WO2001038909A1 - Fibre optique gainee, ensemble fibre optique, procedes de fabrication et substrat pur fibre optique - Google Patents

Fibre optique gainee, ensemble fibre optique, procedes de fabrication et substrat pur fibre optique Download PDF

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Publication number
WO2001038909A1
WO2001038909A1 PCT/JP2000/008278 JP0008278W WO0138909A1 WO 2001038909 A1 WO2001038909 A1 WO 2001038909A1 JP 0008278 W JP0008278 W JP 0008278W WO 0138909 A1 WO0138909 A1 WO 0138909A1
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WO
WIPO (PCT)
Prior art keywords
optical fiber
optical
core
wiring board
optical fibers
Prior art date
Application number
PCT/JP2000/008278
Other languages
English (en)
Japanese (ja)
Inventor
Katsuaki Kondo
Kazuo Imamura
Minoru Yoshida
Norio Naka
Original Assignee
Mitsubishi Cable 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
Priority claimed from JP33223799A external-priority patent/JP2001154039A/ja
Priority claimed from JP2000027013A external-priority patent/JP3393101B2/ja
Priority claimed from JP2000095017A external-priority patent/JP2001281469A/ja
Application filed by Mitsubishi Cable Industries, Ltd. filed Critical Mitsubishi Cable Industries, Ltd.
Publication of WO2001038909A1 publication Critical patent/WO2001038909A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02052—Optical fibres with cladding with or without a coating comprising optical elements other than gratings, e.g. filters
    • 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
    • G02B6/2861—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 fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
    • 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
    • G02B6/36—Mechanical coupling means
    • G02B6/3608—Fibre wiring boards, i.e. where fibres are embedded or attached in a pattern on or to a substrate, e.g. flexible sheets

Definitions

  • the present invention relates to an optical fiber, an optical fiber assembly, and a method for manufacturing the same. Further, the present invention relates to an optical fiber wiring board for optically connecting optical elements, optical circuits, and optical devices to each other. Background art
  • optical fibers having characteristics such as low loss and wide band have been widely used as transmission media.
  • a plurality of optical fibers of the same type having the same length are used.
  • Such a plurality of optical fiber cores may be used after being processed into an optical fiber assembly such as an optical fiber ribbon multi-core in a tape shape.
  • Fig. 18 shows a wiring sheet structure with multi-core optical fibers.
  • the wiring sheet structure shown in Fig. 18 consists of a sheet of eight optical fiber cores 100 that are disassembled from predetermined locations 31 of a multi-core optical fiber 30 including eight optical fiber cores.
  • the optical fiber core wire 100 has the same length on the substrate 20. Since the transmission time of an optical signal is determined by the optical path length (n L), which is the product of the refractive index (n) of the optical fiber core and the optical fiber length (L), each core refractive index (n) Are manufactured so that the same optical fiber 100 is used, the length (L) is adjusted to be the same, and the optical path length (n L) is the same.
  • the physical length (optical fiber length) of a plurality of optical fibers varies, and furthermore, the glass composition varies between the optical fibers and the optical fiber assembly.
  • the optical path length between each optical fiber core wire 100 varies due to the stress and the like when the structure is made, and as a result, the transmission between the optical fiber transmission paths occurs.
  • a transmission time difference (hereinafter, this time difference (AT) is called "skew") occurs.
  • skew transmission time difference
  • transmission times vary by several picoseconds / m.
  • low skew of the optical fiber is mainly a small to Rukoto variation of glass composition, variation of being performed by the controlling the length of the optical fiber 1 0 0 (glass composition
  • the size can be reduced by using the same material, but in high-speed transmission of 1 terabit / sec or more, it is required that the skew be 1 bsec or less.
  • it is difficult to control the length by controlling the length and since the transmission time varies depending on the temperature of the optical fiber and the state of the applied stress, the skew is adjusted by changing the temperature and the state of the stress. Although it is possible, it is not practical to maintain the state after controlling the skew by temperature and stress. Therefore, a method that can adjust the skew is desired.
  • the optical fiber length (L) of each optical fiber core and the stress application state vary depending on the mounting accuracy of the connector.
  • the optical path length of each optical fiber core varies, and skew occurs due to the connector mounting accuracy.
  • the inventor of the present application measured the skew characteristics of the wiring sheet structure shown in FIG. 19 in order to investigate the occurrence of skew due to the mounting accuracy of the connector.
  • the wiring sheet structure shown in Fig. 19 is composed of a multi-core optical fiber 30a and 30b including eight optical fiber core wires of the same type, each having the same length.
  • the line 100 is on the sheet substrate 20.
  • a multi-core connector 40 international standard IEC61754-5: type MT connector
  • a single-core connector 50 international standard IEC61754- 6: type U connector
  • the ports of the optical fiber core wire 100 are named as port numbers A1 to A16. Distribution
  • Distribution The standard wiring length between the connectors at both ends of the 16 optical fiber cores 100 is 500 mm, and the optical fiber cores 100 should be equal lengths to minimize skew. Wired.
  • Figure 20 shows the measured skew characteristics.
  • the vertical axis represents the skew characteristic [ps]
  • the horizontal axis represents the port numbers (A 1 to A 16) of the optical fiber core 100.
  • the difference between the maximum value (A 7) and the minimum value (A 1 or A 5) of the skew characteristic was 1.17 ps.
  • the measurement wavelength when measuring the skew characteristics was 1550 nm, and the measurement accuracy was about 0.02 ps.
  • the skew characteristics were evaluated by converting the optical path length measurement by Optical Low-Coherence Reflectometry into skew, and the equipment used for the measurement was manufactured by Ando Electric (AQ7410).
  • this wiring sheet structure is defective.
  • the skew of the optical fiber core 100 of port numbers A1 and A5 can be increased by 0.17 ps or more, the skew of the optical fiber core core 100 of port number A7 will be Since the difference can be made within 1.0 s, this wiring sheet structure can be a good product.
  • the yield can be improved, and the manufacturing cost can be significantly reduced.
  • the wiring sheet structure as described above in other words, an optical fiber wiring having a plurality of optical fibers laid in a predetermined pattern on a substrate in order to optically connect optical elements, optical circuits, and optical devices to each other.
  • the plate does not cause the optical fiber to bend.
  • stress is applied to the optical fiber, which makes it more difficult to achieve low skew, deteriorates the mechanical stability of the optical fiber, and increases the transmission loss of the optical fiber. Because it changes.
  • optical fiber wiring boards are used to collectively store a plurality of optical fibers in optical devices, optical circuits, and optical devices, the optical fibers in the optical fiber wiring board are usually , How Even so, deflection often occurs.
  • a conventional optical fiber wiring board for example, the one disclosed in Japanese Patent Application Laid-Open No. H11-111933 can be cited.
  • This publication discloses, as a method of manufacturing an optical fiber substrate, a method of bonding and fixing a plurality of optical fibers using an adhesive layer (including an adhesive layer) formed on the substrate.
  • an optical fiber wiring board manufactured by this method a crossing portion where a plurality of optical fibers cross each other is formed, and in this portion, a region where the optical fiber does not adhere to the adhesive layer on the substrate occurs, and as a result, The optical fiber bends at the intersection.
  • FIG. 21 (a) is a perspective view schematically showing an intersection of the optical fiber wiring board 700
  • FIG. 21 (b) is a view taken along the line 1B-1B in (a).
