WO2021100275A1 - 光カプラ及び光増幅器 - Google Patents

光カプラ及び光増幅器 Download PDF

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Publication number
WO2021100275A1
WO2021100275A1 PCT/JP2020/031975 JP2020031975W WO2021100275A1 WO 2021100275 A1 WO2021100275 A1 WO 2021100275A1 JP 2020031975 W JP2020031975 W JP 2020031975W WO 2021100275 A1 WO2021100275 A1 WO 2021100275A1
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Prior art keywords
core
optical
optical fiber
cores
coupling
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Ceased
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PCT/JP2020/031975
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English (en)
French (fr)
Japanese (ja)
Inventor
雄太 若山
釣谷　剛宏
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KDDI Corp
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KDDI Corp
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Priority to EP20888784.4A priority Critical patent/EP4064468B1/en
Priority to CN202080061606.XA priority patent/CN114341688B/zh
Publication of WO2021100275A1 publication Critical patent/WO2021100275A1/ja
Priority to US17/687,344 priority patent/US12506316B2/en
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
    • 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
    • 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
    • G02B6/2804—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
    • G02B6/2852—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 tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)
    • 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
    • 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
    • H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • 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
    • H01S3/094049—Guiding of the pump light
    • H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
    • 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

Definitions

  • the present invention relates to an optical coupler and an optical amplifier.
  • Non-Patent Document 1 discloses a polishing type optical coupler.
  • the polishing type optical coupler disclosed in Non-Patent Document 1 is obtained by polishing the cladding of two single mode (SM) optical fibers so that the cores of the two SM optical fibers are arranged close to each other. By arranging the cores of the two SM optical fibers close to each other, the signal light propagating in one core can be transferred to the other core.
  • Non-Patent Document 1 also discloses that optical couplers having various coupling ratios can be obtained by adjusting the distance between the cores and the length of the cores.
  • the MC optical fiber is an optical fiber having a plurality of cores.
  • a set of optical transmitters and optical receivers transmit and receive signal light via one core of the MC optical fiber. Therefore, for example, in an optical communication system using an MC optical fiber having P cores (P is an integer of 2 or more), the cores of P single core (SC) optical fibers and the MC optical fiber are used.
  • P is an integer of 2 or more
  • SC single core
  • An optical component that connects P cores is required.
  • the optical component connecting the P cores of the SC optical fiber and the P cores of the MC optical fiber will be referred to as a P core MC type optical coupler.
  • the abrasive optical coupler disclosed in Non-Patent Document 1 is applied to an MC optical fiber, and each of the cores of the P SC optical fibers is arranged close to one of the P cores of the MC optical fiber.
  • a P-core MC type optical coupler can be generated.
  • the clad of the MC optical fiber is provided with a marker for identifying and identifying each core. Since the marker has a refractive index different from that of the core and the clad, the coupling ratio between the core arranged near the marker among the plurality of cores of the MC optical fiber and the core of the SC optical fiber is that of the MC optical fiber. It deteriorates as compared with the coupling rate between other cores and the core of the SC optical fiber.
  • the optical coupler has a first member to an Nth member (N is an integer of 2 or more), and a Kth member (K is an integer from 1 to N) is on the circumference.
  • the first core to the P (P is an integer of N or more) cores arranged at equal intervals, and the markers arranged at the positions closest to the first core among the first cores to the P cores.
  • the core of the single-core optical fiber of the K member includes the multi-core optical fiber having the above and one or more single-core optical fibers, and the core of the single-core optical fiber of the K member is the first core of the first core to the P core.
  • each core of the multi-core optical fiber of the Mth member (M is an integer from 1 to N-1) is connected to each core of the multi-core optical fiber of the (M + 1) member.
  • the total number of the single-core optical fibers contained in the first member to the Nth member is P, and P cores of the multi-core optical fiber configured by the connection of the first member to the Nth member. Each is coupled to one of the P cores of the single-core optical fiber contained in the first member to the Nth member.
  • the difference in the coupling ratio of the multi-core optical fiber with each core can be reduced.
  • Sectional drawing of 4-core MC optical fiber It is explanatory drawing of the generation method of the optical member used in the 4-core MC type optical coupler by one Embodiment.
  • the explanatory view of the structure of the 4-core MC type optical coupler by one Embodiment The explanatory view of the structure of the 4-core MC-EDF according to one embodiment.
  • FIG. 1 shows a cross section of an MC optical fiber 1 used in a 4-core MC type optical coupler in a plane orthogonal to the longitudinal direction.
  • the MC optical fiber 1 has four cores 11 to 14 in the cladding.
