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51. 发明授权

US07477446B2 Raman amplification system utilizing modulated second-order raman pumping 有权
标题翻译：拉曼放大系统利用调制二阶拉曼泵浦
公开(公告)号：US07477446B2
公开(公告)日：2009-01-13
申请号：US10530049
申请日：2002-10-04
申请人： Rainer Hainberger , Takafumi Terahara
发明人： Rainer Hainberger , Takafumi Terahara
IPC分类号： H04B10/17 , H04B10/12
CPC分类号： H01S3/06754 , H01S3/0677 , H01S3/094011 , H01S3/094073 , H01S3/094076 , H01S3/094096 , H01S3/10007 , H01S3/302 , H04B10/2916
摘要： Higher-order Raman pumping is combined with pump modulation in a Raman amplified optical communication system. First- and second-order Raman pumps are both modulated and launched in opposite direction to signals in an optical fiber. Relative timing of the pumps is controlled to optimize lateral signal power distribution along the fiber.
摘要翻译：高阶拉曼泵浦与拉曼放大光通信系统中的泵浦调制相结合。一阶和二阶拉曼泵既被调制并且与光纤中的信号相反地发射。控制泵的相对时间以优化沿着光纤的横向信号功率分布。

52. 发明授权

US07437074B2 Wavelength division multiplexing transmission system 有权
标题翻译：波分复用传输系统
公开(公告)号：US07437074B2
公开(公告)日：2008-10-14
申请号：US10809929
申请日：2004-03-26
申请人： Kentaro Nakamura , Takafumi Terahara
发明人： Kentaro Nakamura , Takafumi Terahara
IPC分类号： H04J14/02 , H04B10/04 , H04B10/08
CPC分类号： H04J14/02 , H04J14/0227 , H04J14/0241 , H04J14/0279
摘要： A WDM transmission system is provided which can multiplex/demultiplex and transmit wavelength division multiplexing signals, where signal lights have a different signal bandwidth, in a status without much deterioration of transmission quality. In the WDM transmission system, an optical receiver includes a demultiplexing unit which demultiplexes the wavelength division multiplexing signals and outputs the demultiplexed signal lights from a plurality of output ports, wherein each output port has transmission characteristics to be set such that the bandwidth of the transmission band where the light transmits and the bandwidth of the non-transmission band where light does not transmit are different, and the transmission band substantially matches with the signal band of the signal lights that are output from the output port out of the received wavelength division multiplexing signals.
摘要翻译：提供一种WDM传输系统，其能够在传输质量不会恶化的状态下复用/解复用和发送信号光具有不同信号带宽的波分复用信号。在WDM传输系统中，光接收机包括解复用单元，其解复用波分多路复用信号，并从多个输出端口输出解复用的信号光，其中每个输出端口具有传输特性以使传输带宽光传输的频带和光不发射的非传输频带的带宽不同，并且传输频带与从接收到的波分复用中输出端口输出的信号光的信号频带基本一致信号。

53. 发明授权

US07336870B2 Optical transmission system 有权
标题翻译：光传输系统
公开(公告)号：US07336870B2
公开(公告)日：2008-02-26
申请号：US11362704
申请日：2006-02-28
申请人： Hiroki Ooi , Akira Miura , Takafumi Terahara , Ichiro Nakajima
发明人： Hiroki Ooi , Akira Miura , Takafumi Terahara , Ichiro Nakajima
IPC分类号： G02B6/28
CPC分类号： H04J14/0201 , H04B10/25133
摘要： An optical transmission system includes a first/second node with a first/second dispersion compensator that performs a first/second dispersion compensation on an optical signal; and a third node that is arranged between the first/second nodes. The amounts of the first/second dispersion compensations are determined so that a cumulative dispersion of the optical signal after the second dispersion compensation is within a predetermined range.
摘要翻译：光传输系统包括具有第一/第二色散补偿器的第一/第二节点，其在光信号上执行第一/第二色散补偿; 以及布置在所述第一/第二节点之间的第三节点。确定第一/第二色散补偿的量，使得第二色散补偿之后的光信号的累积色散在预定范围内。

54. 发明申请

US20050152025A1 Raman amplification system utilizing bi-directional pumping 有权
标题翻译：拉曼放大系统采用双向泵浦
公开(公告)号：US20050152025A1
公开(公告)日：2005-07-14
申请号：US10998173
申请日：2004-11-29
申请人： Rainer Hainberger , Takafumi Terahara
发明人： Rainer Hainberger , Takafumi Terahara
IPC分类号： H01S3/067 , H01S3/094 , H01S3/30 , H04B10/2563 , H04B10/291 , H01S3/00
CPC分类号： H04B10/2916 , H01S3/06754 , H01S3/06766 , H01S3/0677 , H01S3/094011 , H01S3/094096 , H01S3/302 , H04B10/2563
摘要： In an optical transmission system utilizing bi-directional Raman amplification, propagation directions and wavelengths of Raman pumps are chosen such that four-wave mixing products among the pump wavelengths are minimized in a signal wavelength region.
摘要翻译：在利用双向拉曼放大的光传输系统中，选择拉曼泵的传播方向和波长，使得泵波长中的四波混频产物在信号波长区域中最小化。

