公开(公告)号：US06556325B1

公开(公告)日：2003-04-29

申请号：US09507233

申请日：2000-02-18

申请人： Yukio Horiuchi ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Yukio Horiuchi ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： H04B1002

CPC分类号： H04B10/2916 ,  H04B10/0777 ,  H04B2210/074

摘要： An optical repeater monitoring system, according to the invention, comprises an oscillating source, a reference signal transmitter for transmitting a reference signal of a predetermined frequency generated from an output of the oscillating source to a first optical fiber, and an optical repeater. The optical repeater has a first photodetector for converting light from the first optical fiber into an electrical signal, a reference signal extractor for extracting a component of the reference signal from an output of the first photodetector, a carrier generator for generating a carrier from an output of the reference signal extractor, a monitor signal modulator for modulating the carrier generated by the carrier generator with a monitor signal showing a operating state of the optical repeater, a transmitter for transmitting an output of the monitor signal modulator to a second optical fiber. The system further comprises a demodulating signal generator for generating a demodulating signal from either of the output from the oscillating source and the reference signal, the demodulating signal having a frequency equal to that of the monitor signal carrier, a second photodetector for photodetecting the light propagated on the second fiber, and a monitor signal demodulator for demodulating the monitor signal from outputs of the second photodetector and demodulating signal generator.

摘要翻译： 根据本发明的光中继器监视系统包括振荡源，参考信号发射器，用于将从振荡源的输出产生的预定频率的参考信号传输到第一光纤，以及光中继器。 光中继器具有用于将来自第一光纤的光转换成电信号的第一光电检测器，用于从第一光电检测器的输出提取参考信号的分量的参考信号提取器，用于从输出端产生载波的载波发生器 参考信号提取器的监视信号调制器，用于利用示出所述光中继器的操作状态的监视信号调制由所述载波发生器产生的所述载波的监视信号调制器，用于将所述监视信号调制器的输出发送到第二光纤的发射器。 该系统还包括解调信号发生器，用于从振荡源的输出和参考信号中的任一个产生解调信号，解调信号的频率等于监视信号载波的频率;第二光电检测器，用于光检测传播的光 以及用于从第二光电检测器和解调信号发生器的输出解调监视信号的监视信号解调器。

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。

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。

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。

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。

公开(公告)号：US06614588B1

公开(公告)日：2003-09-02

申请号：US09725288

申请日：2000-11-29

申请人： Aritomo Uemura ,  Kiwami Matsushita ,  Yukio Horiuchi ,  Masatoshi Suzuki ,  Noboru Edagawa ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Aritomo Uemura ,  Kiwami Matsushita ,  Yukio Horiuchi ,  Masatoshi Suzuki ,  Noboru Edagawa ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： H01S300

CPC分类号： H04B10/29 ,  H04B10/2918 ,  H04B10/808

摘要： The optical amplifier according to the present invention is constructed such that the amount of the electric current fed to the power feeding line 2a is first detected by the current detection means, and then a setting signal is generated to each of the bypass circuits 22 and 23 in accordance with the thus detected amount of the fed current, and thereafter the output level of each of the optical repeater circuits 11 and 12 is controlled respectively by the bypass circuits 22 and 23, so that the output level of these repeater circuits 11 and 12 can be controlled in accordance with the amount of the current fed to the power feeding line 2a.

公开(公告)号：US5898714A

公开(公告)日：1999-04-27

申请号：US783589

申请日：1997-01-13

申请人： Itsuro Morita ,  Noboru Edagawa ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Itsuro Morita ,  Noboru Edagawa ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： G02F1/35 ,  H01S3/30 ,  H04B10/2507 ,  H04B10/2525 ,  H04B10/29 ,  H04B10/293 ,  H04B10/508 ,  H04B10/524

CPC分类号： H01S3/302 ,  H01S2301/085

摘要： An optical pulse generator, capable of generating ultrashort optical pulses suitable for optical soliton transmission, includes a DFB laser 10 for continuous laser oscillation, an electroabsorbtion modulator 12 for creating a sequence of optical pulses of the pulse width 14.6 ps from optical output of the laser 10. Output from an optical modulator 12 enters into a dispersion decreasing fiber 16 via an optical isolator 14. The dispersion decreasing fiber 16 has chromatic dispersion that decreases from 13.7 ps/nm/km to 2.3 ps/nm/km with distance, and its fiber length is 15 km. Pump laser beams from pump lasers 20, 24 are introduced to the dispersion decreasing fiber 16 by optical couplers 18, 22, and the fiber 16 functions as a Raman amplifier. When the Raman gain is 2.4 dB, the pulse width is compressed from 14.6 ps to 5.8 ps, approximately, even when the power of input pulses to the dispersion decreasing fiber 16 complies with the soliton condition.