  • the cores 11 to 14 are arranged at equal intervals on a circumference having a predetermined radius centered on the center of the cross section.
  • the distance between each core and the center of the cross section is the same, and the angles of the two line segments connecting the two cores adjacent to each other and the center of the cross section (hereinafter, the angle between the cores) are two adjacent cores. Equal for each core combination.
  • the inter-core angle is 2 ⁇ / P.
  • the MC optical fiber 1 has a marker 2 in the cladding.
  • the marker 2 is provided to identify and identify the cores 11 to 14.
  • the core closest to the marker 2 is the core 11, and the core 12, the core 13, and the core 14 can be specified in the clockwise direction from the core 11.
  • the marker 2 is composed of a refractive index different from that of the cores 11 to 14 and the clad.
  • a 4-core MC type optical coupler can be configured by cutting a clad portion from the outer peripheral side of the MC optical fiber 1 and bringing each of the cores of the four SC optical fibers close to each of the cores 11 to 14.
  • the marker 2 is provided in the vicinity of the core 11, the coupling ratio between the core 11 and the core of the SC optical fiber to be coupled to the core 11 is the same as that of the cores 12 to 14 and the core of the SC optical fiber. Deteriorates from the binding rate of. In this embodiment, the difference in the coupling ratio between each core of the MC optical fiber and the core of the SC optical fiber is reduced.
  • the clad is polished from the outer peripheral surface of the MC optical fiber 1 closest to the core 13 having the largest distance from the marker 2.
  • the clad of the SC optical fiber 3 having the core 31 is also polished.
  • the polished surface of the MC optical fiber 1 and the polished surface of the SC optical fiber 3 are fused.
  • a fusion of the polished surface of the MC optical fiber 1 and the polished surface of the SC optical fiber 3 is referred to as an optical member 100.
  • the coupling ratio between the core 31 and the core 13 is the distance between the core 31 and the core 13 and the core 13 and the core 13. It depends on the longitudinal length of the core 31 in close proximity. That is, the amount of polishing of the MC optical fiber 1 and the SC optical fiber 3 and the length in the longitudinal direction to be polished are determined based on the coupling ratio required between the core 13 and the core 31.
  • the core 31 can also be coupled to the core 11, the core 12, and the core 14.
  • the coupling ratio between the core 31 and each of the core 11, the core 12, and the core 14 also depends on the distance between the cores and the distance in the longitudinal direction to be polished. Therefore, more specifically, the amount of polishing of the MC optical fiber 1 and the SC optical fiber 3 and the length in the longitudinal direction to be polished are equal to or less than the predetermined values of the coupling ratio between the core 31 and each of the core 11, the core 12, and the core 14. Alternatively, it is determined to be the minimum (for example, 0, that is, no coupling) and the coupling ratio between the core 31 and the core 13 as the target value.
  • the coupling ratio between the core 31 and each of the core 11, the core 12, and the core 14 is made smaller than the coupling ratio between the core 31 and the core 13.
  • optical member # 1 optical member # 2
  • optical member # 3 optical member # 4
  • FIG. 4A is an explanatory diagram of the configuration of the 4-core MC type optical coupler 1000 according to the present embodiment.
  • the 4-core MC type optical coupler 1000 is formed by connecting four optical members 100 in series.
  • the SC optical fiber 3 is omitted for the sake of simplification of the figure.
  • the cross sections of the optical member # 1 and the optical member # 2 are connected to each other so that the cores are connected to each other by, for example, a fusion treatment. The same applies to the optical member # 2 and the optical member # 3, and the optical member # 3 and the optical member # 4.
  • the core 11 of the optical member # (M + 1) is rotated by ⁇ / 2, that is, by the angle between the cores with respect to the core 11 of the optical member #M (M is an integer of 1 to 3 in this example).
  • M is an integer of 1 to 3 in this example.
  • FIG. 4B shows the connection state of each core when connected as described above.
  • the shaded core indicates a coupled core that is coupled to the core 31 of the SC optical fiber 3.
  • a cross section different from the cross section connected to the optical member # 3 of the optical member # 4 is connected to the MC optical fiber 4.
  • the MC optical fiber 4 has the same configuration as the MC optical fiber 1. Assuming that the coupling ratio between the core 13 of each optical member 100 and the core 31 of the SC optical fiber 3 is 1, the signal light from the core 31 of the SC optical fiber 3 of the optical member # 1 is sent to the core 13 of the optical member # 1. It is incident, and thus is incident on the core 13 of the MC optical fiber 4.
