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    Method for connecting optical fibers
    42.
    发明授权
    Method for connecting optical fibers 有权

    公开(公告)号：US06666591B2

    公开(公告)日：2003-12-23

    申请号：US09939662

    申请日：2001-08-28

    Applicant: Eisuke Sasaoka ,  Motonori Nakamura ,  Osamu Kasuu

    Inventor： Eisuke Sasaoka ,  Motonori Nakamura ,  Osamu Kasuu

    IPC: G02B6255

    CPC classification number: G02B6/2551 ,  G02B6/2552 ,  G02B6/262

    Abstract: Methods for connecting two optical fibers having different mode field diameters ((MFD) with low connection loss is proposed. One method comprises steps of preparing the third fiber (Fiber 3), a short length and MFD being smaller than that of the first fiber (Fiber 1) and larger than that of the second (Fiber 2), connecting the Fiber 1 to 3, connecting Fiber 2 to 3, and increasing MFD of Fiber 3 near the part connected or to be connected to Fiber 1, or MFD of Fiber 2 near the part connected or to be connected to Fiber 3 by heating the corresponding part. The other method comprises steps of preparing a short length Fiber 3 having smaller MFD than that of Fiber 1, increasing MFD of Fiber 3 near the part to be connected to Fiber 1 by heating the corresponding part, and then connecting Fiber 1 to 3, and 3 to 2 in that order.

    Choromatic dispersion compensating module and optical transmission system using the same
    44.
    发明授权
    Choromatic dispersion compensating module and optical transmission system using the same 失效
    合成色散补偿模块和光传输系统使用该模块

    公开(公告)号：US06574404B2

    公开(公告)日：2003-06-03

    申请号：US09771937

    申请日：2001-01-30

    Applicant: Eisuke Sasaoka ,  Masao Tsukitani ,  Shigeru Tanaka

    Inventor： Eisuke Sasaoka ,  Masao Tsukitani ,  Shigeru Tanaka

    IPC: G02B616

    CPC classification number: H04B10/25133 ,  H04J14/02

    Abstract: The present invention is related to a chromatic dispersion compensating module which realizes signal transmission at a high bit rate by its simple constitution, and an optical transmission system comprising the same. The chromatic dispersion compensating module according to the present invention comprises a chromatic dispersion compensator which compensates for the chromatic dispersion of an optical fiber transmission line at a predetermined wavelength, and a temperature controller which controls the temperature of the chromatic dispersion compensator in such a manner to set the chromatic dispersion of the chromatic dispersion compensator at a desired value. By this constitution, the dispersion compensation control in correspondence with the chromatic dispersion fluctuation in the optical fiber transmission line caused by the temperature fluctuation and the like is made possible. Hence, the cumulative chromatic dispersion as viewed from the entire optical fiber transmission line can be effectively reduced by its simple constitution.

    Abstract translation: 本发明涉及一种通过其简单结构实现高比特率的信号传输的色散补偿模块和包括该色散补偿模块的光传输系统。 根据本发明的色散补偿模块包括补偿预定波长的光纤传输线的色散的色散补偿器，以及以这种方式控制色散补偿器的温度的温度控制器， 将色散补偿器的色散设定在期望值。 通过这种结构，可以实现与由温度波动等引起的光纤传输线中的色散波动相对应的色散补偿控制。 因此，通过简单的结构可以有效地降低从整个光纤传输线观察的累积色散。

    Microstructured optical fiber
    45.
    发明授权
    Microstructured optical fiber 有权
    微结构光纤

    公开(公告)号：US06571045B2

    公开(公告)日：2003-05-27

    申请号：US09764148

    申请日：2001-01-19

    Applicant: Takemi Hasegawa ,  Eisuke Sasaoka ,  Masayuki Nishimura

    Inventor： Takemi Hasegawa ,  Eisuke Sasaoka ,  Masayuki Nishimura

    IPC: G02B602

    CPC classification number: G02B6/02338 ,  B82Y20/00 ,  G02B6/02004 ,  G02B6/02228 ,  G02B6/02261 ,  G02B6/02347 ,  G02B6/02361 ,  G02B6/03611

    Abstract: In an optical fiber having a core region and a cladding region, surrounding the core region, comprising a main medium having different refractive indices from the main medium and spaced apart in the main medium, the core region comprises a central core region having a hollow portion disposed at the center of the core region and an outer core region surrounding the central core region having a mean refractive index higher than the central core region, and the core region has a higher mean refractive index than the cladding region.

