公开(公告)号：US6028695A

公开(公告)日：2000-02-22

申请号：US124993

申请日：1998-07-30

申请人： Aritomo Uemura ,  Takashi Mizuochi ,  Katsuhiro Shimizu ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto

发明人： Aritomo Uemura ,  Takashi Mizuochi ,  Katsuhiro Shimizu ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto

IPC分类号： G02F1/03 ,  H04B10/07 ,  H04B10/516 ,  H04B10/54 ,  H04B10/548 ,  H04B10/58 ,  H04B10/61 ,  G02F1/035 ,  G02F1/055

CPC分类号： G02F1/0327 ,  G02F2203/25

摘要： When an intensity modulating operation and a phase modulating operation are carried out by employing a 2-electrode MachZehnder type optical modulator preferably a LN-MZ type optical modulator, a drive signal of this 2-electrode LN-MZ type optical modulator is produced from an intensity modulation signal and a phase modulation signal with a low loss and a simple arrangement. A optical modulating apparatus includes a splitter/combiner structured to split an intensity modulation signal inputted into a first input terminal into a first electric signal having an in-phase relationship with that of the intensity modulation signal and second electric signal having an inverse phase relationship therewith, split a phase modulation signal inputted into a second input terminal into a third electric signal having an in-phase relationship with that of the phase modulation signal an also a fourth electric signal having an in-phase relationship therewith, combine the first electric signal with the fourth electric signal to thereby output a first combined signal, and combine the second electric signal with the third electric signal to thereby output a second combined signal; and an optical modulating means structured to split a light carrier wave entered from a light source into two light carrier waves, and to optically modulate the two sets of the split light carrier waves by using the first combined signal and the second combined signal derived from the splitter/combiner, and combine the two phase-modulated above said light carrier waves to output an optical modulation signal.

摘要翻译： 当通过使用优选为LN-MZ型光调制器的2电极MachZehnder型光学调制器进行强度调制操作和相位调制操作时，该2电极LN-MZ型光调制器的驱动信号由 强度调制信号和具有低损耗和简单布置的相位调制信号。 光调制装置包括：分离器/组合器，被构造成将输入到第一输入端的强度调制信号分成与强度调制信号的同相关系的第一电信号和与其相反的相位关系的第二电信号 将输入到第二输入端子的相位调制信号分别成为与相位调制信号同相的同步关系的第三电信号，以及与其同相关系的第四电信号，将第一电信号与 第四电信号，从而输出第一组合信号，并将第二电信号与第三电信号组合，从而输出第二组合信号; 以及光调制装置，被构造成将从光源进入的光载波分成两个光载波，并且通过使用从第二组合信号导出的第一组合信号和第二组合信号对两组分裂光载波进行光学调制 分离器/组合器，并且组合在所述轻载波上的两个相位调制以输出光调制信号。

公开(公告)号：US5978529A

公开(公告)日：1999-11-02

申请号：US36485

申请日：1998-03-06

申请人： Hidenori Taga ,  Noriyuki Takeda ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Hidenori Taga ,  Noriyuki Takeda ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： H04B10/2507 ,  H04B10/25 ,  H04B10/293 ,  H04J14/02 ,  G02B6/28

CPC分类号： H04B10/2935 ,  H04J14/0221

摘要： This invention provides the gain equalizer positioned to an optical amplifying transmission line for equalizing gains of said optical amplifying transmission line, comprising a plurality of first optical filters varying transmittance periodically in at least predetermined wavelength range, and one or more second optical filters that their transmittance peaks at a wavelength substantially coinciding to the predetermined transmittance bottom wavelength of the first optical filters and decreases in a predetermined range at both side of the predetermined transmittance bottom wavelength.