  • the signal light from the core 31 of the SC optical fiber 3 of each of the optical member # 2, the optical member # 3, and the optical member # 4 is incident on the cores 14, 11 and 12 of the MC optical fiber 4. Therefore, the signal light from the four SC optical fibers can be incident on each of the four cores of the MC optical fiber 4.
  • the signal lights # 1 to # 4 output by four different optical transmitters are incident on the core 31 of the SC optical fiber 3 of the optical members # 1 to # 4, respectively, the signal lights # 1 to # # 4 can be incident on the cores 13, 14, 11 and 12 of the MC optical fiber 4.
  • the signal light incident on the 4-core MC type optical coupler 1000 from the cores 11, 12, 13 and 14 of the MC optical fiber 4 is the optical member # 3, respectively.
  • the optical member # 4, the optical member # 1 and the optical member # 2 are incident on the core 31 of the SC optical fiber 3. Therefore, the signal lights # 1 to # 4 propagating through the cores 11 to 14 of the MC optical fiber 4 are transmitted through the core 31 of the SC optical fiber 3 of the optical members # 1 to # 4, and four different optical receivers. Can be incident on.
  • the cores 31 of the four SC optical fibers 3 of the optical member # 1 to the optical member # 4 are all on the same core 13 of the MC optical fiber 1 of the same optical member. It is combined. Therefore, four cores formed by connecting the optical members # 1 to the optical members # 4 in series (one row in the table of FIG. 4B corresponds to one core) and the core of each SC optical fiber The difference in binding rate becomes smaller.
  • the core 13 of the MC optical fiber 1 is coupled to the core 31 of the SC optical fiber 3, but it can also be coupled to the core 12 and the core 14. That is, the core of the MC optical fiber 1 coupled to the core 31 of the SC optical fiber 3 may be a core different from the core 11 which is not affected by the marker 2. Further, in the present embodiment, the coupling cores of the MC optical fibers 1 of the optical members # 1 to the optical members # 4 are all cores 13, but the coupling cores are different from the cores 11 which are not affected by the marker 2. Any core may be used, and the optical members # 1 to # 4 do not have to be the same.
  • the coupling core may be the core 12
  • the coupling core may be the core 14.
  • the P cores of the P SC optical fiber and the P core of the MC optical fiber can be coupled to each other by adjusting the cores connected to each other in the connection between the optical members.
  • the P-core MC type optical coupler of this embodiment is composed of a first optical member to a first P optical member.
  • Each of the first optical member to the P optical member is composed of one MC optical fiber having a predetermined length and one SC optical fiber.
  • This MC optical fiber has first to P cores and markers arranged at equal intervals on the circumference. It is assumed that the marker is arranged at the position closest to the first core.
  • the core of the SM optical fiber of the Kth optical member (K is an integer from 1 to P) is coupled to a coupling core different from the first core among the first core to the first P core.
  • the coupling core is one of the second core to the P core, and may be different or the same for each optical member.
  • each core of the MC optical fiber of the Mth optical member (M is an integer from 1 to P-1) is connected to each core of the MC optical fiber of the (M + 1) th optical member.
  • M is an integer from 1 to P-1
  • M + 1 th optical member is connected to each core of the MC optical fiber of the (M + 1) th optical member.
  • the Mth optical member and the (M + 1) th (M + 1) are such that each of the P cores formed by connecting the first optical member to the P optical member in series in order is coupled to the core of one SM optical fiber.
  • the MC optical fiber 1 of the optical member is connected.
  • the first core of the (M + 1) optical member is rotated by 2 ⁇ / P with respect to the first core of the Mth optical member, and the Mth optical member
  • Each core of the MC optical fiber and each core of the MC optical fiber of the first (M + 1) optical member may be connected.
  • FIG. 5 shows the optical member 101 of this embodiment.
  • the optical member 101 is formed by connecting the core 12 of the MC optical fiber 1 and the core 51 of the SC optical fiber 5 and the core 14 of the MC optical fiber 1 and the core 61 of the SC optical fiber 6.
  • the coupling ratio between the core 51 and the cores 11, 13 and 14 of the MC optical fiber 1 is set to the minimum value or a predetermined value or less.
  • the coupling ratio between the core 61 and the cores 11, 12 and 13 of the MC optical fiber 1 is set to the minimum value or a predetermined value or less.
  • N P / 2
  • the two optical members 101 have the same configuration, they will be referred to as an optical member # 1 and an optical member # 2 in order to distinguish the two optical members 101 below.
  • FIG. 6A is an explanatory diagram of the configuration of the 4-core MC type optical coupler 1000 according to the present embodiment.
  • the 4-core MC type optical coupler 1000 is formed by connecting two optical members # 1 and optical members # 2 in series.
