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    Faraday rotator
    2.
    发明公开
    Faraday rotator 有权
    法拉第旋转器

    公开(公告)号：EP0940704A2

    公开(公告)日：1999-09-08

    申请号：EP99301583.3

    申请日：1999-03-03

    申请人： FDK Corporation ,  FUJITSU LIMITED

    发明人： Kawai, Hirotaka ,  Umezawa, Hiromitsu ,  Nakada, Hidenori ,  Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G02F1/09

    CPC分类号： G02F1/09 ,  G02F1/093 ,  G02F2203/21

    摘要： The present invention relates to a Faraday rotator capable of reducing the temperature dependence on a Faraday rotation angle, thereby enhancing the temperature characteristic, particularly, in a service environment in which the magnetization direction is variable, and an optical device using the Faraday rotator. The Faraday rotator includes a Faraday element (33) which rotates the polarization plane of polarized light rays passing through the Faraday element when an external magnetic field is applied to the Faraday element. In this Faraday rotator, assuming that an angle between a magnetization direction of the Faraday element and a light ray direction is taken as α, the amount of the temperature-dependent change in Faraday rotation angle is reduced by applying the external magnetic field in a direction in which a first amount of the change in Faraday rotation angle due to the temperature dependence on the angle a and a second amount of the change in Faraday rotation angle due to the temperature dependence on the Faraday effect satisfy a relationship in which the sign of the first amount is plus or minus, the sign of the second amount is minus or plus, and the absolute value of one of the first and second amounts is less than twice the absolute value of the other amount, more preferably, substantially equal to the absolute value of the other amount.

    摘要翻译： 本发明涉及能够降低与法拉第旋转角度的温度依赖性的法拉第旋转器，从而提高温度特性，特别是在磁化方向可变的使用环境中，以及使用法拉第旋转器的光学装置。 法拉第旋转器包括法拉第元件（33），当外部磁场施加到法拉第元件时，该法拉第元件（33）使穿过法拉第元件的偏振光的偏振面旋转。 在该法拉第旋转器中，假设法拉第元件的磁化方向与光线方向之间的角度为α，则法拉第旋转角度的温度依赖的变化量通过将外部磁场施加在方向 其中由于与角度α的温度依赖性而导致的法拉第旋转角度的第一量的变化和由于对法拉第效应的温度依赖性而产生的法拉第旋转角度的第二量的变化满足下述关系： 第一数量是正负号，第二数量的符号是负数或正数，第一和第二数量之一的绝对值小于其他量的绝对值的两倍，更优选地基本上等于绝对值 其他金额的价值。

    Optical device for wavelength monitoring and wavelength control
    3.
    发明公开
    Optical device for wavelength monitoring and wavelength control 失效
    Optische Vorrichtung zurWellenlängenüberwachungund Kontrolle

    公开(公告)号：EP0911621A2

    公开(公告)日：1999-04-28

    申请号：EP98301916.7

    申请日：1998-03-13

    申请人： FUJITSU LIMITED

    发明人： Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G01J9/00

    CPC分类号： G01J9/00

    摘要： An optical device (4) has an optical element (54) having a first surface (54A) and a second surface (54B) not parallel to each other. The optical element separates a light beam (CB) supplied to the first surface (54A) into a first beam (CB1) reflected on the first surface (54A), a second beam (CB2) passed through the first surface (54A), reflected on the second surface (54B), and passed through the first surface (54) again, and a third beam (CB3) passed through the first surface (54A) and the second surface (54B) in this order. An optical filter (56) is provided to transmit the first and second beams (CB1,CB2). The optical filter (56) has wavelength characteristics different according to an incidence angle. The first and second beams (CB1,CB2) passed through the optical filter (56) are supplied to first and second photodetectors (60,62), respectively. On the basis of the difference in wavelength characteristic, the wavelength of the light beam (CB) can be monitored according to outputs from the first and second photodetectors (60,62).

    摘要翻译： 光学装置（4）具有光学元件（54），其具有彼此不平行的第一表面（54A）和第二表面（54B）。 光学元件将提供给第一表面（54A）的光束（CB）分离成在第一表面（54A）上反射的第一光束（CB1），穿过第一表面（54A）的第二光束（CB2） 在第二表面（54B）上再次通过第一表面（54），并且第三束（CB3）依次穿过第一表面（54A）和第二表面（54B）。 提供一个滤光器（56）来传输第一和第二光束（CB1，CB2）。 滤光器（56）具有根据入射角不同的波长特性。 通过滤光器（56）的第一和第二光束（CB1，CB2）分别被提供给第一和第二光电检测器（60,62）。 基于波长特性的差异，可以根据来自第一和第二光电检测器（60,62）的输出来监视光束（CB）的波长。

    Optical attenuator
    5.
    发明公开
    Optical attenuator 失效
    光衰减器

    公开(公告)号：EP0932067A2

    公开(公告)日：1999-07-28

    申请号：EP98112558.6

    申请日：1998-07-07

    申请人： FUJITSU LIMITED

    发明人： Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G02F1/09

    CPC分类号： G02F1/09 ,  G02F2201/16 ,  G02F2203/04 ,  G02F2203/48

    摘要： The present invention relates to an optical attenuator comprising first and second attenuator units cascaded on an optical path, and a control circuit connected to the first and second attenuator units. Each of the first and second attenuator units includes a Faraday rotator provided on the optical path. The Faraday rotator generates a Faraday rotation angle given as a function of wavelength. Each of the first and second attenuator units further includes polarizing unit for generating an attenuation determined by the Faraday rotation angle on the optical path. The control circuit, for example, controls the Faraday rotation angle in each of the first and second attenuator units so that a wavelength characteristic of attenuation in the first attenuator unit is substantially canceled by a wavelength characteristic of attenuation in the second attenuator unit. With this configuration, although each Faraday rotator generates a Faraday rotation angle given as a function of wavelength, a wavelength characteristic of total attenuation is substantially flattened by the operation of the control circuit.