摘要翻译： 本发明提供了一种位于光放大传输线上的增益均衡器，用于均衡所述光放大传输线的增益，包括在至少预定波长范围内周期性地改变透射率的多个第一滤光器和一个或多个第二滤光器， 在与第一光学滤波器的预定透射率底部波长基本一致的波长处的峰值在预定透射率底部波长的两侧的预定范围内减小。

公开(公告)号：US5959764A

公开(公告)日：1999-09-28

申请号：US923349

申请日：1997-09-04

申请人： Noboru Edagawa ,  Masatoshi Suzuki ,  Shu Yamamoto

发明人： Noboru Edagawa ,  Masatoshi Suzuki ,  Shu Yamamoto

IPC分类号： G02F2/02 ,  G02F1/015 ,  G02F2/00 ,  G02F3/00 ,  H04B10/2507 ,  H04B10/29 ,  H04B10/516 ,  H04B10/54 ,  H04B10/572 ,  H04B10/58 ,  H04B10/61 ,  H04J14/08 ,  G02F1/39

CPC分类号： G02F2/004 ,  G02F2001/0157 ,  H01S5/509 ,  H04J14/08

摘要： A waveform converter includes a transmission-type InGaAsP electroabsorption optical modulator 10 using the Franz-Keldysh effect. Continuous light (probe light) 12 as a target of wavelength conversion is fed to an end surface 10a of the optical modulator 10 while a constant voltage of 3 V is applied to the optical modulator 10. An optical circulator 14 is supplied with original signal light (signal light to be waveform-converted) 16 through its terminal A, and delivers it from the terminal B thereof to another end surface 10b of the optical modulator 10. The optical modulator 10 gives a loss to the probe light 12 according to the intensity of the original signal light 16 and makes the waveform of the probe light 12 to be substantially the same as the original signal light. The probe light waveform-converted by the optical modulator 10 and output from the end surface 10b is fed to a terminal B of an optical circulator 14 as a waveform-converted light 18 and output from its terminal C.

摘要翻译： 波形转换器包括使用Franz-Keldysh效应的透射型InGaAsP电吸收光调制器10。 将作为波长转换的目标的连续光（探测光）12馈送到光调制器10的端面10a，同时将3V的恒定电压施加到光调制器10。光环行器14被提供有原始信号光 （要被波形转换的信号光）16，并将其从端子B传送到光调制器10的另一端面10b。光调制器10根据强度给探测光12带来损耗 的原始信号光16，使探测光12的波形基本上与原始信号光相同。 由光调制器10波形转换并从端面10b输出的探测光被作为波形转换光18馈送到光环行器14的端子B，并从其端子C输出。

公开(公告)号：US5937126A

公开(公告)日：1999-08-10

申请号：US987812

申请日：1997-12-10

申请人： Shu Yamamoto ,  Noboru Edagawa ,  Hidenori Taga ,  Shigeyuki Akiba

发明人： Shu Yamamoto ,  Noboru Edagawa ,  Hidenori Taga ,  Shigeyuki Akiba

IPC分类号： H04B3/36 ,  H04B10/25 ,  H04B10/2543 ,  H04B10/29 ,  H04B10/291 ,  H04B10/293 ,  H04B10/564 ,  H04B10/572 ,  G02B6/02

CPC分类号： H04B10/2912 ,  H04B10/291

摘要： An optical transmission system for optical transmission with the capacity of 100 Gb/S over a distance of 9,000 km or more includes an light sending station for outputting an optical signal in the band of 1.55 .mu.m, and an light receiving station connected to the light sending station by an optical fiber transmission line. The optical fiber transmission line includes a plurality of transmission optical fibers connected by optically amplifying repeaters. Each transmission optical fiber is a single-mode optical fiber having an effective cross-sectional area of 80 .mu.m.sup.2 or more. Each optically amplifying repeater includes an erbium-doped optical fiber for pumping in 0.98 .mu.m, WDM coupler for demultiplexing and multiplexing 1.55 .mu.m and 0.98 .mu.m wavelengths, optical isolator and gain equalizing filter, which are connected in series, so as to locate output light from an pumping laser for oscillation in 0.98 .mu.m onto the erbium-doped optical fiber through the WDM coupler.

