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公开(公告)号：US20050134954A1
公开(公告)日：2005-06-23
申请号：US11009991
申请日：2004-12-10
申请人： Nobuhiro Fukushima , Hidenori Nakada , Tsugio Tokumasu , Yuko Ota
发明人： Nobuhiro Fukushima , Hidenori Nakada , Tsugio Tokumasu , Yuko Ota
CPC分类号： G02F1/09 , G02F2203/055
摘要： A variable optical filter comprises a first polarizer, a first phase difference element operable to generate a phase difference, a variable Faraday rotator operable to impart a variable Faraday rotation, a second phase difference element operable to generate a phase difference, and a second polarizer, wherein said polarizers, said variable Faraday rotator, and said phase difference elements are arranged in the mentioned order along the optical axis, and wherein when the angles formed by the optic axes of said first and second phase difference elements and the transmitted polarization azimuth of the first polarizer are assumed respectively to be φ1 and φ2, these φ1 and φ2 are set to different angles.
摘要翻译： 可变光学滤波器包括第一偏振器，可操作以产生相位差的第一相位差元件，可操作以赋予可变法拉第旋转的可变法拉第旋转器，可操作以产生相位差的第二相位差元件和第二偏振器， 其中所述偏振器，所述可变法拉第旋转器和所述相位差元件沿着光轴以所述次序布置，并且其中当由所述第一和第二相位差元件的光轴和所述第一和第二相位差元件的透射偏振方位角形成的角度 假设第一偏振器分别被假设为phi1和φ2，这些phi1＆lt; 1＆lt; 2＆gt;和＆lt; 2＆gt;被设置为 不同角度
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公开(公告)号：US07050216B2
公开(公告)日：2006-05-23
申请号：US11009991
申请日：2004-12-10
申请人： Nobuhiro Fukushima , Hidenori Nakada , Tsugio Tokumasu , Yuko Ota
发明人： Nobuhiro Fukushima , Hidenori Nakada , Tsugio Tokumasu , Yuko Ota
IPC分类号： G02F1/09
CPC分类号： G02F1/09 , G02F2203/055
摘要： A variable optical filter comprises a first polarizer, a first phase difference element operable to generate a phase difference, a variable Faraday rotator operable to impart a variable Faraday rotation, a second phase difference element operable to generate a phase difference, and a second polarizer, wherein said polarizers, said variable Faraday rotator, and said phase difference elements are arranged in the mentioned order along the optical axis, and wherein when the angles formed by the optic axes of said first and second phase difference elements and the transmitted polarization azimuth of the first polarizer are assumed respectively to be φ1 and φ2, these φ1 and φ2 are set to different angles.
摘要翻译： 可变光学滤波器包括第一偏振器，可操作以产生相位差的第一相位差元件，可操作以赋予可变法拉第旋转的可变法拉第旋转器，可操作以产生相位差的第二相位差元件和第二偏振器， 其中所述偏振器，所述可变法拉第旋转器和所述相位差元件沿着光轴以所述次序布置，并且其中当由所述第一和第二相位差元件的光轴和所述第一和第二相位差元件的透射偏振方位角形成的角度 假设第一偏振器分别被假设为phi1和φ2，这些phi1＆lt; 1＆lt; 2＆gt;和＆lt; 2＆gt;被设置为 不同角度
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公开(公告)号：US06876480B2
公开(公告)日：2005-04-05
申请号：US10343967
申请日：2001-07-25
IPC分类号： G02F1/09
CPC分类号： G02F1/09 , G02F1/093 , G02F2201/16 , G02F2203/04 , G02F2203/48
摘要： Optical devices including a Faraday rotation devices improved in wavelength and temperature characteristics and an optical attenuator reduced in wavelength dependence and temperature-dependent loss. The Faraday rotation device has permanent magnets magnetized in an axial direction of through-holes, and Faraday elements having a same Faraday rotation direction with respect to a same magnetization direction. The permanent magnets are directed in the same magnetization direction along an optical path, where part of the Faraday elements are accommodated in the through-hole of the permanent magnet, and the remaining Faraday elements are arranged between the magnets, whereby the Faraday elements are to be applied by magnetic fields in opposite directions. For a device variable in Faraday rotation angle, an electromagnet is provided. An input fiber collimator and polarizer are provided on an input side of with the Faraday elements while an analyzer and output fiber collimator are on an output side.
