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1. 发明授权

US6061172A Active optical fiber and optical fiber amplifier 失效
标题翻译：有源光纤和光纤放大器
公开(公告)号：US6061172A
公开(公告)日：2000-05-09
申请号：US162144
申请日：1998-09-29
申请人： Takao Naito , Naomasa Shimojoh , Takafumi Terahara
发明人： Takao Naito , Naomasa Shimojoh , Takafumi Terahara
IPC分类号： G02B5/18 , G02B6/02 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/10 , H01S3/16 , H01S3/00
CPC分类号： H01S3/094003 , H01S3/0675 , H01S3/1608
摘要： The present invention aims at providing an active optical fiber and an optical fiber amplifier, in which a conversion efficiency of pumping light to be input into the active optical fiber is increased to thereby improve optical amplification characteristic. To this end, the active optical fiber of the present invention is formed with fiber gratings arranged over a predetermined region along the longitudinal direction within the optical fiber doped with a rare earth element, and transmitting signal light and reflecting pumping light. Further, the optical fiber amplifier of the present invention is constituted to comprise a pumping light source for generating pumping light, and a multiplexer for multiplexing signal light and the pumping light to thereby output them into one end of the active optical fiber. Thus, the pumping light is reflected by the fiber gratings so as to go and return within the active optical fiber, thereby improving the conversion efficiency of the pumping light.
摘要翻译：本发明的目的在于提供一种有源光纤和光纤放大器，其中增加输入有源光纤的泵浦光的转换效率，从而提高光放大特性。为此，本发明的有源光纤由掺杂有稀土元素的光纤内沿着长度方向的预定区域配置的光纤光栅形成，并且传输信号光并反射泵浦光。此外，本发明的光纤放大器构成为包括用于产生泵浦光的泵浦光源和用于复用信号光的多路复用器和泵浦光，从而将其输出到有源光纤的一端。因此，泵浦光被光纤光栅反射，从而在有源光纤内返回，从而提高了泵浦光的转换效率。

2. 发明授权

US06807376B2 Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier 失效
标题翻译：增益均衡器，其包括用于均衡光放大器的增益的多个滤光器
公开(公告)号：US06807376B2
公开(公告)日：2004-10-19
申请号：US09960403
申请日：2001-09-24
申请人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
发明人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
IPC分类号： H04B1012
CPC分类号： H04B10/2941 , H01S3/10023 , H01S3/1312 , H01S2301/04 , H04B10/2942 , H04J14/0221
摘要： A gain equalizer which equalizes gain versus wavelength characteristics of an optical amplifier. The gain versus wavelength characteristics of the optical amplifier include first, second and third gain peaks in a wavelength band with the second gain peak being between the first and third gain peaks. The optical amplifier amplifies an input signal in accordance with the gain versus wavelength characteristics to produce an output signal. The gain equalizer includes first, second and third optical filters having first, second and third transparency characteristics, respectively. The first, second and third transparency characteristics are periodic waveforms having different periods related to the wavelength difference between the first and third gain peaks. The second transparency characteristic is a periodic waveform having a period equal to 1/(2n) of the period of the waveform of the first transparency characteristic. The third transparency characteristic is a periodic waveform having a period equal to ¼ of the period of the waveform of the first transparency characteristic. For example, the first transparency characteristic is a periodic waveform with ¼ period extending between the first and third gain peaks, the second transparency characteristic is a periodic waveform with one period extending between the first and third gain peaks, and the third transparency characteristic is a periodic waveform with two periods extending between the first and third gain peaks.
摘要翻译：增益均衡器，其均衡光放大器的增益对波长特性。光放大器的增益对波长特性包括波长带中的第一，第二和第三增益峰值，第二增益峰值在第一和第三增益峰值之间。光放大器根据增益对波长特性来放大输入信号以产生输出信号。增益均衡器包括分别具有第一，第二和第三透明特性的第一，第二和第三滤光器。第一，第二和第三透明度特征是具有与第一和第三增益峰值之间的波长差有关的不同周期的周期性波形。第二透明度特性是周期等于第一透明特性的波形周期的1 /（2 ）的周期波形。第三透明特性是周期等于第一透明特性的波形周期的1/4的周期波形。例如，第一透明特性是在第一和第三增益峰之间延伸的1/4周期的周期波形，第二透明特性是周期性波形，其中一个周期在第一和第三增益峰之间延伸，第三透明特性是具有在第一和第三增益峰之间延伸的两个周期的周期性波形。

