公开(公告)号：US20050094272A1

公开(公告)日：2005-05-05

申请号：US10821857

申请日：2004-04-12

申请人： Norihisa Naganuma ,  Nobuaki Mitamura ,  Shinji Maruyama ,  Hiroshi Nagaeda ,  Hirotomo Izumi

发明人： Norihisa Naganuma ,  Nobuaki Mitamura ,  Shinji Maruyama ,  Hiroshi Nagaeda ,  Hirotomo Izumi

IPC分类号： G02B26/00 ,  G02B5/18 ,  G02B5/28 ,  G02B6/34 ,  H04J14/02

CPC分类号： G02B6/29358 ,  G02B6/2937 ,  G02B6/29395 ,  H04B10/25073 ,  H04J14/02

摘要： Light emitted from an optical fiber is collimated by a collimating lens. An optical filter with a slit is placed in the path of the collimated light. The slit can be moved along a direction perpendicular to the path of the collimated light. When the slit is on the center of the collimated beam, because the intensity of light is high at the center, the diffraction loss of the light is high. When the slit is on the edge, because the light intensity is low at the edge, the diffraction loss is low. The diffraction loss has a wavelength characteristic and can be controlled by adjusting the position of the slit in the collimated beam.

摘要翻译： 由光纤发射的光被准直透镜准直。 具有狭缝的滤光器被放置在准直光的路径中。 狭缝可以沿着与准直光的路径垂直的方向移动。 当狭缝位于准直光束的中心时，由于光的中心强度高，所以光的衍射损耗高。 当狭缝在边缘上时，由于边缘处的光强度低，所以衍射损耗低。 衍射损耗具有波长特性，并且可以通过调整准直光束中的狭缝的位置来控制。

公开(公告)号：US06826318B2

公开(公告)日：2004-11-30

申请号：US10061307

申请日：2002-02-04

申请人： Hiroshi Nagaeda ,  Nobuaki Mitamura ,  Kazuaki Akimoto

发明人： Hiroshi Nagaeda ,  Nobuaki Mitamura ,  Kazuaki Akimoto

IPC分类号： G02B600

CPC分类号： G02B6/29302 ,  G02B6/266 ,  G02B6/272 ,  G02B6/2766 ,  G02B27/286 ,  G02F1/0136 ,  G02F2201/17 ,  G02F2203/48

摘要： An optical device includes a small and low-cost variable polarization plane rotator that can control a rotation angle of the polarization plane easily. A variable polarization plane rotator is provided with a &lgr;/4 phase plate having an optical axis in the same direction as, or at a 90 degree angle relative to, a polarization direction of an input light beam. A phase difference variable element has an optical axis at a ±45 degree angle relative to the optical axis of the &lgr;/4 phase plate, to apply a variable phase difference between the polarization components parallel to and perpendicular to the optical axis thereof. A phase difference adjustment section adjusts the variable phase difference of the phase difference variable element, wherein the input light beam after being transmitted through the phase difference variable element to form elliptically polarized light or circularly polarized light, is transmitted through the &lgr;/4 phase plate to form linearly polarized light. The polarization plane of the input light beam is rotated by an angle corresponding to the phase difference applied by the phase difference variable element.

摘要翻译： 光学装置包括可以容易地控制偏振面的旋转角度的小而低成本的可变偏振面旋转器。 可变偏振面旋转体设置有λ/ 4相位板，其具有与输入光束的偏振方向相同的方向或相对于输入光束的偏振方向成90度角的光轴。 相位差可变元件相对于λ/ 4相位板的光轴具有±45度角的光轴，以在平行于其并垂直于其光轴的偏振分量之间施加可变相位差。 相位差调整部分调节相位差可变元件的可变相位差，其中通过相位差可变元件传输以形成椭圆偏振光或圆偏振光的输入光束透射通过λ/ 4相位板 以形成线偏振光。 输入光束的偏振平面旋转与由相位差可变元件施加的相位差对应的角度。

