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11. 发明授权

US5889607A Optical modulator, optical short pulse generating device, optical waveform shaping device, and optical demultiplexer device 失效
标题翻译：光调制器，光短脉冲发生装置，光波形整形装置和光解复用装置
公开(公告)号：US5889607A
公开(公告)日：1999-03-30
申请号：US868976
申请日：1997-06-04
申请人： Masatoshi Suzuki , Noboru Edagawa , Itsuro Morita , Shu Yamamoto , Shigeyuki Akiba
发明人： Masatoshi Suzuki , Noboru Edagawa , Itsuro Morita , Shu Yamamoto , Shigeyuki Akiba
IPC分类号： G02F1/01 , G02F1/015 , G02F1/025 , H01S5/00 , G02F1/03
CPC分类号： G02F1/015 , G02F1/0121 , G02F2001/0157 , G02F2203/06 , G02F2203/26
摘要： Incident light 1 is inputted to an electro-absorption-type optical modulator 4 via an optical circulator 2 and a lens 3, and subjected to intensity modulation that corresponds to a modulation signal 8. The optical signal outputted by the electro-absorption-type optical modulator 4 is inputted to a Faraday rotator 6 via a lens 5, and the plane of polarization is rotated 45.degree.. The optical signal transmitted by the Faraday rotator 6 is totally reflected by a totally reflecting mirror 7, inputted for the second time to the Faraday rotator 6, then passed through the lens 5 after the plane of polarization has been rotated 45.degree. by this Faraday rotator 6, and readmitted by the electro-absorption-type optical modulator 4. The output of the electro-absorption-type optical modulator 4 is emitted via the lens 3 and the optical circulator 2. The polarization dependence of insertion loss can be eliminated because the plane of polarization is rotated 90.degree., and the incident light 1 readmitted to the electro-absorption-type optical modulator 4 at any plane of polarization. In view of this, the polarization dependent loss of an electro-absorption-type optical modulator can be eliminated by employing such optical modulators and creating a high-performance optical short pulse generating device, optical waveform shaping device, and optical demultiplexer.
摘要翻译：入射光1通过光环行器2和透镜3输入到电吸收型光调制器4，经受与调制信号8对应的强度调制。由电吸收型光调制器4通过透镜5输入到法拉第转子6，偏振面旋转45度。由法拉第旋转器6传输的光信号被全反射镜7全反射，全反射镜7第二次输入到法拉第旋转器6，然后在该法拉第旋转器旋转了45°的偏振面之后通过透镜5 电吸收型光调制器4再次进入。电吸收型光调制器4的输出通过透镜3和光循环器2发射。插入损耗的偏振依赖性可以被消除，因为偏振平面旋转90°，入射光1以任何偏振平面返回到电吸收型光调制器4。鉴于此，可以通过采用这种光学调制器来消除电吸收型光学调制器的偏振相关损耗，并且产生高性能的光学短脉冲产生装置，光学波形整形装置和光学解复用器。

12. 发明授权

US5872647A Optical transmitting terminal 失效
标题翻译：光发射终端
公开(公告)号：US5872647A
公开(公告)日：1999-02-16
申请号：US760411
申请日：1996-12-04
申请人： Hidenori Taga , Shu Yamamoto , Noboru Edagawa , Shigeyuki Akiba
发明人： Hidenori Taga , Shu Yamamoto , Noboru Edagawa , Shigeyuki Akiba
IPC分类号： G02F1/01 , H04B10/2569 , H04B10/40 , H04B10/50 , H04B10/516 , H04B10/524 , H04B10/556 , H04B10/60 , H04B10/61 , H04B10/04
CPC分类号： H04B10/532
摘要： The object of the present invention is to provide an optical transmitter which enables the reduction of the strong dependency of the transmission characteristic on the high-speed polarization scrambler driving signal phase. The light outputted from a light source is converted to a RZ pulse by an electro-absorption modulator. The RZ pulse is modulated by a data modulator, and the polarization thereof is scrambled in a high-speed electro-optic polarization scrambler and outputted from the output terminal thereof. Since, in the present invention, the light is once changed to a RZ pulse, the strong dependency of the optical signal transmission characteristic on the high-speed polarization scrambler driving signal phase can be reduced. Further, if the phase of the RZ pulse in the NRZ modulation signal is made to synchronize with the rising edge or the falling edge of the NRZ signal, the dependency on the high-speed polarization scrambler driving signal phase can be further reduced.
摘要翻译：本发明的目的是提供一种能够降低传输特性对高速偏振加扰器驱动信号相位的强依赖性的光发射机。从光源输出的光通过电吸收式调制器转换为RZ脉冲。 RZ脉冲由数据调制器调制，其极化在高速电光偏振扰乱器中被加扰并从其输出端输出。由于在本发明中，光一度变为RZ脉冲，所以可以降低光信号传输特性对高速偏振加扰器驱动信号相位的强烈依赖性。此外，如果使NRZ调制信号中的RZ脉冲的相位与NRZ信号的上升沿或下降沿同步，则可以进一步降低对高速偏振加扰器驱动信号相位的依赖性。