摘要翻译： 在距离为9000km以上的100Gb / S的光传输用光传输系统中，包括用于输出1.55μm的频带的光信号的光发送站和与该光连接的光接收站 发送站由光纤传输线。 光纤传输线包括通过光学放大转发器连接的多个传输光纤。 每个传输光纤是有效横截面积为80μm或更大的单模光纤。 每个光放大中继器包括掺铒光纤，用于泵浦0.98μm的WDM耦合器，用于多路复用和复用1.55μm和0.98μm波长，光隔离器和增益均衡滤波器，它们串联连接，以便定位 将来自泵浦激光器的光输出通过WDM耦合器在0.98μm振荡到掺铒光纤上。

公开(公告)号：US5930015A

公开(公告)日：1999-07-27

申请号：US794048

申请日：1997-02-03

申请人： Takaya Yamamoto ,  Katsuyuki Yamazaki ,  Shu Yamamoto ,  Yotaro Yatsuzuka

发明人： Takaya Yamamoto ,  Katsuyuki Yamazaki ,  Shu Yamamoto ,  Yotaro Yatsuzuka

IPC分类号： H04J14/00 ,  H04B10/03 ,  H04B10/07 ,  H04B10/079 ,  H04B10/27 ,  H04B10/293 ,  H04B10/524 ,  H04B10/564 ,  H04B10/572 ,  H04J1/00 ,  H04J14/02 ,  H04J14/08 ,  H04L7/00 ,  H04L7/04

CPC分类号： H04J14/02 ,  H04B10/2587 ,  H04J14/08 ,  H04L7/0075 ,  H04L7/041

摘要： An optical access system is disclosed in which subscribers' terminals and optical coupler-splitters of nodes are maintenance-free and required control is effected on the part of the central office alone. At a first position, down-link optical digital signals are generated, which are made "1s" every n bits (n being an integer equal to greater than 2). The optical digital signals, except a train of optical pulses every n bits, are sent as down-link information over a transmission line. At a second position, the optical digital signals, except the optical pulse train, are demodulated from the transmitted down-link optical digital signals, and in an optical gate circuit on which the down-link optical digital signals are incident, up-link optical digital signals based on up-link message data is formed in synchronization with the optical pulses corresponding to every n-th bits and is transmitted to the first position over the transmission line. At the first position, the up-link optical digital signals sent from the second position is received from the transmission line.

摘要翻译： 公开了一种光接入系统，其中节点的用户终端和光耦合器分离器是免维护的，并且仅在中心局的部分进行所需的控制。 在第一位置，产生下行链路光数字信号，其每n位（n等于大于2的整数）被制成“1”。 每n位除了一列光脉冲之外的光数字信号通过传输线作为下行链路信息发送。 在第二位置，除了光脉冲序列之外的光数字信号从发送的下行链路光数字信号中解调，并且在下行链路光数字信号入射的光栅电路中，上行链路光 基于上行链路消息数据的数字信号与对应于每个第n位的光脉冲同步地形成，并通过传输线传输到第一位置。 在第一位置，从传输线接收从第二位置发送的上行链路光数字信号。

公开(公告)号：US5912750A

公开(公告)日：1999-06-15

申请号：US779780

申请日：1997-01-07

申请人： Noriyuki Takeda ,  Takayuki Miyakawa ,  Hidenori Taga ,  Shigeyuki Akiba ,  Shu Yamamoto

发明人： Noriyuki Takeda ,  Takayuki Miyakawa ,  Hidenori Taga ,  Shigeyuki Akiba ,  Shu Yamamoto

IPC分类号： G02B6/02 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04J14/0221

摘要： Wavelength multiplexed optical signals which are input into a first optical amplifier from an optical transmission terminal device over an optical fiber are differently amplified in respective wavelengths due to unevenness of gain of the optical amplifiers and then output. By providing M-transmission optical filters having an M-type transmission characteristic to cancel gain deviation of the optical amplifiers in respective wavelengths, a flat gain characteristic can be achieved even after the optical signals are transmitted via a plurality of optical amplifiers and a plurality of M-transmission optical filters. Also, by removing ASE in a wavelength range of 1.53 .mu.m which prevents signal amplification in a wavelength range of 1.55 .mu.m, the wavelength multiplexed optical signals which are sufficiently amplified can be transmitted to an optical reception terminal device over the optical fiber.