    Abstract translation: 在具有芯区域和包层区域的光纤中，围绕芯区域，包括与主介质具有不同折射率且在主介质中间隔的主介质，芯区域包括具有中空部分的中心芯区域 设置在芯区域的中心，并且包围中心芯区域的外芯区域具有高于中心芯区域的平均折射率，并且芯区域具有比包层区域更高的平均折射率。

    Single-mode optical fiber floor long haul transmission
    46.
    发明授权
    Single-mode optical fiber floor long haul transmission 失效
    单模光纤地板长途传输

    公开(公告)号：US06532331B1

    公开(公告)日：2003-03-11

    申请号：US09698105

    申请日：2000-10-30

    Applicant: Takatoshi Kato ,  Masashi Onishi ,  Eisuke Sasaoka

    Inventor： Takatoshi Kato ,  Masashi Onishi ,  Eisuke Sasaoka

    IPC: G02B602

    CPC classification number: G02B6/03644 ,  G02B6/02014 ,  G02B6/02271 ,  G02B6/0283 ,  G02B6/03611 ,  G02B6/03627

    Abstract: The present invention relates to an optical fiber comprising a structure which effectively suppresses the occurrence of nonlinear phenomena without increasing transmission loss such as macrobending loss. The optical fiber according to the present invention comprises, radially in succession from the center axis thereof, a center region having a predetermined refractive index, a first annular region having a higher refractive index than the center region, and a second annular region doped with fluorine and having a lower refractive index than the first annular region. In particular, this optical fiber has an effective area of 70 &mgr;m2 or more with respect to light having a wavelength of 1550 nm, whereas the fluorine contents in the second annular region is adjusted such that the refractive index thereof decreases with distance from the center of the optical fiber.

    Abstract translation: 本发明涉及一种光纤，其包括有效抑制非线性现象的发生而不增加诸如宏弯损耗的传输损耗的结构。 根据本发明的光纤从其中心轴径向连续地包括具有预定折射率的中心区域，具有比中心区域更高的折射率的第一环形区域和掺杂有氟的第二环形区域 并且具有比第一环形区域更低的折射率。 特别地，该光纤相对于波长为1550nm的光具有70mum2以上的有效面积，而第二环状区域中的氟含量被调整为使得其折射率随着距离 光纤。

    Optical fiber and method of manufacturing the same
    48.
    发明授权
    Optical fiber and method of manufacturing the same 有权
    光纤及其制造方法

    公开(公告)号：US06449415B1

    公开(公告)日：2002-09-10

    申请号：US10051143

    申请日：2002-01-22

    Applicant: Eisuke Sasaoka

    Inventor： Eisuke Sasaoka

    IPC: G02B602

    CPC classification number: C03C13/046 ,  C03B37/01446 ,  C03B2201/12 ,  C03B2201/20 ,  C03B2203/22 ,  C03C3/06 ,  C03C13/045 ,  C03C2201/11 ,  C03C2201/12 ,  G02B6/02019 ,  G02B6/02257 ,  G02B6/02266 ,  G02B6/03627

    Abstract: This invention relates to an optical fiber having a structure that effectively reduces transmission loss and bending loss. An optical fiber according to this invention is an optical fiber mainly comprised of silica and including a core region and a cladding region covering the core region. The core region is doped with chlorine so as to have a refractive index higher than that of pure silica. The cladding region is doped with fluorine so as to have a refractive index lower than that of pure silica. The optical fiber, in particular, is characterized in that a peak value of a relative refractive index difference of the core region with respect to a refractive index of pure silica is 0.05% or more.

