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1. 发明授权

US06952309B1 Optical amplifier and optical amplification method 失效
标题翻译：光放大器和光放大法
公开(公告)号：US06952309B1
公开(公告)日：2005-10-04
申请号：US09667576
申请日：2000-09-22
申请人： Tetsufumi Tsuzaki , Masayuki Nishimura , Masayuki Shigematsu , Hitoshi Hatayama , Eisuke Sasaoka
发明人： Tetsufumi Tsuzaki , Masayuki Nishimura , Masayuki Shigematsu , Hitoshi Hatayama , Eisuke Sasaoka
IPC分类号： G02F1/01 , G02F1/313 , H01S3/00 , H01S3/067 , H01S3/10 , H01S3/13
CPC分类号： H01S3/06758 , H01S3/06754 , H01S3/10007 , H01S3/10023 , H01S3/1301 , H01S2301/04 , H04B10/2941 , H04B10/2942 , H04B10/296
摘要： A optical filter has a loss spectrum whose gradient dL/dλ of a loss L (dB) with respect to the wavelength λ (nm) is variable in the wavelength band of multiplexed signal light. A control circuit detects each power of signal light components demultiplexed by an optical coupler and controls the power of optical pumping light to be supplied to an optical amplification section from an optical pumping light sources such that the power of output signal light has a predetermined target value. The control circuit also controls the gradient dL/dλ of the optical filter on the basis of powers of the signal light components.
摘要翻译：滤光器具有损耗谱，其相对于波长λ（nm）的损耗L（dB）的梯度dL /dlλ在复用信号光的波长带中是可变的。控制电路检测由光耦合器解复用的信号光分量的每个功率，并且控制从光泵浦光源提供给光放大部分的光泵浦光的功率，使得输出信号光的功率具有预定的目标值。控制电路还基于信号光分量的功率来控制滤光器的梯度dL / dl。

2. 发明授权

US06819829B2 Optical communication system 有权
标题翻译：光通信系统
公开(公告)号：US06819829B2
公开(公告)日：2004-11-16
申请号：US10058326
申请日：2002-01-30
申请人： Tetsufumi Tsuzaki , Masayuki Nishimura
发明人： Tetsufumi Tsuzaki , Masayuki Nishimura
IPC分类号： G02B628
CPC分类号： H04B10/2935 , H01S3/06754 , H01S3/06758 , H01S3/094003 , H01S3/302 , H04B10/2916
摘要： The present invention relates to an optical communication system having a flat gain spectrum and an excellent pumping efficiency in a signal wavelength band, and comprising a structure which is realizable/operable at a low cost. This optical communication system comprises an optical transmission line including a plurality of Raman amplification optical fibers, and pumping light suppliers for supplying pumping light to the Raman amplification optical fibers. In particular, two Raman amplification optical fibers selected from the plurality of Raman amplification optical fibers included in the optical transmission line differ from each other in at least one of the wavelength at which the gain of Raman amplification becomes the highest, and the number of channels at which the gain of Raman amplification is maximum. Such a structure flattens the gain of Raman amplification viewed from the whole optical transmission line from a transmitter to a receiver within the signal wavelength band even when the gain spectrum of Raman amplification in each of the Raman amplification optical fibers included in the optical transmission line is not flat within the signal wavelength band.
摘要翻译：本发明涉及一种具有平坦增益谱和信号波长带优良泵浦效率的光通信系统，并且包括可以以低成本实现/可操作的结构。该光通信系统包括包括多个拉曼放大光纤的光传输线以及用于向拉曼放大光纤提供泵浦光的泵浦光供应器。特别地，选自包括在光传输线路中的多个拉曼放大光纤的两个拉曼放大光纤在拉曼放大增益变得最高的波长和通道数量中的至少一个方面彼此不同其中拉曼增益的增益是最大的。这样的结构即使在包括在光传输线路中的每个拉曼放大光纤中的拉曼放大的增益光谱是包括在光传输线路中的每个拉曼放大光纤中的拉曼放大的增益光谱是在从信号波长带内的发射机到接收机的整个光传输线路上观察到的拉曼放大的增益，在信号波长带内不平坦。

