公开(公告)号：JPS5950403A

公开(公告)日：1984-03-23

申请号：JP16205382

申请日：1982-09-16

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  TSUKAMOTO MAKOTO ,  YUASA MITSUO

IPC: C03B37/01 ,  G02B6/028 ,  G02B6/036 ,  H01P3/20

CPC classification number: G02B6/03627 ,  G02B6/03605

Abstract: PURPOSE:To enable the formation of an optical fiber to a truly circular cross section by constituting the double clad layers consisting of the 1st and the 2nd clad layers to be constituted between a core layer and the outermost layer in such a way that the m.p. thereof is lower on the outermost layer side and is increasingly higher the nearer the boundary with the core layer. CONSTITUTION:A thick clad layer 42 which has a refractive index approximately equal to silica glass and is added with the impurity for decreasing the m.p. so as to be added increasingly less from the outer layer side toward the center and a core layer 41 having the higher refractive index are provided on the inside of the outermost layer 42 consisting of silica glass. Since the clad layer is thickly formed with such constitution, the diffusion of the OH group contained in a quartz tube used as a starting material into the core layer is prohibited and since the amt. of the B2O3 added in the clad layer is decreased toward the boundary with the core layer, the loss caused by the absorption of the transmitted light leaking from the core layer by B2O3 is reduced, and the single mode optical fiber of a low transmission loss having a truly circular sectional shape is obtd.

Abstract translation: 目的：通过构成由芯层和最外层之间构成的第一和第二覆盖层构成的双层包层，使光纤形成真正的圆形横截面，使得m.p。 其在最外层侧较低，并且越接近与芯层的边界越高。 构成：厚覆层42，其折射率近似等于二氧化硅玻璃，并加入杂质以降低m.p。 从外层侧越向中心越来越少，在由石英玻璃构成的最外层42的内侧设置有折射率较高的芯层41。 由于以这种结构厚地形成包覆层，因此禁止将用作原料的石英管中所含的OH基扩散到芯层中，因为amt。 包覆层中添加的B2O3的含量减少到与芯层的边界，由于通过B 2 O 3从芯层漏出的透射光的吸收所引起的损失减少，并且具有低传输损耗的单模光纤具有 实际上是圆形的截面形状。

公开(公告)号：JPS5935047A

公开(公告)日：1984-02-25

申请号：JP14645782

申请日：1982-08-23

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  YUASA MITSUO ,  TSUKAMOTO MAKOTO

IPC: C03C25/42 ,  C03B37/10 ,  G02B6/44

Abstract: PURPOSE: To coat the outer circumference of an optical fiber with a reinforcing metallic layer, uniformly and continuously, by contacting a spun optical fiber with metallic vapor in a metallic vapor pipe.
CONSTITUTION: A ring-shaped metal-melting crucible 21 having a hollow part at the center is integrated with a vertical pipe 22 for passing metallic vapor, and is placed in the path of the spun optical fiber 3. The crucible 21 is charged with a metallic coating material having relatively high vapor pressure, and an inert gas is introduced through the gas-feeding pipe 23 into the crucible 21 to keep the atmosphere in the crucible 21 to non-oxidative state. The coating material 24 is molten and evaporated by the first furnace 24, and the metallic vapor is filled in the pipe 22 heated by the second furnace 25. The optical fiber 3 is inserted into the pipe 22, brought into contact with the metallic vapor to deposite metallic layer on the surface, and pulled down through the hollow part of the crucible 21 to obtain an optical fiber 3' having uniformly applied metalic layer.
COPYRIGHT: (C)1984,JPO&Japio

Abstract translation: 目的：通过在金属蒸气管中使纺丝光纤与金属蒸气接触，以均匀连续的方式涂覆光纤的外周。 结构：在中心具有中空部分的环形金属熔化坩埚21与垂直管22一体化，用于使金属蒸汽通过，并被放置在纺丝光纤3的路径中。坩埚21装有 具有较高蒸气压的金属涂层材料和惰性气体通过供气管23被引入坩埚21，以使坩埚21中的气氛保持非氧化状态。 涂料24由第一炉24熔化并蒸发，金属蒸气填充在由第二炉25加热的管22中。光纤3插入管22中，与金属蒸气接触， 在金属表面上沉积金属层，并通过坩埚21的中空部分向下拉，得到均匀涂敷金属层的光纤3'。