摘要翻译： 包括改善波长和温度特性的法拉第旋转装置和光衰减器的光学装置降低了波长依赖性和温度依赖性损失。 法拉第旋转装置具有沿通孔的轴向磁化的永久磁体，以及相对于相同磁化方向具有相同的法拉第旋转方向的法拉第元件。 永磁体沿着光路相同的磁化方向被引导，其中法拉第元件的一部分被容纳在永磁体的通孔中，并且剩余的法拉第元件被布置在磁体之间，由此法拉第元件将 通过相反方向的磁场施加。 对于法拉第旋转角度的装置变量，提供电磁体。 在法拉第元件的输入侧设置输入光纤准直器和偏振器，而分析器和输出光纤准直器位于输出侧。
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公开(公告)号：US07006273B2
公开(公告)日：2006-02-28
申请号：US11014085
申请日：2004-12-17
IPC分类号： G02F1/09
CPC分类号： G02F1/09 , G02F1/093 , G02F2201/16 , G02F2203/04 , G02F2203/48
摘要： Optical devices including a Faraday rotation devices improved in wavelength and temperature characteristics and an optical attenuator reduced in wavelength dependence and temperature-dependent loss. The Faraday rotation device has permanent magnets magnetized in an axial direction of through-holes, and Faraday elements having a same Faraday rotation direction with respect to a same magnetization direction. The permanent magnets are directed in the same magnetization direction along an optical path, where part of the Faraday elements are accommodated in the through-hole of the permanent magnet, and the remaining Faraday elements are arranged between the magnets, whereby the Faraday elements are to be applied by magnetic fields in opposite directions. For a device variable in Faraday rotation angle, an electromagnet is provided. An input fiber collimator and polarizer are provided on an input side of with the Faraday elements while an analyzer and output fiber collimator are on an output side.
摘要翻译： 包括改善波长和温度特性的法拉第旋转装置和光衰减器的光学装置降低了波长依赖性和温度依赖性损失。 法拉第旋转装置具有沿通孔的轴向磁化的永久磁体，以及相对于相同磁化方向具有相同的法拉第旋转方向的法拉第元件。 永磁体沿着光路相同的磁化方向被引导，其中法拉第元件的一部分被容纳在永磁体的通孔中，并且剩余的法拉第元件被布置在磁体之间，由此法拉第元件将 通过相反方向的磁场施加。 对于法拉第旋转角度的装置变量，提供电磁体。 在法拉第元件的输入侧设置输入光纤准直器和偏振器，而分析器和输出光纤准直器位于输出侧。
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公开(公告)号：US20050141075A1
公开(公告)日：2005-06-30
申请号：US11014085
申请日：2004-12-17
IPC分类号： G02F1/09
CPC分类号： G02F1/09 , G02F1/093 , G02F2201/16 , G02F2203/04 , G02F2203/48
摘要： Optical devices including a Faraday rotation devices improved in wavelength and temperature characteristics and an optical attenuator reduced in wavelength dependence and temperature-dependent loss. The Faraday rotation device has permanent magnets magnetized in an axial direction of through-holes, and Faraday elements having a same Faraday rotation direction with respect to a same magnetization direction. The permanent magnets are directed in the same magnetization direction along an optical path, where part of the Faraday elements are accommodated in the through-hole of the permanent magnet, and the remaining Faraday elements are arranged between the magnets, whereby the Faraday elements are to be applied by magnetic fields in opposite directions. For a device variable in Faraday rotation angle, an electromagnet is provided. An input fiber collimator and polarizer are provided on an input side of with the Faraday elements while an analyzer and output fiber collimator are on an output side.