  • the optical fiber wiring board 700 shown in FIG. 21 includes a substrate 710, an adhesive layer 720 formed on the substrate 710, and a plurality of optical fibers 7 laid on the adhesive layer 720. It has 30. Each optical fiber 730 is fixed on the substrate 710 by an adhesive layer 720. At the intersection XI, an optical fiber (hereinafter, referred to as a “lower optical fiber”) 730 (hereinafter, referred to as an “upper optical fiber”) laid so as to pass over the 70a. A region where b cannot directly contact the adhesive layer 720 is formed. Further, as shown in FIG.
  • the optical fiber is bent, and the optical fiber is deformed or moved by an external force, and the mechanical stability is reduced. If the optical fiber bends, the change in the curvature changes the transmission loss of the optical fiber, and it becomes difficult to match the wiring length of the optical fiber with the design value.
  • the above-mentioned Japanese Patent Application Laid-Open No. 11-19033 discloses that an optical fiber laid on a substrate is covered with a filler in order to reinforce the intersection. This way According to the above, although the manufactured optical wiring board has high mechanical stability, it is impossible to suppress or prevent the occurrence of the bending of the optical fiber at the intersection. Therefore, the mechanical stability in the manufacturing process until the step of covering with the filler is completed is low. Also, it is difficult to control the transmission loss of the optical fiber and the wiring length of the optical fiber.
  • the two optical fibers are routed on the substrate 20 at the intersection where they cross each other.
  • One of the optical fibers 100b is routed over the other optical fiber 100a, and the optical fiber 100b bends.
  • the transmission loss of 0b may increase, and the probability of breakage of the optical fiber 10b may increase.
  • the optical fiber 100b crosses the optical fiber 100a, the optical fiber 100b is pressed against the optical fiber 100b to apply a lateral pressure to the optical fiber 100a, thereby increasing transmission loss. Further, there is a problem that the optical fiber 100 is deformed or moved by an external force, and mechanical stability is reduced.
  • the present invention has been made to solve the above problems, and its main purpose is to control the optical path length within a set value with high accuracy using a simple process, thereby adjusting the skew.
  • An optical fiber core and an optical fiber assembly are provided.
  • Another object of the present invention is to provide a method for manufacturing such an optical fiber core and an optical fiber assembly.
  • another object of the present invention is to c in addition to provide an optical fiber wiring board occurrence of deflection of the fiber-I path is suppressed or prevented at the intersection, in the configuration of the intersection, losses due to cross
  • Another object of the present invention is to provide an optical fiber wiring board which is mechanically stable without any increase. Disclosure of the invention
  • An optical fiber core according to the present invention is an optical fiber core having a core and a clad, wherein the core has a region in which the refractive index is selectively changed by a light-induced refractive index change, whereby The optical path length is controlled within a set value.
  • An optical fiber assembly is an optical fiber assembly having a plurality of optical fiber cores, wherein each of the plurality of optical fiber cores is a core and a clad. At least one of the cores of the plurality of optical fiber cores has a region in which the refractive index is selectively changed by a light-induced refractive index change. Variations in the optical path lengths of the plurality of optical fiber cores are controlled within a set value.
  • a method of manufacturing an optical fiber core according to the present invention includes the steps of preparing an optical fiber core having a core that causes a light-induced refractive index change by light irradiation and a clad surrounding the core. Measuring the optical path length, and changing the refractive index by selectively irradiating light to a partial area of the core so that the optical path length matches a set value.
  • a method for manufacturing an optical fiber assembly according to the present invention is a method for manufacturing an optical fiber assembly having a plurality of optical fiber cores, wherein a core causing a light-induced refractive index change by light irradiation, and a clad surrounding the core Preparing a plurality of optical fiber cores having; anda step of measuring the optical path length of each of the plurality of optical fiber cores; and each of the plurality of optical path lengths being within a set value range. Changing the refractive index by selectively irradiating at least one region of the core of at least one optical fiber core wire of the plurality of optical fiber core wires.
  • the method further includes attaching a connector to at least one end of each of the plurality of optical fiber cores, and the step of changing the refractive index is performed before or after the connector attaching step.
  • An optical fiber wiring board includes: a substrate having a main surface; an adhesive layer provided on the main surface; and a plurality of optical fibers provided on the adhesive layer. Two of the fibers have a plurality of intersections where the optical fibers intersect with each other, and at each of the plurality of intersections, one of the two optical fibers which intersect with each other has the adhesive fiber The other fiber is adhered to the layer and the other optical fiber is disposed in contact with the one optical fiber, thereby achieving the above object.
  • the plurality of optical fibers are equal in length.
  • each of the plurality of optical fibers has a portion bent in a plane parallel to the main surface, and a linear portion, and at least both ends of the bent portion of the plurality of optical fibers are bonded to the adhesive layer. It is preferable that each of the plurality of intersections is formed by a linear portion of the other optical fiber.
  • the shape of the bent portion is preferably an arc shape. More preferably, the arc is part of the circumference (typically a quarter).
  • the other one of the two optical fibers intersecting with each other is disposed so as to pass over the one optical fiber with a predetermined radius of curvature. Is preferred.
  • Another optical fiber wiring board includes a substrate, an adhesive layer provided on the substrate, and a plurality of optical fibers wired on the substrate, and two of the plurality of optical fibers.
  • the plurality of optical fibers have a plurality of intersecting portions intersecting with each other, and at each of the plurality of intersecting portions, one of the two optical fibers intersecting with each other is embedded in the adhesive layer.
  • the other optical fiber is disposed in contact with the one optical fiber and the adhesive layer.
  • the plurality of optical fibers are covered with a filler.
  • each of the plurality of optical fibers has a core and a clad, and at least one of the plurality of optical fibers has a refractive index selectively by a light-induced refractive index change. It has a changed area, whereby the variation of the optical path length of each of the plurality of optical fibers is controlled within a set value.
  • FIG. 1 is a cross-sectional view schematically showing an optical fiber core wire 10 according to the first embodiment of the present invention.
  • FIG. 2 is a graph showing the core refractive index of the photoinduced refractive index change region.
  • FIG. 3 is a graph showing a change in skew characteristics with respect to an ultraviolet irradiation energy density.
  • FIG. 4 is a flowchart illustrating a method of manufacturing the optical fiber core wire 10 according to the first embodiment.
  • FIG. 5 is a plan view schematically showing an optical fiber assembly 200 according to the second embodiment of the present invention.
  • FIG. 6 is a front chart showing the method of manufacturing the optical fiber assembly 200 according to the second embodiment.
  • FIG. 7 is a schematic view of the structure of the intersection of the optical fiber wiring board according to the third embodiment. ⁇ FIG. 7 (a) is taken along the line X—X, FIG. 7 (b) or FIG. 7 (c).
  • FIG. 8 is a perspective view schematically showing the structure of the optical fiber wiring board according to the third embodiment.
  • FIG. 9A is a schematic top view of the optical fiber wiring board according to the third embodiment.
  • FIG. 9B is a schematic diagram of the structure of the intersection of the optical fiber wiring board according to the third embodiment.
  • FIG. 10 is a schematic top view of a sub wiring board 400 of the optical fiber wiring board according to the third embodiment.
  • FIG. 11 is a schematic top view of a sub wiring board 500 of the optical fiber wiring board according to the third embodiment.
  • FIG. 12 is a schematic top view of a sub wiring board 600 of the optical fiber wiring board according to the third embodiment.
  • FIG. 13 is a schematic diagram of a structure of an intersection of the optical fiber wiring board according to the fourth embodiment.
  • Fig. 13 (a) is a perspective view
  • Fig. 13 (b) is a cross-sectional view taken along the line XX of (a).
  • FIG. 14 (a) is a process plan view for explaining the method for manufacturing an optical fiber wiring board according to the fourth embodiment
  • FIG. 14 (b) is a process along the line XX of (a). It is a sectional view.
