公开(公告)号：US20050270635A1

公开(公告)日：2005-12-08

申请号：US11185874

申请日：2005-07-21

申请人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

发明人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

IPC分类号： G02F1/01 ,  G02F1/09 ,  H01S3/00 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/16

CPC分类号： H04B10/2931 ,  G02F1/0123 ,  G02F1/093 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094015 ,  H01S3/10015 ,  H01S3/10023 ,  H01S3/1305 ,  H01S3/1608 ,  H04B10/2941

摘要： An optical apparatus which is reduced in the number of optical devices arranged on a main optical signal transmission path, thereby reducing the size and cost of the device, and which is improved in optical transmission quality. An optical amplifier includes an amplification medium, which is doped with an active material for optical amplification and to which pump light is introduced, for amplifying an optical signal to be output. A reflection-type variable optical attenuator includes a reflecting mirror for reflecting an input light to generate a reflected light, and a magneto-optical crystal arranged in a position where the input and reflected lights pass. The magneto-optical crystal is applied with a magnetic field to induce a Faraday rotation angle therein and thereby vary an attenuation amount of the amplified optical signal, and part of light transmitted through the reflecting mirror is converted, as input monitor light, into an electrical signal.

摘要翻译： 减少了布置在主光信号传输路径上的光学装置的数量的光学装置，从而减小了装置的尺寸和成本，并提高了光传输质量。 光放大器包括一个放大介质，其被掺入用于光放大的有源材料并被引入泵浦光，用于放大要输出的光信号。 反射型可变光衰减器包括用于反射输入光以产生反射光的反射镜和布置在输入和反射光通过的位置的磁光晶体。 磁光晶体被施加有磁场以在其中诱发法拉第旋转角度，从而改变放大的光信号的衰减量，并且透射通过反射镜的光的一部分作为输入监视光转换成电 信号。

公开(公告)号：US06807335B2

公开(公告)日：2004-10-19

申请号：US09984396

申请日：2001-10-30

申请人： Nobuaki Mitamura ,  Norihisa Naganuma

发明人： Nobuaki Mitamura ,  Norihisa Naganuma

IPC分类号： G02B626

CPC分类号： G02B6/29361 ,  G02B6/266 ,  G02B6/29365 ,  G02B6/29395

摘要： A movable mirror having a mirror surface reflecting a light input from an input fiber collimator is moved in an arrow (1) direction so that the reflection frequency of the input light reflected by an optical filter can be variable. The light is reflected plural times between the mirror surface and the optical filter, directed to a fixed mirror by the mirror surface, reflected by the fixed mirror, and is connected to an output fiber collimator. By moving the movable mirror in parallel, the reflection count of the light between the optical filter and the mirror surface is variable. Therefore, the wavelength characteristic of the light is obtained as an accumulated wavelength characteristic depending on the reflection count.

摘要翻译： 具有反射来自输入光纤准直仪的光输入的反射镜的可移动反射镜沿箭头（1）方向移动，使得由滤光器反射的输入光的反射频率可变。 光在镜面和滤光片之间反射多次，被镜面指向固定的镜面，由固定镜反射，并与输出光纤准直器连接。 通过平行移动可移动反射镜，滤光器和镜面之间的光的反射计数是可变的。 因此，根据反射次数，获得作为累积波长特性的光的波长特性。

公开(公告)号：US06310717B1

公开(公告)日：2001-10-30

申请号：US09313783

申请日：1999-05-17

申请人： Norihisa Naganuma ,  Norifumi Shukunami

发明人： Norihisa Naganuma ,  Norifumi Shukunami

IPC分类号： H01S300

CPC分类号： H01S3/094003 ,  H01S3/067 ,  H01S3/06716 ,  H01S3/06754

摘要： Disclosed herein is an optical amplifier reduced in gain deviation. The optical amplifier includes a nonsilica fiber doped with a rare earth, and a fiber holder in which the nonsilica fiber is inserted and fixed. The fiber holder is optically arranged so that signal light to be amplified propagates in the nonsilica fiber. The nonsilica fiber is pumped so that the nonsilica fiber provides a gain band including the wavelength of the signal light. Opposite ends of the fiber holder are hermetically sealed to thereby easily cut off the nonsilica fiber from the outside air, so that the nonsilica fiber is stabilized physically or chemically. A fluoride glass fiber is suitable for the nonsilica fiber to reduce the gain deviation in a 1.55 &mgr;m band.

