公开(公告)号：US5930437A

公开(公告)日：1999-07-27

申请号：US825912

申请日：1997-04-02

申请人： Michihiro Nakai ,  Kensuke Shima ,  Hiroshi Hidaka ,  Satoshi Okude ,  Masaaki Sudoh ,  Tetsuya Sakai ,  Akira Wada ,  Ryozo Yamauchi

发明人： Michihiro Nakai ,  Kensuke Shima ,  Hiroshi Hidaka ,  Satoshi Okude ,  Masaaki Sudoh ,  Tetsuya Sakai ,  Akira Wada ,  Ryozo Yamauchi

IPC分类号： G02B6/00 ,  G02B6/12 ,  G02B6/122 ,  G02B6/124 ,  G02B6/13 ,  G02B6/10

CPC分类号： G02B6/124 ,  G02B2006/12107 ,  G02B2006/12109

摘要： Core comprises a main stem which is formed on a substrate, linearly extending in the beam propagating direction and short branches with a certain length which extend perpendicularly to the beam propagating direction toward both sides along the plane of the substrate and are arranged at regular intervals in the beam propagating direction. Thus, the branches are arranged in a ladder geometry when it is viewed from the top, forming a rectangular waveform arrangement. The core constitutes a grating structure in which the width of the core is made to vary periodically with the branches in the beam propagating direction.

摘要翻译： 芯部包括形成在基板上的主杆，其在光束传播方向上线性延伸并且具有一定长度的短分支，其沿着基板的平面朝向两侧垂直于光束传播方向延伸，并且以规则的间隔布置 光束传播方向。 因此，当从顶部观察时，分支被布置成梯形几何形状，形成矩形波形布置。 芯构成了光栅结构，其中芯的宽度使光束传播方向上的分支周期性地变化。

公开(公告)号：US5267339A

公开(公告)日：1993-11-30

申请号：US895480

申请日：1992-06-08

申请人： Ryozo Yamauchi ,  Akira Wada ,  Tetsuo Nozawa ,  Daiichirou Tanaka ,  Tetsuya Sakai

发明人： Ryozo Yamauchi ,  Akira Wada ,  Tetsuo Nozawa ,  Daiichirou Tanaka ,  Tetsuya Sakai

IPC分类号： C03C13/04 ,  C03B37/014 ,  C03B37/025 ,  C03B37/029 ,  G02B6/02

CPC分类号： C03B37/029 ,  C03B37/01413 ,  C03B37/0253 ,  G02B6/02 ,  C03B2201/12 ,  C03B2201/31 ,  C03B2203/02 ,  C03B2203/06 ,  C03B2203/10 ,  C03B2203/18 ,  C03B2203/24 ,  C03B2203/36 ,  C03B2205/40

摘要： The present invention is directed to an optical fiber comprising a core and a cladding layer wherein at least one of the constitutional parameters thereof changes along the longitudinal direction of the optical fiber. In order to present a useful optical fiber wherein the occurrence of a Brillouin scattering is prevented, an optical fiber having altered constitutional parameters is found to be effective. The constitutional parameters mean the parameters which determine the constitution of the optical fiber and is capable of influencing the condition of electromagnetic wave transmitting therethrough such as light or acoustic wave. The constitutional parameters include diameter of the core, index of refraction of the core, diameter of the optical fiber, composition of the glass, residual stress of the core. Some examples are disclosed about their manufacturing process and the test results. Much improvement was measured, especially in the use for a single mode optical fiber.

公开(公告)号：US5066087A

公开(公告)日：1991-11-19

申请号：US490026

申请日：1990-03-07

申请人： Ryozo Yamauchi ,  Noboru Kawakami ,  Fumio Suzuki

发明人： Ryozo Yamauchi ,  Noboru Kawakami ,  Fumio Suzuki

IPC分类号： G02B6/28 ,  G02B6/34

CPC分类号： G02B6/29332 ,  G02B6/2835

摘要： The optical fiber coupler of the present invention is characterized in that, for a defined section in which two or more component optical fibers are thermally fused and elongated thereby forming a fused-elongated region which constitutes the optical fiber coupler, that at least one of the component optical fibers is formed from a single mode optical fiber material employed within a parameter range in which the mode field diameter increases monotonically with decrease in the diameter of the optical fiber core. The optical fiber coupler is further characterized in that, when using optical fibers from which a portion of the coating material has been removed thereby exposing the cladding, and by aligning two or more of such component optical fibers side by side in a plane and mutually thermally fusing the exposed cladding of adjacent optical fibers, after which the fused region is drawn out, thereby forming a fused-elongated region which constitutes the optical fiber coupler, for such an optical fiber coupler, optical fiber material is used in which the softening temperature of the core is higher than that of the cladding, and further, for the drawing out of the mutually fused sections, the tension employed is such that by virtue of remaining stress, the refractive index of the core is reduced.

