公开(公告)号：US06580854B1

公开(公告)日：2003-06-17

申请号：US09615955

申请日：2000-07-13

申请人： Tadashi Enomoto ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Michiko Harumoto

发明人： Tadashi Enomoto ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Michiko Harumoto

IPC分类号： G02B634

CPC分类号： G02B6/0219 ,  G02B6/02095 ,  G02B6/02142 ,  G02B6/02147

摘要： In an optical waveguide grating in an optical fiber having a cladding region around a core region, a periodic refractive index distribution is existed in a predetermined area of the core region along the optical axis. The core region has a composition of GeO2—P2O5—SiO2 based glass, for example, whereas the cladding region is made of SiO2, and the co-doping ratio in the core region is adjusted, so as to lower the temperature dependence of characteristics. The doping amount of P2O5 in the core region is preferably {fraction (1/15)} to 1 times, more preferably 0.6 to 1 times that of GeO2.

摘要翻译： 在具有围绕芯区域的包层区域的光纤中的光波导光栅中，周期性折射率分布存在于沿着光轴的芯区域的预定区域中。 核心区域例如具有GeO 2 -P 2 O 5 -SiO 2基玻璃的组成，而包层区域由SiO 2制成，并且调整芯部区域中的共掺杂比，以降低特性的温度依赖性。 核心区域中的P2O5的掺杂量优选为GeO 2的1/15〜1倍，更优选为0.6〜1倍。

公开(公告)号：US06563984B1

公开(公告)日：2003-05-13

申请号：US09504898

申请日：2000-02-16

申请人： Michiko Harumoto ,  Masakazu Shigehara ,  Shinji Ishikawa ,  Tadashi Enomoto

发明人： Michiko Harumoto ,  Masakazu Shigehara ,  Shinji Ishikawa ,  Tadashi Enomoto

IPC分类号： G02B626

CPC分类号： G02B6/02095

摘要： The present invention relates to a long-period grating device which eliminates only a desirable wavelength of core-mode light in a wavelength band in use from 1525 nm to 1610 nm. The long-period grating device according to the present invention comprises an optical fiber provided with a core region and a cladding region, whereas a long-period grating whose refractive index changes with a period &Lgr; in the advancing direction of light is provided in the core region, wherein the period &Lgr; is set such that the absolute value of a loss peak due to mode coupling concerning a refractive index modulation component with a period &Lgr;/(2n+1) (n=1, 2, 3, 4) is 0.2 dB or less in the wavelength band in use.

摘要翻译： 本发明涉及一种长周期光栅器件，其仅消除了使用中的1525nm至1610nm的波长范围内的核心光的理想波长。 根据本发明的长周期光栅装置包括设置有芯区域和包层区域的光纤，而在光的前进方向上折射率随周期LAMBD变化的长周期光栅设置在芯 区域，其中周期LAMBD被设置为使得由于与周期LAMBD /（2n + 1）（n = 1,2,3,4）的折射率调制分量的模式耦合的损耗峰值的绝对值为0.2 dB或更小的波长带。

公开(公告)号：US06504962B2

公开(公告)日：2003-01-07

申请号：US09909897

申请日：2001-07-23

申请人： Shinji Ishikawa ,  Toru Iwashima ,  Michiko Harumoto ,  Akira Inoue ,  Masakazu Shigehara

发明人： Shinji Ishikawa ,  Toru Iwashima ,  Michiko Harumoto ,  Akira Inoue ,  Masakazu Shigehara

IPC分类号： G02B634

CPC分类号： G02B6/02185

摘要： The present invention provides a method for determining a condition of aging for an optical waveguide grating. In this method, the aged deterioration,curve of the optical waveguide grating is set as a forms of C·t−&agr;, t represents time, and &agr; and C represent parameters. Then, the condition of the aging is determined based on the aged deterioration curve.

摘要翻译： 本发明提供了一种用于确定光波导光栅的老化状况的方法。 在这种方法中，光波导光栅的老化变形曲线被设置为C.t-α，t表示时间的形式，α和C表示参数。 然后，根据老化退化曲线确定老化条件。

公开(公告)号：US06785444B2

公开(公告)日：2004-08-31

申请号：US10129276

申请日：2002-10-01

申请人： Shinji Ishikawa ,  Masakazu Shigehara ,  Michiko Takushima ,  Tadashi Enomoto

发明人： Shinji Ishikawa ,  Masakazu Shigehara ,  Michiko Takushima ,  Tadashi Enomoto