13. 发明授权

US5864421A Optical frequency shifter and optical soliton-like return-to-zero pulse transmission system using optical frequency shifter 失效
标题翻译：光移频器和光孤子回归到零脉冲传输系统使用光学变频器
公开(公告)号：US5864421A
公开(公告)日：1999-01-26
申请号：US864192
申请日：1997-05-28
申请人： Masatoshi Suzuki , Noboru Edagawa , Itsuro Morita , Shu Yamamoto , Shigeyuki Akiba
发明人： Masatoshi Suzuki , Noboru Edagawa , Itsuro Morita , Shu Yamamoto , Shigeyuki Akiba
IPC分类号： G02F1/35 , G02F1/33 , G02F2/02 , H04B10/2507 , H04B10/2519 , H04B10/2525 , H04B10/2569 , H04B10/29 , H04B10/291 , H04B10/02
CPC分类号： H04B10/25077 , G02F1/33
摘要： An optical frequency shifter which has no insertion loss polarization dependency and no polarization mode dispersion is formed by: at least one ultrasonic wave generator for generating ultrasonic waves; at least one electric acousto-optic element forming at least one diffraction grating therein upon being applied with the ultrasonic waves generated by the ultrasonic wave generator; at least one polarization rotator for rotating a polarization plane of a first primary diffracted light produced by the diffraction grating, by 90.degree.; and a light path through which an input light is entered into the electric acousto-optic element at a Bragg angle of the diffraction grating in a prescribed direction side, the prescribed direction being defined as either identical or opposite to a propagation direction of the ultrasonic waves, so that the first primary diffracted light is produced by the diffraction grating from the input light, a polarization plane rotated light produced by the polarization rotator is entered into the electric acousto-optic element at a Bragg angle of the diffraction grating in the prescribed direction side, and a second primary diffracted light produced by the diffraction grating from the polarization plane rotated light is outputted as an output light. An optical soliton-like return-to-zero pulse transmission system using a combination of this optical frequency shifter and a fixed optical filter in an optical amplifier repeater is also disclosed.
摘要翻译：通过以下方法形成没有插入损耗极化依赖性和无偏振模色散的光学移频器：至少一个用于产生超声波的超声波发生器; 至少一个电声光学元件在被施加超声波发生器产生的超声波时形成至少一个衍射光栅; 至少一个偏振旋转器，用于将由衍射光栅产生的第一主衍射光的偏振面旋转90度; 以及在规定的方向侧以衍射光栅的布拉格角将输入光输入到电声元件中的光路，规定的方向被定义为与超声波的传播方向相同或相反，使得第一主衍射光由衍射光栅从输入光产生，由偏振旋转器产生的偏振面旋转的光以预定方向的衍射光栅的布拉格角进入电声元件输出由衍射光栅从偏振面旋转的光产生的第二主衍射光作为输出光。还公开了在光放大器中继器中使用该光移频器和固定滤光器的组合的光孤子状归零脉冲传输系统。

