公开(公告)号：US06768872B1

公开(公告)日：2004-07-27

申请号：US09670003

申请日：2000-09-25

申请人： Takehiro Tsuritani ,  Keiji Tanaka ,  Noboru Edagawa ,  Masatoshi Suzuki

发明人： Takehiro Tsuritani ,  Keiji Tanaka ,  Noboru Edagawa ,  Masatoshi Suzuki

IPC分类号： H04J1402

CPC分类号： H04B10/25253

摘要： An optical transmitter outputs WDM signal lights comprising signal lights with 100 wavelengths of 10 Gbit/s, onto an optical transmission fiber. In the optical transmission line, a transmission fiber and a local area dispersion compensation fiber are disposed per repeater span defined by an optical amplification repeater, the local area dispersion compensation fiber is for compensating the average chromatic dispersion in the repeater span to become 2 ps/nm/km as well as a dispersion slope to become zero, and a wide area dispersion compensation fiber for compensating the average chromatic dispersion to become −0.2 ps/nm/km as well as the dispersion slope to become zero is disposed per predetermined number of optical repeater spans. The optical transmission fiber comprises a single mode optical fiber with large core diameter having a zero dispersion wavelength at a 1.3 &mgr;m band and plus chromatic dispersion at a signal wavelength band (a 1.55 &mgr;m band). The optical amplification repeater comprises an erbium-doped optical fiber to be pumped by a 0.98 &mgr;m band pumping light.

摘要翻译： 光发射机将包含10兆比特/秒波长的信号光的WDM信号灯输出到光传输光纤上。 在光传输线路中，在由光放大中继器限定的每个中继器跨度上布置传输光纤和局部色散补偿光纤，局部色散补偿光纤用于将中继器跨度中的平均色散补偿为2ps / nm / km以及色散斜率为零，并且将用于将平均色散补偿为-0.2ps / nm / km以及将色散斜率补偿为零的广域色散补偿光纤设置为每个预定数量的 光中继器。 光传输光纤包括在1.3mum波段处具有零色散波长的大芯径的单模光纤，并且在信号波长带（1.55μm波段）处加上色散。 光放大中继器包括一个掺铒光纤，通过0.98 mum带激发光泵浦。

公开(公告)号：US06748178B2

公开(公告)日：2004-06-08

申请号：US09795245

申请日：2001-02-26

申请人： Takayuki Miyakawa ,  Masatoshi Suzuki ,  Noboru Edagawa

发明人： Takayuki Miyakawa ,  Masatoshi Suzuki ,  Noboru Edagawa

IPC分类号： H04B1018

CPC分类号： H04B10/2916 ,  H04B2210/003

摘要： An optical fiber (12a) with a large effective core area and a large chromatic dispersion value is disposed on an input side of signal light, and an optical fiber (12b) with a small effective core area and a small chromatic dispersion value or a chromatic dispersion value of negative polarity is disposed on an output side of the signal light. A pumping light source (14) generates pumping light of 1450 nm to cause Raman amplification of 1550 nm in the optical fiber (12b). The output light from the pumping light source (14) enters the optical fiber (12b) from the back through a WDM optical coupler (16). Provided that y=(Pin−&agr;)/(Pp·10 Log L) where input power of the optical fiber (12a) (i.e. output power of an optical transmitter (10)) is Pin, a total loss of the optical fibers (12a and 12b) is &agr;, pumping power for Raman amplification is Pp, and a total length of the optical fibers (12a and 12b) is L, the relation between ratio x (0≦x≦1) of the optical fiber (12b) and y is expressed as y=6.63×10−2x−0.077. Here, the satisfactory x value is in a range from +0.2 to −0.2 of the y value.

摘要翻译： 具有大的有效核​​心面积和大的色散值的光纤（12a）被布置在信号光的输入侧，并且具有小的有效核心区域和小的色散值或色度的光纤（12b） 负极性的色散值被设置在信号光的输出侧。 泵浦光源（14）产生1450nm的泵浦光，以在光纤（12b）中引起1550nm的拉曼放大。 来自泵浦光源（14）的输出光通过WDM光耦合器（16）从后面进入光纤（12b）。 假设光纤（12a）的输入功率（即，光发射器（10）的输出功率））为Pin的y =（Pin-alpha）/（Pp.10Log L），光纤的总损耗 12a和12b）为α，用于拉曼放大的泵送功率为Pp，光纤（12a和12b）的总长度为L，光纤的比例x（0 <= x <= 1） 12b），y表示为y = 6.63×10 -2 x-0.077。 这里，满意的x值在y值的+0.2〜-0.2的范围内。