公开(公告)号：JPS58211705A

公开(公告)日：1983-12-09

申请号：JP9577382

申请日：1982-06-03

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  TSUKAMOTO MAKOTO ,  YUASA MITSUO

IPC: C03C25/42 ,  G02B6/44

CPC classification number: G02B6/4402

Abstract: PURPOSE:To form a structure of a metal-coated optical fiber superior in characteristics of high temp. resistance and aging change resistance, by successively coating the outer circumference of the optical fiber with a low m.p. metallic layer and a high m.p. metallic layer. CONSTITUTION:The outer circumference of a spinned 125mum diameter quartz type optical fiber is continuously coated with molten zinc placed in a crucible to form an about 5mum thick layer 2 of lower m.p. Zn metal, and further coated with molten Al placed in a crucible heated at about 700 deg.C to form a 20mum thick layer 3 of higher m.p. Al metal. Since the coating speed of Al is about 20m/min, the surface of the Zn layer 2 somewhat melts but does not flow. Therefore, direct contact of Al with the fiber 1 is avoided. In this case, part of Zn and Al are converted into alloy, thus forming easily a light transmitting optical fiber having high temp. and aging change resistance characteristics sufficiently resistant to secondary treatment temps. at about 500 deg.C.

Abstract translation: 目的：形成高温特性优异的金属涂层光纤结构。 电阻和老化变化电阻，通过连续地以低的mp涂覆光纤的外周。 金属层和高m.p. 金属层。 构成：将直径为125μm的双螺旋石英型光纤的外周连续地涂敷在坩埚中的熔融锌，形成约5μm厚的下层m 2的层2。 Zn金属，并进一步用熔融的Al涂覆在加热到约700℃的坩埚中，以形成较高的m.p.2的20μm厚的层3。 铝金属 由于Al的涂布速度为约20m / min，Zn层2的表面有些熔化但不流动。 因此，避免了Al与纤维1的直接接触。 在这种情况下，Zn和Al的一部分转变为合金，因此容易形成具有高温的透光光纤。 以及耐二次处理温度的抗老化变化特性。 在约500℃

公开(公告)号：JPS58125629A

公开(公告)日：1983-07-26

申请号：JP718382

申请日：1982-01-19

Applicant: FUJITSU LTD

Inventor： TSUKAMOTO MAKOTO ,  YUASA MITSUO

IPC: C03B37/012 ,  C03B37/027 ,  G02B6/024

Abstract: PURPOSE:To obtain a polarization-maintaining optical fiber by the conventional optical fiber manufacture technique, easily, by cladding an optical guide consisting of a circular core and a clad with the secondary clad composed of two kinds of glass materials having different optical indices from each other. CONSTITUTION:The exactly circulator thin optical rod 4 obtained by drawing a preformed light guide composed of the core part 2 and the clad part 3 to a desired diameter, is positioned at the center of a support tube 1 made of quartz glass which becomes the outer protection layer. The circumference of the light guide is packed completely with a plurality of thin optical rods 7, 8 in such a manner that the optical rods 7 and 8 have different refractive indices from each other, the rods 7 are placed to a pair of oppositely placed parts 5a and 5b each occupying a definite angle in the whole circumference and the rods 8 are placed to the other pair of the parts 6a and 6b occupying the remaining parts. The rods 4, 7 and 8 can be manufactured easily by forming the preforms e.g. by vapor- phase chemical deposition process, etc., and drawing the rods to the desired diameters under heating. The assembled structure is integrated by heating, and spun at a definite speed under melting while preventing the inclusion of bubbles to obtain a polarization-maintaining single mode optical fiber 21 easily.

