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33 条记录 (耗时 0.011 秒)

    Polarization insensitive microbend fiber gratings and devices using the same
    2.
    发明公开
    Polarization insensitive microbend fiber gratings and devices using the same 有权
    Polarisationsunempfindliche optische Faser

    公开(公告)号：EP1628148A1

    公开(公告)日：2006-02-22

    申请号：EP05013278.6

    申请日：2005-06-20

    申请人： FITEL USA CORPORATION (a Delaware Corporation)

    发明人： Ramachandran, Siddharth

    IPC分类号： G02B6/02 ,  G02B6/036

    CPC分类号： G02B6/02071 ,  G02B6/02109 ,  G02B6/03644

    摘要： A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit "splitting" between the resonant wavelengths supported by the TE and TM components of the LP 1m mode and the resonant wavelength supported by the odd/even HE 2m components of the LP 1m mode. Since only the TE and TM components are polarization dependent, by splitting and shifting the resonant wavelengths for these modes away from a system-desired wavelength(s) supported by the odd/even HE modes, a polarization insensitive microbend-induced fiber grating can be formed. A fiber core configuration including a central core region, trench and ring is formed to exhibit a large radial gradient in core refractive index profile, with a significantly steep transition between the ring index and the trench index, to provide the desired splitting between the (undesired, polarization sensitive) TE/TM modes and the HE mode.

    摘要翻译： 微弯引起的光纤光栅由一部分光纤形成，该部分被配置为在由LP1m模式的TE和TM分量支持的谐振波长之间显示“分裂”，并且由奇偶/偶数HE 2m分量支持的谐振波长 LP 1m模式。 由于只有TE和TM分量是偏振相关的，通过将这些模式的谐振波长分裂和移位远离由奇/偶HE模支持的系统期望的波长，偏振不敏感微弯折感光纤光栅可以是 形成。 形成包括中心芯区域，沟槽和环的纤维芯构型以在纤芯折射率分布中表现出大的径向梯度，在环索引和沟槽指数之间具有显着陡峭的转变，从而在（不期望的） ，极化敏感）TE / TM模式和HE模式。

    FIBER-OPTIC FREQUENCY SHIFTER, OPTICAL INTERFEROMETER AND METHOD OF GENERATING TWO COMPLEMENTARY OPTICAL INTERFERENCE SIGNALS USING THE SAME
    3.
    发明公开
    FIBER-OPTIC FREQUENCY SHIFTER, OPTICAL INTERFEROMETER AND METHOD OF GENERATING TWO COMPLEMENTARY OPTICAL INTERFERENCE SIGNALS USING THE SAME 审中-公开
    光纤频率滑块，其制造两个互补的光学INFERFEREZSIGNALE的方法，光干涉和使用

    公开(公告)号：EP0991925A1

    公开(公告)日：2000-04-12

    申请号：EP99912134.6

    申请日：1999-03-30

    申请人： Korea Advanced Institute of Science and Technology ,  Donam Systems Inc.

    发明人： KIM, Byoung, Yoon ,  LEE, Wang, Joo ,  KIM, Bong, Kyu

    IPC分类号： G01J9/00 ,  G02B6/02 ,  G01B11/02

    CPC分类号： G02B6/02071 ,  G01B9/02003 ,  G01B2290/70 ,  G01J9/00 ,  G02B6/105 ,  G02B6/14 ,  G02B6/29353 ,  G02B6/29397 ,  G02F1/0134 ,  G02F2/02

    摘要： This invention relates to optical devices such as a fiber-optic frequency shifter and an optical interferometer. This invention also relates to a method of generating optical interference signals to obtain reliable sensor signals independent of polarization fluctuations of the optical waves in the fiber. Fiber-optic interferometers have many advantages such as high sensitivity and convenient way of using even in poor surrounding environments. These interferometer, however, exhibit polarization dependent signal degradation since the polarization of a light wave passing through an optical fiber irregularly changes depending on the birefringence of the fiber. This invention is characterized in that the frequencies of two orthogonal eigen polarizations of a light wave are shifted to different frequency values at one optical path of the interferometer. They produce two beat interference signals after interfering with the light wave passed through the other optical paht of the interferometer. The two beat interference signals have amplitudes varying complementarily. Selecting the larger one from the two beat signals can prevent polarization dependent signal degradation. Moreover, the beat signals from the optical interferometer according to the invention requires simpler signal processing compared to the output of conventional fiber-optic interferometer.