公开(公告)号：US06728437B2

公开(公告)日：2004-04-27

申请号：US09882352

申请日：2001-06-15

申请人： Noboru Edagawa ,  Masatoshi Suzuki

发明人： Noboru Edagawa ,  Masatoshi Suzuki

IPC分类号： G02B626

CPC分类号： H01S3/09415 ,  H01S3/09408 ,  H01S3/302

摘要： An object of the present invention is to prevent an increase of the degree of polarization of an output pumping light even if one of pumping light sources has a failure. Laser diodes (30a, 30b) are composed of FP-LDs made of InGaAsP to laser-oscillate at 1480 nm band. The outputs from the laser diodes (30a, 30b) enter a polarizing beam splitter (32) in orthogonal state of polarization and are combined there. The combined light by the polarizing beam splitter (32) enters a depolarizing element (34) and is depolarized there.

摘要翻译： 本发明的一个目的是防止输出泵浦光的偏振度的增加，即使其中一个泵浦光源有故障。 激光二极管（30a，30b）由由InGaAsP制成的FP-LD组成，以1480nm波段激光振荡。 来自激光二极管（30a，30b）的输出以正交偏振态进入偏振光束分离器（32）并在其中组合。 由偏振分束器（32）组合的光进入去极化元件（34），并在那里去极化。

公开(公告)号：US06549711B1

公开(公告)日：2003-04-15

申请号：US09240593

申请日：1999-02-01

申请人： Tadakatsu Shimada ,  Kazuo Koya ,  Noboru Edagawa ,  Masatoshi Suzuki ,  Itsuro Morita

发明人： Tadakatsu Shimada ,  Kazuo Koya ,  Noboru Edagawa ,  Masatoshi Suzuki ,  Itsuro Morita

IPC分类号： G02B602

CPC分类号： G02B6/02247 ,  C03B37/027 ,  C03B2203/06 ,  C03B2203/18 ,  C03B2203/36 ,  G02B6/02 ,  G02B6/02028

摘要： The soliton pulse compression optical fiber comprises a core and a clad that surrounds the core for compressing the injected light pulse in width. The maximum relative index difference between the core and the clad is between about 1.2% and 2.5%. The core diameter of the soliton pulse compression optical fiber varies along the length of the soliton pulse compression optical fiber and the core has a step-like refractive index distribution. The optical fiber perform of the soliton pulse compression optical fiber comprises a core preform, which is to be a core of the soliton pulse compression optical fiber, and a clad preform that surrounds the core preform. The maximum relative index difference between the core perform and the clad preform is also between about 1.2% and 2.5%.

摘要翻译： 孤子脉冲压缩光纤包括芯和围绕芯的包层，用于压缩注入的光脉冲的宽度。 芯和包层之间的最大相对折射率差在约1.2％至2.5％之间。 孤子脉冲压缩光纤的芯直径沿着孤子脉冲压缩光纤的长度变化，并且芯具有阶梯状折射率分布。 孤子脉冲压缩光纤的光纤执行包括作为孤子脉冲压缩光纤的核心的芯预制棒和围绕芯预制棒的包层预制棒。 核心执行和包层预制件之间的最大相对折射率差异也在约1.2％至2.5％之间。

公开(公告)号：US06445478B1

公开(公告)日：2002-09-03

申请号：US09764271

申请日：2001-01-19

申请人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

发明人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

IPC分类号： H04B1004

摘要： Detection of an optical pulse position uses an optical pulse string with a determined repetitive ratio and an electric clock signal with a same frequency as the repetitive ratio of the optical pulse string. A phase of the electric clock signal oscillator is shifted and supplied to an optical modulator. The optical modulator modulates the optical pulse string based on the electric clock signal and outputs a modulated optical signal. A photo detector converts the modulated optical signal output from the optical modulator to an electric signal. The phase shift amount of the electric clock signal is controlled to maximize an output from the photo detector. Additionally, a dither signal may be used in the control of the phase shift, more than the optical modulator may be employed, and/or more than color light source may be employed. The use of at least one of feed forward and feedback control provided by maximizing an output of the photo detector allows an optical pulse having a short width to be realized.