14. 发明授权

US5822095A Optical add-drop multiplexer 失效
标题翻译：光分插复用器
公开(公告)号：US5822095A
公开(公告)日：1998-10-13
申请号：US702274
申请日：1996-08-23
申请人： Hidenori Taga , Takayuki Miyakawa , Shigeyuki Akiba
发明人： Hidenori Taga , Takayuki Miyakawa , Shigeyuki Akiba
IPC分类号： H04J14/00 , G02B6/293 , G02B6/34 , H04B10/2507 , H04B10/27 , H04B10/29 , H04J14/02 , H04L12/40 , H04Q11/00
CPC分类号： H04Q11/0003 , G02B6/29361 , G02B6/29362 , G02B6/29383 , H04J14/0206 , H04J14/0213 , H04Q2011/0009 , H04Q2011/0015 , H04Q2011/0035
摘要： An object of the present invention is to provide an optical add-drop multiplexer capable of giving improved characteristics with a simple, inexpensive arrangement which needs not a corresponding number of optical bandpass filters to the wavelength components of a light signal to be carried. The wavelength components .lambda.1 to .lambda.n of an input n-wave signal is received by an input optical fiber and transmitted through an optical circulator and an optical fiber to an optical bandpass filter which allows a specific wavelength .lambda.1 to pass but rejects the other wavelengths .lambda.2 to .lambda.n. While the rejected wavelengths .lambda.2 to .lambda.n are returned back to the optical fiber, the specific wavelength .lambda.1 runs through another optical fiber and another optical circulator and then is dropped from an output optical fiber. Meanwhile, another signal component of the wavelength .lambda.1 is added and introduced from another input optical fiber through the another optical circulator and the another optical fiber to the optical bandpass filter. Upon the added wavelength .lambda.1 having passed the optical bandpass filter and entering the optical fiber, it is mixed with the rejected wavelengths .lambda.2 to .lambda.n. A resultant sum signal of the full wavelengths .lambda.1 to .lambda.n is passed through the optical circulator and transmitted from an output optical fiber.
摘要翻译：本发明的一个目的是提供一种光分插复用器，其能够以简单且便宜的布置提供改进的特性，其不需要相对数量的光带通滤波器到待承载的光信号的波长分量。输入n波信号的波长分量λ1至λn由输入光纤接收，并通过光环行器和光纤传输到允许特定波长λ1通过但拒绝其他的光学带通滤波器波长λ2到λn。当被拒绝的波长λ2到λn返回到光纤时，特定波长λ1穿过另一个光纤和另一个光环行器，然后从输出光纤中掉落。同时，波长λ1的另一个信号分量从另一个输入光纤通过另一光环行器和另一光纤引入光带通滤波器。当经过光带通滤波器并进入光纤的附加波长λ1时，将其与被拒绝的波长λ2与λn混合。全波长λ1至λn的合成和信号通过光环行器并从输出光纤传输。

15. 发明授权

US5808789A Optically amplifying transmission system 失效
标题翻译：光放大传输系统
公开(公告)号：US5808789A
公开(公告)日：1998-09-15
申请号：US873568
申请日：1997-06-12
申请人： Noboru Edagawa , Hidenori Taga , Masatoshi Suzuki , Itsuro Morita , Shu Yamamoto , Shigeyuki Akiba
发明人： Noboru Edagawa , Hidenori Taga , Masatoshi Suzuki , Itsuro Morita , Shu Yamamoto , Shigeyuki Akiba
IPC分类号： H01S3/10 , H01S3/06 , H04B3/04 , H04B10/2513 , H04B10/29 , H04B10/294 , H04J14/00 , H04J14/02 , G02B6/26 , H04B3/14
CPC分类号： H04B10/2935 , H04B10/2912
摘要： An optically amplifying transmission system available for wider signal bands includes an optical transmission line 42 divided into two sections 42a and 42b, optically amplifying repeaters 48a having 7 m-long erbium-doped optical fibers to repeat transmission optical fibers 46a in the section 42a, and optically amplifying repeaters 48b having 10.8 m-long erbium-doped optical fibers to repeat transmission optical fibers 46b in the section 42b. The transmission optical fibers 46a an 46b are optical fibers absolutely identical in construction and length.
摘要翻译：可用于更宽信号频带的光放大传输系统包括分为两部分42a和42b的光传输线42，光放大具有7m长掺铒光纤的中继器48a，以重复部分42a中的传输光纤46a，以及将具有10.8m长的掺铒光纤的光放大中继器48b重复部分42b中的传输光纤46b。透射光纤46a，46b是结构和长度完全相同的光纤。