    Coupling device for single mode optical fiber and communications system comprising same
    4.
    发明公开
    Coupling device for single mode optical fiber and communications system comprising same 失效
    用于单模光纤的耦合装置和包含其的通信系统

    公开(公告)号：EP0221560A3

    公开(公告)日：1989-09-13

    申请号：EP86115406.0

    申请日：1986-11-06

    申请人： AT&T Corp.

    发明人： Aberson, James Ashley, Jr. ,  White, Ian Arthur

    IPC分类号： H04B10/00 ,  G02B6/34 ,  G02F1/01

    CPC分类号： G02B6/02095 ,  G02B6/02071 ,  G02B6/02119 ,  G02B6/02133 ,  G02B6/14 ,  G02B6/29311 ,  G02B6/29314 ,  G02B6/29317 ,  G02B6/29344 ,  G02B6/4215 ,  G02F1/0126 ,  G02F1/0134 ,  G02F1/0541

    摘要： Optical radiation can be efficiently removed from, or injected into, single mode optical fiber at an intermediate point along the fiber, by causing quasi-resonant coupling of the guided mode LP 01 to an appropriate tunneling leaky (TL) mode, e.g., LP 11 . Such coupling is caused by means of a "grating" in the fiber, with the grating being formed by impressing a periodic (or pseudo-periodic) modulation on the fiber, or by causing a periodic (or pseudo-periodic) variation of the refractive index of the fiber by means of the photoelastic or the photorefractive effect. The nominal grating spacing ^(z) is chosen such that O o = (2π/ ) > β 01 -2πn cl ^ o , where w is the average grating spacing, β 01 , is the propagation constant of the LP 01 mode, n cl is the refractive index of the fiber cladding, and o is the wavelength of the radiation to be coupled from or into the fiber. Furthermore, ^(z) is to be chosen such that O o β 01 , - β rs , where β rs is the propagation constant of the selected TL mode. In order for the coupling to be quasi-resonant, it is necessary that α rs , the attenuation constant of the selected TL mode, be relatively small, typically

    Apparatus for optically pumping an optical fiber from the side
    8.
    发明公开
    Apparatus for optically pumping an optical fiber from the side 有权
    Vorrichtung zum seitlichen optischen Pumpen einer optischen Faser

    公开(公告)号：EP1065764A2

    公开(公告)日：2001-01-03

    申请号：EP00111944.5

    申请日：2000-06-15

    申请人： TRW Inc.

    发明人： Heflinger, Donald G. ,  Wickham, Michael G. ,  Holleman, Gerald W.

    IPC分类号： H01S3/098 ,  H01S3/067 ,  G02B6/42

    CPC分类号： G02B6/4214 ,  G02B6/02061 ,  G02B6/02066 ,  G02B6/02071 ,  G02B6/2852 ,  G02B6/34 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094019

    摘要： An apparatus (10) for optically pumping an optical fiber (16) from the side comprising a laser (12) for supplying a beam of pump light (14), and an optical fiber (16) having a longitudinal surface disposed to the beam (14), a grating (34) formed in the flat surface (26) for diffracting the beam (14) at a predetermined angle, and an outer clad layer (22) proximate the grating (34) and so as to establish at least one propagating mode characterized by an angle, the predetermined angle being matched to such angle.

    摘要翻译： 一种用于从包括用于提供一束泵浦光（14）的激光器（12）的一侧光学泵浦光纤（16）的装置（10），以及一个具有设置在该光束上的纵向表面的光纤（16） 形成在用于以预定角度衍射光束（14）的平坦表面（26）中的光栅（34）和靠近光栅（34）的外包层（22），以便建立至少一个 以角度为特征的传播模式，该预定角度与该角度相匹配。