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：US5726789A

公开(公告)日：1998-03-10

申请号：US617614

申请日：1996-03-19

申请人： Yukio Horiuchi ,  Masatoshi Suzuki

发明人： Yukio Horiuchi ,  Masatoshi Suzuki

IPC分类号： H04B10/516 ,  G02F1/01 ,  G02F1/03 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/508 ,  H04B10/524 ,  H04B10/54 ,  H04B10/61 ,  H04B10/04

CPC分类号： G02F1/0121 ,  G02F1/0327 ,  G02F2203/26

摘要： A device for modulating optical short pulses, while preventing a pulse compression optical fiber from degradation of the transmission characteristics even if the length of the pulse compression optical fiber varies, utilizes an optical short pulse generator 1, a pulse compression optical fiber 2, an optical divider 3, a photodetector 6, an amplifier 7, a band pass filter 8, a phase comparator 9, a loop filter 11, and a driving signal generator 12. The loop which comprises loop filter 11 and driving signal generator 12 controls an oscillation frequency in a VCO 12-1 so that the phase of a compressed optical pulse fed to an optical intensity modulator 4 is identical to the phase of a data signal that is synchronized with a reference clock and used to modulate the compressed optical pulse. In this manner, the extinction ratio of the modulation output is not degraded even if the length of the pulse compression optical fiber 2 varies due to ambient temperature variations.

摘要翻译： 一种用于调制光学短脉冲的装置，即使脉冲压缩光纤的长度变化也能防止脉冲压缩光纤降低传输特性，利用光学短脉冲发生器1，脉冲压缩光纤2，光学 分频器3，光电检测器6，放大器7，带通滤波器8，相位比较器9，环路滤波器11和驱动信号发生器12.包括环路滤波器11和驱动信号发生器12的环路控制振荡频率 在VCO 12-1中，使得馈送到光强度调制器4的压缩光脉冲的相位与与参考时钟同步并用于调制压缩的光脉冲的数据信号的相位相同。 以这种方式，即使脉冲压缩光纤2的长度由于环境温度变化而变化，调制输出的消光比也不会降低。

公开(公告)号：US5721642A

公开(公告)日：1998-02-24

申请号：US736673

申请日：1996-10-25

申请人： Atsushi Shibayama ,  Masatoshi Suzuki ,  Takanori Fujita

发明人： Atsushi Shibayama ,  Masatoshi Suzuki ,  Takanori Fujita

IPC分类号： G02B15/177 ,  G02B15/14

CPC分类号： G02B15/177

摘要： A zoom lens is composed of a first lens group of a negative refractive power, a second lens group of a positive refractive power and a third lens group of a positive refractive power, in which, in the zooming operation from the wide angle end to the telephoto end, the distance between the first and second lens groups decreases and the distance between the second and third lens groups varies.

摘要翻译： 变焦透镜由负屈光力的第一透镜组，正屈光力的第二透镜组和正折射力的第三透镜组组成，其中在从广角端到第二透镜组的变焦操作中， 长焦端，第一和第二透镜组之间的距离减小，并且第二和第三透镜组之间的距离变化。

公开(公告)号：US5715097A

公开(公告)日：1998-02-03

申请号：US652794

申请日：1996-05-23

申请人： Atsushi Shibayama ,  Takanori Fujita ,  Masatoshi Suzuki

发明人： Atsushi Shibayama ,  Takanori Fujita ,  Masatoshi Suzuki

IPC分类号： G02B13/18 ,  G02B15/16 ,  G02B15/177 ,  G02B15/20 ,  G02B27/64 ,  G02B15/14 ,  G02B15/22

CPC分类号： G02B15/177 ,  G02B27/646

摘要： A zoom lens structured so that a substantially constant amount of movement of a focusing lens group is required for focusing on objects at the same distance regardless of the zoom position even when an inner focusing method is implemented. The zoom lens includes in order from an object side, a first lens group which has a negative refractive power and a second lens group which has a positive refractive power, wherein zooming is executed by changing a distance between the first lens group and the second lens group, wherein the second lens group includes, in order from the object side, a front group which has a positive refractive power and a rear group which has a positive refractive power, and wherein focusing from an object at a far distance to an object at a close distance is executed by moving the front group towards an image side.

摘要翻译： 变焦透镜被构造成使得即使实现内部聚焦方法，聚焦透镜组的运动也需要大致恒定的聚焦在相同距离的物体上而与变焦位置无关。 变焦透镜从物体侧依次包括具有负折光力的第一透镜组和具有正折光力的第二透镜组，其中通过改变第一透镜组和第二透镜之间的距离来执行变焦 组，其中所述第二透镜组从物体侧依次包括具有正折射光焦度的正面组和具有正折射光焦度的后组，并且其中从远距离的物体聚焦到物体 通过将前组移动到图像侧来执行近距离。