multi-mode) optical fiber, and an amplification fiber provided therein.
  • a spatial multiplexing (multi-core or multi-mode) optical fiber and an amplification fiber provided therein.
  • Non-Patent Document 1 In a single-mode optical fiber optical communication system, an optical amplifier that amplifies an optical signal as it is without converting it into electricity has been put into practical use. Similarly, in an optical communication system using a spatial multiplexing optical fiber, a spatial multiplexing optical amplifier is expected (see, for example, Non-Patent Document 1).
  • clad excitation configuration As an optical amplifier for spatial multiplexing, a configuration in which excitation light is individually supplied to the amplification core (core excitation configuration) and a configuration in which the excitation light is supplied to the cladding (clad excitation configuration) are known.
  • the clad excitation configuration can simultaneously amplify a plurality of spatial channels propagating in the clad, and the configuration can be simplified as compared with the core excitation configuration.
  • the clad excitation configuration is expected to reduce power consumption as compared with the configuration using an optical amplifier for core excitation for the number of spatial channels (see, for example, Non-Patent Document 2).
  • a multimode LD can be used as the light source, and the photoelectric conversion efficiency can be improved as compared with the core excitation configuration in which a single mode laser diode (LD) must be adopted as the light source.
  • LD single mode laser diode
  • the clad excitation configuration has a problem that the excitation light incident on the clad that is not bonded to the core is not used for amplifying the optical signal, and the amplification efficiency is inferior to that of the core excitation configuration.
  • an object of the present invention is to provide an amplification fiber and an optical amplifier having a clad excitation configuration that improve the amplification efficiency in order to solve the above problems.
  • the amplification fiber according to the present invention is made to lengthen the amplification fiber until a desired amplification factor is obtained, and rare earth ions are generated according to the band of the signal light propagating in the core. It was decided to make the distance of the added core different.
  • the amplification fiber according to the present invention is a multi-core amplification fiber having a plurality of cores in a clad from one end to the other end, and from one end to the other end for each type of core.
  • the total distance to which the rare earth ions are added is different.
  • the excitation light incident on the cladding increases the light that binds to the core, increasing the amplification efficiency.
  • the distance of the core to which the rare earth ion for obtaining the desired amplification factor is added differs depending on the band of the signal light. Therefore, when the band of the signal light is different for each core, the total distance of the cores to which the rare earth ion is added is different for each band.
  • the present invention can provide an amplification fiber having a clad excitation configuration that improves amplification efficiency.
  • the amplification fiber according to the present invention may have a section between the one end and the other end in which the rare earth ion is not added to all of the cores.
  • the sections to which the rare earth ions are added may be discontinuous.
  • the refractive index distribution may differ depending on the type of the core.
  • the concentration distribution of the rare earth ions may be different for each type of the core in the cross section of the section in which the rare earth ions are added to all of the cores.
  • the cores of the amplification fiber according to the present invention are arranged so that cores of the same type are not adjacent to each other. Since signal lights having different bands propagate to adjacent cores, the requirements for crosstalk between cores can be relaxed and the cores can be brought close to each other. That is, the excitation light density of the clad can be increased, so that the amplification efficiency is improved.
  • the optical amplifier according to the present invention includes the amplification fiber and a light incident portion in which excitation light is incident on the clad of the amplification fiber and signal light is incident on the core of the amplification fiber.
  • the light incident portion is characterized in that the signal light is incident on the core of a different type for each band.
  • the present invention includes the amplification fiber, it is possible to provide an optical amplifier having a clad excitation configuration that improves amplification efficiency.
  • the amplification fiber of the optical amplifier according to the present invention may propagate the signal light in a multi-mode.
  • the present invention can provide an amplification fiber and an optical amplifier having a clad excitation configuration that improves amplification efficiency.
  • FIG. 1 is a diagram illustrating an amplification fiber 10 of the present embodiment.
  • the amplification fiber 10 is a multi-core amplification fiber having a plurality of cores 11b in the clad 11a from one end E1 to the other end EE, and rare earth ions from one end E1 to the other end EE are generated for each type of core 11b. It is characterized in that the total distance added is different.
  • the amplification fiber 10 has four cores (11b-1 to 4).
  • the number of cores is not limited to four.
  • the core of the amplification fiber 10 is classified into two types. One type is core 11b-1 and core 11b-3, and the other type is core 11b-2 and core 11b-4.
  • the types of cores are not limited to two.
  • the amplification fiber 10 is composed of a first amplification fiber 10-1 and a second amplification fiber 10-2.
  • the first amplification fiber 10-1 has a predetermined length (for example, 15 m) from one end of E1.
  • the length of each amplification fiber is an example.
  • Rare earth ions are added to the four cores (11b-1 to 4).
  • Rare earth ions are, for example, erbium ions.
  • the rare earth ions added are not limited to erbium ions.