摘要翻译： 包括改善波长和温度特性的法拉第旋转装置和光衰减器的光学装置降低了波长依赖性和温度依赖性损失。 法拉第旋转装置具有沿通孔的轴向磁化的永久磁体，以及相对于相同磁化方向具有相同的法拉第旋转方向的法拉第元件。 永磁体沿着光路相同的磁化方向被引导，其中法拉第元件的一部分被容纳在永磁体的通孔中，并且剩余的法拉第元件被布置在磁体之间，由此法拉第元件将 通过相反方向的磁场施加。 对于法拉第旋转角度的装置变量，提供电磁体。 在法拉第元件的输入侧设置输入光纤准直器和偏振器，而分析器和输出光纤准直器位于输出侧。
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公开(公告)号：US20130120824A1
公开(公告)日：2013-05-16
申请号：US13811043
申请日：2011-06-27
申请人： Hiroaki Ono , Hidenori Nakada , Hirotaka Kawai , Yuko Ota , Taro Nakamura
发明人： Hiroaki Ono , Hidenori Nakada , Hirotaka Kawai , Yuko Ota , Taro Nakamura
IPC分类号： G02F1/09
CPC分类号： G02F1/09 , G02B27/28 , G02F2203/02 , G02F2203/48
摘要： An input/output port, a birefringent element, variable polarization rotator, and a reflector are arranged along an optical axis in the order named. The variable polarization rotator includes permanent magnets for applying a fixed magnetic field to a Faraday rotator in an in-plane direction to magnetically saturate the Faraday rotator and a solenoid coil for applying a variable magnetic field to the Faraday rotator in a direction of the optical axis. A fixed magnetic field is applied in the direction, in which the Faraday rotator is likely to be magnetically saturated. The Faraday rotator can be saturated with a low magnetic field of about 100 Oe. The permanent magnets may employ ferrite permanent magnets, which have weak magnetic forces. A variable magnetic field may also be reduced. Therefore, an air-core coil can be used.
摘要翻译： 输入/输出端口，双折射元件，可变偏振旋转器和反射器按照所述顺序沿光轴布置。 可变偏振旋转器包括用于在面内方向上向法拉第旋转器施加固定磁场的永磁体，以使法拉第旋转器磁饱和;以及螺线管线圈，用于向法拉第旋转器沿光轴方向施加可变磁场 。 在<211>方向施加固定磁场，其中法拉第转子可能是磁饱和的。 法拉第转子可以用约100 Oe的低磁场饱和。 永磁体可以使用具有弱磁力的铁氧体永磁体。 也可以减小可变磁场。 因此，可以使用空心线圈。
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公开(公告)号：US07142362B2
公开(公告)日：2006-11-28
申请号：US10969195
申请日：2004-09-17
申请人： Hidenori Nakada , Shusuke Wada , Keisuke Ikeda , Yuko Ota
发明人： Hidenori Nakada , Shusuke Wada , Keisuke Ikeda , Yuko Ota
CPC分类号： G02B27/281
摘要： A low-cost compact optical attenuator structure has an input port and an output port for optical signals arranged side by side; a reflecting member arranged to face both ports to reverse light from the input side on an optical path folded 180°; a birefringence crystal splits incident light into two polarization components, a converging lens converges the incident light, a fixed Faraday rotator having a variable rotation angle arranged in that order in the optical path. The partial reflecting member that transmits a portion of incident light to the rear side thereof, an optical sensor at the rear side of the reflecting member, optical guide means guide only the transmitted light from the input port side to the optical sensor, and optical detection signals of the optical sensor are used as optical input monitoring signals.