IPC分类号： G02B634

CPC分类号： G02B6/021 ,  G02B6/02095 ,  G02B6/03633

摘要： An optical fiber grating device 1 is a device in which a long period grating 14 is formed in a core region 11 of an optical fiber 10 consisting of the core region 11 having a refractive index n1 and an outside diameter 2a, a first cladding region 12 surrounding the core region 11 and having a refractive index n2 and an outside diameter 2b, and a second cladding region 13 surrounding the first cladding region 12 and having a refractive index n3 and an outside diameter 2c. There is a magnitude relation of n1>n2>n3 among the refractive index n1 of the core region 11, the refractive index n2 of the first cladding region 12, and the refractive index n3 of the second cladding region 13, a relative refractive index difference &Dgr;n2 of the first cladding region 12 to the second cladding region 13 is not less than 0.5%, and a thickness (c−b) of the second cladding region 13 with respect to a transmission loss peak wavelength &lgr; is in a range of not less than &lgr; nor more than 10&lgr;.

摘要翻译： 光纤光栅装置1是在由具有折射率n1和外径2a的纤芯区域11构成的光纤10的芯部区域11中形成长周期光栅14的装置，第一包层区域12 围绕芯区域11并具有折射率n2和外径2b，以及围绕第一包层区域12并具有折射率n3和外径2c的第二包层区域13。 在芯区域11的折射率n1，第一包层区域12的折射率n2和第二包层区域13的折射率n3之间存在n1> n2> n3的大小关系，相对折射率差 第一包层区域12到第二包层区域13的Deltan2不小于0.5％，第二包层区域13相对于透射损耗峰值波长λ的厚度（cb）在不小于λ的范围内 也不超过10lambda。

公开(公告)号：US06487340B2

公开(公告)日：2002-11-26

申请号：US09903763

申请日：2001-07-13

申请人： Tadashi Enomoto ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Michiko Takushima

发明人： Tadashi Enomoto ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Michiko Takushima

IPC分类号： G02B634

CPC分类号： G02B6/02095 ,  G02B6/03633 ,  G02B6/03666 ,  G02B6/14 ,  G02B6/266

摘要： The present invention relates to an optical fiber grating element having structure enabling more precise design and fabrication, a production method thereof, and an optical fiber filter including the same. The optical fiber grating element according to the present invention comprises a multi-mode optical fiber having a first core region of a refractive index n1, a second core of a refractive index n2 provided on a periphery of the first core region, and a cladding region of a refractive index n3 provided on a periphery of the second core region, and having a cutoff wavelength regarding to LP02-mode light on the longer wavelength side than a wavelength band in use. A long-period grating for selectively coupling the fundamental LP01-mode light of a predetermined wavelength in the wavelength band I use to LP0m (m≧2)-mode light is provided in a predetermined region of the first core region.

摘要翻译： 本发明涉及具有能够进行更精确的设计和制造的结构的光纤光栅元件及其制造方法以及包括该光纤光栅的光纤滤波器。 根据本发明的光纤光栅元件包括具有折射率n1的第一纤芯区域和设置在第一纤芯区域周围的折射率n2的第二纤芯的多模光纤，以及包覆区域 设置在第二纤芯区域的周围的折射率n3，并且在比使用的波长带更长的波长侧具有关于LP02模式光的截止波长。 在第一核心区域的预定区域中提供用于将波长带I中使用的预定波长的基本LP01模式光选择性地耦合到LP0m（m> = 2）模式光的长周期光栅。

公开(公告)号：US06490078B2

公开(公告)日：2002-12-03

申请号：US09809301

申请日：2001-03-16

申请人： Tadashi Enomoto ,  Masahiro Takagi ,  Yuichi Ohga ,  Motoki Kakui ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Shinji Endo

发明人： Tadashi Enomoto ,  Masahiro Takagi ,  Yuichi Ohga ,  Motoki Kakui ,  Shinji Ishikawa ,  Masakazu Shigehara ,  Shinji Endo

IPC分类号： G02B634

CPC分类号： H01S3/06708 ,  H01S3/06716 ,  H01S3/06729 ,  H01S3/06754

摘要： The present invention relates to an OFA having a high signal gain, easily manufactured, having a high mechanical strength, having a small splice loss with respect to other optical fibers, and rarely encountering the occurrence of noise at a signal wavelength. The OFA according to the present invention has a function of amplifying signals propagating therethroug by pumping light supplied thereto, and comprises, at least, a core region, an inner cladding region provided on the periphery of the core region, an outer cladding region provided on the periphery of the inner cladding region, and one or more node coupling gratings. An element for signal amplification is added to at least the core region. The core region has a structure ensuring a core mode with respect to the signals, while the inner cladding region has a structure ensuring a multi-mode with respect to the pumping light. Each of the mode coupling gratings passes core mode signals therethrough, and induces a mode coupling between the inner cladding mode and the core mode with respect to the pumping light.