摘要翻译： 本发明的光纤耦合器的特征在于，对于其中两个或更多个组件光纤被热熔合和拉长的限定部分，由此形成构成光纤耦合器的熔融拉长区域，至少一个 分量光纤由单模光纤材料形成，该单模光纤材料在模场直径随着光纤芯直径的减小而单调增加的参数范围内使用。 光纤耦合器的特征还在于，当使用从其中去除了一部分涂层材料的光纤而使包层暴露的光纤，并且通过将两个或更多个这种组件光纤并排在一个平面中并相互热 熔化相邻光纤的暴露的包层，之后将熔融区域拉出，从而形成构成光纤耦合器的熔融 - 伸长区域，对于这种光纤耦合器，使用光纤材料，其中软化温度 该芯高于包层的芯，此外，为了从相互熔合的部分拉出，所使用的张力使得由于剩余应力，芯的折射率降低。

公开(公告)号：US4935045A

公开(公告)日：1990-06-19

申请号：US297971

申请日：1989-01-17

申请人： Ryozo Yamauchi ,  Matsuhiro Miyamoto ,  Tatsuyuki Oohashi ,  Osamu Fukuda

发明人： Ryozo Yamauchi ,  Matsuhiro Miyamoto ,  Tatsuyuki Oohashi ,  Osamu Fukuda

IPC分类号： G02B6/024 ,  C03B20/00 ,  C03B37/014 ,  C03B37/018 ,  G02B6/02

CPC分类号： C03B37/0142 ,  C03B37/01493 ,  C03B2203/30 ,  C03B2203/31 ,  C03B2203/34 ,  C03B2207/06 ,  C03B2207/20 ,  C03B2207/60

摘要： Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod functioning as the core in said optical fiber in parallel relationship, (b) depositing glass soot around an assembly of said plural parallel fixed glass rods, thereby providing a single porous cladding bearing the predetermined shape, and (c) vitrifying the porous cladding by thermal fusion, thereby providing the entirely integral transparent preform. The above method does not involve any process of perforating a drilled-pore which is needed inevitably in conventional method. Therefore, it is possible to obtain a long preform with high dimensional precision, and to fabricate the optical fiber with low transmission loss.

公开(公告)号：US06535678B1

公开(公告)日：2003-03-18

申请号：US09701399

申请日：2000-11-28

申请人： Ryozo Yamauchi ,  Tomio Abiru ,  Shoichiro Matsuo ,  Koichi Takahashi

发明人： Ryozo Yamauchi ,  Tomio Abiru ,  Shoichiro Matsuo ,  Koichi Takahashi

IPC分类号： G02B602

CPC分类号： G02B6/03666 ,  G02B6/02019 ,  G02B6/021 ,  G02B6/02138 ,  G02B6/02271 ,  G02B6/03611 ,  G02B6/03633 ,  G02B6/03644 ,  G02B6/0365 ,  G02B6/14

摘要： The present invention's multimode optical fiber is characterized in that the propagating modes include a mode the lowest and second or higher order modes; and the difference between the propagation constants of the lowest order mode and the second order mode is 2-fold or more than the difference between the propagation constants of adjacent modes that are second order or higher order modes. Due to this design, single mode propagation becomes possible once the modes have propagated over a specific distance. As a result, it is possible to relax the conventional single mode conditions, enabling the fiber parameters to be set relatively freely.

摘要翻译： 本发明的多模光纤的特征在于，传播模式包括最低和第二或更高阶模式的模式; 并且最低阶模式和第二阶模式的传播常数之间的差异是作为二阶或更高阶模式的相邻模式的传播常数之间的差异的2倍或更多。 由于这种设计，一旦模式在特定距离上传播，单模传播就变得可能。 结果，可以放松常规的单模式条件，使光纤参数相对自由地设定。

