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：US5589969A

公开(公告)日：1996-12-31

申请号：US542058

申请日：1995-10-12

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

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

IPC分类号： H04J14/00 ,  H04B10/2507 ,  H04B10/2563 ,  H04J14/02

CPC分类号： H04B10/2572 ,  H04J14/0224

摘要： The present invention provides a wavelength division multiplexed optical fiber transmission equipment which can increase the number of channels of the WDM signal by reducing a required bandwidth of optical signals while suppressing an interference between signals caused by four-wave mixing. A WDM optical transmitting terminal comprises five or more optical transmitters and the wavelengths of optical signals from the optical transmitters are set such that the spacing between the wavelengths of two signals is re-used as the spacing between the wavelengths of other two signals separated by the above signals by two or more waves and there is no periodicity in the channel spacing s. For instance, the wavelengths of the optical signals are set as shown in FIG. 1. As the result, deterioration in the transmission characteristics of the optical signals can be effectively reduced and, at the same time, the maximum number of channels of the WDM signal can be increased. To the WDM optical transmitting terminal is added polarization state controllers for controlling the state of polarization such that the states of polarizations of adjacent signals cross each other at an output of the WDM optical transmitting terminal.

摘要翻译： 本发明提供一种波分复用光纤传输设备，其可以通过减少光信号的所需带宽，同时抑制由四波混频引起的信号之间的干扰，从而增加WDM信号的信道数。 WDM光发射终端包括五个或更多个光发射机，并且来自光发射机的光信号的波长被设置为使得两个信号的波长之间的间隔被重新使用为由其间隔开的其它两个信号的波长之间的间隔 上述信号由两个或更多个波，并且在信道间隔s中没有周期性。 例如，光信号的波长如图5所示设定。 结果，可以有效地降低光信号的传输特性的劣化，并且同时可以增加WDM信号的最大信道数。 对于WDM光发射终端，增加了用于控制极化状态的偏振状态控制器，使得相邻信号的偏振状态在WDM光发送终端的输出端彼此交叉。

公开(公告)号：US5559910A

公开(公告)日：1996-09-24

申请号：US452028

申请日：1995-05-26

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

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

IPC分类号： G02F1/35 ,  H04B10/2507 ,  H04B10/2525 ,  H04B10/2563 ,  G02B6/28

CPC分类号： H04B10/25253 ,  H04B10/2563

摘要： It is the object of the present invention to optimize the degradation due to the four-wave mixing of wavelength multiplexed signals and the distortion due to the chromatic dispersion, thereby to provide a wavelength division multiplexed optical fiber transmission equipment having good transmission characteristics. A WDM transmitting terminal consists of four transmitters of channels 1 to 4, and a wavelength-division multiplexer. Further, a WDM receiving terminal consists of an equalization optical fiber, a wavelength-division demultiplexer, and four receivers of the channels 1 to 4. The WDM transmitting terminal and the WDM receiving terminal are interconnected by transmission optical fibers and an optical amplifier. The equipment is designed so that the wavelengths .lambda..sub.1, .lambda..sub.2, .lambda..sub.3 and .lambda..sub.4 of the optical signals output from the transmitters all lie on the short-wavelength side with respect to the average zero-dispersion wavelength .lambda..sub.0. This allows the distortion due to the four-wave mixing of a wavelength multiplexed signal to be reduced. The equalization optical fiber has a chromatic dispersion of a sign opposite to the chromatic dispersion of the optical fibers forming a transmitting path, thereby for compensating the chromatic dispersion of the optical signals output from the transmitters.