公开(公告)号：US06931165B2

公开(公告)日：2005-08-16

申请号：US10974780

申请日：2004-10-28

申请人： Hiroshi Nagaeda ,  Nobuaki Mitamura ,  Kazuaki Akimoto

发明人： Hiroshi Nagaeda ,  Nobuaki Mitamura ,  Kazuaki Akimoto

IPC分类号： G02B6/32 ,  G02B5/30 ,  G02B6/26 ,  G02B6/34 ,  G02B27/28 ,  G02F1/01 ,  G02F1/03 ,  G02F1/061 ,  G02F1/13 ,  G02F1/31 ,  G02B6/00

CPC分类号： G02B6/29302 ,  G02B6/266 ,  G02B6/272 ,  G02B6/2766 ,  G02B27/286 ,  G02F1/0136 ,  G02F2201/17 ,  G02F2203/48

摘要： An optical device includes a small and low-cost variable polarization plane rotator that can control a rotation angle of the polarization plane easily. A variable polarization plane rotator is provided with a λ/4 phase plate having an optical axis in the same direction as, or at a 90 degree angle relative to, a polarization direction of an input light beam. A phase difference variable element has an optical axis at a ±45 degree angle relative to the optical axis of the λ/4 phase plate, to apply a variable phase difference between the polarization components parallel to and perpendicular to the optical axis thereof. A phase difference adjustment section adjusts the variable phase difference of the phase difference variable element, wherein the input light beam after being transmitted through the phase difference variable element to form elliptically polarized light or circularly polarized light, is transmitted through the λ/4 phase plate to form linearly polarized light. The polarization plane of the input light beam is rotated by an angle corresponding to the phase difference applied by the phase difference variable element.

摘要翻译： 光学装置包括可以容易地控制偏振面的旋转角度的小而低成本的可变偏振面旋转器。 可变偏振面旋转体设置有λ/ 4相位板，其具有与输入光束的偏振方向相同的方向或相对于输入光束的偏振方向成90度角的光轴。 相位差可变元件相对于λ/ 4相位板的光轴具有±45度角的光轴，以在平行于其并垂直于其光轴的偏振分量之间施加可变相位差。 相位差调整部分调节相位差可变元件的可变相位差，其中通过相位差可变元件传输以形成椭圆偏振光或圆偏振光的输入光束透射通过λ/ 4相位板 以形成线偏振光。 输入光束的偏振平面旋转与由相位差可变元件施加的相位差对应的角度。

公开(公告)号：US20050046837A1

公开(公告)日：2005-03-03

申请号：US10792747

申请日：2004-03-05

申请人： Hirotomo Izumi ,  Hiroshi Nagaeda ,  Nobuaki Mitamura

发明人： Hirotomo Izumi ,  Hiroshi Nagaeda ,  Nobuaki Mitamura

IPC分类号： G01J3/12 ,  G01J3/18 ,  G01J3/26 ,  G01J3/28 ,  G02B6/34 ,  G02B26/00 ,  G02B27/00 ,  G02B27/14 ,  G02F1/01 ,  G02F1/03

CPC分类号： G02B6/4246 ,  G01J3/0208 ,  G01J3/0286 ,  G01J3/18 ,  G01J3/26 ,  G01J3/2803 ,  G01J2003/1247 ,  G02B6/29311 ,  G02B6/29358 ,  G02B6/29373 ,  G02B6/29395 ,  G02B27/0087 ,  G02B27/1086 ,  G02B27/144 ,  G02F1/0147 ,  G02F1/03 ,  G02F2201/17 ,  G02F2203/055

摘要： A spectroscopic apparatus which is compact in size and performs high-precision light-splitting with a large angular dispersion. An optical input-processing section outputs a filtered transmitted light, using a bandpass filter that transmits only wavelength bands at one period of an input light, and collects the filtered transmitted light to generate a collected beam. An optic includes a first reflection surface and a second reflection surface which are high but asymmetric in reflectivity, and causes the collected beam incident thereon to undergo multiple reflections within an inner region between the first reflection surface and the second reflection surface, to thereby cause split beams to be emitted via the second reflection surface. A received light-processing section performs received light processing of the beams emitted from the optic. A control section variably controls at least one of a filter characteristic of the bandpass filter and an optical length through the optic.