    Abstract translation: 本发明涉及具有有效降低传输损耗和弯曲损耗的结构的光纤。 根据本发明的光纤是主要由二氧化硅组成并且包括芯区域和覆盖芯区域的包层区域的光纤。 核心区域用氯掺杂，使其折射率高于纯二氧化硅的折射率。 掺杂氟的包层区域的折射率低于纯二氧化硅的折射率。 特别地，光纤的特征在于，核心区域相对于纯二氧化硅的折射率的相对折射率差的峰值为0.05％以上。

    Optical fiber
    49.
    发明授权
    Optical fiber 有权
    光纤

    公开(公告)号：US06345140B1

    公开(公告)日：2002-02-05

    申请号：US09613755

    申请日：2000-07-11

    Applicant: Eisuke Sasaoka ,  Shigeru Tanaka

    Inventor： Eisuke Sasaoka ,  Shigeru Tanaka

    IPC: G02B602

    CPC classification number: G02B6/03666 ,  G02B6/02009 ,  G02B6/02019 ,  G02B6/02242 ,  G02B6/02257 ,  G02B6/02261 ,  G02B6/02266 ,  G02B6/0281 ,  G02B6/03611 ,  G02B6/03627 ,  G02B6/03633

    Abstract: The present invention relates to an optical fiber having, at least, a structure for effectively restraining microbend loss from increasing. This optical fiber is an optical fiber suitable for a dispersion-flattened fiber, a dispersion-compensating fiber, and the like, and insured its single mode in a wavelength band in use. In particular, since the fiber diameter is 140 &mgr;m or more, this optical fiber has a high rigidity, so that the increase in microbend loss is effectively suppressed, whereas the probability of the optical fiber breaking due to bending stresses is practically unproblematic since the fiber diameter is 200 &mgr;m or less. Also, since this optical fiber has a larger mode field diameter, it lowers the optical energy density per unit cross-sectional area, thereby effectively restraining nonlinear optical phenomena from occurring.

    Abstract translation: 本发明涉及至少具有有效地抑制微弯损失增加的结构的光纤。 该光纤是适用于分散平坦化光纤，色散补偿光纤等的光纤，并且在使用的波长带中保证其单一模式。 特别是由于纤维直径为140μm以上，所以该光纤具有高刚性，有效地抑制了微弯损耗的增加，而由于弯曲应力而导致的光纤断裂的可能性实际上是不成问题的，因为纤维 直径为200μm以下。 此外，由于该光纤具有较大的模场直径，因此降低了每单位截面积的光能密度，从而有效地抑制非线性光学现象的发生。

    Optical fiber and optical transmission system including the same
    50.
    发明授权
    Optical fiber and optical transmission system including the same 有权
    光纤和光传输系统包括相同的

    公开(公告)号：US06266467B1

    公开(公告)日：2001-07-24

    申请号：US09580483

    申请日：2000-05-30

    Applicant: Takatoshi Kato ,  Eisuke Sasaoka ,  Shigeru Tanaka

    Inventor： Takatoshi Kato ,  Eisuke Sasaoka ,  Shigeru Tanaka

    IPC: G02B616

    CPC classification number: G02B6/036 ,  G02B6/02019 ,  G02B6/02223 ,  G02B6/02242 ,  G02B6/02271 ,  G02B6/0281 ,  G02B6/03611 ,  G02B6/03627 ,  G02B6/03633 ,  G02B6/03644 ,  G02B6/0365 ,  G02B6/03666

    Abstract: The present invention relates to an optical fiber which enables favorable optical communications in 1.3-&mgr;m and 1.55-&mgr;m wavelength bands, and an optical transmission system including the same. The optical fiber according to the present invention has only one zero-dispersion wavelength within a wavelength range of 1.20 &mgr;m to 1.60 &mgr;m, the zero-dispersion wavelength existing within a wavelength range of 1.37 &mgr;m to 1.50 &mgr;m, and has a positive dispersion slope at the zero-dispersion wavelength, thereby enabling favorable optical communications utilizing each signal light in the 1.3- &mgr;m and 1.55- &mgr;m wavelength bands sandwiching the zero-dispersion wavelength.

    Abstract translation: 本发明涉及能够在1.3μm和1.55μm波长带中实现良好的光通信的光纤，以及包括该光纤的光传输系统。 根据本发明的光纤在1.20μm至1.60μm的波长范围内仅具有一个零色散波长，零色散波长存在于1.37μm至1.50μm的波长范围内，并且具有正色散斜率 零色散波长，从而实现利用夹着零色散波长的1.3μm和1.55μm波长带中的每个信号光的有利的光通信。

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