  • rare earth ions are added to both the first amplification fiber 10-1 and the second amplification fiber 10-2, but the core 11b-1 and the core 11b-3 Rare earth ions are added only to the first amplification fiber 10-1.
  • This section is connected by a multi-core fiber (not shown) having the same structure as the first amplification fiber 10-1 and the second amplification fiber 10-2.
  • the structure is a clad diameter, a core diameter, a number of cores, a core arrangement, and a refractive index distribution of the cores.
  • the signal light once incident on the core 11b-1 at E1 is incident on the core corresponding to the core 11b-1 of the multi-core fiber from the core 11b-1 of the first amplification fiber 10-1, and further, the multi-core. It is incident on the core 11b-1 of the second amplification fiber 10-2 from the fiber.
  • the distance between the one end E1 and the other end EE in the section to which the rare earth ion is added differs depending on the type of core.
  • the total distance is about 15m.
  • the signal light propagating in the core 11b-1 and the core 11b-3 is amplified only in the section of the first amplification fiber 10-1, and the signal light propagating in the core 11b-2 and the core 11b-4 is the first signal light. It is amplified in the section between the amplification fiber 10-1 and the second amplification fiber 10-2.
  • the amplification of signal light in the L band (1565-1625 nm) using an erbium-added fiber (EDF) is the C band if the same amplification factor as the optical signal in the C band (1530 to 1565 nm) is to be amplified.
  • EDF erbium-added fiber
  • the parameter for adjusting the amplification factor can be adjusted not only by the total distance at which rare earth ions are added to the core, but also by the refractive index distribution of the core and the concentration distribution of rare earth ions in the cross section.
  • FIG. 2 is a cross-sectional view illustrating the amplification fiber 10 of the present embodiment.
  • the amplification fiber 10 of the present embodiment is a 6-core amplification fiber.
  • FIG. 2 (A) is the first amplification fiber 10-1
  • FIG. 2 (B) is the second amplification fiber 10-2.
  • Rare earth ions are added to the cores (11b-1, 11b-3, 11b-5) of the first amplification fiber 10-1, but the cores (11b-1, 11b-3) of the second amplification fiber 10-2. , 11b-5) are additive-free.
  • the cores (11b-2, 11b-4, 11b-6) rare earth ions are added to both the first amplification fiber 10-1 and the second amplification fiber 10-2.
  • the cores (11b-1, 11b-3, 11b-5) propagate the C-band optical signal
  • the cores (11b-2, 11b-4, 11b-6) propagate the L-band signal light. Both signal lights can be amplified with the same amplification factor by the excitation light of the clad 11a.
  • the cores (11b-1, 11b-3, 11b-5) are the cores of the first type and the cores (11b-2, 11b-4, 11b-6) are the cores of the second type
  • the cores. 11b is preferably arranged so that cores of the same type are not adjacent to each other.
  • FIG. 3 is a diagram illustrating the optical amplifier 301 of the present embodiment.
  • the optical amplifier 301 With the amplification fiber 10 described in the first or second embodiment,
  • the light incident portion 21 in which the excitation light L1 is incident on the clad 11a of the amplification fiber 10 and the signal light Ls is incident on the core 11b of the amplification fiber 10 With
  • the light incident portion 21 is characterized in that the signal light Ls is incident on the core 11b of a different type for each band.
  • the optical amplifier 301 includes an excitation light source 20 that generates excitation light L1, a light incident portion 21, an amplification fiber 10, and an isolator 22.
  • the optical amplifier 301 is arranged between the wavelength division multiplexing optical transmission line 51 and the optical transmission line 52.
  • the wavelength-multiplexed signal light Ls propagating in the optical transmission line 51 is demultiplexed for each wavelength band by the band-multiplexer 31.
  • the band combiner / demultiplexer 31 separates the signal light Ls into two bands, a C band and an L band.
  • the signal light Ls of the C band and the L band is incident on each core of the multi-core fiber by the fan-in (FI) 32 of the light incident portion 21.
  • the signal light Ls of the C band is incident on the core of the multi-core fiber corresponding to the core (11b-1, 11b-3), and the signal light Ls of the L band is the core (11b-1, 11b-3). It is incident on the core of the multi-core fiber corresponding to 11b-2, 11b-4).
  • the excitation light source 20 is, for example, a multimode LD that outputs excitation light L1 (for example, a wavelength of 0.92 ⁇ m) in multimode.
  • the combiner 33 of the light incident portion 21 incidents the signal light Ls of each core of the multi-core fiber into each core 11b of the amplification fiber 10, and causes the excitation light L1 from the excitation light source 20 to be incident on the clad 11a of the amplification fiber 10.
  • the signal light Ls in the C band is incident on the cores (11b-1, 11b-3) of the first amplification fiber 10-1
  • the signal light Ls in the L band is the first amplification fiber 10-1. It is incident on the core (11b-2, 11b-4) of.