  • FIG. 15A is a process plan view for explaining the method for manufacturing an optical fiber wiring board according to the fourth embodiment
  • FIG. 15B is a sectional view taken along line X--X in FIG. It is a process sectional view.
  • FIG. 16A illustrates a method for manufacturing an optical fiber wiring board according to the fourth embodiment.
  • FIG. 16 (b) is a cross-sectional view of the process along the line XX of (a).
  • FIG. 17 (a) is a process plan view for explaining the method for manufacturing an optical fiber wiring board according to the fourth embodiment
  • FIG. 17 (b) is a sectional view taken along line XX of (a).
  • FIG. 18 is a plan view schematically showing a wiring sheet structure having a plurality of optical fiber cores.
  • FIG. 19 is a plan view schematically showing a wiring sheet structure having multi-core optical fibers with connectors attached to both ends.
  • FIG. 20 is a graph showing the skew characteristics with respect to the port number of the optical fiber.
  • FIG. 21 is a diagram showing the structure of the intersection of the optical fiber wiring board.
  • FIG. 22 (a) is a perspective view schematically showing the structure of the intersection of the optical fiber wiring board
  • FIG. 22 (b) is a cross-sectional view taken along line XX of (a).
  • the optical path length can be controlled by irradiating the core of the optical fiber core with light and causing a light-induced refractive index change in the core, thereby adjusting the skew.
  • the present invention has been reached.
  • the optical path length (nL) of an optical fiber is the product of the refractive index (n) of the core and the optical fiber length (L). Therefore, the optical path length is proportional to the refractive index (n) of the core. Become longer.
  • the optical fiber 10 is composed of a core 11, a clad 12 formed around the core 11, and a coating layer 14 covering the outer surface of the clad 3.
  • the portion composed of the core 11 and the clad 12 is referred to as an optical fiber 13.
  • a region ′ having a length ′ (light-induced refractive index change region) 21 in which the refractive index is selectively changed by the light-induced refractive index change is formed in a part of the core 11, a region ′ having a length ′ (light-induced refractive index change region) 21 in which the refractive index is selectively changed by the light-induced refractive index change is formed.
  • the region 21 is formed, for example, by irradiating the core 11 with ultraviolet rays.
  • the optical path length of the optical fiber 10 is controlled within a set value by the refractive index and the length L ′ of the formed region 21. That is, by changing one or both of the refractive index and the length L of the region 21, the optical path length of
  • FIG. 2 shows the refractive index of the region 21. From FIG. 2, it can be seen that the region 21 has a higher refractive index (1.545) than the refractive index of other core portions (1.440).
  • the optical fiber length L is, for example, 25 Omm
  • the optical path length of the optical fiber core having the region 21 having a length ′ of 100 mm is 385.5 mm from the following equation (I).
  • the optical path length of the optical fiber without area 21 is 1.540 (of the core length L) to 250 mm (optical fiber length L). Since this is 385.0 mm multiplied by the refractive index), it can be seen that the formation of the region 21 has increased the optical path length of the optical fiber from 385.0 mm to 385.5 mm.
  • Figure 3 shows the relationship between skew characteristics and UV irradiation energy density.
  • the vertical axis in FIG. 3 represents the variation [ps] of the skew characteristic, and the horizontal axis represents the ultraviolet irradiation energy density [J / cm 2 ] for irradiating the optical fiber. From Fig. 3, it can be seen that there is a constant relationship (almost proportional relationship) between the amount of change in the skew characteristic and the energy density of ultraviolet irradiation. Therefore, the skew characteristics can be adjusted accurately by controlling the ultraviolet irradiation energy.
  • the skew characteristics can be adjusted to about m.
  • the ultraviolet wavelength applied to the optical fiber is 266 nm, which is the fourth harmonic (4 ⁇ ) of the Nd-YAG laser.
  • the movable mirror is moved to irradiate the section of 100 mm in the fiber length direction.
  • Ultraviolet light with a maximum average power of 10 mW and operable at 10 Hz with a pulse width of 50 ns was used.
  • the average beam size was 2 mm in the fiber axis direction.
  • the optical fiber from which the coating layer 14 was removed was irradiated with ultraviolet rays.
  • the optical fiber core was subjected to a high-pressure hydrogen treatment of 20 MPa at room temperature for 2 weeks.
  • the optical fiber core 10 in the present embodiment in addition to Ge having the same concentration as that of the normal specification optical fiber, Sn, or 311 and 811, 311 and 8, or Sn, A1 and B are used. It is preferable to use a material to which one punt is added in order to constantly increase the photoinduced refractive index change.
  • the optical fiber of the normal specification is an optical fiber core to be connected to the optical fiber core 1 described above, and such an optical fiber is a relative refractive index relative to its core. It is manufactured by doping with Ge in such an amount that the difference becomes 0.9%.
  • the core 11 of the optical fiber core 10 has the same amount of Ge as the core of the optical fiber of the normal specification described above (an amount such that the relative refractive index difference is 0.9%), It is sufficient to co-dope Sn at a concentration of 10000 ppm or more, preferably 10000 to 15000 ppm, or Sn at such a concentration and A1 at a concentration of 1 000 ppm or less.
  • Sn with a concentration of 15000 ppm and 181 with a concentration of 900111 were co-doped.
  • De one up above SL may be carried out by various known methods, for example, when carried out by immersion, the compound of the S n (for example S n C 1 2 ⁇ 2 H 2 0) was mixed with methyl alcohol However, it may be immersed in the solution.
  • the compound of the S n for example S n C 1 2 ⁇ 2 H 2 0
  • the coating layer 14 for covering the optical fiber 13 is formed by a single coat following the above-described step of drawing the optical fiber 13.
  • the material for forming the coating layer 14 and the thickness of the coating layer 14 may be appropriately determined according to the required conditions. For example, the modulus of elasticity of the optical fiber 13 (Young's modulus E), the coefficient of thermal expansion (coefficient of linear thermal expansion), the temperature coefficient of refractive index (thermo-optic coefficient), and the It is preferable to determine based on the thermal expansion coefficient (linear thermal expansion coefficient) and the like. Further, as a material for forming the coating layer 14, it is preferable to use an ultraviolet-curable resin having a property of transmitting ultraviolet light.
  • the coating layer 14 is formed using an ultraviolet-transmissive ultraviolet-curing resin, ultraviolet irradiation can be performed without removing the coating layer 14. be able to.
  • the UV-transmitting UV-curable resin has at least a specific wavelength band (for example, a wavelength band of 240 nm to 270 nm) of ultraviolet light applied to form the light-induced refractive index change region 21. It is particularly preferable to transmit ultraviolet rays in the above-mentioned specific wavelength band, while hardly absorbing the ultraviolet rays, and to absorb ultraviolet rays having a shorter or longer wavelength than the above-mentioned specific wavelength band to cause a curing reaction. What is made to be used may be used.
  • the UV absorption characteristics vary depending on the wavelength
  • the coating layer 1 is made of a resin that is UV-transmissive in the specific wavelength band, but is UV-curable in the shorter or longer wavelength range than the specific wavelength band. Most preferably, 4.
  • resins include, for example, a polyurethane-based acrylate or an epoxy-based acrylate, which initiates and accelerates the curing reaction by receiving ultraviolet rays in a wavelength range shorter than 240 nm or a wavelength range longer than 270 nm.
  • a compound containing a photoinitiator photo-initiator
  • Table 1 below shows a preferred example of the parameters of the optical fiber 10 according to the present embodiment.