    摘要翻译： 本发明涉及一种光衰减器，其包括级联在光路上的第一和第二衰减器单元以及连接到第一和第二衰减器单元的控制电路。 第一和第二衰减器单元中的每一个包括设置在光路上的法拉第旋转器。 法拉第旋转器产生作为波长函数的法拉第旋转角。 第一衰减器单元和第二衰减器单元中的每一个还包括用于产生由光路上的法拉第旋转角度确定的衰减的偏振单元。 控制电路例如控制第一和第二衰减器单元中的每一个中的法拉第旋转角度，使得第一衰减器单元中的衰减的波长特性基本上被第二衰减器单元中的衰减的波长特性抵消。 利用这种配置，尽管每个法拉第旋转器产生作为波长的函数给出的法拉第旋转角，但是通过控制电路的操作，总衰减的波长特性基本上被平坦化。

    Tunable optical filter
    8.
    发明公开
    Tunable optical filter 有权
    Abstimmbares optisches过滤器

    公开(公告)号：EP0932068A2

    公开(公告)日：1999-07-28

    申请号：EP98114541.0

    申请日：1998-08-03

    申请人： FUJITSU LIMITED

    发明人： Terahara, Takafumi, c/o Fujitsu Limited ,  Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G02F1/09 ,  H01S3/06

    CPC分类号： G02F1/09 ,  G02F1/0121 ,  G02F2203/05 ,  G02F2203/055 ,  H01S3/06754 ,  H01S2301/04

    摘要： The present invention relates to a tunable optical filter having a variable wavelength characteristic of transmittance. The tunable optical filter includes first and second polarizers each having a transmission axis determining a polarization axis of transmitted polarized light, a birefringent element having an optic axis determining a phase difference given between two orthogonal components of transmitted polarized light, and a Faraday rotator for giving a variable Faraday rotation angle to transmitted polarized light. The birefringent element and the Faraday rotator are provided between the first and second polarizers. The order of arrangement of the birefringent element and the Faraday rotator, and the relative positional relation between the optic axis of the birefringent element and the transmission axis of each polarizer are set so that the shape of a characteristic curve giving a wavelength characteristic of transmittance changes along a transmittance axis according to a change in the Faraday rotation angle.

    摘要翻译： 本发明涉及具有透射率的可变波长特性的可调谐滤光器。 可调光滤波器包括第一和第二偏振器，每个具有确定透射偏振光的偏振轴的透射轴，双折射元件，其具有确定在透射偏振光的两个正交分量之间给出的相位差的光轴和用于给出的法拉第旋转器 对透射偏振光的可变法拉第旋转角度。 双折射元件和法拉第旋转器设置在第一和第二偏振器之间。 双折射元件和法拉第旋转器的布置顺序以及双折射元件的光轴与每个偏振片的透射轴之间的相对位置关系被设定为使得透射率的波长特性的特性曲线的形状变化 根据法拉第旋转角度的变化沿着透射轴。

    Optical circulator
    9.
    发明公开
    Optical circulator 失效
    光学循环器

    公开(公告)号：EP0848278A1

    公开(公告)日：1998-06-17

    申请号：EP97305104.8

    申请日：1997-07-10

    申请人： FUJITSU LIMITED

    发明人： Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G02F1/09 ,  G02B6/26

    CPC分类号： G02B6/2746 ,  G02F1/093

    摘要： An optical device having a function of an optical circulator of which forward losses are uniformly small wihle reverse losses are uniformly great. The optical device applicable to be used as an improved three-port optical circulator has three optical coupling units (30) connected optically to three ports (1,2,3) respectively, a reflecting unit (32) for giving a polarization plane rotation of 90° to an input beam, and a main polarization beam splitter (40) having a polarized-wave separating film (38) for optically connecting the optical coupling units (30) and the reflecting unit (32) through transmission and reflection. Each of the optical coupling units (30) comprises a subsidiary polarization beam splitter (46) and a polarization converter (48). The subsidiary polarization beam splitter (46) couples the relevant port (1,2,3) to first and second polarized beams perpendicular to each other. The polarization converter (48) converts the polarization state of one of the first and second polarized beams in such a manner that the first and second polarized beams are transmitted through or reflected by the polarized-wave separating film (38) in accordance with the directions of the beams.

    摘要翻译： 具有光纤环行器的功能的光学器件的前向损耗均匀小而反向损耗均匀很大。 适用于改进的三端口光环行器的光学装置具有分别与三个端口（1,2,3）光学连接的三个光学耦合单元（30），用于给出偏振面旋转的反射单元（32） 90°的主偏振分束器，以及具有用于通过透射和反射光学地连接光耦合单元（30）和反射单元（32）的偏振波分离膜（38）的主偏振分束器（40）。 每个光耦合单元（30）包括辅偏振分束器（46）和偏振转换器（48）。 辅助偏振分束器（46）将相关端口（1,2,3）耦合到彼此垂直的第一和第二偏振光束。 偏振转换器（48）以这样的方式转换第一和第二偏振光束之一的偏振状态，使得第一和第二偏振光束根据方向透射或者被偏振分离膜（38）反射 的横梁。