公开(公告)号：US06459829B1

公开(公告)日：2002-10-01

申请号：US09497343

申请日：2000-02-03

申请人： Ryozo Yamauchi ,  Akira Wada ,  Kenji Nishide ,  Shigefumi Yamasaki

发明人： Ryozo Yamauchi ,  Akira Wada ,  Kenji Nishide ,  Shigefumi Yamasaki

IPC分类号： G02B628

CPC分类号： H04B10/506 ,  G02B6/02138 ,  G02B6/12011 ,  G02B6/12019 ,  H01S5/4062 ,  H01S5/4087 ,  H04J14/02

摘要： The present invention provides a multiple wavelength excitation light source characterized in the provision of an optical multiplexing element that has a plurality of input terminals connected to lasers and functions to multiplex a plurality of lights that have different characteristics; and a reflecting element inserted near the output side of the output terminal of the optical multiplexing element, and functioning to reflect the light multiplexed at the optical multiplexing element at a low reflection coefficient. Accordingly, it becomes possible to provide high output excitation light in a stable manner.

摘要翻译： 本发明提供一种多波长激发光源，其特征在于提供一种光复用元件，其具有连接到激光器的多个输入端，并且具有多路复用具有不同特性的多个光; 以及反射元件，其插入在光复用元件的输出端的输出侧附近，并且以低反射系数反射在光复用元件处复用的光。 因此，可以稳定地提供高输出激励光。

公开(公告)号：US5058979A

公开(公告)日：1991-10-22

申请号：US242469

申请日：1990-06-21

申请人： Ryozo Yamauchi ,  Noboru Kawakami ,  Fumio Suzuki

发明人： Ryozo Yamauchi ,  Noboru Kawakami ,  Fumio Suzuki

IPC分类号： G02B6/255 ,  G02B6/28 ,  G02B6/34

CPC分类号： G02B6/29332 ,  G02B6/2552 ,  G02B6/2835 ,  G02B2006/2865

摘要： The present invention provides a wide wavelength range optical fiber coupler that to the greatest extent possible, allows optical coupling which is wavelength independent, and thus demonstrates a constant coupling ratio over a wide range of wavelengths. By causing various irregularities to be formed in the fused-elongated region of an optical fiber coupler, thereby leading to the generation of additional modes in addition to the fundamental modes, while at the same time causing multiple mode coupling in which the above mentioned additional modes participate in the coupling of the fundamental modes, it is possible to selectively control the coupling strength at determined wavelengths and thereby achieve optical coupling which is largely wavelength independent and thus demonstrates a relatively constant coupling ratio over a wide range of wavelengths. Furthermore, by causing the strength of coupling between the cores of each component optical fiber to vary along the length of the longitudinal axis of each component optical fiber, it is possible to decrease the degree of sinusoidal variation in the wavelength dependance characteristics of each component optical fiber, thereby making it possible to further achieve optical coupling which is wavelength independent and thus considerably constant over a wide range of wavelengths.

公开(公告)号：US4834786A

公开(公告)日：1989-05-30

申请号：US68223

申请日：1987-06-29

申请人： Ryozo Yamauchi ,  Matsuhiro Miyamoto ,  Tatsuyuki Oohashi ,  Osamu Fukuda

发明人： Ryozo Yamauchi ,  Matsuhiro Miyamoto ,  Tatsuyuki Oohashi ,  Osamu Fukuda

IPC分类号： G02B6/024 ,  C03B20/00 ,  C03B37/014 ,  C03B37/018 ,  G02B6/02

CPC分类号： C03B37/0142 ,  C03B37/01493 ,  C03B2203/30 ,  C03B2203/31 ,  C03B2203/34 ,  C03B2207/06 ,  C03B2207/20 ,  C03B2207/60

摘要： Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod functioning as the core in said optical fiber in parallel relationship, (b) depositing glass soot around an assembly of said plural parallel fixed glass rods, thereby providing a single porous cladding bearing the predetermined shape, and (c) vitrifying the porous cladding by thermal fusion, thereby providing the entirely integral transparent preform. The above method does not involve any process of perforating a drilled-pore which is needed inevitably in conventional method. Therefore, it is possible to obtain a long preform with high dimensional precision, and to fabricate the optical fiber with low transmission loss.

摘要翻译： 公开了一种制造用于非对称光纤的预成型件的方法，该方法包括以下步骤：（a）将多个透明玻璃棒固定在所述光纤中作为芯的至少一个核 - 母棒作平行关系，（b） 玻璃烟灰围绕所述多个平行的固定玻璃棒的组件，从而提供一个具有预定形状的单个多孔包层，和（c）通过热熔融玻璃化多孔包层，从而提供完全整体的透明预制件。 上述方法不涉及在常规方法中不可避免地需要钻孔的任何过程。 因此，可以获得具有高尺寸精度的长预制件，并且制造具有低传输损耗的光纤。