公开(公告)号：JPS5992938A

公开(公告)日：1984-05-29

申请号：JP20401882

申请日：1982-11-19

Applicant: FUJITSU LTD

Inventor： TSUKAMOTO MAKOTO ,  OKAMURA KOUJI ,  YUASA MITSUO

IPC: C03B37/012 ,  G02B6/024

Abstract: PURPOSE:To obtain the titled optical fiber haing unchangeable polarization characteritics easily and inexpensively, by using a commercially available high-purity quartz tube as a side rod for providing strain, using a high silicate glass having improved processability instead of a quartz tube for forming the second clad layer. CONSTITUTION:The high-purity quartz rods 24 having a refractive index equal to that of a clad part and a diameter larger than the parent material 21 is put on both sides of the solid rod parent material 21 consisting of a core part and the clad part having different refractive indexes. They are inserted into the thick high silicate glass tube 26 having higher coefficient of linear expansion than the quartz tube 24, heated and integrated to form the solid rod material 27. The rod material 27 is then inserted into a quartz tube, heated, integrated, drawn, to give optical fiber consisting of the light waveguide part 31 comprising the core 32 and the clad 33, the strain providing part 34 made of quartz glass, the second clad laye 35 having a higher heat shrinkage ratio than the quartz glass, and the outer covering layer 36. Consequently, the titled optical fiber having the desired polarization characteristics can be obtained with good processability inexpensively.

公开(公告)号：JPS58184905A

公开(公告)日：1983-10-28

申请号：JP6898982

申请日：1982-04-23

Applicant: Fujitsu Ltd

Inventor： TSUKAMOTO MAKOTO ,  YUASA MITSUO

IPC: C03B37/12 ,  C03C25/10 ,  G02B6/024

Abstract: PURPOSE:To prevent the deterioration in polarization characteristics owing to oscillation, bending and twisting by forming a secondary coating layer of a thermoplastic resin continuously by extrusion coating on the outside circumferential surface of a primarily coated single mode optical fiber which is beforehand formed while said fiber is kept applied with required twisting. CONSTITUTION:A single mode optical fiber strand 1 which is produced by coating the strand with a silicone resin is let off from a rotary spool 3 and is passed through the inside of a feed capstan 4, a wire twister 5 and a resin extrusion coater 6 and is then taken up on a take-up drum 7. The strand is passed through the inside of the twister 5 under adjustment of the revolution of the capstan 4 and the drum 7 to apply twisting continuously on the primarily coated fiber 1 which is then fed into the coater 6. The fiber which is formed with a secondary coating layer consisting of a thermoplastic resin such as nylon on the outside surface by extrusion coating is taken up on the drum 7. The single polarization optical fiber 2 having the stable twisted construction and the desired polarization characteristics is obtained by the above-mentioned method.

Abstract translation: 目的：为了防止由于通过在预先形成的主要涂覆的单模光纤的外周面上形成热塑性树脂的二次涂层而连续地形成由于振动，弯曲和扭曲引起的极化特性的劣化，同时所述纤维 保持施加所需的扭曲。 构成：通过用硅树脂涂布线材制成的单模光纤线束1从旋转卷轴3排出并通过进料绞盘4，线捻线机5和树脂挤出涂布机6的内部 然后将其卷绕在卷取筒7上。在绞盘4和滚筒7的转动的调节下，绞合线穿过捻线机5的内部，以连续地施加在主要涂覆的纤维1上 进料到涂布机6中。在滚筒7上吸收在外表面上由诸如尼龙的热塑性树脂构成的二次涂层形成的纤维。滚筒7上具有稳定的扭曲结构的单极化光纤2 并且通过上述方法获得期望的极化特性。

公开(公告)号：JPS57160929A

公开(公告)日：1982-10-04

申请号：JP4607481

申请日：1981-03-27

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  TATSUTA TAKASHI ,  YUASA MITSUO