16. 发明授权

US5771255A Laser light generator 失效
标题翻译：激光灯发生器
公开(公告)号：US5771255A
公开(公告)日：1998-06-23
申请号：US799119
申请日：1997-02-11
申请人： Yukio Horiuchi , Shu Yamamoto , Shigeyuki Akiba
发明人： Yukio Horiuchi , Shu Yamamoto , Shigeyuki Akiba
IPC分类号： G02F1/01 , G02F1/35 , H01S5/00 , H01S5/06 , H01S5/068 , H01S3/13
CPC分类号： H04B10/50593 , H04B10/504 , H04B10/505 , H04B10/5051 , H04B10/50597 , H04B10/564
摘要： A laser light generator includes an adder 12 which adds an optical frequency modulation signal Sm onto a d.c. voltage for driving a laser diode 10 for continuous laser oscillation, and applies the sum signal to the laser diode 10 to drive it. An light output from the laser diode 10 is introduced to an optical intensity controller 14 that is controlled by a control signal prepared by adjusting the optical frequency modulation signal Sm both in phase and in amplitude by a phase adjusting circuit 16 and an amplitude adjusting circuit 18. The optical intensity controller 14 may be an electroabsorption modulator that changes its transmissivity in response to an output voltage of the circuit 18. Quantities of adjustment by the circuits 16 and 18 are determined so that fluctuation in transmissivity of the optical intensity controller 14 suppresses intensity fluctuation of the light output of the laser diode 10.
摘要翻译：激光发生器包括加法器12，该加法器12将光频调制信号Sm加到直流电路上。用于驱动用于连续激光振荡的激光二极管10的电压，并将和信号施加到激光二极管10以驱动它。来自激光二极管10的光输出被引入光强度控制器14，该光强度控制器14由通过相位调整电路16和振幅调整电路18调整相位和幅度的光频调制信号Sm而制备的控制信号来控制光强度控制器14可以是响应于电路18的输出电压来改变其透射率的电吸收调制器。确定电路16和18的调整量，使得光强度控制器14的透射率的波动抑制强度激光二极管10的光输出的波动。

17. 发明授权

US5625479A Soliton optical communication system and optical transmitter and optical receiver therefor 失效
标题翻译： Soliton光通信系统及光发射机及光接收机
公开(公告)号：US5625479A
公开(公告)日：1997-04-29
申请号：US372668
申请日：1995-01-13
申请人： Masatoshi Suzuki , Noboru Edagawa , Hidenori Taga , Shu Yamamoto , Shigeyuki Akiba
发明人： Masatoshi Suzuki , Noboru Edagawa , Hidenori Taga , Shu Yamamoto , Shigeyuki Akiba
IPC分类号： G02F1/35 , H04B10/2507 , H04B10/2513 , H04B10/40 , H04B10/50 , H04B10/508 , H04B10/556 , H04B10/58 , H04B10/60 , H04J14/08
CPC分类号： H04B10/25077 , H04J14/08
摘要： An optical transmitter which reverses the ON-OFF state of the optical intensity of a bright soliton lightwave and generates a dark soliton lightwave having an optical phase shift, an optical receiver for the dark soliton lightwave, and a superfast, high-capacity optical transmission system which is capable of increasing the soliton pulse array density while suppressing timing jitter. The optical transmission system is provided with the optical transmitter which transmits a dark soliton lightwave having digital information, the optical receiver which receives the dark soliton lightwave as a return-to-zero pulse and a transmission optical fiber interconnecting the transmitter and the receiver. The system has a construction in which the transmission optical fiber has, at the wavelength of the transmission lightwave, a normal dispersion value which makes negative the average wavelength dispersion value over the entire length of the optical fiber, and the average value of the wavelength dispersion value and the optical output intensity of the transmission optical fiber have values so that a non-linear optical effect and a wavelength dispersion effect, which are exerted on the transmission lightwave, are balanced with each other.
摘要翻译：一种光发射器，其反转明亮的孤子光波的光强度的ON-OFF状态并产生具有光学相移的暗孤子光波，用于暗孤子光波的光接收器，以及超快大容量光传输系统其能够在抑制定时抖动的同时增加孤子脉冲阵列密度。光传输系统设置有发射具有数字信息的暗孤子光波的光发射机，接收暗孤子光波作为归零脉冲的光接收机和互连发射机和接收机的传输光纤。该系统具有这样的结构，其中传输光纤在传输光波长的波长处具有在光纤的整个长度上使平均波长色散值为负的正常色散值，并且波长色散的平均值值和发射光纤的光输出强度具有使得施加在透射光波上的非线性光学效应和波长色散效应彼此平衡的值。

