公开(公告)号：US06788865B2

公开(公告)日：2004-09-07

申请号：US09799150

申请日：2001-03-05

申请人： Satoki Kawanishi ,  Katsunari Okamoto

发明人： Satoki Kawanishi ,  Katsunari Okamoto

IPC分类号： G02B620

CPC分类号： G02B6/02328 ,  G02B6/02347 ,  G02B6/02357 ,  G02B6/105

摘要： A polarization maintaining optical fiber is formed by using a core in a cross sectional shape having different diameters along two orthogonal axes defined on a plane perpendicular to an optical axis, or a photonic crystal structure cladding having a diffraction grating with lattice intervals for realizing confinement of lights within the core which are different along two orthogonal axes defined on a plane perpendicular to an optical axis, or the photonic crystal structure cladding that is divided into four divided portions along a circumferential direction, where at least a part of lattice holes in a first pair of divided portions that are facing each other along one direction have a diameter larger than that of lattice holes in a second pair of divided portions that are facing each other along another direction orthogonal to the one direction.

摘要翻译： 通过使用具有沿垂直于光轴的平面上限定的两个正交轴的具有不同直径的横截面形状的芯或具有用于实现限制的晶格间隔的衍射光栅的光子晶体结构包层形成偏振维持光纤 芯部内的光沿着与垂直于光轴的平面限定的两个正交轴不同，或者沿着圆周方向分成四个分割部分的光子晶体结构包层，其中第一 沿着一个方向彼此面对的一对分割部分的直径大于沿着与该一个方向正交的另一方向彼此面对的第二对分割部分中的格子孔的直径。

公开(公告)号：US06404966B1

公开(公告)日：2002-06-11

申请号：US09306498

申请日：1999-05-06

申请人： Satoki Kawanishi ,  Katsunari Okamoto

发明人： Satoki Kawanishi ,  Katsunari Okamoto

IPC分类号： G02B602

CPC分类号： G02B6/02328 ,  C03B37/01205 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2203/10 ,  C03B2203/16 ,  C03B2203/30 ,  C03B2203/42 ,  G02B6/02333 ,  G02B6/02347 ,  G02B6/105

摘要： An optical fiber including a core having an area of about several times an optical wavelength and composed of a hollow hole, and a cladding having a diffraction grating which is arranged at least in a peripheral area adjacent to the core and has a grating period equal to ½ the optical wavelength.

摘要翻译： 一种光纤，包括具有大约几倍于光波长并由中空孔组成的芯的芯，以及具有衍射光栅的包层，该衍射光栅至少布置在与芯相邻的周边区域中，并且具有等于 1/2的光波长。

公开(公告)号：US06842565B2

公开(公告)日：2005-01-11

申请号：US10437586

申请日：2003-05-14

申请人： Takuya Ohara ,  Hidehiko Takara ,  Ippei Shake ,  Satoki Kawanishi

发明人： Takuya Ohara ,  Hidehiko Takara ,  Ippei Shake ,  Satoki Kawanishi

IPC分类号： G02F1/39 ,  G02F1/377 ,  H04J14/08 ,  H04L7/00 ,  G02B6/28

CPC分类号： H04J14/08 ,  H04L7/0075

摘要： An optical modulation/multiplexing circuit can fabricate a plurality of nonlinear optical waveguide devices and silica optical waveguides through a small number of processes, and achieve the simplification of the fabrication process and stabilization of the operation by hybrid integration with reduced connection loss. It employs lithium niobate domain inversion optical waveguides as nonlinear optical switches, and implements functions necessary for modulation and multiplexing such as input, splitting, multiplexing and timing adjustment of optical modulation signals and an optical clock signal by connecting glass waveguides to the input and output terminals of the domain inversion optical waveguides. Nonlinear optical media generate a second harmonic light beam of the optical clock signal, and at the same time produces a light beam with a frequency corresponding to the difference frequency of the two high frequency signals, the second harmonic light beam and the signal pulses.

摘要翻译： 光调制/复用电路可以通过少量工艺制造多个非线性光波导器件和二氧化硅光波导，并通过混合集成实现简化制造工艺和稳定操作，减少连接损耗。 它采用铌酸铌畴反射光波导作为非线性光开关，通过将玻璃波导连接到输入和输出端，实现调制和复用所必需的功能，如光调制信号的输入，分离，复用和时序调整以及光时钟信号 的域反转光波导。 非线性光学介质产生光时钟信号的二次谐波光束，并且同时产生具有对应于两个高频信号，二次谐波光束和信号脉冲的差频的频率的光束。

公开(公告)号：US5646774A

公开(公告)日：1997-07-08

申请号：US585566

申请日：1996-01-16

申请人： Hidehiko Takara ,  Satoki Kawanishi ,  Masatoshi Saruwatari

发明人： Hidehiko Takara ,  Satoki Kawanishi ,  Masatoshi Saruwatari

IPC分类号： G02B6/00 ,  G02B6/12 ,  H01S3/06 ,  H01S3/067 ,  H01S3/083 ,  H01S3/098 ,  H01S3/10 ,  H01S3/13 ,  H01S3/136 ,  H01S3/139 ,  H01S3/00