摘要翻译： 能够产生适用于光孤子传输的超短光脉冲的光脉冲发生器包括用于连续激光振荡的DFB激光器10，用于从激光器的光输出产生脉冲宽度为14.6ps的光脉冲序列的电吸收调制器12 来自光调制器12的输出经由光隔离器14进入色散减小的光纤16.色散减小光纤16具有从距离13.7ps / nm / km降低到2.3ps / nm / km的色散，并且其色散 纤维长度为15公里。 来自泵浦激光器20,24的泵浦激光束通过光耦合器18,22引入到色散减小光纤16，并且光纤16用作拉曼放大器。 当拉曼增益为2.4dB时，即使当色散减小的光纤16的输入脉冲的功率符合孤子条件时，脉冲宽度也从大约14.6ps压缩到5.8ps。

公开(公告)号：US5883734A

公开(公告)日：1999-03-16

申请号：US827638

申请日：1997-04-10

申请人： Masatoshi Suzuki ,  Shigeyuki Akiba

发明人： Masatoshi Suzuki ,  Shigeyuki Akiba

IPC分类号： G02F1/33 ,  G02F1/29

CPC分类号： G02F1/33 ,  Y10S372/703

摘要： An optical switch is formed by: at least one switch driving circuit 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 switch driving circuit; 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 first direction side, the first 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 a second direction side, the second direction being opposite to the first direction, and a second primary diffracted light produced by the diffraction grating from the polarization plane rotated light is outputted as an output light.

摘要翻译： 光开关由以下部分形成：用于产生超声波的至少一个开关驱动电路; 在施加由开关驱动电路产生的超声波时，至少一个形成至少一个衍射光栅的电声元件; 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; 以及光路，通过所述光路将输入光以第一方向侧的衍射光栅的布拉格角输入到所述电声元件中，所述第一方向被定义为与所述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光以第二方向的衍射光栅的布拉格角进入电声元件 侧，第二方向与第一方向相反，并且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。

公开(公告)号：US5737110A

公开(公告)日：1998-04-07

申请号：US770454

申请日：1996-12-20

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 ,  H04B10/00

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。

公开(公告)号：US5642215A

公开(公告)日：1997-06-24

申请号：US521952

申请日：1995-08-31

申请人： Masatoshi Suzuki ,  Itsuro Morita ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Masatoshi Suzuki ,  Itsuro Morita ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： G02F1/35 ,  H01S3/10 ,  H04B10/2507 ,  H04B10/508 ,  H04B10/524 ,  H04B10/58 ,  H04B10/00

CPC分类号： H04B10/25077

摘要： An optical transmission system which permits long-distance, ultrafast, high-capacity optical soliton transmission by suppressing timing jitter with simple means. In an optical transmission system which uses a transmission line composed of an optical fiber for transmitting therethrough a lightwave signal having digital information added to a return-to-zero lightwave pulse and a plurality of optical amplifying repeaters for compensating for losses by the optical fiber and in which the pulse compression effect by the nonlinear optical effect on the optical pulse and the pulse expansion effect by the dispersion effect are compensated, at least one optical band limited element which has a flat group delay characteristic near the center frequency is disposed in the transmission line at intervals of a period Z equal to the soliton period Z.sub.sol and the product, aB.sub.sol.spsb.2, of the curvature a of the product of the intensity transfer funtions of the optical band limited elements in the vicinity of the center frequency in the soliton period and the square of the full width at half maximum, B.sub.sol, of the spectrum of the lightwave pulse to be transmitted is set to a value in the range of 2.1.times.10.sup.-2 to 8.3.times.10.sup.-2.

摘要翻译： 一种光传输系统，通过简单的手段抑制定时抖动，允许长距离，超快速，高容量的光孤子传输。 在光传输系统中，使用由光纤组成的传输线通过其传输具有添加到归零光波脉冲的数字信息的光波信号和用于补偿光纤损耗的多个光放大中继器，以及 其中通过非线性光学效应对光脉冲的脉冲压缩效应和由色散效应产生的脉冲扩展效应被补偿，至少一个在中心频率附近具有平坦组延迟特性的光学带限制元件设置在透射 以等于孤子周期Zsol的周期Z的间隔和在孤子周期中的中心频率附近的光学带限制元件的强度转移功率的乘积的曲率a的乘积aBsol2，以及 要发送的光波脉冲的频谱的半峰全宽Bsol被设定为t o在2.1×10-2至8.3×10-2的范围内的值。