  • the first amplification fiber 10-1 in which the C-band and L-band amplification cores are alternately arranged, and the L-band amplification core and the non-amplification core are alternately arranged. It is composed of the second amplification fiber 10-2.
  • the amplification fiber 10 amplifies the signal light Ls of each core 11b by coupling the excitation light L1 from the clad 11a to the core 11b.
  • the second amplification fiber 10-2 to which rare earth ions are added only to the cores (11b-2, 11b-4) (the other cores are not added) is used as the first amplification fiber. Connect to the latter stage of 10-1. That is, in the second amplification fiber 10-2, as shown in FIG. 1, rare earth ions are added to the cores (11b-2, 11b-4) through which the signal light Ls of the L band propagates for amplification.
  • rare earth ions are added to the cores (11b-1, 11b-3) through which the signal light Ls in the C band propagates. It has not been.
  • the excitation light L1 remaining in the first amplification fiber 10-1 can be used as it is for amplification in the L band.
  • the optical amplifier 301 does not need to be provided with an excitation light source in each of the first amplification fiber 10-1 and the second amplification fiber 10-2, and the amplification efficiency can be improved.
  • the isolator 22 blocks the excitation light L1 so that the remaining excitation light L1 that is not used in the second amplification fiber 10-2 does not flow out to the subsequent stage, and outputs only the signal light Ls to the subsequent stage.
  • the signal light Ls amplified by each core of the amplification fiber 10 is separated into a C band and an L band by a fan-out (FO) 34, then multiplexed by a band duplexer 35 and incident on a transmission line 52.
  • FO fan-out
  • the 4-core amplification fiber 10 of FIG. 1 has been described, but the same applies to the 6-core amplification fiber 10 of FIG. 2 and the number of cores larger than that.
  • the amplification fiber 10 may be in single mode or multimode.
  • the optical amplifier of the above-described embodiment has two bands of signal light to be amplified, but the band of amplification is not limited to two.
  • An optical amplifier that amplifies three or more bands can be formed by making a difference in the total distance to which rare earth ions are added from one end to the other end of the amplification fiber 10 for each core having a different band. At this time, as described with reference to FIG. 2, the cores are arranged so that the same bands are not adjacent to each other.
  • This optical amplifier 2n (n ⁇ 1) cores to which rare earth ions are added are arranged in the first clad 11a, and the first multi-core transmission optical amplifier fiber having a second clad (not shown) for confining excitation light.
  • n C-band amplification cores are erbium-non-doped cores
  • n L-band amplification cores are connected to the subsequent stage of the first amplification fiber, which is an erbium-doped core.
  • the optical amplification fiber of the description 2 An excitation light generator that generates excitation light in the amplification fiber, An excitation light combiner for coupling the excitation light and N signal lights in a certain band are incident on n non-adjacent cores of the amplification fiber, and light in a band different from the signal light incident on the n cores is not adjacent to the rest of the amplification fiber. Inputs incident on n cores and It is characterized by having.
  • the optical amplifier of (1) above is The rare earth added to the amplification fiber is at least erbium, and the two amplification bands are C band (1530-1565 nm) and L band (1565-1620 nm).
  • the optical amplifier according to any one of (1) to (3) above is Each core of the first and second amplification fibers has a core structure capable of propagating M modes.
  • the optical amplifier according to any one of (1) to (4) above is A multi-core structure having a core arrangement such that the same bands are not adjacent to each other is used so as to amplify three or more different bands at the same time.
  • This optical amplifier has the following effects and features.
  • This optical amplifier contributes to further increasing the excitation light density by allocating different bands to the adjacent cores of the amplification core, and is efficient by connecting amplification fibers having different characteristics in a longitudinal manner in the subsequent stage. Achieve optical amplification.
  • the present invention provides a highly efficient optical amplifier, and can realize long-distance, large-capacity transmission with low power consumption as compared with the conventionally used optical amplification technology.
  • Amplification fiber 10-1 First amplification fiber 10-2: Second amplification fiber 11a: Clad 11b, 11b-1 to 11b-6: Core 20: Excitation light source 21: Light incident part 22: Isolator 31 : Band demultiplexer 32: Fan-in (FI) 33: Combiner 34: Fan out (FO) 35: Band demultiplexer 51, 52: Transmission line 301: Optical amplifier

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
PCT/JP2019/037913 2019-09-26 2019-09-26 増幅用ファイバ及び光増幅器 Ceased WO2021059443A1 (ja)

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JP2021548088A JPWO2021059443A1 (https=) 2019-09-26 2019-09-26
US17/762,403 US20220344888A1 (en) 2019-09-26 2019-09-26 Amplification fiber and optical amplifier
PCT/JP2019/037913 WO2021059443A1 (ja) 2019-09-26 2019-09-26 増幅用ファイバ及び光増幅器

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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