  • the “secondary coating diameter” in the table means the diameter of the optical fiber core 10 including the coating layer 14.
  • the optical fiber core 10 according to the present embodiment is a region where the refractive index is selectively changed. 2 1, whereby the optical path length of the optical fiber is controlled within a set value.
  • FIG. 4 is a flowchart showing each step of the method for manufacturing the optical fiber core 10.
  • an optical fiber core having a core 11 that causes a light-induced refractive index change by light irradiation and a clad 12 surrounding the core 11 is prepared (step S 1).
  • the core of the prepared optical fiber core 11 has, for the purpose of steadily increasing the light-induced refractive index change, in addition to the same concentration of Ge as that of a normal specification optical fiber, for example, Sn and A1, etc. Preferably, they are co-doped at a concentration of
  • the prepared optical fiber core wire is placed in a sealed container filled with hydrogen, and left at room temperature under a pressure of about 20 MPa for approximately two weeks.
  • the optical path length of the prepared optical fiber core is measured (step S 2).
  • the measurement of the optical path length may be performed according to a known method.
  • the optical path length can be measured by 0 ptical Low-Coherence Reflectometry manufactured by Ando Electric (AQ740).
  • the refractive index is changed by selectively irradiating a part of the core 11 with ultraviolet rays so that the optical path length measured in the step S2 coincides with the set value, thereby changing the refractive index.
  • the refractive index changing region 21 is formed (step S3).
  • the set value is determined based on the given specifications.
  • the UV irradiation area (or the length L 'of the area 14) and the UV irradiation energy density (or UV irradiation time) are determined so that the optical path length of the optical fiber matches the set value.
  • the core 11 is irradiated with ultraviolet light (for example, 266 nm) from above the coating layer 14.
  • the photo-induced refractive index change region 21 can be formed.
  • ultraviolet irradiation is performed. Should be performed. It is also possible to adopt a method of forming the coating layer 14 after performing the step S3 on the optical fiber strand 13.
  • an optical fiber core 10 having an optical path length matched with the set value can be obtained.
  • the location where the region 21 is formed is not particularly limited. It may be formed at the end of the optical fiber core wire 10 or at the center. Further, a plurality of regions 21 may be formed.
  • the optical path length of the optical fiber core wire can be adjusted by controlling the region to be irradiated with ultraviolet light and the ultraviolet irradiation energy density, the optical path length can be adjusted with higher accuracy than before by a simple process. It is possible to provide an optical fiber core controlled within a set value. Therefore, when a large number of optical fiber cores are manufactured, the manufacturing cost can be reduced.
  • FIG. 5 schematically shows an optical fiber assembly 200 according to the present embodiment.
  • the optical fiber assembly 200 shown in FIG. 5 is a three-core wiring sheet having four multi-core optical fibers 30 including eight optical fiber cores 10 on a sheet substrate 20. It is a structure. 3 At least one core 11 of the two optical fiber cores 10 has a region in which the refractive index is selectively changed by a light-induced refractive index change. The variation in the optical path length of each of the two optical fiber cores is controlled within the set value. That is, at least one of the 32 optical fiber cores 1 ° shown in FIG. 5 is the optical fiber core 10 of the first embodiment shown in FIG. The variation of the optical path length of each of the 32 optical fibers is controlled within a set value by the photoinduced refractive index change region 21 included in the core.
  • the contents of the optical fiber core 10 of the first embodiment are omitted for the sake of simplicity of description, and the following mainly describes differences from the first embodiment.
  • a multi-core connector 40 (international standard IEC61754-5: typ e MT connector) is attached, and at the other end, a single-core connector 50 (international standard IEC61754-6: type MU connector) is attached.
  • 3 2 optical fibers The standard wiring length between the connectors at both ends of the Aiva core wire 10 is, for example, 500 mm.
  • the sheet substrate 20 supporting the multi-core optical fiber 30 is made of, for example, PET material (thickness:
  • the multi-core optical fiber 30 and the sheet substrate 20 are adhered to each other using a silicone-based adhesive, and the adhesive surface is made of, for example, a fluororesin (thickness: 50 / m). j) is laminated.
  • FIG. 4 is a flowchart showing each step of the method for manufacturing the optical fiber core wire 10.
  • a plurality of optical fiber core wires 10 having a core 11 that causes a light-induced refractive index change by light irradiation and a clad 12 surrounding the core 11 are prepared (step S11).
  • four multi-core optical fibers 30 are prepared.
  • Each core 11 of the optical fiber core 10 has, for the purpose of steadily increasing the light-induced refractive index change, in addition to the same concentration of Ge as a normal specification optical fiber, for example, Sn and A 1 Are preferably co-doped at a predetermined concentration.
  • an optical fiber core wire 10 having a coating layer 14 formed of an ultraviolet transmission type ultraviolet curable resin is prepared.
  • a connector is attached to at least one end of each of the optical fiber cores 10 (step S12).
  • a multi-core connector 40 for example, international standard IEC61754-5: type MT connector
  • a single end is disassembled to that of the optical fiber core 10.
  • Attach the core connector 50 for example, international standard IEC617 54-6: type MU connector.
  • the multi-core optical fiber 30 is connected to the multi-core optical fiber 30.
  • the substrate 20 is bonded with a silicone-based adhesive, and then the bonding surface is laminated with, for example, a fluororesin (thickness: 50 ⁇ m).
  • a fluororesin thickness: 50 ⁇ m
  • Connectors 40 and 50 may be attached to 30.
  • optical path length of each of the optical fibers 10 is measured (step S13).
  • Optical fiber assembly 20 combining multi-core connector 40 and single-core connector 50 In the case of 0, since it is difficult to perform accurate positioning, the optical path length of each of the optical fibers 10 often varies.
  • the measurement of the optical path length may be performed according to a known technique. For example, an optical path length measurement can be performed by Optical Low-Coherence Reflectometry manufactured by Ando Electric (AQ740).
  • a photoinduced refractive index change region 21 is formed in the core 11 so that each of the optical path lengths measured in the step S13 falls within the range of the set value (step S14). That is, the core 11 of at least one of the two optical fiber cores 10 is set so that each of the plurality of optical path lengths falls within the set value range.
  • the refractive index is changed by selectively irradiating an ultraviolet ray to a part of the region. Specifically, the following may be performed.
  • an optical fiber core wire 10 not included in the range of the set value is selected from the reference.
  • the setting value may be determined based on the given specifications.
  • the region to be irradiated with ultraviolet light (or the length L of the region 14) is set so that the optical path length is within the range of the set value from the reference.
  • the optical fiber core 10 may be formed at a location where the optical fiber core 10 is multi-core-shaped, or may be formed at a location where the optical fiber core 10 is decomposed therefrom.
  • the optical fiber assembly 200 in which all the optical path lengths of the plurality of optical fiber cores 10 are within the set value range.
  • ultraviolet rays can be irradiated from above the coating layer 14. After removing the coating layer 14 in the region to be irradiated with ultraviolet rays, ultraviolet irradiation may be performed.
  • the step S12 for attaching the connector is performed. May be performed.
  • the multi-core optical fiber 30 is used.
  • a core structure such as a tube structure (for example, a loose tube) may be used.
  • At least one core 11 out of the plurality of optical fiber cores 10 has a region 2 1 in which the refractive index is selectively changed by the light-induced refractive index change. Accordingly, the dispersion of the optical path lengths of the plurality of optical fiber cores is controlled within a set value. For this reason, when attaching a connector to an optical fiber core, it is possible to control the variation in the optical path length smaller than the variation in the optical path length determined by the connector mounting accuracy, and to provide an optical fiber assembly with extremely low skew. can do. Further, according to the manufacturing method of the present embodiment, even after the connector is attached, the optical path length of the optical fiber core can be controlled by a simple process, thereby improving the yield of the optical fiber assembly. As a result, manufacturing costs can be reduced.