摘要翻译： 一种尺寸紧凑并且具有大角度色散的高精度光分裂的分光装置。 光输入处理部分使用在输入光的一个周期仅发送波长带的带通滤波器来输出经滤波的透射光，并且收集被滤波的透射光以产生收集的光束。 光学元件包括反射率高但不对称的第一反射表面和第二反射表面，并且使入射到其上的收集的光束在第一反射表面和第二反射表面之间的内部区域内经历多次反射，从而导致分裂 经由第二反射面发射的光束。 接收到的光处理部分执行从光学元件发射的光束的接收光处理。 控制部分可变地控制带通滤波器的滤波器特性和通过光学器件的光学长度中的至少一个。

公开(公告)号：US06829053B1

公开(公告)日：2004-12-07

申请号：US09697179

申请日：2000-10-27

申请人： Nobuaki Mitamura ,  Hiroshi Nagaeda

发明人： Nobuaki Mitamura ,  Hiroshi Nagaeda

IPC分类号： G02B110

CPC分类号： G02B26/001 ,  G02B6/29358 ,  G02B6/29395

摘要： An airgap type etalon has a higher degree of design freedom of a wavelength-temperature characteristic so that such a wavelength-temperature characteristic can be freely adjusted. The airgap type etalon includes a fixing block having one flat surface, and a transparent parallel flat plate having parallel flat surfaces formed with an antireflection coating and a reflection augmenting coating thereon, respectively. The flat surface at the antireflection coating side is joined to the flat surface of the fixing block. A parallel flat spacer has a thickness greater than that of the transparent parallel flat plate and an expansion coefficient different from that of the transparent parallel flat plate. One of the flat surfaces of the parallel flat spacer is joined to the flat surface of the fixing block. A transparent flat plate has opposite flat surfaces formed with an antireflection coating and a reflection augmenting coating thereon, respectively. The flat surface at the reflection augmenting coating side is joined to the other of the flat surfaces of the parallel flat spacer, wherein a Fabry-Perot interferometer is formed based on an airgap positioned between the flat surface of the transparent parallel flat plate and the flat surface of the transparent flat plate, which flat surfaces face each other.

摘要翻译： 气隙型标准具具有较高的波长温度特性的设计自由度，使得可以自由调节这种波长温度特性。 空隙型标准具包括具有一个平坦表面的固定块和分别具有平坦平面的透明平行平板，其上形成有防反射涂层和反射增强涂层。 抗反射涂层侧的平坦表面与固定块的平坦表面接合。 平行的平面间隔物的厚度大于透明平行平板的厚度，并且与透明平行平板的膨胀系数不同。 平行平面间隔件的平坦表面之一与固定块的平坦表面接合。 透明平板分别具有形成有抗反射涂层和反射增强涂层的相对的平坦表面。 反射增强涂层侧的平坦表面与平行平面间隔物的另一个平坦表面接合，其中基于位于透明平行平板的平坦表面和平面之间的气隙形成法布里 - 珀罗干涉仪 该平坦表面彼此面对的透明平板的表面。

公开(公告)号：US20050084198A1

公开(公告)日：2005-04-21

申请号：US10974780

申请日：2004-10-28

申请人： Hiroshi Nagaeda ,  Nobuaki Mitamura ,  Kazuaki Akimoto

发明人： Hiroshi Nagaeda ,  Nobuaki Mitamura ,  Kazuaki Akimoto

IPC分类号： G02B6/32 ,  G02B5/30 ,  G02B6/26 ,  G02B6/34 ,  G02B27/28 ,  G02F1/01 ,  G02F1/03 ,  G02F1/061 ,  G02F1/13 ,  G02F1/31 ,  G02B6/00

CPC分类号： G02B6/29302 ,  G02B6/266 ,  G02B6/272 ,  G02B6/2766 ,  G02B27/286 ,  G02F1/0136 ,  G02F2201/17 ,  G02F2203/48

摘要： An optical device includes a small and low-cost variable polarization plane rotator that can control a rotation angle of the polarization plane easily. A variable polarization plane rotator is provided with a λ/4 phase plate having an optical axis in the same direction as, or at a 90 degree angle relative to, a polarization direction of an input light beam. A phase difference variable element has an optical axis at a ±45 degree angle relative to the optical axis of the λ/4 phase plate, to apply a variable phase difference between the polarization components parallel to and perpendicular to the optical axis thereof. A phase difference adjustment section adjusts the variable phase difference of the phase difference variable element, wherein the input light beam after being transmitted through the phase difference variable element to form elliptically polarized light or circularly polarized light, is transmitted through the λ/4 phase plate to form linearly polarized light. The polarization plane of the input light beam is rotated by an angle corresponding to the phase difference applied by the phase difference variable element.