摘要翻译： 本文公开了减小增益偏差的光放大器。 光放大器包括掺杂有稀土的非二极管光纤，以及其中插入和固定非二极纤维的光纤保持器。 光纤保持器被光学地布置，使得待放大的信号光在非二极纤维中传播。 泵浦非二极管光纤，使得非二极管光纤提供包括信号光的波长的增益带。 纤维架的相对端密封，从而容易地将非二氧化硅纤维与外部空气切断，使得非二氧化硅纤维物理或化学稳定。 氟化物玻璃纤维适用于非硅纤维，以减少1.55μm带中的增益偏差。

公开(公告)号：US6115178A

公开(公告)日：2000-09-05

申请号：US608127

申请日：1996-02-28

申请人： Norihisa Naganuma ,  Teruhiro Kubo

发明人： Norihisa Naganuma ,  Teruhiro Kubo

IPC分类号： G02B5/20 ,  G02B5/04 ,  G02B5/28 ,  G02B6/293 ,  G02B27/14 ,  G02F1/35 ,  H04B10/00 ,  G02B5/30

CPC分类号： G02B27/108 ,  G02B27/145 ,  G02B5/04 ,  H01S3/06754 ,  H01S3/094019 ,  H01S3/09415 ,  H01S3/1608

摘要： The invention provides an optical device suitable for use with an optical amplifier, for example, in an optical communication system and advantageous in that different functions of a plurality of optical elements are achieved using an optical element of a simple construction and the optical device can be produced in a reduced size at a reduced cost. The optical device includes a tapered prism constructed such that a first face and a second face thereof opposing to each other do not extend in parallel to each other. A dielectric multi-layer film is formed on the first face of the tapered prism positioned on an optical signal inputting side. A reflection film is formed on the second face for reflecting the optical signal inputted to the tapered prism through the first face at least once toward the first face. A non-reflection film is formed on one of the first face, the second face and the other face or faces of the tapered prism for extracting therethrough the optical signal inputted to and reflected in the tapered prism.

摘要翻译： 本发明提供一种适用于光放大器的光学装置，例如在光通信系统中，其优点在于使用简单结构的光学元件实现多个光学元件的不同功能，并且光学装置可以 以减少的成本以减小的尺寸生产。 光学装置包括锥形棱镜，其被构造为使得彼此相对的第一面和第二面不彼此平行地延伸。 在位于光信号输入侧的锥形棱镜的第一面上形成电介质多层膜。 反射膜形成在第二面上，用于通过第一面反射输入到锥形棱镜的光信号至少一次朝向第一面。 在第一面，第二面和锥形棱镜的另一个面之一上形成非反射膜，用于从其中提取输入到锥形棱镜并反射在锥形棱镜中的光信号。

公开(公告)号：US6101025A

公开(公告)日：2000-08-08

申请号：US667125

申请日：1996-06-20

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H04B10/03 ,  H04B10/032 ,  H04B10/071 ,  H04B10/079 ,  H04B10/29 ,  H04B10/293 ,  H04B10/297 ,  H01S3/13 ,  G02B6/36 ,  H01S3/091

CPC分类号： H04B10/2931

摘要： An optical repeater having a first optical amplifier for a first optical fiber transmission line and a second optical amplifier for a second optical fiber transmission line. Each of the first and second optical amplifiers has a doped fiber doped with a rare earth element, a pumping light source for outputting pumping light, a supplying optical coupler for supplying the pumping light to the doped fiber, and an extracting optical coupler for extracting the pumping light. Each extracting optical coupler has an exchange port for outputting a part of the pumping light remaining in the corresponding doped fiber after pumping. The optical repeater further has an optical fiber for connecting the exchange ports in the first and second optical amplifiers to exchange the pumping light. With this configuration, even if one of the pumping light sources has failed, the pumping light from the other pumping light source is supplied to both doped fibers, thereby making the optical repeater have redundancy.

摘要翻译： 一种具有用于第一光纤传输线的第一光放大器和用于第二光纤传输线的第二光放大器的光中继器。 第一和第二光放大器中的每一个具有掺杂有稀土元素的掺杂光纤，用于输出泵浦光的泵浦光源，用于向掺杂光纤提供泵浦光的供应光耦合器，以及用于提取 抽光。 每个提取光耦合器具有用于在泵送之后输出在相应的掺杂光纤中残留的一部分泵浦光的交换端口。 光中继器还具有用于连接第一和第二光放大器中的交换端口以交换泵浦光的光纤。 利用这种结构，即使其中一个泵浦光源发生故障，来自另一个泵浦光源的泵浦光被提供给两个掺杂光纤，从而使光中继器具有冗余性。

公开(公告)号：US5796887A

公开(公告)日：1998-08-18

申请号：US825444

申请日：1997-03-20

申请人： Norihisa Naganuma ,  Hideki Noda

发明人： Norihisa Naganuma ,  Hideki Noda

IPC分类号： G02B6/293 ,  G02B6/34 ,  G02B6/26

CPC分类号： G02B6/2938 ,  G02B6/2937

摘要： An optical device including a lens and an optical thin film for coupling and separating two light components. First and second optical fibers are arranged on one side of the lens at symmetrical positions with respect to the optical axis of the lens, and the optical thin film and a third optical fiber are arranged on the other side of the lens. An isosceles triangular block is arranged to simultaneously move the first and second optical fibers to adjust an incident angle and an emerging angle of the light made incident to the optical thin film. Alternatively, a movable isosceles triangular prism having two oblique reflecting surfaces is arranged.