55. 发明授权

US06693739B2 Method for gain equalization, and device and system for use in carrying out the method 有权
公开(公告)号：US06693739B2
公开(公告)日：2004-02-17
申请号：US10303040
申请日：2002-11-25
申请人： Takafumi Terahara
发明人： Takafumi Terahara
IPC分类号： H01S300
CPC分类号： H04B10/2941 , H01S3/10023 , H04B10/2935 , H04B2210/258 , H04J14/0221
摘要： The present invention relates to a method for gain equalization, for example. First, an optical transmission line including an optical amplifier having a gain changing nonlinearly with wavelength is provided (step (a)). Secondly, gain equalization of the optical transmission line is performed so as to obtain a gain changing substantially linearly with wavelength (step (b)). Finally, gain equalization of the optical transmission line is performed so as to obtain a gain remaining substantially unchanged with wavelength (step (c)). According to this method, gain equalization of the optical transmission line is performed so as to obtain a gain changing substantially linearly with wavelength. Accordingly, variations in equalization error due to changes in system condition can be easily suppressed.

56. 发明授权

US06654561B1 Method and apparatus for measuring optical signal-to-noise ratio, and pre-emphasis method and optical communication system each utilizing the method 有权
标题翻译：用于测量光信噪比的方法和装置，以及每个利用该方法的预加重方法和光通信系统
公开(公告)号：US06654561B1
公开(公告)日：2003-11-25
申请号：US09699479
申请日：2000-10-31
申请人： Takafumi Terahara , Takeshi Sakamoto , Hiroaki Tomofuji , Motoyoshi Sekiya , Makoto Murakami , Kazuo Yamane , Hiroshi Onaka
发明人： Takafumi Terahara , Takeshi Sakamoto , Hiroaki Tomofuji , Motoyoshi Sekiya , Makoto Murakami , Kazuo Yamane , Hiroshi Onaka
IPC分类号： H04B1008
CPC分类号： H04B10/07953 , H04B10/0799
摘要： In a method of measuring an optical signal-to-noise ratio according to the present invention, a partial optical signal-to-noise ratio is defined, the partial optical signal-to-noise ratio is calculated from a predetermined physical quantity, the sum of inverse numbers of the partial optical signal-to-noise ratios is calculated, and further an inverse number of the sum is calculated to acquire an optical signal-to-noise ratio. The present invention makes it possible to measure optical SNR without directly measuring ASE in the optical signal. The present invention provides a measuring apparatus, a measuring circuit, a pre-emphasis method, an optical communication system, and a controlling apparatus each utilizing this method.
摘要翻译：在根据本发明的测量光信噪比的方法中，定义部分光信噪比，从预定物理量计算部分光信噪比，总和计算出部分光信噪比的逆数，并且进一步计算和的逆数以获得光信噪比。本发明使得可以在光信号中不直接测量ASE来测量光信噪比。本发明提供一种使用该方法的测量装置，测量电路，预加重方法，光通信系统和控制装置。

57. 发明授权

US6097535A Method for optical amplification and system for carrying out the method 失效
标题翻译：光放大方法及其实施方法
公开(公告)号：US6097535A
公开(公告)日：2000-08-01
申请号：US6049
申请日：1998-01-12
申请人： Takafumi Terahara
发明人： Takafumi Terahara
IPC分类号： H01S3/067 , H01S3/06 , H01S3/10 , H04B10/2507 , H04B10/296 , H04B10/297 , H01S3/00
CPC分类号： H04B10/294 , H01S3/10007 , H01S2301/04
摘要： A method and system for optical amplification suitable for wavelength division multiplexing (WDM). Signal light is amplified to obtain amplified signal light. The amplified signal light is gain equalized so that a deviation in signal-to-noise ratio of the amplified signal light with respect to wavelength is reduced to obtain first equalized signal light. The first equalized signal light is amplified to obtain amplified equalized signal light. The amplified equalized signal light is gain equalized so that a deviation in signal power of the amplified equalized signal light with respect to wavelength is reduced. This method is characterized in that in performing optical amplification of signal light plural times gain equalization is performed in the middle stage of the optical amplification so that the deviation in signal-to-noise ratio is reduced, and gain equalization is performed after the final stage of the optical amplification so that the deviation in signal power is reduced. According to this method, gain equalization can be easily performed on both the deviation in signal power and the deviation in signal-to-noise ratio.
摘要翻译：一种适用于波分复用（WDM）的光放大方法和系统。信号光被放大以获得放大的信号光。放大的信号光被增益均衡，使得放大的信号光的相对于波长的信噪比的偏差减小，以获得第一均衡的信号光。第一均衡信号光被放大以获得放大的均衡信号光。放大后的均衡信号光被增益均衡，使得放大的均衡信号光的相对于波长的信号功率的偏差减小。该方法的特征在于，在进行光放大的信号光的情况下，在光放大的中间阶段进行多次增益均衡化，使得信噪比的偏差降低，在最后阶段进行增益均衡使得信号功率的偏差减小。根据该方法，可以容易地对信号功率的偏差和信噪比的偏差进行增益均衡化。