CPC分类号： H01S3/1109 ,  H01S3/06791 ,  H01S3/106 ,  H01S3/1067 ,  H01S3/139

摘要： This invention is an improvement of a mode-locked laser stabilizing method and apparatus used with a mode-locked laser apparatus which comprises an optical cavity which consists of an optical modulator which modulates the loss or the phase of light at a fixed frequency, an optical delay line to electrically change the optical path length of the cavity, and an optical amplifier which amplifies a modulated optical pulses. In this method, at least one of the relaxation oscillation frequency components and the harmonic components in the output optical pulses of the mode-locked laser are extracted, and a process of controlling the optical delay line by using the extracted frequency component as an error signal for feedback control and to suppress the error signal below a fixed value.

摘要翻译： 本发明是与锁模激光装置一起使用的锁模式激光稳定化方法和装置的改进，该装置包括一个光腔，该光腔由调制固定频率的光的损耗或相位的光调制器组成， 延迟线以电变化腔的光路长度，以及放大经调制的光脉冲的光放大器。 在该方法中，提取了锁模激光器的输出光脉冲中的弛豫振荡频率分量和谐波分量中的至少一个，并且通过使用提取的频率分量作为误差信号来控制光学延迟线的处理 用于反馈控制，并将误差信号抑制在固定值以下。

公开(公告)号：US08014645B2

公开(公告)日：2011-09-06

申请号：US10514530

申请日：2003-05-16

申请人： Kazunori Suzuki ,  Satoki Kawanishi ,  Hirokazu Kubota ,  Masatoshi Tanaka ,  Moriyuki Fujita

发明人： Kazunori Suzuki ,  Satoki Kawanishi ,  Hirokazu Kubota ,  Masatoshi Tanaka ,  Moriyuki Fujita

IPC分类号： G02B6/028

CPC分类号： G02B6/02338 ,  G02B6/02042 ,  G02B6/02242 ,  G02B6/02276 ,  G02B6/02347 ,  G02B6/02361 ,  G02B6/0281 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/03688

摘要： A 1.55 μm band dispersion shifted optical fiber is provided which has a low loss and low dispersion slope. A core region “a” is heavily doped with GeO2 . A core region “b” is composed of pure SiO2 glass. A cladding section is arranged around the core region. The cladding section has a lot of holes extending in the longitudinal direction of the optical fiber. The holes of the cladding section are not located at random, but have a honeycomb structure composed of regular hexagons which have a side length of Λ, and serve as a primitive lattice. The center of the core section has a region having a refractive index higher than that of the periphery of the core section. The core section has the refractive index distribution in which the group velocity dispersion at the operation wavelength of the region becomes the normal dispersion.

摘要翻译： 提供1.55μm带隙色散位移光纤，其具有低损耗和低色散斜率。 核心区域“a”被GeO2重掺杂。 核心区域“b”由纯SiO 2玻璃构成。 围绕芯区域布置包层部分。 包层部具有沿着光纤的长度方向延伸的大量孔。 包层部分的孔不是随机的，而是具有由正方形六边形组成的蜂窝结构，其具有Λ的边长，并且用作原始晶格。 芯部的中心具有折射率高于芯部的周边的区域。 芯部具有折射率分布，其中该区域的工作波长处的群速度色散变为正常色散。

公开(公告)号：US20060024009A1

公开(公告)日：2006-02-02

申请号：US10537845

申请日：2003-11-12

申请人： Hirokazu Kubota ,  Satoki Kawanishi ,  Kazumori Suzuki

发明人： Hirokazu Kubota ,  Satoki Kawanishi ,  Kazumori Suzuki

IPC分类号： G02B6/02

CPC分类号： G02B6/02347 ,  B82Y20/00 ,  G02B6/02357

摘要： A single mode photonic crystal fiber including a core with a geometric radius ρ, and a cladding surrounding the core, the cladding including a plurality of cylindrical air holes which have a diameter d and are arranged periodically at center-to-center spacings of Λ. A design is made such that the center-to-center spacing Λ between the air holes is made 1.5 or more times greater than a wavelength λ of propagation light, and a V value given by the following expression is made greater than 2.4 and less than 3.3. At least one of geometric placement of the air holes in the cladding and optical constant distribution of the cladding or core is set less than three-fold rotational symmetry with respect to a central axis of the core. V = 2 ⁢ πρ λ ⁢ ( n core 2 - n eff 2 ) 1 / 2 where neff is an effective refractive index of the cladding, and ncore is a refractive index of the core.

摘要翻译： 包括具有几何半径rho的芯和围绕芯的包层的单模光子晶体光纤，所述包层包括多个具有直径d的圆柱形气孔，并且以λ的中心到中心间隔周期性地布置。 设计使得空气孔之间的中心到中心间隔λλ比传播光的波长λ1大1.5倍，并且由下式表示的V值大于2.4并小于 3.3。 包层中的空气孔的几何放置和包层或芯的光学恒定分布中的至少一个被设置为相对于芯的中心轴小于三倍旋转对称。