摘要翻译： 低成本紧凑型光衰减器结构具有并排布置的用于光信号的输入端口和输出端口; 反射构件，被布置成面对两个端口以在180°的光路上反转来自输入侧的光; 双折射晶体将入射光分成两个偏振分量，会聚透镜会聚入射光，在光路中依次布置具有可变旋转角度的固定法拉第旋光器。 将入射光的一部分透射到其后侧的部分反射构件，反射构件的后侧的光学传感器，光导单元仅将从输入端侧向透过光引导到光学传感器， 光传感器的信号用作光输入监视信号。
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公开(公告)号：US20060061863A1
公开(公告)日：2006-03-23
申请号：US10969195
申请日：2004-09-17
申请人： Hidenori Nakada , Shusuke Wada , Keisuke Ikeda , Yuko Ota
发明人： Hidenori Nakada , Shusuke Wada , Keisuke Ikeda , Yuko Ota
IPC分类号： G02B5/30
CPC分类号： G02B27/281
摘要： A low-cost compact optical attenuator having a simple structure is constructed from an input port and an output port for optical signals arranged side by side; a reflecting member arranged to face both of the ports to reverse light from the input side on an optical path folded 180°; a birefringence crystal which splits incident light into two polarization components, a converging lens which converges the incident light, a fixed Faraday rotator having a fixed rotation angle, and a variable Faraday rotator having a variable rotation angle arranged in that order in the optical path; wherein the reflecting member is a partial reflecting member that transmits a portion of the incident light to the rear side thereof, an optical sensor is provided at the rear side of the reflecting member, optical guide means are provided to guide only the transmitted light from the input port side to the optical sensor, and optical detection signals of the optical sensor are used as optical input monitoring signals.
摘要翻译： 具有简单结构的低成本紧凑型光衰减器由并排布置的光信号的输入端口和输出端口构成; 反射构件，其布置成面对两个端口以在180°的光路上反转来自输入侧的光; 将入射光分为两个偏振分量的双折射晶体，会聚入射光的会聚透镜，具有固定旋转角度的固定法拉第旋转器和在光路中依次排列的具有可变旋转角度的可变法拉第旋转器; 其中所述反射部件是将入射光的一部分透射到其后侧的部分反射部件，在所述反射部件的后侧设置有光学传感器，所述光导部件设置成只引导来自所述反射部件的透射光 输入端口侧，光传感器的光检测信号用作光输入监视信号。
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公开(公告)号：US08854716B2
公开(公告)日：2014-10-07
申请号：US13811043
申请日：2011-06-27
申请人： Hiroaki Ono , Hidenori Nakada , Hirotaka Kawai , Yuko Ota , Taro Nakamura
发明人： Hiroaki Ono , Hidenori Nakada , Hirotaka Kawai , Yuko Ota , Taro Nakamura
CPC分类号： G02F1/09 , G02B27/28 , G02F2203/02 , G02F2203/48
摘要： An input/output port, a birefringent element, variable polarization rotator, and a reflector are arranged along an optical axis in the order named. The variable polarization rotator includes permanent magnets for applying a fixed magnetic field to a Faraday rotator in an in-plane direction to magnetically saturate the Faraday rotator and a solenoid coil for applying a variable magnetic field to the Faraday rotator in a direction of the optical axis. A fixed magnetic field is applied in the direction, in which the Faraday rotator is likely to be magnetically saturated. The Faraday rotator can be saturated with a low magnetic field of about 100 Oe. The permanent magnets may employ ferrite permanent magnets, which have weak magnetic forces. A variable magnetic field may also be reduced. Therefore, an air-core coil can be used.
摘要翻译： 输入/输出端口，双折射元件，可变偏振旋转器和反射器按照所述顺序沿光轴布置。 可变偏振旋转器包括用于在面内方向上向法拉第旋转器施加固定磁场的永磁体，以使法拉第旋转器磁饱和;以及螺线管线圈，用于向法拉第旋转器沿光轴方向施加可变磁场 。 在<211>方向施加固定磁场，其中法拉第转子可能是磁饱和的。 法拉第转子可以用约100 Oe的低磁场饱和。 永磁体可以使用具有弱磁力的铁氧体永磁体。 也可以减小可变磁场。 因此，可以使用空心线圈。
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公开(公告)号：US06288827B1
公开(公告)日：2001-09-11
申请号：US09259039
申请日：1999-02-26
IPC分类号： G02F109
CPC分类号： G02F1/09 , G02F1/093 , G02F2203/21
摘要： Disclosed is 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 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 &agr;, 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 &agr; 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： 公开了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，当外部磁场施加到法拉第元件时，该法拉第元件使通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 其中由于对角度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以及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关系，其中， 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。
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