  • optical fiber core wire 100 of the first embodiment with the optical fiber assembly 200 of the second embodiment. That is, after preparing a plurality of optical fiber cores 10 of Embodiment 1 in which the optical path length is controlled within a set value with higher accuracy than before, a connector is attached to each optical fiber core 10, and then, An optical fiber assembly in which a region is formed in at least one core of the plurality of optical fibers, and a variation in optical path length of each of the plurality of optical fibers is controlled within a set value. It is also possible to produce 00.
  • FIG. 7 schematically shows the structure of the intersection of the optical fiber wiring board according to the present embodiment.
  • FIG. 7A corresponds to a cross-sectional view taken along line XX of FIG. 7B or FIG. 7C.
  • the optical fiber wiring board 100 of the present embodiment has a substrate 110 having a main surface 111, an adhesive layer 120 formed on the main surface 111, and an adhesive layer 120 on the adhesive layer 120. It has a plurality of optical fibers 130 arranged.
  • Each of the plurality of optical fibers 130 is wired so as to have a bent portion and a straight portion in a plane parallel to the main surface 111.
  • Two optical fibers 130a and 130b of the plurality of optical fibers 130 cross each other to form an intersection.
  • the lower optical fiber 130a at the intersection is bonded to the adhesive layer 120, and the upper optical fiber 130a contacts the lower optical fiber 130b (contact point 1333).
  • the height of the intersection (the height from the adhesive layer 120 in the direction perpendicular to the substrate 110) is the diameter of the two optical fibers 130a and 130b that intersect each other.
  • c optical fiber which can suppress and prevent the occurrence of flexure in the optical fiber at the intersection, has a pattern composed of a combination of a straight portion and a bent portion.
  • the intersection of the optical fiber wiring board is such that the straight section of the upper optical fiber 130a passes over the lower optical fiber 130b. It is preferable to form them. In other words, by laying so that a bent portion that is easily deformed or moved by an external force is not disposed above the intersection, the occurrence of deflection at the intersection is more effectively suppressed and prevented. Is done.
  • the bent portion of the optical fiber 130 is bonded to the adhesive layer 120, and it is more preferable that all regions of the bent portion are bonded to the adhesive layer 120. Of course, it is preferable that all of the linear portions located in the lower layer are bonded to the adhesive layer 120.c
  • the bent portion of the optical fiber 130 is laid while being bonded on the adhesive layer 120, and laid. It is possible to maintain the shape when it is performed.
  • the shape of the bent portion is preferably an arc shape as shown in FIG. 7 (c).
  • the upper optical fiber 130b is disposed so as to surmount the lower optical fiber 130a with a predetermined radius of curvature Ra.
  • the radius of curvature R a is set, for example, to be a radius of curvature larger than the minimum radius of curvature R min that can withstand stress continuously over the period in which the optical fiber is used. Since Ra depends on the arrangement of two intersecting optical fibers 130, there is no particular upper limit. However, as the radius of curvature Ra increases, the portion of the upper optical fiber 130b that is not bonded to the adhesive layer 120 increases, so that the radius of curvature Ra may not be much larger than the minimum radius of curvature Rmin. preferable.
  • the two optical fibers 130 By arranging the two optical fibers 130 so as to be orthogonal to each other, it is possible to reduce Ra.
  • the two optical fibers 130 In order to securely fix the upper optical fiber 130b, the two optical fibers 130 should be almost orthogonal, and Ra should be within the range of R min ⁇ R a ⁇ 2 x R min. Preferred.
  • a laminate layer (not shown) may be provided so as to cover the plurality of optical fibers 130 arranged as described above.
  • the optical fiber 130 can be fixed more mechanically and stably, and the optical fiber 130 can be protected from the external environment.
  • the laminate layer can be formed using a known material. For example, a filler / film material disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-109333 can be used.
  • the above optical fiber wiring board can be manufactured as follows. Steps other than the optical fiber laying step can be performed by a known method, and thus description thereof will be omitted, and a method of laying an optical fiber will be described. Prior to the installation process described below, the wiring pattern has already been designed.
  • the wiring pattern can be designed by a known method so that the arrangement relationship between the lower optical fiber and the upper optical fiber is not inconsistent with the above-mentioned conditions and that the wiring is performed in a one-stroke manner.
  • the plurality of optical fibers 130 are laid in a predetermined pattern (a combination of straight lines and curves) while being pressed and bonded to the adhesive layer 120 with a predetermined amount of force one by one.
  • the optical fiber 130b is laid to the bonding point 134 in FIG.
  • the optical fiber 130b is laid while adhering to the adhesive layer 120 as before.
  • the upper optical fiber 130b has its elastic force.
  • a force for holding down the lower optical fiber 130a acts, so that the upper optical fiber 130a is stably fixed without bending.
  • the occurrence of optical fiber bending at the intersection is suppressed and prevented, so that the actual required wiring length can be accurately calculated, and the designed length is achieved. Can lay an optical fiber.
  • the length of each optical fiber actually laid can be made to match the design value with high accuracy, so that, for example, an optical fiber wiring board used in an optical communication system or the like can be used for optical signal transmission. It is suitably used for applications where it is necessary to reduce variations in transmission delay. That is, according to the present invention, it is possible to obtain an optical fiber wiring board in which the lengths of a plurality of optical fibers match each other with high precision. More strictly, it is preferable to determine the length of each optical fiber in consideration of the refractive index difference between the optical fibers.
  • an optical matrix conversion wiring board is composed of m ports (p0 rt) and n channel (ch) inputs (denoted as “(m, n) inputs”).
  • n channel (ch) inputs denoted as “(m, n) inputs”.
  • FIG. 8 shows an optical matrix conversion wiring board 200 of the present embodiment.
  • the optical matrix conversion wiring board 200 has sub wiring boards (optical fiber wiring boards) 300, 400, 500, and 600 each having 64 optical fibers.
  • the 16 input terminals and the 16 output terminals are connected to each other by pulling out the optical connector 35 2 or 36 2 provided on each sub-board 300-600 as a pair. They are arranged in a line at regular intervals along the opposing sides.
  • the input terminals are ch 1 to 16 in order from one end, and the output terminals are ch I to XVI in order from one end so as to correspond to each of the input terminals.
  • the (I to VIII, 1 to 8) input and the (1 to 8, I to VIII) output are connected by the sub wiring board 300, and the (I to VIII, 9 to 16) input and (9 ⁇ : I 6, I to VIII) output is connected, sub wiring board 500 connects (IX to XVI, 1 to 8) input and (1 to 8, IX to XV I) output, and sub wiring board At 600, the (IX to XVI, 9 to 16) input is connected to the (9 to: 16; IX to XVI) output.
  • the input (I to XVI, 1 to 16) is given to the optical connector 352 of the sub-wiring board 300, 400, 500 or 600 via the input terminal, and the sub-wiring board 300, 400, or Outputs (1 to: L6, I to XVI) can be obtained from the optical connectors 362 of 500 and 600.
  • the sub-wiring boards 400, 500 and 600 are manufactured by the same wiring method as that of the sub-wiring board 300, though the wiring patterns of the optical fibers are different from each other.
  • the structure and wiring method of the sub wiring board 300 will be described as an example with reference to FIGS. 9A and 9B.
  • the plan configurations of the sub-wiring boards 400, 500 and 600 are shown in FIG. 10, FIG. 11 and FIG. 12, respectively.