18. 发明授权

US4913506A Optical modulation device 失效
标题翻译：光调制装置
公开(公告)号：US4913506A
公开(公告)日：1990-04-03
申请号：US311218
申请日：1989-02-16
申请人： Masatoshi Suzuki , Shigeyuki Akiba , Hideaki Tanaka , Katsuyuki Utaka
发明人： Masatoshi Suzuki , Shigeyuki Akiba , Hideaki Tanaka , Katsuyuki Utaka
IPC分类号： G02F1/015 , G02F1/017 , G02F1/025 , G02B6/10
CPC分类号： B82Y20/00 , G02F1/01708 , G02F1/025 , G02F2001/0157 , G02F2202/101 , G02F2202/102
摘要： An optical modulation device is disclosed in which a difference between the photon energy of incident light and the band-gap energy of the modulation waveguide layer is set to a value greater than 50 meV to thereby suppress the degradation of the modulation voltage and the modulation band width which is caused by an increase in the intensity of incident light and in that the optical modulation device is formed in a predetermined length to thereby decrease the modulation voltage. The energy gap of the optical waveguide layer of the optical modulation device is varied continuously or discontinuously in the direction of its thickness to provide a constant absorption coefficient thickwise of the optical waveguide layer so that the electric field intensity distribution in the optical waveguide layer is compensated for, by which overlap of the light distribution and the absorption coefficient is increased so as to decrease the modulation voltage and broaden the modulation band by the reduction of the length of the device. The composition, thickness and stripe width of the optical waveguide layer are changed so that its absorption coefficient increases from the light receiving end face of the optical waveguide layer toward its light emitting end face, thereby making the number of carriers absorbed per unit length substantially constant in the direction of travel of light.
摘要翻译：公开了一种光调制装置，其中将入射光的光子能量与调制波导层的带隙能量之间的差设定为大于50meV的值，从而抑制调制电压和调制带的劣化由入射光强度的增加引起的宽度，并且光调制装置形成为预定长度，从而降低调制电压。光调制装置的光波导层的能隙在其厚度方向上连续或不连续地变化，以提供光波导层厚度的恒定吸收系数，使得光波导层中的电场强度分布得到补偿由此，增加了光分布和吸收系数的重叠，从而降低了调制电压，并且通过减小器件的长度来扩大调制频带。改变光波导层的组成，厚度和条纹宽度，使得其吸收系数从光波导层的光接收端面向其发光端面增加，从而使每单位长度吸收的载流子基本恒定在光的行进方向。