摘要翻译： 通过光纤从光传输终端装置输入到第一光放大器中的波分复用光信号由于光放大器的增益不均匀而在各波长中不同地被放大，然后被输出。 通过提供具有M型传输特性的M传输光学滤波器来消除各个波长的光放大器的增益偏差，即使在通过多个光放大器传输光信号和多个光放大器之后，也可以获得平坦的增益特性 M型传输滤光片。 此外，通过在1.53μm的波长范围内去除ASE，防止在1.55μm的波长范围内的信号放大，可以充分放大的波长复用光信号可以通过光纤传输到光接收终端装置。

公开(公告)号：US5898502A

公开(公告)日：1999-04-27

申请号：US878543

申请日：1997-06-19

申请人： Yukio Horiuchi ,  Shu Yamamoto

发明人： Yukio Horiuchi ,  Shu Yamamoto

IPC分类号： G01J1/16 ,  G01J9/00 ,  H04B10/07 ,  H04B10/079 ,  H04B110/08 ,  G01J3/51

CPC分类号： G01J1/1626 ,  G01J9/00

摘要： In an optical wavelength monitoring apparatus for easily monitoring wavelength deviation, light introduced from a laser source 10 to an optical transmission line 12 is divided by directional couplers 14, 20. Optical output of the directional coupler 14 is converted into an electrical signal by a photodiode 16, and logarithmic-amplified by a logarithmic amplifier 18. Optical output of the directional coupler 20 is introduced to a photodiode 26 via an optical filter 24. The optical filter 24 is an optical element whose transmittance decreases as the incident light deviates from a specific wavelength .lambda.a. Optical output from the optical filter 24 is converted into an electrical signal by a photodiode 26, and logarithmic-amplified by a logarithmic amplifier 28. A differential amplifier 30 outputs a difference between outputs of the amplifiers 18, 28. A comparator 32 compares the output of the differential amplifier 30 with an alarm threshold Vref, and outputs an alarm-on signal when the difference is Vref or higher.

摘要翻译： 在用于容易监测波长偏差的光波长监测装置中，从激光源10引入到光传输线12的光被定向耦合器14,20分开。定向耦合器14的光输出由光电二极管转换成电信号 定向耦合器20的光输出通过滤光器24被引入光电二极管26.光学滤光器24是一种光学元件，其透光率随着入射光偏离特定的光学元件而降低 波长λa。 来自滤光器24的光输出由光电二极管26转换成电信号，由对数放大器28对数放大。差分放大器30输出放大器18,28的输出之间的差。比较器32将输出 差分放大器30具有报警阈值Vref，并且当差值为Vref或更高时输出报警开启信号。

公开(公告)号：US5790289A

公开(公告)日：1998-08-04

申请号：US651218

申请日：1996-05-22

申请人： Hidenori Taga ,  Noriyuki Takeda ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Hidenori Taga ,  Noriyuki Takeda ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： H04J14/00 ,  H04B10/077 ,  H04B10/25 ,  H04B10/2507 ,  H04B10/294 ,  H04B10/54 ,  H04B10/564 ,  H04J14/02

CPC分类号： H04B10/2935 ,  H04J14/0221

摘要： A wavelength division multiplexed (WDM) optical communication method and apparatus uses a pre-emphasis technique to adjust the attenuation or amplification of a particular optical channel at a transmitter terminal to produce identical signal-to-noise ratios for all of the optical channels at a receiver terminal. The pre-emphasis adjustments to the transmitted signals are made on the basis of signal-to-noise ratio measurements performed at the receiver terminal. The signal-to-noise ratio values for each channel are transmitted through a facing line that is also used to transmit data along optical communication lines from the receiver terminal back to the transmitter terminal. The present invention also provides a method and apparatus for monitoring optical transmission paths for the deterioration of optical amplifier repeaters or an optical fiber. The optical signals are then adjusted to account for the location of the particular amplifier or fiber that has deteriorated.