  • SC optical fibers 5 and 6 are omitted for the sake of simplification.
  • the optical member # M and the optical member are rotated by ⁇ / 2, that is, by the angle between the cores, with respect to the core 11 of the optical member # 1.
  • FIG. 6B shows the connection state of each core when connected as described above.
  • the shaded core indicates a coupling core that is coupled to the core 51 of the SC optical fiber 5 and the core 61 of the SC optical fiber 6.
  • the MC optical fiber 4 has the same configuration as the MC optical fiber 1. Assuming that the coupling ratio between the coupling core and the core of the SC optical fiber in each optical member 100 is 1, the signal light from the core 51 of the SC optical fiber 5 of the optical member # 1 is incident on the core 12 of the optical member # 1. Therefore, it is incident on the core 12 of the MC optical fiber 4. Further, the signal light from the core 61 of the SC optical fiber 6 of the optical member # 1 is incident on the core 14 of the optical member # 1, and thus is incident on the core 14 of the MC optical fiber 4.
  • the signal light from the core 51 of the SC optical fiber 5 of the optical member # 2 and the core 61 of the SC optical fiber 6 is incident on the core 13 and the core 11 of the MC optical fiber 4, respectively. Therefore, the signal light from the four SC optical fibers can be incident on each of the four cores of the MC optical fiber.
  • one optical member has two SC optical fibers, so that two cores out of the four cores of the MC optical fiber 1 of one optical member serve as coupling cores.
  • the coupling core is a core different from the core 11. Then, by adjusting the cores of the MC optical fibers that are connected to each other in the series connection between the optical members, all of the four cores formed by the series connection between the optical members are made into the cores of any SC optical fiber. Combine. With this configuration, the difference in the coupling ratio between each core of the MC optical fiber and the core of the SC optical fiber can be reduced.
  • the coupling core of each optical member is the same, but it is not necessary for the optical member # 1 and the optical member # 2 to be the same. That is, for example, in the optical member # 1, the coupling core may be the core 12 and the core 13, and in the optical member # 2, the coupling core may be the core 13 and the core 14.
  • the P-core MC type optical coupler of this embodiment is composed of a first optical member to an Nth optical member.
  • Each of the first optical member to the Nth optical member is composed of one MC optical fiber having a predetermined length and two SC optical fibers.
  • This MC optical fiber has first to P cores and markers arranged at equal intervals on the circumference. It is assumed that the marker is arranged at the position closest to the first core. Then, the cores of the two SC optical fibers of the Kth optical member (K is an integer from 1 to N) are coupled to two different coupling cores different from the first core among the first core to the P core. Ru.
  • the coupling core is either a second core to a P-core, and may be different or the same for each optical member.
  • each core of the MC optical fiber of the Mth optical member (M is an integer from 1 to N-1) is connected to each core of the MC optical fiber of the (M + 1) th optical member.
  • the Mth optical member and the (M + 1) th (M + 1) so that each of the P cores formed by connecting the first optical member to the Nth optical member in series in order is coupled to the core of one SC optical fiber.
  • the MC optical fiber 1 of the optical member is connected.
  • the two coupling cores of the first optical member to the Nth optical member are the same, and the cores are located on opposite sides of the center of the MC optical fiber (for example, the core 12 and the core 14 in FIG. 5).
  • the cores are located on opposite sides of the center of the MC optical fiber (for example, the core 12 and the core 14 in FIG. 5).
  • Each core of the MC optical fiber of the member may be connected.
  • each of the P-core MC type optical couplers of the second embodiment was formed by connecting the first optical member having two SC optical fibers to the Nth optical member in series.
  • N 2. That is, in the present embodiment, the P-core MC type optical coupler is configured by connecting two optical members, the first optical member and the second optical member, in series.
  • each optical member has one SC optical fiber
  • in the second embodiment each optical member has two SC optical fibers
  • in the third embodiment the two optical members have two SC optical fibers.
  • Q P / 2 SC optical fibers. That is, in the first to third embodiments, the number of SC optical fibers included in each optical member was the same. However, the number of SC optical fibers and therefore the number of coupling cores can be different for each optical member.
  • the first optical member has three SC optical fibers, and the core 12, the core 13, and the core 14 in FIG. 1 are coupling cores.
  • the second optical member has one SC optical fiber, and the core 13 of FIG. 1 is used as a coupling core. Then, the core 13 of the second optical member is coupled to the core 11 of the first optical member to form a 4-core MC type optical coupler.
  • the P-core MC type optical coupler is composed of the first optical member to the Nth optical member.
  • N is an integer of 2 or more
  • P is an integer of N or more.
