公开(公告)号：US07209284B2

公开(公告)日：2007-04-24

申请号：US11185874

申请日：2005-07-21

申请人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

发明人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

IPC分类号： H01S4/00 ,  G02B26/02 ,  G02B5/30 ,  G02F1/19

CPC分类号： H04B10/2931 ,  G02F1/0123 ,  G02F1/093 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094015 ,  H01S3/10015 ,  H01S3/10023 ,  H01S3/1305 ,  H01S3/1608 ,  H04B10/2941

摘要： An optical apparatus which is reduced in the number of optical devices arranged on a main optical signal transmission path, thereby reducing the size and cost of the device, and which is improved in optical transmission quality. An optical amplifier includes an amplification medium, which is doped with an active material for optical amplification and to which pump light is introduced, for amplifying an optical signal to be output. A reflection-type variable optical attenuator includes a reflecting mirror for reflecting an input light to generate a reflected light, and a magneto-optical crystal arranged in a position where the input and reflected lights pass. The magneto-optical crystal is applied with a magnetic field to induce a Faraday rotation angle therein and thereby vary an attenuation amount of the amplified optical signal, and part of light transmitted through the reflecting mirror is converted, as input monitor light, into an electrical signal.

摘要翻译： 减少了布置在主光信号传输路径上的光学装置的数量的光学装置，从而减小了装置的尺寸和成本，并提高了光传输质量。 光放大器包括一个放大介质，其被掺入用于光放大的有源材料并被引入泵浦光，用于放大要输出的光信号。 反射型可变光衰减器包括用于反射输入光以产生反射光的反射镜和布置在输入和反射光通过的位置的磁光晶体。 磁光晶体被施加有磁场以在其中诱发法拉第旋转角度，从而改变放大的光信号的衰减量，并且透射通过反射镜的光的一部分作为输入监视光转换成电 信号。

公开(公告)号：US20050270635A1

公开(公告)日：2005-12-08

申请号：US11185874

申请日：2005-07-21

申请人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

发明人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

IPC分类号： G02F1/01 ,  G02F1/09 ,  H01S3/00 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/16

CPC分类号： H04B10/2931 ,  G02F1/0123 ,  G02F1/093 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094015 ,  H01S3/10015 ,  H01S3/10023 ,  H01S3/1305 ,  H01S3/1608 ,  H04B10/2941

摘要： An optical apparatus which is reduced in the number of optical devices arranged on a main optical signal transmission path, thereby reducing the size and cost of the device, and which is improved in optical transmission quality. An optical amplifier includes an amplification medium, which is doped with an active material for optical amplification and to which pump light is introduced, for amplifying an optical signal to be output. A reflection-type variable optical attenuator includes a reflecting mirror for reflecting an input light to generate a reflected light, and a magneto-optical crystal arranged in a position where the input and reflected lights pass. The magneto-optical crystal is applied with a magnetic field to induce a Faraday rotation angle therein and thereby vary an attenuation amount of the amplified optical signal, and part of light transmitted through the reflecting mirror is converted, as input monitor light, into an electrical signal.

摘要翻译： 减少了布置在主光信号传输路径上的光学装置的数量的光学装置，从而减小了装置的尺寸和成本，并提高了光传输质量。 光放大器包括一个放大介质，其被掺入用于光放大的有源材料并被引入泵浦光，用于放大要输出的光信号。 反射型可变光衰减器包括用于反射输入光以产生反射光的反射镜和布置在输入和反射光通过的位置的磁光晶体。 磁光晶体被施加有磁场以在其中诱发法拉第旋转角度，从而改变放大的光信号的衰减量，并且透射通过反射镜的光的一部分作为输入监视光转换成电 信号。

公开(公告)号：US06856455B2

公开(公告)日：2005-02-15

申请号：US10214311

申请日：2002-08-08

申请人： Norihisa Naganuma ,  Norifumi Shukunami

发明人： Norihisa Naganuma ,  Norifumi Shukunami

IPC分类号： H01S3/10 ,  H01S3/06 ,  H01S3/067 ,  H01S3/0933 ,  H01S3/094 ,  H01S5/00 ,  H04B10/2537 ,  H04B10/294 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H01S3/00