摘要翻译： 本发明的目的是优化由于波分复用信号的四波混频和由于色散导致的失真的劣化，从而提供具有良好传输特性的波分复用光纤传输设备。 WDM发射终端由通道1至4的四个发射器和波分复用器组成。 此外，WDM接收终端由均衡光纤，波分多路分解器，以及通道1〜4的4个接收器构成.WDM发送终端和WDM接收终端由发送光纤和光放大器互连。 设备的设计使得从发射机输出的光信号的波长λ1，λ2，λ3和λ4相对于平均零色散波长λ0位于短波长侧。这允许 由于要减少的波长复用信号的四波混频引起的失真。 均衡光纤具有与形成发送路径的光纤的色散相反的符号的色散，从而补偿从发送器输出的光信号的色散。

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：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：US06181449B2

公开(公告)日：2001-01-30

申请号：US09032537

申请日：1998-02-27

申请人： Hidenori Taga ,  Kaoru Imai ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Hidenori Taga ,  Kaoru Imai ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： H04J1402

CPC分类号： H04B10/2935 ,  H04B10/25073 ,  H04B10/25133 ,  H04J14/0221

摘要： A wavelength division multiplexed optical processing device and an optical communication transmission path which are capable of significantly improving the transmission characteristic of wavelength division multiplexed optical signals. A wavelength division multiplexed optical processing device is formed by a first arrayed optical waveguide for demultiplexing entered wavelength division multiplexed optical signals, and outputting demultiplexed optical signals; a plurality of correction units for correcting respective optical signals demultiplexed by the first arrayed optical waveguide; and a second arrayed optical waveguide for multiplexing optical signals corrected by the correction unit, and outputting multiplexed optical signals. An optical communication transmission path is formed by an optical transmission path; and at least one wavelength division multiplexed optical processing device using an arrayed optical waveguide having a transmission wavelength characteristic with a flat top shape, which is inserted into the optical transmission path at a prescribed interval.

摘要翻译： 能够显着提高波分复用光信号的传输特性的波分复用光处理装置和光通信传输路径。 波分复用光处理装置由第一阵列光波导形成，用于对输入的波分复用光信号进行解复用，并输出解复用的光信号; 多个校正单元，用于校正由第一阵列光波导解复用的各个光信号; 以及第二阵列光波导，用于复用由所述校正单元校正的光信号，并且输出复用的光信号。 光通信传输路径由光传输路径形成; 以及使用具有平坦顶部形状的透射波长特性的排列光波导的至少一个波分复用光学处理装置，其以规定的间隔插入到光传输路径中。

公开(公告)号：US5892608A

公开(公告)日：1999-04-06

申请号：US770455

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 ,  H04B10/06

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：US5629795A

公开(公告)日：1997-05-13

申请号：US521973

申请日：1995-08-31

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

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

IPC分类号： H04B10/2507 ,  H04B10/2525 ,  H04B10/29 ,  H04B10/291 ,  H01S3/00 ,  H04B10/02

CPC分类号： H04B10/25253

摘要： An optical amplifying-repeating transmission system is disclosed which is composed of an optical fiber for transmitting a lightwave signal with digital information added to return-to-zero lightwave pulses and a plurality of optical amplifying repeaters inserted in the optical fiber for transmission use. The mean value of wavelengths at which the wavelength dispersion of the optical fiber is zero is smaller than the wavelength of the lightwave signal which is transmitted over the system. The accumulated wavelength dispersion value of the optical fiber tends to increase with the distance of transmission, from a macroscopic viewpoint. The optical fiber for transmission is divided into a plurality of sections. In accordance with the accumulated wavelength dispersion value of the optical fiber in each section except at least the last one, a wavelength dispersion medium, which locally changes the wavelength dispersion in a manner to cancel the accumulated wavelength dispersion in the section at the wavelength of the lightwave signal, is inserted in the section to eliminate the accumulation of the timing jitter.

摘要翻译： 公开了一种光放大重复传输系统，其由用于传输光波信号的光纤与添加到归零光波脉冲的数字信息以及插入光纤中的多个光放大中继器组成，用于传输使用。 光纤的波长色散为零的波长的平均值小于在系统上传输的光波信号的波长。 从宏观的观点来看，光纤的累积波长色散值随着透射距离而增加。 用于传输的光纤被分成多个部分。 根据除了至少最后一个部分之外的每个部分中的光纤的累积波长色散值，波长色散介质以局部改变波长色散的方式来消除在波长的波长处的部分中的累积波长色散 光波信号，插入该部分以消除定时抖动的累积。

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。