3. 发明授权

US06819477B2 Raman amplifier module and optical transmission system using the same 失效
标题翻译：拉曼放大器模块和光传输系统使用相同
公开(公告)号：US06819477B2
公开(公告)日：2004-11-16
申请号：US09911767
申请日：2001-07-25
申请人： Tetsufumi Tsuzaki , Masayuki Nishimura , Masaaki Hirano
发明人： Tetsufumi Tsuzaki , Masayuki Nishimura , Masaaki Hirano
IPC分类号： H01S3108
CPC分类号： H04B10/2916 , H04B2210/003
摘要： An optical transmission path in a Raman gain module (1) for transmitting signal light input from an input terminal (1a) and Raman-amplifying the signal light by pumping light supplied from pumping light source units (21, 22) is formed by connecting in series two Raman amplification optical fibers (11, 12) having different wavelength dispersion values. According to this arrangement, wavelength dispersion in the amplifier module (1) can be controlled using, e.g., the combination of the wavelength dispersion values of the Raman amplification optical fibers (11, 12). Hence, accumulation of dispersion into signal light and signal light transmission in an almost zero dispersion state are prevented, and degradation in signal light transmission quality due to the nonlinear optical effect is suppressed.
摘要翻译：拉曼增益模块（1）中的用于传输从输入端子（1a）输入的信号光并通过泵浦从泵浦光源单元（21,22）提供的光来对信号光进行拉曼放大的光传输路径是通过连接具有不同波长色散值的两个拉曼放大光纤（11,12）。根据这种布置，可以使用例如拉曼放大光纤（11,12）的波长色散值的组合来控制放大器模块（1）中的波长色散。因此，防止了色散在信号光中的积聚和几乎为零色散状态的信号光传输，并且抑制了由于非线性光学效应引起的信号光传输质量的劣化。

4. 发明授权

US06806999B2 Raman amplification pumping module, Raman amplifier, and optical communication system 失效
标题翻译：拉曼放大泵浦模块，拉曼放大器和光通信系统
公开(公告)号：US06806999B2
公开(公告)日：2004-10-19
申请号：US10127449
申请日：2002-04-23
申请人： Tetsufumi Tsuzaki , Motoki Kakui , Masayuki Nishimura
发明人： Tetsufumi Tsuzaki , Motoki Kakui , Masayuki Nishimura
IPC分类号： H01S300
CPC分类号： H01S3/0941 , H01S3/06725 , H01S3/06754 , H01S3/094096 , H01S3/302
摘要： The present invention provides a Raman amplification pumping module and others with a structure for effectively suppressing degradation of quality of signal light even with a breakdown in either one of a plurality of light sources. The Raman amplification pumping module is provided with light sources for emitting respective lightwaves with center wavelengths different from each other, and each of the center wavelengths of the lightwaves from these light sources is adjusted so that a difference between two center wavelengths selected therefrom is less than 6 nm.
摘要翻译：本发明提供了一种拉曼放大泵浦模块等，其具有即使在多个光源中的任一个中的击穿的情况下也可有效地抑制信号光的质量劣化的结构。拉曼放大泵浦模块设置有用于发射具有彼此不同的中心波长的各个光波的光源，并且调节来自这些光源的光波的每个中心波长，使得从其中选择的两个中心波长之间的差小于 6nm。

5. 发明授权

US07110648B2 Analog optical transmission system 有权
公开(公告)号：US07110648B2
公开(公告)日：2006-09-19
申请号：US11211097
申请日：2005-08-25
申请人： Toshiyuki Miyamoto , Tetsufumi Tsuzaki , Tatsuhiko Shitomi
发明人： Toshiyuki Miyamoto , Tetsufumi Tsuzaki , Tatsuhiko Shitomi
IPC分类号： G02B6/02 , H04J14/02 , H01S3/00
CPC分类号： H04B10/25253
摘要： The present invention relates to an analog optical transmission system having a construction for expanding an analog transmittable distance. The analog optical transmission system includes: a light transmitter outputting analog optical signals such as image signals modulated in accordance with electrical signals multiplexed on a frequency domain; a transmission line including a SMF of 20 km or less in the total length; and a light receiver. A dispersion compensating fiber compensating for the chromatic dispersion of the transmission line is arranged on the transmission line, and the dispersion compensating fiber satisfies one of the first condition that the chromatic dispersion is set at −250 ps/nm/km or less and a length is set at 1.1 km or less, and the condition that the chromatic dispersion is set at −330 ps/nm/km or less and a length is set at 1.2 km or less. Optical suppressing devices reducing the MPI noise are arranged at the end portion of the dispersion compensating fiber.