摘要翻译： 一种包括透镜和用于耦合和分离两个光分量的光学薄膜的光学装置。 第一和第二光纤相对于透镜的光轴在对称位置处布置在透镜的一侧上，并且光学薄膜和第三光纤布置在透镜的另一侧上。 等腰三角形块被布置成同时移动第一和第二光纤以调节入射到光学薄膜的入射角和出射角。 或者，设置具有两个倾斜反射面的可动等腰三角棱镜。

公开(公告)号：US5377040A

公开(公告)日：1994-12-27

申请号：US799159

申请日：1991-11-27

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： G02B5/30 ,  G02B6/26 ,  G02B27/28

CPC分类号： G02B6/2746 ,  G02B1/10 ,  G02B27/283 ,  G02B5/3083

摘要： A polarization independent optical device capable of eliminating the apparent polarization dependence of a dielectric multi-layer film and permitting the design of an optical path at an optional angle of incidence of light beam. The polarization independent optical device comprises a tapered double-refractive crystal disposed so that an optic axis thereof is perpendicular to an incident optical path, and a dielectric multi-layer film disposed on an exit side of light beam with respect to the tapered double-refractive crystal.

摘要翻译： 一种偏振无关光学器件，其能够消除电介质多层膜的表观偏振依赖性，并允许在光束的任意入射角设计光路。 偏振无关光学器件包括锥形双折射晶体，其设置成其光轴垂直于入射光路，并且介电多层膜相对于锥形双折射率设置在光束的出射侧 水晶。

公开(公告)号：US5223975A

公开(公告)日：1993-06-29

申请号：US431240

申请日：1989-11-03

申请人： Norihisa Naganuma ,  Hisashi Takamatsu ,  Kenichi Abe

发明人： Norihisa Naganuma ,  Hisashi Takamatsu ,  Kenichi Abe

IPC分类号： G02B27/28

CPC分类号： G02B27/283 ,  G02B6/2713 ,  G02B6/2773

摘要： A polarization beam coupler adapted to produce an output light beam for monitoring is disclosed. The polarization beam coupler includes a polarization beam coupling cube for coupling two incident light beams having polarization planes perpendicular to each other and projecting the coupled light beams on the same optic axis, a beam splitting cube having a beam splitting film formed from a dielectric multi-layer or single-layer film for extracting a monitor beam, and a quarter-wave plate interposed between the polarization beam coupling cube and the beam splitting cube such that incident light beams to the beam splitting cube may be circularly polarized light. Due to the construction, the output level of a monitor light beam can be prevented from depending upon the polarization planes of the incident light.

公开(公告)号：US06515776B1

公开(公告)日：2003-02-04

申请号：US09314944

申请日：1999-05-20

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： H04J1402

CPC分类号： G02B6/29367 ,  G02B6/2938 ,  H04J14/02

摘要： Disclosed herein is an optical device including a fiber collimator and a plurality of fiber assemblies sequentially optically coupled to the fiber collimator by a reflected light path of a substantially parallel beam. The fiber collimator includes an optical fiber and a lens opposed to the optical fiber. Each fiber assembly includes an optical filter for providing the reflected light path, an optical fiber optically coupled to the optical filter by its transmitted light path, and a lens provided between the optical filter and this optical fiber. The lens of the i-th fiber assembly has a focal length equal to or greater than that of the lens of the (i−1)-th fiber assembly. With this configuration, a deviation in coupling loss or insertion loss due to beam divergence in the reflected light path can be reduced.

摘要翻译： 本文公开了一种光学装置，其包括光纤准直器和通过基本上平行的光束的反射光路顺序地光耦合到光纤准直器的多个光纤组件。 光纤准直器包括光纤和与光纤相对的透镜。 每个光纤组件包括用于提供反射光路的光学滤光器，通过其透射光路光耦合到滤光器的光纤，以及设置在滤光器和该光纤之间的透镜。 第i个光纤组件的透镜具有等于或大于第（i-1）个光纤组件的透镜的焦距。 利用这种配置，可以减少由于反射光路中的光束发散引起的耦合损耗或插入损耗的偏差。

公开(公告)号：US06295393B1

公开(公告)日：2001-09-25

申请号：US09236395

申请日：1999-01-25

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： G02B530

CPC分类号： G02B6/2713 ,  G02B6/2773 ,  G02B6/29362 ,  G02B27/283 ,  H01S3/094003

摘要： A polarized light synthesizing apparatus has a lens assembly including a securing member for securing ends of a plurality of optical fibers which can propagate light having different polarization components and a lens for converting the plural kinds of polarization component light emitted from the optical fibers into collimated beams, and a birefringent member for polarization-synthesizing the plural kinds of polarization component light as the same optical axis using a difference in refractive index characteristic between the plural kinds of polarization component light emitted from the lens, thereby largely decreasing a packaging size of the apparatus while keeping functions of a known optical circuit device, a required resistance to light, reliability and readiness of fabrication.

摘要翻译： 偏振光合成装置具有透镜组件，该透镜组件包括用于固定能够传播具有不同偏振分量的光的多根光纤的端部的固定构件和用于将从光纤发射的多种偏振分量光转换为准直光束的透镜 以及双折射构件，用于使用从透镜发射的多种偏振分量光之间的折射率特性的差异将多种偏振分量光用作相同的光轴进行偏振合成，从而大大降低了装置的封装尺寸 同时保持已知光电路装置的功能，所需的耐光性，可靠性和制造准备性。