Reduction of linear birefringence in circular-cored single-mode fiber

    公开(公告)号:US07120323B2

    公开(公告)日:2006-10-10

    申请号:US09921166

    申请日:2001-08-02

    CPC classification number: G02B6/3833 G02B6/105

    Abstract: A method is described for reducing the effect of linear birefringence in an optical fiber, in particular a circular-cored single-mode fiber. The invention may also be directed to an optical fiber having a reduced linear birefringence. A length of the optical fiber may be subdivided into a plurality of sections and a twist having a predetermined sense of rotation and a twist angle may be introduced between the sections. Fibers of this type may find applications, for example, in fiber-optic current and magnetic field sensors.

    Birefringent photonic bandgap optical waveguide
    53.
    发明申请
    Birefringent photonic bandgap optical waveguide 有权
    双折射光子带隙光波导

    公开(公告)号:US20060177187A1

    公开(公告)日:2006-08-10

    申请号:US10561594

    申请日:2004-06-21

    Abstract: A birefringent elongate waveguide for guiding light, comprises: a core region (110), comprising an elongate region of relatively low refractive index; and a cladding region (100), comprising elongate regions (105) of relatively low refractive index interspersed with elongate regions (117,120) of relatively high refractive index. In a transverse cross-section of the waveguide, a (5) relatively high refractive index boundary region (115) is provided that surrounds the core region and has either (1) at most two-fold rotational symmetry or (2) a rotational symmetry that reduces the rotational symmetry of the waveguide to at most two-fold rotational symmetry. The symmetry of the boundary region (115) results at least in part from azimuthal variations therein, which are substantially uncharacteristic of the cladding region (100).

    Abstract translation: 用于引导光的双折射细长波导包括:芯区(110),包括相对低折射率的细长区域; 和包层区域(100),包括相对较低折射率的细长区域(105),散射区域具有相对较高折射率的细长区域(117,120)。 在波导的横截面中,提供了(5)相对高折射率的边界区域(115),其围绕芯区域并且具有(1)至多两个旋转对称或(2)旋转对称 这将波导的旋转对称性降低到至多两个旋转对称。 边界区域(115)的对称性至少部分地由其中的方位角变化导致,这是包层区域(100)的基本上非特性。

    Polarization preserving optical fiber and absolute single polarization optical fiber
    56.
    发明授权
    Polarization preserving optical fiber and absolute single polarization optical fiber 有权
    极化保护光纤和绝对单极化光纤

    公开(公告)号:US07046887B2

    公开(公告)日:2006-05-16

    申请号:US10491068

    申请日:2002-09-26

    CPC classification number: G02B6/024 G02B6/02 G02B6/02338 G02B6/02357 G02B6/105

    Abstract: A polarization-maintaining optical fiber and absolutely single-polarization optical fiber are provided which enable long distance transmission maintaining a polarization state of signal light. The polarization-maintaining optical fiber includes a core, photonic crystal cladding, and jacket. The photonic crystal cladding is divided into four segments by broken lines from the center to the periphery. Among a plurality of grating holes in a pair of segments opposed to each other with respect to the core, the diameter of grating holes close to the core is greater than the diameter of grating holes in another pair of segments opposed with each other, and than a grating constant.

    Abstract translation: 提供了保持偏振的光纤和绝对单偏振光纤,其能够保持信号光的偏振状态的长距离传输。 偏振保持光纤包括芯,光子晶体包层和护套。 光子晶体包层由从中心到外围的虚线分成四段。 在相对于芯彼此相对的一对区段中的多个光栅孔中,靠近芯的光栅孔的直径大于彼此相对的另一对区段中的光栅孔的直径,并且比 光栅常数。

    Polarized wave scrambler and optical signal transmission apparatus
    58.
    发明授权
    Polarized wave scrambler and optical signal transmission apparatus 失效
    极化波扰频器和光信号传输装置

    公开(公告)号:US06947617B2

    公开(公告)日:2005-09-20

    申请号:US10291498

    申请日:2002-11-12

    Applicant: Isao Nakajima

    Inventor: Isao Nakajima

    CPC classification number: G02B6/2786 G02B6/105 G02B6/14 G02B6/274

    Abstract: A polarized wave scrambler and an optical signal transmission apparatus in which polarization mode dispersion is suppressed, and which has first and second polarization maintaining optical fibers, wherein respective constant components of a phase difference characteristic for optical frequencies between high-speed and low-speed axes of the first and the second polarization maintaining optical fibers are equal, and respective slopes for optical frequencies of the phase difference characteristics of the first and second polarization maintaining optical fibers are different. A plane of polarization of the linearly polarized optical signal is set to an angle between the high-speed axis and the low-speed axis of the first polarization maintaining optical fiber and the linearly polarized optical signal is supplied to the first polarization maintaining optical fiber. Further, the first and the second polarization maintaining optical fibers are spliced such that the high-speed axis of the first, corresponds to the low-speed axis of the second, polarization maintaining optical fiber, and the low-speed axis of the first, corresponds to the high-speed axis of the second, polarization maintaining optical fiber.

    Abstract translation: 偏振波扰乱器和光信号传输装置,其中抑制了偏振模色散,并且具有第一和第二偏振保持光纤,其中高速和低速轴之间的光频率的相位差特性的各个恒定分量 第一和第二偏振维持光纤相等,并且第一和第二偏振维持光纤的相位差特性的光频率的各个斜率不同。 线偏振光信号的偏振平面被设定为第一偏振光保持光纤的高速轴和低速轴之间的角度,并且线偏振光信号被提供给第一保偏光纤。 此外,第一和第二偏振保持光纤被拼接,使得第一和第二偏振保持光纤的高速轴对应于第二偏振保持光纤的低速轴, 对应于第二个保偏光纤的高速轴。

    Current sensor
    60.
    发明授权
    Current sensor 失效
    电流传感器

    公开(公告)号:US06891622B2

    公开(公告)日:2005-05-10

    申请号:US09930738

    申请日:2001-08-15

    Inventor: Richard B. Dyott

    Abstract: A method and device for measuring the current in a conductor are presented. They utilize the Faraday effect on counter-propagating circularly polarized beams of light in a fiber optic coil. The light beams are transformed to and from circular polarization by a polarization transformer comprised of a birefringent fiber with a twist through an appropriate angle at an appropriate distance from one end.

    Abstract translation: 介绍了一种用于测量导体中电流的方法和装置。 它们利用法拉第效应对光纤线圈中反向传播的圆偏振光束的光。 通过由双折射光纤组成的偏振变换器将光束转换成圆偏振,并从其一端以适当的距离通过适当的角度进行扭转。

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