摘要翻译： 本发明涉及具有高机械强度，易于制造的具有高信号增益，相对于其它光纤具有小的接合损耗，并且很少遇到在信号波长处的噪声的发生的OFA。 根据本发明的OFA具有通过泵送供给到其上的光来传播传播的信号的功能，并且至少包括芯区域，设置在芯区域周围的内包层区域，设置在芯区域 内包层区域的周边，以及一个或多个节点耦合光栅。 用于信号放大的元件至少加到核心区域。 芯区域具有确保相对于信号的芯模式的结构，而内包层区域具有确保相对于泵浦光的多模式的结构。 每个模式耦合光栅通过芯模信号，并且相对于泵浦光在内包层模式和芯模之间引起模耦合。

公开(公告)号：US06137931A

公开(公告)日：2000-10-24

申请号：US70799

申请日：1998-05-01

申请人： Shinji Ishikawa ,  Toru Iwashima ,  Michiko Harumoto ,  Akira Inoue

发明人： Shinji Ishikawa ,  Toru Iwashima ,  Michiko Harumoto ,  Akira Inoue

IPC分类号： G02B6/34

CPC分类号： G02B6/02185

摘要： The present invention provides a method for determining a condition of aging for an optical fiber grating. This method comprises a step of setting the aged deterioration curve of the optical fiber grating as a form proportional to t.sup.-n, where t represents time, and n represents a parameter dependent on temperature; and a step of determining the condition of the aging according to the aged deterioration curve.

摘要翻译： 本发明提供一种用于确定光纤光栅老化状况的方法。 该方法包括将光纤光栅的老化劣化曲线设置为与t-n成比例的形式，其中t表示时间，n表示取决于温度的参数的步骤; 以及根据老化劣化曲线确定老化条件的步骤。

公开(公告)号：US06292607B1

公开(公告)日：2001-09-18

申请号：US09343472

申请日：1999-06-30

申请人： Shinji Ishikawa ,  Toru Iwashima ,  Michiko Takushima (nee Harumoto) ,  Akira Inoue ,  Masakazu Shigehara

发明人： Shinji Ishikawa ,  Toru Iwashima ,  Michiko Takushima (nee Harumoto) ,  Akira Inoue ,  Masakazu Shigehara

IPC分类号： G02B634

CPC分类号： G02B6/02185

摘要： The present invention provides a method for determining a condition of aging for an optical waveguide grating. In this method, the aged deterioration curve of the optical waveguide grating is set as a form of C·t−&agr;, where t represents time, and &agr; and C represent parameters. Then, the condition of the aging is determined based on the aged deterioration curve.

摘要翻译： 本发明提供了一种用于确定光波导光栅的老化状况的方法。 在该方法中，将光波导光栅的老化劣化曲线设定为C.t-α的形式，其中t表示时间，α和C表示参数。 然后，根据老化退化曲线确定老化条件。

公开(公告)号：US06788874B1

公开(公告)日：2004-09-07

申请号：US09570392

申请日：2000-05-12

申请人： Shinji Ishikawa ,  Masakazu Shigehara

发明人： Shinji Ishikawa ,  Masakazu Shigehara

IPC分类号： G02B600

CPC分类号： G02B6/0219 ,  G02B6/02033 ,  G02B6/02185 ,  G02B6/138

摘要： An optical component is an optical fiber grating element having a grating formed in the core region of an optical fiber, and a cladding region is made of silica glass. An optical material for the core region is ladder-type silicone resin, whose refractive index is set to a desired value by appropriately adjusting the mixing ratio between SiO and a functional group and the mixing ratio of a phenyl group to a methyl group. The optical component has a desired thermal expansion coefficient and desired temperature characteristics as a whole.

摘要翻译： 光学部件是光纤光栅元件，其具有形成在光纤的纤芯区域中的光栅，并且包层区域由石英玻璃制成。 用于核心区域的光学材料是梯形硅树脂，其通过适当地调节SiO和官能团之间的混合比和苯基与甲基的混合比，将折射率设定为期望值。 光学部件整体上具有期望的热膨胀系数和期望的温度特性。

公开(公告)号：US06522810B2

公开(公告)日：2003-02-18

申请号：US09983392

申请日：2001-10-24

申请人： Michiko Takushima ,  Shinji Ishikawa ,  Masakazu Shigehara

发明人： Michiko Takushima ,  Shinji Ishikawa ,  Masakazu Shigehara

IPC分类号： G02B634

CPC分类号： G02B6/0208 ,  G02B6/02095

摘要： The optical loss filter according to the present invention is configured such that a first long-period grating and a second long-period grating are formed in cascade on a unitary optical fiber having a core region and a cladding region. A coating layer surrounding a part of the cladding region is provided between the first and second long-period gratings. The optical loss filter can be made smaller, and can easily realize a desirable loss characteristic.