19. 发明授权

US4682196A Multi-layered semi-conductor photodetector 失效
标题翻译：多层半导体光电探测器
公开(公告)号：US4682196A
公开(公告)日：1987-07-21
申请号：US806746
申请日：1985-12-09
申请人： Kazuo Sakai , Yuichi Matsushima , Shigeyuki Akiba , Katsuyuki Utaka
发明人： Kazuo Sakai , Yuichi Matsushima , Shigeyuki Akiba , Katsuyuki Utaka
IPC分类号： H01L29/205 , H01L31/0352 , H01L31/11 , H01L27/14 , H01L29/12
CPC分类号： H01L29/205 , H01L31/035281 , H01L31/11 , Y02E10/50
摘要： A semiconductor device, which is formed by a sequential lamination of a first semiconductor layer having a carrier concentration more than 10.sup.17 cm.sup.-3, a second semiconductor layer having a carrier concentration less than 10.sup.16 cm.sup.-3, a third semiconductor layer having a carrier concentration more than 10.sup.17 cm.sup.-3 and a thickness less than 300 .ANG., a fourth semiconductor layer having a carrier concentration less than 10.sup.16 cm.sup.-3, and a fifth semiconductor layer having a carrier concentration more than 10.sup.17 cm.sup.-3 and, in which the first and fifth semiconductor layers are the same in conductivity type and the third semiconductor layer is different in conductivity type from the fifth semiconductor layer. In accordance with the present invention, the energy gap of the third semiconductor layer is larger than the energy gaps of the second and fourth semiconductor layers. An annular region of a semi-insulating material or of the same conductivity type as that of the third semiconductor layer may be formed around an active region to extend from the fifth semiconductor layer to the second semiconductor layer.
摘要翻译：一种半导体器件，其通过顺次层叠具有载流子浓度大于1017cm -3的第一半导体层，载流子浓度小于1016cm-3的第二半导体层，具有载流子浓度的第三半导体层大于1017cm-3，厚度小于300，载流子浓度小于1016cm-3的第四半导体层和载流子浓度大于1017cm-3的第五半导体层，其中第一并且第五半导体层的导电类型相同，并且第三半导体层的导电类型与第五半导体层不同。根据本发明，第三半导体层的能隙大于第二和第四半导体层的能隙。可以在有源区周围形成半绝缘材料或与第三半导体层相同的导电类型的环形区域，以从第五半导体层延伸到第二半导体层。

20. 发明授权

US4660934A Method for manufacturing diffraction grating 失效
$Method for manufacturing diffraction grating$
标题翻译：衍射光栅的制造方法
公开(公告)号：US4660934A
公开(公告)日：1987-04-28
申请号：US710984
申请日：1985-03-12
申请人： Shigeyuki Akiba , Katsuyuki Utaka , Kazuo Sakai , Yuichi Matsushima
发明人： Shigeyuki Akiba , Katsuyuki Utaka , Kazuo Sakai , Yuichi Matsushima
IPC分类号： G02B5/18 , G03F7/00 , G03F7/095
CPC分类号： G03F7/095 , G02B5/1857 , G03F7/001 , Y10S359/90
摘要： A method for manufacturing diffraction grating, in which after forming, on a substrate, one of a negative type photoresist film (an N film) and a positive type photoresist film (a P film) to cover a first region A and the other of the negative type photoresist film and the positive type photoresist film, or the latter film on the former one to cover a second region B, the first region and the second region are subjected to two-beam interference exposure, thereby forming a diffraction grating in which corrugations in the first region and the second region are reverse in phase to each other, through utilization of characteristics of the negative type photoresist film and the positive type photoresist film. Another feature of the present invention resides in that after forming, on a substrate, a structure in which a negative type photoresist film (an N film) is formed to cover only a first region A and the negative type photoresist film is formed on a positive type photoresist film (a P film) to cover a second region B, the first region and the second region of the substrate are subjected to two-beam interference exposure, thereby forming a diffraction grating in which corrugations in the first region and the second region are reverse in phase to each other, through utilization of characteristics of the negative type photoresist film and the positive type photoresist film.
摘要翻译：制造衍射光栅的方法，其中在基板上形成负型光致抗蚀剂膜（N膜）和正型光致抗蚀剂膜（P膜）之一以覆盖第一区域A和另一个负型光致抗蚀剂膜和正型光致抗蚀剂膜，或者在前者的后者膜覆盖第二区域B，第一区域和第二区域受到双光束干涉曝光，从而形成衍射光栅，其中波纹通过利用负型光致抗蚀剂膜和正型光致抗蚀剂膜的特性，在第一区域和第二区域中的相位彼此相反。本发明的另一个特征在于，在基板上形成后，形成负型光致抗蚀剂膜（N膜）仅覆盖第一区域A并且负型光致抗蚀剂膜形成为阳性的结构（P膜）覆盖第二区域B，对基板的第一区域和第二区域进行双光束干涉曝光，从而形成衍射光栅，其中第一区域和第二区域中的波纹通过利用负型光致抗蚀剂膜和正型光致抗蚀剂膜的特性，彼此相反。

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