  • the sub wiring board 300 includes a substrate 310, an adhesive layer 320 formed on the main surface 311 of the substrate 310, and 64 optical fibers 330 disposed on the adhesive layer 320. I do. Optical fiber 330, c via the adhesive layer 320 is fixed to the substrate 3 1 0
  • the 64 optical fibers 330 are combined into eight optical fiber bundles 35 1 and 36 1 on the input side and the output side, respectively.
  • the optical fiber bundles 35 1 and 36 1 are separated into individual optical fibers 330 near the intersection on the substrate.
  • Each of the input-side optical fiber bundles 35 1 corresponding to chl to 8 having ports I to VIII is reconfigured on the sub-wiring board 300 into the ch having portl to 8]: to VIII output-side optical fiber bundles 36 1 .
  • eight (chort 1 to 8) optical fibers 330 of ch1 on the input side are respectively included in chort to vi1 of chI to VIII on the output side.
  • the sub-wiring board 300 has a number of intersections where two optical fibers 330 intersect each other.
  • the lower optical fiber 330 at the intersection is bonded to the adhesive layer 320, and the upper optical fiber 330 is arranged so as to contact the lower optical fiber 330. That is, the height of the intersection (the height from the adhesive layer 320 in a direction perpendicular to the substrate 310) is the sum of the diameters of the two optical fibers 330 that intersect each other. As a result, bending of the optical fiber at the intersection is suppressed and prevented.
  • the optical fiber 330 is wired by combining a straight line portion and an arc portion at eight points.
  • the straight part is only a parallel line in the X and Y directions, and the arc part at eight places (radius of curvature R1, R2, R3, R4, R5, R6 , R 7 and R 8) are each a quarter of the circumference.
  • the arc portion is provided for equalizing the length of the optical fiber 330 and for controlling the position of the intersection.
  • the sum of the lengths of the straight sections of each optical fiber is equal to each other, and the circle of each optical fiber 330
  • the sum of the arc lengths is equal to each other. In this embodiment, as shown in FIG.
  • the radii of curvature Rl, R2, R7, and R8 of the arc portion are set to 15 mm
  • the wiring method will be described using eight optical fibers 330 of ch8 as an example with reference to FIG.
  • the eight optical fibers 330 of ch8 on the input side are pressed one by one against the adhesive layer with a predetermined amount of force, and are adhered to each other, and the linear part and the arc part of the radius of curvature R1 to R8 are joined. It is laid to form.
  • an arc portion having a radius of curvature R 5 is formed so that the eight optical fibers 3 30 are separated one by one from the optical fiber bundle 35 1 at regular intervals. .
  • These arc portions are all formed with the same radius of curvature R5.
  • the eight optical fibers 330 are arranged adjacent to each other so as to form a bundle (optical fiber bundle 351 or 361).
  • the optical fibers 330 from ch7 to ch1 are laid in the same manner so that the optical connectors 352 and 362 are arranged at the interval S.
  • the distance between the intersections in the X direction is set to be larger than the radius of curvature of the arc so that the arc does not overlap with other arcs .
  • This wiring step of the optical fiber 330 can be performed using, for example, an XY probe.
  • the lower optical fiber 330a at the intersection 313 is formed by the intersection of the upper optical fiber 330b passing over adjacent (five) lower fibers parallel to each other. Including part. In the vicinity, an intersection is formed in which the upper optical fiber 330a crosses the other two lower optical fibers 330b. Between these intersections (between the lower optical fibers 330), the upper optical fiber 330a is once adhered to the adhesive layer 320.
  • the upper optical fiber 330a is bonded to the bonding layer 320. This allows for The bending of the upper optical fiber 330a is prevented. It is preferable that the number of the lower optical fibers 330b over which the upper optical fiber 330a simultaneously rides is small, but it is sufficient if it is within a range where the optical fibers can be fixed stably and without bending.
  • a wiring tolerance occurs. The wiring tolerance is a deviation between the design and the actual state when, for example, two optical fibers are arranged on a plane so as to be adjacent to each other.
  • the last eight optical fibers of ch1 will be wired.
  • the wiring interval may be insufficient.
  • the straight portions 365 of the adjacent 64 optical fibers laid in parallel are provided with an interval between the optical fiber bundles 361 (eight).
  • the optical fibers 330 used in the present embodiment have a total wiring tolerance of 0.5 mm when arranged in a plane of 64 fibers. In consideration of the wiring tolerance and the diameter of the optical fiber, the interval between the optical fiber bundles 361 in the straight portion of the optical fiber is appropriately adjusted. With this, all of the sixty-four optical fibers 330 can be wired on the substrate 310.
  • the sub-wiring boards 400, 500, and 600 shown in FIGS. 10, 11, and 12 are manufactured in the same manner as the above-described sub-wiring board 300, except for optical fiber routing. .
  • the optical matrix conversion wiring board 200 is obtained by superposing the sub wiring boards 300, 400, 500, and 600 obtained as described above on each other as shown in FIG.
  • the four sub-wiring boards 300 to 600 may be laminated and integrated by bonding with an adhesive, or may be laminated and integrated by separately providing a member to be overlapped and fixed.
  • Each of the four sub-wiring boards has a uniform height equivalent to two optical fibers and is stably bonded to each other.
  • the following are used as the substrate 310, the adhesive layer 320, and the optical fiber 330 used in the sub wiring board 300 of the present embodiment.
  • the substrate 310 a rigid substrate that is strong against vibration is used so that the optical fibers 330 are hardly bent after the sixty-four optical fibers 330 are wired.
  • a material for forming the substrate 310 polyimide resin, polyethylene terephthalate resin, polyethylene naphtholate resin, or the like can be used.
  • a film obtained by bonding a film and a rigid substrate may be used. ⁇ At this time, the optical fiber 330 is wired on the film, and the film is fixed on the rigid substrate. It is produced by As the material for forming the film, polyimide resin, polyethylene terephthalate resin, polyethylene naphthate resin, or the like can be used.
  • the adhesive layer 320 is a layer having adhesiveness or adhesiveness, and can be formed using a known adhesive or adhesive (for example, a silicone adhesive). Any material that can securely fix the optical fiber may be used.
  • the optical fiber 330 wired on the substrate 310 via the adhesive layer 320 may be reinforced with a laminate layer (not shown) in order to further improve mechanical stability. In this way, it is possible to protect against external stress and external humidity, and to improve the stability of the wiring and improve the reliability.
  • a laminate layer (not shown)
  • Polytetrafluoroethylene (PTFE) or the like can be used as the laminate layer.
  • a known single-core optical fiber is used as the optical fiber 330, and may be coated with a glass core wire or uncoated.
  • coated optical fibers are preferred because they do not easily damage the glass core wire, are easy to handle at the time of wiring, and have high strength against friction generated when the wires are sent out by a machine using a machine. If a coated optical fiber is used, sufficient reliability can be obtained even if the laminate layer is omitted or only a thin laminate layer is provided.
  • Known multi-core optical fibers for example, fiber ribbons are used for the optical fiber bundles 35 1 and 36 1.
  • an 8-core MT connector is used for the optical connectors 352 and 362, but there is no particular limitation as long as it is a known multi-core optical connector.
  • the distance (S) between the optical connectors 352 and 362 shown in FIG. 9A is 8.5 mm.
  • the area of the substrate and the optical fiber bundle 351 And set freely according to the width of 361.
  • a multi-layered structure using a plurality of B4 size sub-wiring boards is used.
  • An optical fiber wiring board was constructed.
  • the size of the substrate is set appropriately according to the application.