摘要翻译： 波分多路复用（WDM）光通信方法和装置使用预加重技术来调整在发射机终端处的特定光信道的衰减或放大，以便在所有光信道处产生相同的信噪比 接收终端。 基于在接收机终端执行的信噪比测量，对发射信号进行预加重调整。 每个通道的信噪比值通过面对线传输，该对面线也用于沿着光通信线路将数据从接收机终端发送回发射机终端。 本发明还提供了一种用于监测光放大器中继器或光纤的劣化的光传输路径的方法和装置。 然后调整光信号以考虑已劣化的特定放大器或光纤的位置。

公开(公告)号：US5710660A

公开(公告)日：1998-01-20

申请号：US606653

申请日：1996-02-26

申请人： Shu Yamamoto ,  Hidenori Taga ,  Noboru Edagawa ,  Shigeyuki Akiba ,  Kuniaki Motoshima ,  Katsumi Takano ,  Tadayoshi Kitayama

发明人： Shu Yamamoto ,  Hidenori Taga ,  Noboru Edagawa ,  Shigeyuki Akiba ,  Kuniaki Motoshima ,  Katsumi Takano ,  Tadayoshi Kitayama

IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/13 ,  H01S3/131 ,  H01S3/00 ,  C02B6/00

CPC分类号： H04B10/2931 ,  H01S3/06758 ,  H01S3/1301

摘要： This invention provides an optical amplifier which has low noise characteristics for a wide range of input signal electric power. The optical amplifier has a plurality of cascaded optical amplifying units, a signal level detector, and a pump-source controller. The pump-source controller changes controlling objects from a pump-source corresponding to a first one of the optical amplifying units to a pump-source corresponding to a second one of the optical amplifying units according to a detection level of the signal level detector from a low level to a high level. When the detection level is outside of a control object range, the optical amplifier controls an output from the pump-source to stabilize. When the detection level is within the control object range, the optical amplifier controls an output from a pump-source of each of optical amplifying units according to the detection level.

摘要翻译： 本发明提供一种对于宽范围的输入信号电力具有低噪声特性的光放大器。 光放大器具有多个级联的光放大单元，信号电平检测器和泵源控制器。 泵源控制器根据来自信号电平检测器的检测电平，将对应于第一光放大单元的泵浦源的控制对象改变为对应于第二光放大单元的泵浦源 低水平到高水平。 当检测电平超出控制对象范围时，光放大器控制泵源的输出稳定。 当检测水平处于控制对象范围内时，光放大器根据检测水平控制每个光放大单元的泵浦源的输出。

公开(公告)号：US5138621A

公开(公告)日：1992-08-11

申请号：US680393

申请日：1991-04-04

申请人： Koji Goto ,  Shu Yamamoto ,  Yukio Horiuchi ,  Hiroharu Wakabayashi

发明人： Koji Goto ,  Shu Yamamoto ,  Yukio Horiuchi ,  Hiroharu Wakabayashi

IPC分类号： G02B6/02 ,  C03C13/04 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/0915 ,  H01S3/094 ,  H01S3/10 ,  H01S3/13 ,  H01S3/131 ,  H04B10/032 ,  H04B10/079 ,  H04B10/29 ,  H04B10/293

CPC分类号： H01S3/1301 ,  H01S3/094003 ,  H01S3/09408 ,  H01S5/06825

摘要： A pumping light source drive system is disclosed for driving pumping light sources of an optical amplifier which is composed of a rare earth doped optical fiber doped with a rare earth element and said pumping light sources. The pumping light sources are always held in operation. The output signal power at the output of the rare earth doped optical fiber or the combined power of the pumping light sources is detected and compared with a predetermined reference power to control the output power of the pumping light sources, so that the output signal power or the combined power of the pumping light sources reaches a predetermined value.

摘要翻译： 公开了一种用于驱动由掺杂有稀土元素的稀土掺杂光纤和所述泵浦光源组成的光放大器的泵浦光源的泵浦光源驱动系统。 泵浦光源始终保持运行。 检测稀土掺杂光纤的输出端的输出信号功率或泵浦光源的组合功率，并将其与预定的参考功率进行比较，以控制泵浦光源的输出功率，使输出信号功率或 泵浦光源的组合功率达到预定值。