  • Each of the first optical member to the Nth optical member is composed of one MC optical fiber having a predetermined length and one or more SC optical fibers.
  • the total number of SC optical fibers included in the first optical member to the Nth optical member is P.
  • the MC optical fiber of each optical member has first to P cores and markers arranged at equal intervals on the circumference. It is assumed that the marker is arranged at the position closest to the first core.
  • the core of the SM optical fiber of the Kth optical member (K is an integer from 1 to N) is coupled to a coupling core different from the first core among the first core to the P core.
  • the binding core is any of the second core to the P core.
  • each core of the MC optical fiber of the Mth optical member (M is an integer from 1 to N-1) is connected to each core of the MC optical fiber of the (M + 1) th optical member.
  • the Mth optical member and the (M + 1) th (M + 1) so that each of the P cores formed by connecting the first optical member to the Nth optical member in series in order is coupled to the core of one SM optical fiber.
  • the MC optical fiber of the optical member is connected.
  • a P-core MC type EDF is used to amplify the signal light of each core.
  • P-core MC type EDF has P cores to which erbium has been added.
  • signal light is amplified by propagating signal light and pump light in an erbium-added core. Therefore, it is necessary to make the pump light generated by the pump light source incident on each core of the P-core MC type EDF. Therefore, in this embodiment, the P-core MC type optical coupler described in the first to fourth embodiments is used. That is, the P-core MC-type EDF of the present embodiment is configured by adding erbium to each of the P cores of the P-core MC-type optical coupler described in the first to fourth embodiments.
  • FIG. 7A is an explanatory diagram of the configuration of the P-core MC type EDF1001 according to the present embodiment.
  • FIG. 7A uses the P-core MC type optical coupler 1000 described in the first embodiment.
  • the cores 11 to 14 of the MC optical fiber 1 are configured to amplify the signal light by the pump light.
  • the MC optical fiber 7 and the MC optical fiber 4 are connected to both ends of the P-core MC type EDF 1001.
  • the core arrangement of the MC optical fiber 7 and the MC optical fiber 4 is the same as that of the MC optical fiber 1.
  • FIG. 7B shows an example of connection between the MC optical fiber 7 and the MC optical fiber 4 and each core of the P core MC type EDF1001.
  • the signal lights # 1 to signal lights # 4 from the cores 11 to 14 of the MC optical fiber 7 are incident on the cores 11 to 14 of the MC optical fiber 4 via the P core MC type EDF1001.
  • the pump light is incident on the core 13 and is used for amplifying the signal light # 3.
  • the pump light incident on the optical member # 2 to the optical member # 4 is used for amplifying the signal light # 4, the signal light # 1, and the signal light # 2.
  • the coupling ratio between cores depends on the wavelength of light, in addition to the distance between cores and the length in the longitudinal direction in close proximity. Normally, in optical amplification, the wavelength of pump light and the wavelength of signal light are different. Therefore, at the wavelength of the pump light, the coupling rate between the core 31 and the core 13 is higher than the first predetermined value, and at the wavelength of the signal light, the coupling rate between the core 31 and the core 13 is set to the second predetermined value.
  • the second predetermined value shall be equal to or less than the first predetermined position.
  • the coupling ratio between the core 31 and the cores 11, 12 and 14 at the wavelength of the pump light does not need to be lower than the minimum value or the predetermined value.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
PCT/JP2020/031975 2019-11-21 2020-08-25 光カプラ及び光増幅器 Ceased WO2021100275A1 (ja)

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CN202080061606.XA CN114341688B (zh) 2019-11-21 2020-08-25 光耦合器以及光放大器
US17/687,344 US12506316B2 (en) 2019-11-21 2022-03-04 Optical coupler and optical amplifier

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JP7161985B2 (ja) * 2019-11-21 2022-10-27 Kddi株式会社 光カプラ及び光増幅器
US20240243539A1 (en) * 2023-01-17 2024-07-18 Ii-Vi Delaware, Inc. Short fiber length multi-core fiber (mcf) erbium-doped fiber amplifiers (edfas)
CN117741873B (zh) * 2024-01-15 2025-04-01 中国电信股份有限公司技术创新中心 纤芯功率耦合器以及固定光分插复用器
KR102929052B1 (ko) * 2024-02-20 2026-02-20 케이에스포토닉스 주식회사 다중코어광섬유 입출력소자

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CN114341688A (zh) 2022-04-12
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JP7161985B2 (ja) 2022-10-27
EP4064468A4 (en) 2023-01-04
CN114341688B (zh) 2024-04-12
EP4064468B1 (en) 2026-02-11
US12506316B2 (en) 2025-12-23

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