  • the number of intersections (density) that can be formed on one substrate is set in consideration of the substrate area and the length and thickness of the optical fiber.
  • the size of the substrate 310 is (substrate 3 ⁇ (Length of center intersection (Rmin (15 mm)) x number of optical fiber bundles (8 bundles) + optical fiber bundle width (0.25 mm x 8) x number of optical fiber bundles ( 8 bundles)) + (Length of folded part (connector spacing S (8.5 mm) x number of optical fiber bundles (8 bundles) ⁇ reciprocating (2) + optical fiber bundle width
  • the optical matrix conversion wiring board 200 of the present embodiment since the occurrence of the bending of the optical fiber at the intersection is suppressed and prevented, the lengths of the plurality of optical fibers 330 coincide with each other with high precision. I have. That is, it is possible to accurately estimate the length of the optical fiber required to cross the two fibers with each other, and that each optical fiber has the designed length. was gotten.
  • the optical matrix conversion wiring board 200 can be suitably used for applications where it is necessary to reduce variations in transmission delay of optical signals.
  • optical fiber wiring board 100 and the optical matrix conversion wiring board 2 are identical to The optical fiber wiring board 100 and the optical matrix conversion wiring board 2
  • At least one of the plurality of optical fibers included in the optical fiber 100 may be the optical fiber core 10 of the above embodiment. That is, by using the optical fiber core wire 10 of the first embodiment in which the optical path length is controlled within the set value with higher accuracy than before, the effects of the present embodiment and the effects of the first embodiment are both exhibited. It is also possible to realize an optical fiber wiring board 100 and an optical matrix conversion wiring board 200. Specifically, at least one core of a plurality of optical fiber cores has a region 2
  • the lower optical fiber is bonded to the adhesive layer at the intersection thereof, and the upper optical fiber is in contact with the lower optical fiber. That is, at the intersection, there are no gaps between the adhesive layer and the lower optical fiber, and between the lower optical fiber and the upper optical fiber, and the height of the intersection is the height of two optical fibers. Since they are arranged not to exceed, it is possible to suppress and prevent the occurrence of bending of the optical fiber at the intersection. In addition, since the occurrence of the bending of the optical fiber at the intersection can be suppressed and prevented, the lengths of the plurality of optical fibers can be matched with each other with high accuracy.
  • the optical fibers can be more securely fixed and the optical fibers can be protected.
  • the bent portion of the optical fiber is bonded to the adhesive layer, so that the bent portion is fixed in the shape as laid. can do.
  • the bend that is easily deformed or moved by external force will be located above the intersection. There is no. Therefore, it is possible to more effectively suppress and prevent the occurrence of bending at the intersection.
  • the shape of the bent portion is an arc
  • the total length of the optical fiber required for wiring can be easily estimated.
  • the arc is part of the circumference (typically a quarter)
  • the bent portion is formed by a quarter circle (90-degree arc)
  • the wiring direction is easily changed because the extending direction of the optical fiber (the direction of the fiber axis) changes by 90 degrees for each bent portion. Can be designed.
  • the upper optical fiber can be arranged so as to surmount the lower optical fiber with a predetermined radius of curvature in a plane perpendicular to the substrate.
  • the radius of curvature of each of the bends formed by the two points where the upper optical fiber is bonded to the adhesive layer on both sides of the contact point is, for example, a predetermined radius larger than the minimum radius of curvature that can withstand long-term reliability.
  • the radius of curvature can be set, and as a result, an optical fiber wiring board having excellent long-term reliability can be obtained.
  • FIG. 13 schematically shows a structure of an intersection of an optical fiber wiring board according to the present embodiment.
  • Fig. 13 (b) corresponds to the cross-sectional view along the line XX in Fig. 13 (a).
  • FIG. 13 schematically shows the structure of the intersection of the optical fiber wiring board of the present embodiment.
  • the optical fiber wiring board shown in FIG. 13 includes a substrate 2, an adhesive layer (including an adhesive layer) 3 formed on the substrate 2 and having a thickness approximately equal to the diameter of the optical fiber, and a plurality of optical fibers. Fiber 1.
  • Each of the plurality of optical fibers 1 is wired so as to have a bent portion and a straight portion in a plane parallel to the substrate.
  • Two optical fibers 1a and 1b of the plurality of optical fibers intersect with each other to form an intersection.
  • the lower optical fiber 1 a at the intersection is embedded in the adhesive layer 3 and wired.
  • the upper optical fiber lb is wired so as to be in contact with the lower optical fiber la, and is also wired so as to be in contact with the adhesive layer 3. Therefore, at the intersection, the upper optical fiber lb gently climbs over the lower optical fiber 1a so that excessive bending is not applied.
  • the bending of the optical fiber and the side pressure on the lower optical fiber due to the upper optical fiber do not occur at the cross section, so that the loss increases and the optical fiber is deformed or deformed by external force. Movement can be suppressed, and as a result, deterioration of mechanical stability can be prevented.
  • an optical fiber wiring board using 16 optical fibers will be described as an example.
  • an optical fiber An adhesive layer 3 having a thickness corresponding to the diameter of the bus is provided.
  • the four optical fibers 1a are embedded while being pressed against the adhesive layer 3 with a predetermined amount of force. Wired along the pattern.
  • each optical fiber la is wired so as to be in contact with the substrate 2 in terms of mechanical stability and thinning of the wiring board, but is not limited to this. Note that the four optical fibers la are lower optical fibers.
  • the place where wiring is performed to the upper part of the adhesive layer is preferably a straight wiring part of an optical fiber.
  • the upper optical fiber 1b is brought into contact with the upper part of the lower optical fiber 1a, and thereafter, the upper optical fiber 1b is pressed against the adhesive layer 3 without being embedded.
  • the wiring is made on the upper surface of the adhesive layer 3, and the wiring is made in contact with each of the lower optical fibers la.
  • the four optical fibers lb become upper optical fibers.
  • optical fibers 1d are wired in the same manner as described above, and an optical fiber wiring board using 16 optical fibers is completed.
  • the optical fibers ld, lc, and 1b are the upper optical fibers
  • the optical fiber 1a is the lower optical fiber.
  • the optical fiber wiring board covered with the filler 4 is illustrated.
  • the substrate 2 of the optical fiber wiring board is made of a rigid substrate that is strong against vibration and is not easily distorted by stretching so that the optical fiber 1 does not bend or stretch after the optical fiber 1 is wired.
  • a polyimide resin, a polyethylene terephthalate resin, a polyethylene naphthalate resin, or the like can be used.
  • a substrate obtained by bonding a film and a rigid substrate may be used as the substrate 2.
  • the optical fins 1 are wired on a film, and are manufactured by fixing the film on a rigid substrate.
  • polyimide resin, polyethylene terephthalate resin, polyethylene naphthalate resin, or the like can be used as a material constituting the film.
  • the adhesive layer 3 can be formed using a known adhesive material (for example, a silicone polymer) and may be any as long as it can securely fix the optical fiber. Since the optical fiber wired on the substrate via the adhesive layer has poor mechanical stability as it is, it is preferable to further reinforce the upper part. Therefore, in the present embodiment, the configuration is such that the optical fiber on the substrate is covered with the filler. Further, it is preferable that the filler has excellent fluidity during filling, loses fluidity after filling, and does not apply stress due to curing to the optical fiber. For example, a silicone polymer or an acryl amide gel can be used.
  • a silicone polymer or an acryl amide gel can be used.
  • the optical fiber 1 wired on the substrate 2 may be reinforced with a laminate layer (not shown) in order to improve the mechanical stability. By doing so, it is possible to protect against external stress and external humidity, and as a result, it is possible to improve the stability of the wiring and improve the reliability.