58. 发明授权

US6052221A Optical receiver having a function for suppressing useless intensity modulation components 失效
标题翻译：具有抑制无用强度调制成分的功能的光接收机
公开(公告)号：US6052221A
公开(公告)日：2000-04-18
申请号：US63036
申请日：1998-04-21
申请人： Takafumi Terahara
发明人： Takafumi Terahara
IPC分类号： H03F3/08 , H04B10/07 , H04B10/2507 , H04B10/293 , H04B10/40 , H04B10/50 , H04B10/60 , H04B10/69 , H01S3/00 , H04B10/06
CPC分类号： H04B10/67 , H04B10/673
摘要： An optical receiver for suppressing a useless intensity modulation component having an optical to electrical converter for converting an optical main signal to an electrical signal, an identifying device for identifying the electrical signal converted in the optical to electrical converter, an optical amplifier for amplifying the optical main signal provided on a preceding stage of the optical to electrical converter, an electrical amplifier for amplifying the converted electrical signal for a main signal provided on a rear stage of the optical to electrical converter, and a capacitor coupled on the preceding stage of the electrical amplifier having a characteristic of a low cut-off frequency higher than a polarization scrambling frequency or a monitoring control signal frequency.
摘要翻译：一种用于抑制具有用于将光学主信号转换为电信号的光电转换器的无用强度调制部件的光接收器，用于识别在光电转换器中转换的电信号的识别装置，用于放大光电转换器的光放大器提供在光电转换器的前级的主信号，用于放大设置在光电转换器的后级上的主信号的转换电信号的电放大器，以及耦合在电 - 电转换器的前级上的电容器放大器具有高于偏振加扰频率或监视控制信号频率的低截止频率的特性。

59. 发明授权

US5841557A Method and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal light 失效
标题翻译：用于扰乱形成波分复用信号光的信号光的偏振的方法和装置
公开(公告)号：US5841557A
公开(公告)日：1998-11-24
申请号：US734605
申请日：1996-10-22
申请人： Kazue Otsuka , Hiroshi Onaka , Takafumi Terahara , Takao Naito
发明人： Kazue Otsuka , Hiroshi Onaka , Takafumi Terahara , Takao Naito
IPC分类号： H04J14/00 , G02B6/34 , H04B10/03 , H04B10/032 , H04B10/2537 , H04B10/2557 , H04B10/2563 , H04J14/02 , H04J14/04 , H04J14/06
CPC分类号： H04J14/02 , H04B10/2557 , H04B10/2563 , H04B10/532 , G02B6/2786 , H04J14/06
摘要： A method and apparatus for scrambling the polarization of signal lights combined into a wavelength division multiplexed signal light, to suppress non-linear optical effect and thereby improve transmission quality. For example, each signal light has a different polarization before being combined into a wavelength division multiplexed signal light. The polarization of the wavelength division multiplexed signal light can then be scrambled. Alternatively, the polarization of each signal light can be scrambled at a different scrambling frequency before being combined into the wavelength division multiplexed signal light.
摘要翻译：一种将信号光的偏振加扰成波分复用信号光的方法和装置，以抑制非线性光学效应，从而提高传输质量。例如，每个信号光在被组合成波分复用信号光之前具有不同的偏振。波分复用信号光的偏振可以被加扰。或者，每个信号光的偏振可以在被组合成波分复用信号光之前以不同的加扰频率被加扰。

60. 发明授权

US5729372A Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system 失效
公开(公告)号：US5729372A
公开(公告)日：1998-03-17
申请号：US712958
申请日：1996-09-12
申请人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
发明人： Takafumi Terahara , Terumi Chikama , Masuo Suyama , Takao Naito
IPC分类号： G02F1/35 , H01S3/10 , H04B1/16 , H04B10/2507 , H04B10/2563 , H04B10/29 , H04B10/291 , H04B10/516 , H04B10/61 , H04B10/04
CPC分类号： H04B10/2572 , H04B10/291 , H04B10/2912 , H04B10/2918 , H04B10/2939 , H04B1/163
摘要： The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.

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