CPC分类号： H01S3/06754 ,  H01S3/0933 ,  H01S3/094011 ,  H01S3/094096

摘要： An apparatus has first and second light sources, a plurality of filters, and an optical switch. The light sources output a light beam having a spectrum determined by a gain band thereof. The plurality of filters each have a reflection band included in the gain band. The optical switch selectively couples the filters to the light source. The first and second light sources provide pumping light to a single transmission line. The first and second filters are configured so as to not reflect signal light to be amplified.

摘要翻译： 一种装置具有第一和第二光源，多个滤光器和光开关。 光源输出具有由其增益带确定的光谱的光束。 多个滤光器各自具有包括在增益带中的反射波段。 光开关选择性地将滤光片耦合到光源。 第一和第二光源向单个传输线提供泵浦光。 第一滤波器和第二滤波器被配置为不反射要被放大的信号光。

公开(公告)号：US06452720B1

公开(公告)日：2002-09-17

申请号：US08889875

申请日：1997-07-08

申请人： Norihisa Naganuma ,  Norifumi Shukunami

发明人： Norihisa Naganuma ,  Norifumi Shukunami

IPC分类号： H01S300

CPC分类号： H01S3/06754 ,  H01S3/0933 ,  H01S3/094011 ,  H01S3/094096

摘要： A light source apparatus suitable for use for evaluation of an optical device and for production of pump light for an optical amplifier. The apparatus includes a light emitting element having a gain band and a band reflection filter optically connected to the light emitting element. The light emitting element outputs a light beam having a spectrum which is determined by the gain band. The filter produces, from the light beam outputted from the light emitting element, a transmission beam and a reflection beam which returns to the light emitting element. The filter has a reflection band included in the gain band of the light emitting element and narrower than the gain band, and the transmission beam of the filter has a maximum power higher than the maximum power of the light beam to be outputted from the light emitting element. With the construction, pump light having a maximum power higher than the maximum power of the light to be outputted from the light emitting element can be obtained. Further, since the center wavelength of the light beam to be obtained is determined by the reflection band of the filter, even if the gain band or spectrum of the light emitting element has some dispersion, a light beam having a desired center wavelength can be obtained, and this allows evaluation of an optical device.

摘要翻译： 一种光源装置，适用于光学装置的评估和用于生产用于光放大器的泵浦光。 该装置包括具有增益带的光发射元件和与发光元件光学连接的带反射滤光器。 发光元件输出具有由增益带决定的光谱的光束。 滤光器从发光元件输出的光束产生透射光束和返回到发光元件的反射光束。 滤光器具有包括在发光元件的增益带中并且比增益带窄的反射带，并且滤光器的透射束具有比从发光的光束输出的光束的最大功率高的最大功率 元件。 通过这种结构，可以获得具有高于从发光元件输出的光的最大功率的最大功率的泵浦光。 此外，由于要获得的光束的中心波长由滤光器的反射带确定，所以即使发光元件的增益带或光谱具有某种色散，也可以获得具有期望的中心波长的光束 ，并且这允许评估光学装置。

公开(公告)号：US06310717B1

公开(公告)日：2001-10-30

申请号：US09313783

申请日：1999-05-17

申请人： Norihisa Naganuma ,  Norifumi Shukunami

发明人： Norihisa Naganuma ,  Norifumi Shukunami

IPC分类号： H01S300

CPC分类号： H01S3/094003 ,  H01S3/067 ,  H01S3/06716 ,  H01S3/06754

摘要： Disclosed herein is an optical amplifier reduced in gain deviation. The optical amplifier includes a nonsilica fiber doped with a rare earth, and a fiber holder in which the nonsilica fiber is inserted and fixed. The fiber holder is optically arranged so that signal light to be amplified propagates in the nonsilica fiber. The nonsilica fiber is pumped so that the nonsilica fiber provides a gain band including the wavelength of the signal light. Opposite ends of the fiber holder are hermetically sealed to thereby easily cut off the nonsilica fiber from the outside air, so that the nonsilica fiber is stabilized physically or chemically. A fluoride glass fiber is suitable for the nonsilica fiber to reduce the gain deviation in a 1.55 &mgr;m band.