公开(公告)号：US06862126B2

公开(公告)日：2005-03-01

申请号：US10286779

申请日：2002-11-04

申请人： Takashi Ishiwada ,  Hirotomo Izumi ,  Hiroshi Nagaeda ,  Nobuaki Mitamura

发明人： Takashi Ishiwada ,  Hirotomo Izumi ,  Hiroshi Nagaeda ,  Nobuaki Mitamura

IPC分类号： G02B5/28 ,  G02B5/30 ,  G02B6/26 ,  G02B6/34 ,  G02B26/00 ,  G02B27/28 ,  G02F1/09 ,  G02F1/21 ,  H01S3/10 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/2569 ,  H04B10/29 ,  H04B10/294 ,  G01B9/02 ,  G02F1/07

CPC分类号： G02B6/2746 ,  G02B6/272 ,  G02B6/2766 ,  G02B6/29358 ,  G02B6/29395 ,  G02B26/001 ,  G02B27/283 ,  G02F1/093 ,  G02F2001/213 ,  G02F2201/16 ,  G02F2203/05 ,  G02F2203/06

摘要： The present invention aims at providing a transmission wavelength characteristics variable optical element which can actively equalize changes of the wavelength characteristics due to temperature changes, and providing a wavelength characteristics variable apparatus, an optical amplifier, an optical transmission system, and a control method of the transmission wavelength characteristics, which use such an optical element. To this end, the transmission wavelength characteristics variable optical element according to the present invention comprises: an light interference section in which for example reflection films are formed on a light incident plane and a light emitting plane of a magneto-optic crystal; a permanent magnet that applies a fixed magnetic field to the magneto-optic crystal; an electromagnet that applies a variable magnetic field in a direction different from that of the fixed magnetic field; and a variable current source that controls the current flowing in the electromagnet, and varies transmission wavelength characteristics which occur due to an interference of light multireflected between the reflection films, by changing a Faraday rotation angle given to the light being propagated within the magneto-optic crystal, corresponding to a synthetic magnetic field formed by the fixed magnetic field and the variable magnetic field.

摘要翻译： 本发明的目的在于提供一种传输波长特性可变光学元件，其可以主动地均衡由于温度变化引起的波长特性的变化，并且提供波长特性可变设备，光放大器，光传输系统和控制方法 透射波长特性，其使用这种光学元件。 为此，根据本发明的透射波长特性可变光学元件包括：光干涉部，其例如在光入射面上形成反射膜和磁光晶体的发光面; 将固定磁场施加到磁光晶体的永磁体; 电磁体，其在与固定磁场的方向不同的方向上施加可变磁场; 以及可变电流源，其控制在电磁体中流动的电流，并且通过改变给予在磁光内传播的光的法拉第旋转角度，改变由于反射膜之间多次反射的光的干涉而发生的透射波长特性 晶体，对应于由固定磁场和可变磁场形成的合成磁场。

公开(公告)号：US07304798B2

公开(公告)日：2007-12-04

申请号：US10792747

申请日：2004-03-05

申请人： Hirotomo Izumi ,  Hiroshi Nagaeda ,  Nobuaki Mitamura

发明人： Hirotomo Izumi ,  Hiroshi Nagaeda ,  Nobuaki Mitamura

IPC分类号： G01B9/02 ,  G02B27/00

CPC分类号： G02B6/4246 ,  G01J3/0208 ,  G01J3/0286 ,  G01J3/18 ,  G01J3/26 ,  G01J3/2803 ,  G01J2003/1247 ,  G02B6/29311 ,  G02B6/29358 ,  G02B6/29373 ,  G02B6/29395 ,  G02B27/0087 ,  G02B27/1086 ,  G02B27/144 ,  G02F1/0147 ,  G02F1/03 ,  G02F2201/17 ,  G02F2203/055

摘要： A spectroscopic apparatus which is compact in size and performs high-precision light-splitting with a large angular dispersion. An optical input-processing section outputs a filtered transmitted light, using a bandpass filter that transmits only wavelength bands at one period of an input light, and collects the filtered transmitted light to generate a collected beam. An optic includes a first reflection surface and a second reflection surface which are high but asymmetric in reflectivity, and causes the collected beam incident thereon to undergo multiple reflections within an inner region between the first reflection surface and the second reflection surface, to thereby cause split beams to be emitted via the second reflection surface. A received light-processing section performs received light processing of the beams emitted from the optic. A control section variably controls at least one of a filter characteristic of the bandpass filter and an optical length through the optic.