IPC: C03B37/012 ,  C03B20/00 ,  C03B37/027 ,  G02B6/00

Abstract: PURPOSE:To prevent impurities in a furnace from entering a glass tube for cladding by sealing one end of the tube before putting a glass rod into the tube from the other end. CONSTITUTION:A glass tube 1 with one sealed end for cladding is supported with a holding arm 25 connected to a movable support section 23 which is freely movable in the vertical direction. A previously manufactured preform rod 21 is coaxially fixed in the tube 1 in the clean and dry inert gaseous atmosphere of the tube 1 with a holding arm 22 connected to other movable support section 24. By rotating movable screws 26, 27, the support sections 23, 24 are lowered simultaneously and perpendicularly to feed the tube 1 and the rod 21 into a heating furnace 28, and the tube 1 and the rod 21 are melted by heating and unitedly spun at a prescribed drawing speed.

公开(公告)号：JPS56169142A

公开(公告)日：1981-12-25

申请号：JP7360280

申请日：1980-05-30

Applicant: FUJITSU LTD

Inventor： TSUKAMOTO MAKOTO ,  YUASA MITSUO

IPC: C03B37/018 ,  G02B6/00

Abstract: PURPOSE:To easily form a glass deposited layer having a desired composition by introducing gaseous starting material with a high b.p. into a reaction tube from a feeding pipe through a movable type heat insulating feeding pipe internally provided with a heating means. CONSTITUTION:The gaseous starting material introducing end 21 of a reaction tube 1 with both ends attached to a rotating mechanism 2 is connected to one end of a gaseous starting material feeding pipe 22 through connecting members 23, 24 and a movable sealing part 25, and a movable type gaseous starting material feeding pipe 27 provided with a heating means 33 between the inner pipe 31 and the outer pipe 32 is placed through the member 23 at the end 21. The inner pipe 31 of the feeding pipe 27 is heated, and gaseous starting material with a high b.p. is introduced into the tube 1 from the pipe 22 through the pipe 27. At the same time, while moving a heating means 3 in the longitudinal direction of the tube 1, the tube 1 is heated to a high temp. to melt the reaction product deposited on the inner wall of the tube 1. Thus, a transparent glass layer is formed.

公开(公告)号：JPS56169141A

公开(公告)日：1981-12-25

申请号：JP7360180

申请日：1980-05-30

Applicant: FUJITSU LTD

Inventor： TSUKAMOTO MAKOTO ,  YUASA MITSUO

IPC: C03B37/018 ,  G02B6/00

Abstract: PURPOSE:To efficiently deposit a uniform glass layer at a proper vitrifying temp. by installing a glass transparency measuring system interlocking with a heating means and a radiation pyrometer detecting the temp. of an outer wall at a vitrifying part so as to control the heating temp. CONSTITUTION:Gaseous starting material A is introduced into a transparent glass tube 1 from the arrow B direction. The tube 1 is locally heated with a heating means 2 mounted on a moving stand 3 moving in the longitudinal direction of the tube 1 to chemically react the gaseous material A in a vapor phase, and the reaction product deposited on the inner wall of the tube 1 is vitrified. Laser beams from a laser device 7 are passed through the tube 1 perpendicularly to the axis of the tube 1 through a reflecting mirror 4, and the beams are made incident to a photodetector 5 and subjected to photoelectric conversion. A signal corresponding to the detected output is fed to a flow rate controller 8. On the other hand, a slight change in the heating temp. of the tube 1 is measured with a radiation pyrometer 6, and a signal corresponding to the detected signal is fed to the controller 8 to control the flow rates of gases for the heating means 2 with mass flow meters 9, 10.

公开(公告)号：JPS54138688A

公开(公告)日：1979-10-27

申请号：JP4342978

申请日：1978-04-12

Applicant: FUJITSU LTD

Inventor： YUASA MITSUO ,  ROKUSHIYA KIYOSHI

IPC: C03C25/12 ,  B05D3/10 ,  B05D7/00 ,  C03B37/00 ,  C03C25/00 ,  G02B6/44