摘要翻译： 本文公开了减小增益偏差的光放大器。 光放大器包括掺杂有稀土的非二极管光纤，以及其中插入和固定非二极纤维的光纤保持器。 光纤保持器被光学地布置，使得待放大的信号光在非二极纤维中传播。 泵浦非二极管光纤，使得非二极管光纤提供包括信号光的波长的增益带。 纤维架的相对端密封，从而容易地将非二氧化硅纤维与外部空气切断，使得非二氧化硅纤维物理或化学稳定。 氟化物玻璃纤维适用于非硅纤维，以减少1.55μm带中的增益偏差。

公开(公告)号：US20050249452A1

公开(公告)日：2005-11-10

申请号：US11180526

申请日：2005-07-14

申请人： Shinji Maruyama ,  Norihisa Naganuma

发明人： Shinji Maruyama ,  Norihisa Naganuma

IPC分类号： G02B6/34 ,  G02B6/12

CPC分类号： G02B6/12019 ,  G02B6/29328

摘要： In an optical switch device: output waveguides are arranged with such a pitch as to realize a split wavelength gap equal to or smaller than half of a gap between operating wavelengths of optical signals; at least two input waveguides are arranged with the same pitch; at least one slab waveguide spreads light from the input waveguides to be outputted to a grating element, condenses first light from the grating element to be outputted into the input waveguides, condenses second light from the grating element for each wavelength to be outputted into the output waveguides, and spreads light from the output waveguides to be outputted to the grating element; and the optical switch unit selects signals at an identical wavelength in adjacent output waveguides, and performs 2×2 switching of the signals so as to output the signals from the input waveguides.

摘要翻译： 在光开关装置中：输出波导以这样的间距排列，以实现等于或小于光信号工作波长之间的间隙的一半的分离波长间隙; 至少两个输入波导以相同的间距排列; 至少一个平板波导将来自输入波导的光展开以输出到光栅元件，将来自光栅元件的第一光凝结输出到输入波导中，将来自光栅元件的第二光从每个波长聚光以输出到输出 波导，并且从输出波导扩散光以输出到光栅元件; 并且光学开关单元选择相邻输出波导中相同波长的信号，并且执行信号的2×2切换，以输出来自输入波导的信号。

公开(公告)号：US06650797B2

公开(公告)日：2003-11-18

申请号：US10068941

申请日：2002-02-11

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： G02B600

CPC分类号： G02B6/29395 ,  G02B6/2713 ,  G02B6/272 ,  G02B6/2766 ,  G02B6/2773 ,  G02B6/29302 ,  G02B6/2934 ,  G02B6/29361 ,  G02B6/4246 ,  H04B10/2941

摘要： A wavelength characteristic control device capable of variably controlling a wavelength characteristic in a satisfactory manner. A polarized light wavelength characteristic changing element has a wavelength characteristic such that the transmittances or reflectances of P- and S-polarized rays vary differently with respect to wavelength. Polarization variable control means subjects the plane of polarization of the polarized light incident on the polarized light wavelength characteristic changing element to rotatory control to change the ratio of the P-polarized ray to the S-polarized ray, thereby variably controlling the wavelength characteristic.