6. 发明授权

US07046428B2 Raman amplifier 失效
公开(公告)号：US07046428B2
公开(公告)日：2006-05-16
申请号：US10885046
申请日：2004-07-07
申请人： Tetsufumi Tsuzaki , Kiyotaka Murashima
发明人： Tetsufumi Tsuzaki , Kiyotaka Murashima
IPC分类号： H01S3/00
CPC分类号： H04B10/2916
摘要： Raman amplification pumping light output from a pumping light source unit is supplied to a Raman amplification optical fiber through an optical circulator. The remaining Raman amplification pumping light is detected by a light-receiving element through an optical circulator and bandpass filter. Signal light that has reached a Raman amplifier propagates through the Raman amplification optical fiber while being Raman-amplified. A control section controls the power or spectral shape of Raman amplification pumping light output from each of N pumping light sources included in the pumping light source unit on the basis of the power of the remaining Raman amplification pumping light, which is detected by the light-receiving element. Hence, a Raman amplifier capable of easily controlling gain spectrum flattening in the signal light wavelength band can be obtained.

7. 发明申请

US20060045534A1 Analog optical transmission system 有权
标题翻译：模拟光传输系统
公开(公告)号：US20060045534A1
公开(公告)日：2006-03-02
申请号：US11211097
申请日：2005-08-25
申请人： Toshiyuki Miyamoto , Tetsufumi Tsuzaki , Tatsuhiko Shitomi
发明人： Toshiyuki Miyamoto , Tetsufumi Tsuzaki , Tatsuhiko Shitomi
IPC分类号： H04B10/12
CPC分类号： H04B10/25253
摘要： The present invention relates to an analog optical transmission system having a construction for expanding an analog transmittable distance. The analog optical transmission system includes: a light transmitter outputting analog optical signals such as image signals modulated in accordance with electrical signals multiplexed on a frequency domain; a transmission line including a SMF of 20 km or less in the total length; and a light receiver. A dispersion compensating fiber compensating for the chromatic dispersion of the transmission line is arranged on the transmission line, and the dispersion compensating fiber satisfies one of the first condition that the chromatic dispersion is set at −250 ps/nm/km or less and a length is set at 1.1 km or less, and the condition that the chromatic dispersion is set at −330 ps/nm/km or less and a length is set at 1.2 km or less. Optical suppressing devices reducing the MPI noise are arranged at the end portion of the dispersion compensating fiber.
摘要翻译：本发明涉及具有扩展模拟可传送距离的结构的模拟光传输系统。模拟光传输系统包括：光发射机，输出模拟光信号，例如根据在频域上复用的电信号调制的图像信号; 包括总长度为20公里以下的SMF的传输线; 和光接收器。补偿传输线色散的色散补偿光纤布置在传输线上，色散补偿光纤满足色散设置在-250ps / nm / km或更小的第一条件和长度设定为1.1km以下，色散设定为-330ps / nm / km以下，长度设定为1.2km以下的条件。降低MPI噪声的光抑制装置布置在色散补偿光纤的端部。