  • a laminate layer polytetrafluoroethylene (PTFE) or the like can be used.
  • the optical fiber 1 is a single-core optical fiber having a core and a cladding, and may be coated with a glass core wire or may be uncoated glass core.
  • the wire has the advantage that it can be designed thin because the thickness of the coating is eliminated.
  • the coated optical fiber scratches the glass core wire. This has the advantage of being difficult to enter, easy to handle at the time of wiring, and having high strength against friction generated at the time of sending out by the machine with the wiring using the machine.
  • the optical fiber 10 of the above embodiment can be used as the optical fiber 1. That is, by using the optical fiber core 10 of the first embodiment in which the optical path length is controlled within the set value with higher accuracy than before, the effects of the present embodiment and the effects of the first embodiment are both achieved.
  • An optical fiber wiring board that plays back can be realized. Specifically, a region 21 is formed in at least one core of the plurality of optical fiber cores (1a to 1c), and the variation in the optical path length of each of the plurality of optical fiber cores is set. It is possible to realize the optical fiber wiring board of the present embodiment that is controlled within the value.
  • the configuration of the present embodiment and the configuration of the third embodiment can be combined. That is, for example, in the configuration shown in FIG. 9B, it is also possible to adopt a configuration in which the adhesive layer 320 fills the gap between the upper optical fiber 330b and the substrate 310.
  • the lower optical fiber 330b is embedded in the adhesive layer 320, and the upper optical fiber 330b is connected to the lower optical fiber 330b and A configuration in which the adhesive layer 320 is arranged in contact with the adhesive layer 320 can be employed.
  • a filling layer and a laminate layer may be further provided.
  • the adhesive layer 3 does not need to be provided uniformly on the substrate 2, but may be provided only at an appropriate place where the optical fiber is wired.
  • the filler 4 does not need to be provided on the entire upper portion of the substrate 2 and the adhesive layer 3, but may be provided only in a place where the optical fiber is protected.
  • one of the two optical fibers that intersect with each other is disposed so as to be embedded in the adhesive layer at the intersection thereof, and the other optical fiber is disposed.
  • a fiber is disposed in contact with one of the optical fibers and the adhesive layer. Therefore, it is possible to prevent the upper optical fiber from being excessively bent, thereby preventing the optical fiber from bending, thereby increasing transmission loss and increasing the probability of breakage. There is no danger.
  • the length of the lower optical fiber is not one but multiple In this case, it is useful because there is no floating compared to the conventional technology.
  • the present invention by controlling the optical path length to within a set value using a simple process, it is possible to provide an optical fiber core whose optical path length is adjusted with higher precision than before. Further, according to the present invention, a low skew optical fiber assembly in which a variation in the optical path length of each of a plurality of optical fiber cores is controlled within a set value is provided with a high yield using a simple process. be able to.
  • an optical fiber wiring board in which deformation and movement of an optical fiber due to an external force are suppressed or prevented.
  • a plurality of optical fibers are required at a plurality of intersections. This makes it possible to accurately estimate the length of the optical fiber required to cross two of the fibers. Therefore, it is possible to obtain an optical fiber wiring board in which each optical fiber has the designed length. As a result, it is possible to provide an optical fiber wiring board in which the lengths of a plurality of optical fibers match each other with high accuracy.

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Abstract

L'invention porte sur une fibre optique (10) gainée comprenant une âme (11) et une gaine (12). L'âme (11) possède une région (21) dont l'indice de réfraction varie sélectivement sous l'effet photoréfractif de sorte que la longueur du chemin optique soit régulée selon une valeur prédéterminée. La longueur du chemin optique de la fibre optique (10) gainée est régulée avec précision par l'indice de réfraction et la longueur (L') de la région (21), le temps de transmission pouvant être ainsi ajusté.
PCT/JP2000/008278 1999-11-24 2000-11-24 Fibre optique gainee, ensemble fibre optique, procedes de fabrication et substrat pur fibre optique WO2001038909A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP11/332237 1999-11-24
JP33223799A JP2001154039A (ja) 1999-11-24 1999-11-24 光ファイバ心線および光ファイバアセンブリ、ならびにこれらの製造方法
JP2000027013A JP3393101B2 (ja) 2000-02-04 2000-02-04 光ファイバ配線板
JP2000/27013 2000-02-04
JP2000/95017 2000-03-30
JP2000095017A JP2001281469A (ja) 2000-03-30 2000-03-30 光ファイバ配線板

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WO2001038909A1 true WO2001038909A1 (fr) 2001-05-31

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207006A (ja) * 1982-05-27 1983-12-02 Mitsubishi Electric Corp 光回路
JPS644801A (en) * 1987-06-29 1989-01-10 Japan Electronic Control Syst Malfunction preventing device for microcomputer for automobile
JPH04298702A (ja) * 1991-02-07 1992-10-22 Nippon Telegr & Teleph Corp <Ntt> 光回路及びその特性調節方法
JPH0519148A (ja) * 1991-07-16 1993-01-29 Hitachi Cable Ltd 光フアイバケーブル
US5263109A (en) * 1991-06-14 1993-11-16 Hitachi, Ltd. Optical transmission paths and methods of measuring their optical transmission times
JPH06308546A (ja) * 1993-04-20 1994-11-04 Nippon Telegr & Teleph Corp <Ntt> 光回路の特性調整方法
EP0665451A1 (fr) * 1993-12-30 1995-08-02 AT&T Corp. Guide d'ondes optique pour transformer le champ modal
JPH10126018A (ja) * 1996-10-17 1998-05-15 Advantest Corp 光・電気混在配線板及びその製造方法
JPH10282352A (ja) * 1997-04-09 1998-10-23 Nippon Telegr & Teleph Corp <Ntt> 光導波路の作製方法
JPH11202149A (ja) * 1998-01-19 1999-07-30 Tomoegawa Paper Co Ltd 光学接続部品およびその作製方法

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58207006A (ja) * 1982-05-27 1983-12-02 Mitsubishi Electric Corp 光回路
JPS644801A (en) * 1987-06-29 1989-01-10 Japan Electronic Control Syst Malfunction preventing device for microcomputer for automobile
JPH04298702A (ja) * 1991-02-07 1992-10-22 Nippon Telegr & Teleph Corp <Ntt> 光回路及びその特性調節方法
US5263109A (en) * 1991-06-14 1993-11-16 Hitachi, Ltd. Optical transmission paths and methods of measuring their optical transmission times
JPH0519148A (ja) * 1991-07-16 1993-01-29 Hitachi Cable Ltd 光フアイバケーブル
JPH06308546A (ja) * 1993-04-20 1994-11-04 Nippon Telegr & Teleph Corp <Ntt> 光回路の特性調整方法
EP0665451A1 (fr) * 1993-12-30 1995-08-02 AT&T Corp. Guide d'ondes optique pour transformer le champ modal
JPH10126018A (ja) * 1996-10-17 1998-05-15 Advantest Corp 光・電気混在配線板及びその製造方法
JPH10282352A (ja) * 1997-04-09 1998-10-23 Nippon Telegr & Teleph Corp <Ntt> 光導波路の作製方法
JPH11202149A (ja) * 1998-01-19 1999-07-30 Tomoegawa Paper Co Ltd 光学接続部品およびその作製方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HIBINO Y. ET AL.: "Optical frequency tuning by laser-irradiation in silica-based mach-zehnder-type multi/demultiplexers", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 3, no. 7, July 1991 (1991-07-01), pages 640 - 642, XP002936552 *

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