摘要翻译： 一种能够以令人满意的方式可变地控制波长特性的波长特性控制装置。 偏振光波长特性变化元件具有使得P和S偏振光的透射率或反射率相对于波长不同变化的波长特性。 极化可变控制装置使入射到偏振光波长特性变化元件上的偏振光的偏振面受到旋转控制，以改变P偏振光线与S偏振光线的比例，从而可变地控制波长特性。

公开(公告)号：US06496619B2

公开(公告)日：2002-12-17

申请号：US09356049

申请日：1999-07-16

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： G02B626

CPC分类号： G02B6/4215 ,  G02B6/29391 ,  H04B10/2941

摘要： A method for gain equalization. In this method, an optical transmission line including an optical amplifier for giving a gain to WDM (wavelength division multiplexed) signal light is first provided. Gain equalization is next performed on the optical transmission line so as to obtain a gain changing substantially monotonously with respect to wavelength. Gain equalization is further performed on the optical transmission line so as to obtain a gain substantially fixed with respect to wavelength. A wavelength characteristic of gain changing monotonously can be easily gain-equalized by an active gain equalizer having a simple configuration. Accordingly, even when the optical amplifier has a nonmonotonous wavelength characteristic of gain, a gain tilt in the optical amplifier can be easily flattened.

摘要翻译： 一种增益均衡的方法。 在该方法中，首先提供包括用于对WDM（波分复用）​​信号光进行增益的光放大器的光传输线。 接着在光传输线上执行增益均衡，以获得相对于波长基本单调变化的增益。 在光传输线上进一步进行增益均衡，以获得相对于波长基本固定的增益。 可以通过具有简单配置的有源增益均衡器容易地增益增益增益单调变化的波长特性。 因此，即使当光放大器具有增益的非单调波长特性时，光放大器中的增益倾斜也容易变平。

公开(公告)号：US5125053A

公开(公告)日：1992-06-23

申请号：US662736

申请日：1991-03-01

申请人： Kenichi Abe ,  Norihisa Naganuma ,  Hisashi Takamatsu

发明人： Kenichi Abe ,  Norihisa Naganuma ,  Hisashi Takamatsu

IPC分类号： G02B6/28 ,  G02B6/34 ,  G02B6/42 ,  H01S3/094

CPC分类号： H01S3/094003 ,  G02B6/2817 ,  G02B6/4209 ,  H01S3/094019 ,  H01S3/09408

摘要： An optical coupler is disclosed which couples a signal beam and a pumping beam having proximate wavelengths to each other. The optical coupler includes a first prism having an included angle of 45 degrees, and a triangular prism having an apex angle of 22.5 degrees and adhered to a face of the first prism on which an optical wavelength multiplexing film is formed. The signal beam and the pumping beam multiplexed by the optical coupled is introduced into an Er doped fiber, in which the signal beam is amplified directly.

公开(公告)号：US06829396B2

公开(公告)日：2004-12-07

申请号：US10612959

申请日：2003-07-07

申请人： Norihisa Naganuma

发明人： Norihisa Naganuma

IPC分类号： G02B600

CPC分类号： G02B6/29395 ,  G02B6/2713 ,  G02B6/272 ,  G02B6/2766 ,  G02B6/2773 ,  G02B6/29302 ,  G02B6/2934 ,  G02B6/29361 ,  G02B6/4246 ,  H04B10/2941

摘要： A wavelength characteristic control device capable of variably controlling a wavelength characteristic in a satisfactory manner. A polarized light wavelength characteristic changing element has a wavelength characteristic such that the transmittances or reflectances of P- and S-polarized rays vary differently with respect to wavelength. Polarization variable control means subjects the plane of polarization of the polarized light incident on the polarized light wavelength characteristic changing element to rotatory control to change the ratio of the P-polarized ray to the S-polarized ray, thereby variably controlling the wavelength characteristic.

摘要翻译： 一种能够以令人满意的方式可变地控制波长特性的波长特性控制装置。 偏振光波长特性变化元件具有使得P和S偏振光的透射率或反射率相对于波长不同变化的波长特性。 极化可变控制装置使入射到偏振光波长特性变化元件上的偏振光的偏振面受到旋转控制，以改变P偏振光线与S偏振光线的比例，从而可变地控制波长特性。