摘要翻译： 一种尺寸紧凑并且具有大角度色散的高精度光分裂的分光装置。 光输入处理部分使用在输入光的一个周期仅发送波长带的带通滤波器来输出经滤波的透射光，并且收集被滤波的透射光以产生收集的光束。 光学元件包括反射率高但不对称的第一反射表面和第二反射表面，并且使入射到其上的收集的光束在第一反射表面和第二反射表面之间的内部区域内经历多次反射，从而导致分裂 经由第二反射面发射的光束。 接收到的光处理部分执行从光学元件发射的光束的接收光处理。 控制部分可变地控制带通滤波器的滤波器特性和通过光学器件的光学长度中的至少一个。

公开(公告)号：US20110052212A1

公开(公告)日：2011-03-03

申请号：US12661884

申请日：2010-03-25

申请人： Masahito Mure ,  Masahide Miyachi ,  Kaoru Higuma ,  Norikazu Miyazaki ,  Toshio Kataoka ,  Hiroyuki Sato ,  Hiroshi Nagaeda ,  Noriyasu Shiga ,  Yoichi Oikawa

发明人： Masahito Mure ,  Masahide Miyachi ,  Kaoru Higuma ,  Norikazu Miyazaki ,  Toshio Kataoka ,  Hiroyuki Sato ,  Hiroshi Nagaeda ,  Noriyasu Shiga ,  Yoichi Oikawa

IPC分类号： H04B10/06

CPC分类号： H04B10/677

摘要： The present invention relates to an optical receiver, and particularly, to an optical receiver by which a DQPSK-modulated optical signal is demodulated to a multilevel phase-modulated signal.

摘要翻译： 光接收机技术领域本发明涉及一种光接收机，特别涉及将DQPSK调制光信号解调为多电平相位调制信号的光接收机。

公开(公告)号：US20100134862A1

公开(公告)日：2010-06-03

申请号：US12602341

申请日：2008-05-30

申请人： Hiroshi Nagaeda ,  Yoichi Oikawa ,  Noriyasu Shiga ,  Yoshiaki Horiuchi

发明人： Hiroshi Nagaeda ,  Yoichi Oikawa ,  Noriyasu Shiga ,  Yoshiaki Horiuchi

IPC分类号： H01S3/13 ,  H01S3/10

CPC分类号： H01S3/1301 ,  H01S3/06754 ,  H01S3/1305 ,  H04B10/296

摘要： A high-speed optical amplifier is considered to be an important optical device because of an increasing demand of routing, which is accompanied by an increase in complexity of networks. It is difficult to satisfy a response performance by related-art techniques, and there has been a problem in achieving a high-speed response performance of 10 microseconds or less.An optical amplifier according to the present invention includes: an input monitor means 500; an optical amplification means 310 including an optical amplification medium 300, and a control means 400 for performing feed-forward control. When the optical amplification means is controlled by the feed-forward control in response to a signal of the input monitor means 500, an overshoot signal is applied as a control signal so that a slow response performance specific to the optical amplification medium has been improved, and thereby high-speed response performance has been achieved.

摘要翻译： 高速光放大器被认为是重要的光器件，因为路由需求的增加，伴随着网络的复杂性的增加。 通过现有技术难以满足响应性能，并且在实现10微秒以下的高速响应性能方面存在问题。 根据本发明的光放大器包括：输入监视装置500; 包括光放大介质300的光放大装置310和用于执行前馈控制的控制装置400。 当通过输入监视装置500的信号通过前馈控制来控制光放大装置时，施加过冲信号作为控制信号，使得光放大介质特有的缓慢响应性能得到改善， 从而实现了高速响应性能。