8. 发明授权

US06813065B2 Raman amplifier and optical communication system 失效
标题翻译：拉曼放大器和光通信系统
公开(公告)号：US06813065B2
公开(公告)日：2004-11-02
申请号：US09929503
申请日：2001-08-15
申请人： Tetsufumi Tsuzaki , Motoki Kakui , Shinji Ishikawa , Masashi Onishi
发明人： Tetsufumi Tsuzaki , Motoki Kakui , Shinji Ishikawa , Masashi Onishi
IPC分类号： H01S300
CPC分类号： H04B10/2916 , H01S3/06716 , H01S3/06758 , H01S3/302 , H04B2210/003
摘要： Disclosed are a gain module and an optical communication system which have gain in a broad wavelength range and are of low cost. The gain module 10 has two optical fibers 111 and 112 which differ from each other with respect to the composition of their respective optical waveguide region and which are connected in series. Because they differ from each other with respect to the quantity of their respective Stokes shift, they have gain in a different wavelength, respectively. The signal lights are introduced into the input end 10a, amplified with the gain module 10 in a wide wavelength range where an optical fiber has a Raman amplification gain, and are emitted from the output end 10b.
摘要翻译：公开了增益模块和光通信系统，其具有在宽波长范围内的增益并且具有低成本。增益模块10具有两个光纤111和112，它们相对于它们各自的光波导区域的组成而彼此不同，并且串联连接。因为它们相对于它们各自的斯托克斯位移的量彼此不同，它们分别具有不同波长的增益。信号光被引入到输入端10a中，在宽的波长范围内用增益模块10放大，其中光纤具有拉曼放大增益，并从输出端10b发射。

9. 发明授权

US07307782B2 Raman amplifier and optical communication system including the same 失效
标题翻译：拉曼放大器和光通信系统包括相同
公开(公告)号：US07307782B2
公开(公告)日：2007-12-11
申请号：US10208198
申请日：2002-07-31
申请人： Tetsufumi Tsuzaki , Motoki Kakui , Takafumi Terahara , Junichi Kumasako
发明人： Tetsufumi Tsuzaki , Motoki Kakui , Takafumi Terahara , Junichi Kumasako
IPC分类号： H01S3/00
CPC分类号： H01S3/302 , H01S3/06725 , H01S3/06754 , H01S3/094003 , H01S3/09408 , H01S3/094096
摘要： The present invention relates to a Raman amplifier where flexibility in device design considering both of Raman amplification and dispersion compensation is high. In the Raman amplifier, the Raman amplification optical fiber included in the optical amplification section and the dispersion compensating optical fiber included in the dispersion compensation section are arranged while being optically connected to each other. Since the optical amplification section and the dispersion compensation section are provided as independent optical devices, one device can be designed without being restricted to the design conditions of the other device.
摘要翻译：拉曼放大器本发明涉及考虑拉曼放大和色散补偿的器件设计中的灵活性高的拉曼放大器。在拉曼放大器中，包括在光放大部分中的拉曼放大光纤和包括在色散补偿部分中的色散补偿光纤被布置成彼此光学连接。由于光放大部分和色散补偿部分被设置为独立的光学器件，所以可以设计一个器件而不限于另一个器件的设计条件。

10. 发明授权

US06958857B2 Optical fiber component for Raman amplification, Raman amplifier and optical communications system 失效
标题翻译：用于拉曼放大的光纤元件，拉曼放大器和光通信系统
公开(公告)号：US06958857B2
公开(公告)日：2005-10-25
申请号：US10608024
申请日：2003-06-30
申请人： Tetsufumi Tsuzaki
发明人： Tetsufumi Tsuzaki
IPC分类号： G02F1/35 , H01S3/23 , H01S3/30 , H04B10/16 , H04B10/17 , H04B10/18 , H01S3/00
CPC分类号： H04B10/2537 , H04B10/2916 , H04B2210/003
摘要： The present invention relates to an optical fiber component for Raman amplification having a construction for effectively suppressing deterioration of the transmission characteristic caused by amplification of scattered light components. The optical fiber component for Raman amplification has an optical fiber for Raman amplification and is inserted at a position where the effective deterioration amount of the optical SN ratio produced by DRBS-XT (Double Rayleigh Back Scattering-Crosstalk) is 1 dB or less at the signal output terminal of the optical fiber for Raman amplification.
摘要翻译：本发明涉及用于拉曼放大的光纤部件，其具有有效地抑制由散射光成分的放大引起的透射特性的劣化的结构。用于拉曼放大的光纤部件具有用于拉曼放大的光纤，并且插入在由DRBS-XT（双瑞利背散射 - 串扰）产生的光学SN比的有效劣化量为1dB以下的位置处用于拉曼放大的光纤信号输出端。

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