3. 发明授权

US06344914B1 Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier 失效
标题翻译：增益均衡器，其包括用于均衡光放大器的增益的多个滤光器
公开(公告)号：US06344914B1
公开(公告)日：2002-02-05
申请号：US08805825
申请日：1997-02-26
申请人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
发明人： Naomasa Shimojoh , Takafumi Terahara , Terumi Chikama
IPC分类号： H04B1002
CPC分类号： H04B10/2941 , H01S3/10023 , H01S3/1312 , H01S2301/04 , H04B10/2942 , H04J14/0221
摘要： A gain equalizer which equalizes gain versus wavelength characteristics of an optical amplifier. The gain versus wavelength characteristics of the optical amplifier include first, second and third gain peaks in a wavelength band with the second gain peak being between the first and third gain peaks. The optical amplifier amplifies an input signal in accordance with the gain versus wavelength characteristics to produce an output signal. The gain equalizer includes first, second and third optical filters having first, second and third transparency characteristics, respectively. The first, second and third transparency characteristics are periodic waveforms having different periods related to the wavelength difference between the first and third gain peaks. The second transparency characteristic is a periodic waveform having a period equal to 1/(2n) of the period of the waveform of the first transparency characteristic. The third transparency characteristic is a periodic waveform having a period equal to ¼ of the period of the waveform of the first transparency characteristic. For example, the first transparency characteristic is a periodic waveform with ¼ period extending between the first and third gain peaks, the second transparency characteristic is a periodic waveform with one period extending between the first and third gain peaks, and the third transparency characteristic is a periodic waveform with two periods extending between the first and third gain peaks.
摘要翻译：增益均衡器，其均衡光放大器的增益对波长特性。光放大器的增益对波长特性包括波长带中的第一，第二和第三增益峰值，第二增益峰值在第一和第三增益峰值之间。光放大器根据增益对波长特性来放大输入信号以产生输出信号。增益均衡器包括分别具有第一，第二和第三透明特性的第一，第二和第三滤光器。第一，第二和第三透明度特征是具有与第一和第三增益峰值之间的波长差有关的不同周期的周期性波形。第二透明特性是周期等于第一透明特性的波形的周期的1 /（2n）的周期波形。第三透明特性是周期等于第一透明特性的波形周期的1/4的周期波形。例如，第一透明特性是在第一和第三增益峰之间延伸的1/4周期的周期波形，第二透明特性是周期性波形，其中一个周期在第一和第三增益峰之间延伸，第三透明特性是具有在第一和第三增益峰之间延伸的两个周期的周期性波形。

4. 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。

5. 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.

6. 发明授权

US5539566A Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system 失效
标题翻译：光通信系统的光传输方法及装置及光放大方法及装置
公开(公告)号：US5539566A
公开(公告)日：1996-07-23
申请号：US425974
申请日：1995-04-20
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 , H04B10/17 , 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.
摘要翻译：本发明提供一种光传输方法和装置，适用于通过海洋长达几千公里的远距离通信的光通信系统的终端装置，以及适于与中继器用于光通信系统。该方法和装置的改进在于，抑制光放大器中的过度损耗和分支比的变化，以抑制增益的变化，以抑制光通信的传输线上的损耗或增益的极化依赖性系统。光传输装置包括用于输出去偏振光的去极化光源和用于调制来自去偏振光源的光的外部调制器。

7. 发明授权

US07936993B2 Chromatic dispersion compensating apparatus 失效
标题翻译：色散补偿装置
公开(公告)号：US07936993B2
公开(公告)日：2011-05-03
申请号：US12654752
申请日：2009-12-30
申请人： Hiroki Ooi , Takashi Iwabuchi , Takafumi Terahara , Junichi Kumasako , George Ishikawa , Tomoo Takahara
发明人： Hiroki Ooi , Takashi Iwabuchi , Takafumi Terahara , Junichi Kumasako , George Ishikawa , Tomoo Takahara
IPC分类号： H04J14/02
CPC分类号： H04B10/25133 , H04B2210/258
摘要： In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central wavelength of each of the bands zero.
摘要翻译：为了补偿在光信号的整个波长带上的色散和色散斜率，波长带被分成多个频带，并且进行色散补偿以使得每个频带的中心波长的色散零。

8. 发明授权

US07873283B2 Method of monitoring optical signal to noise ratio and optical transmission system using the same 有权
标题翻译：监测光信噪比的方法及使用其的光传输系统
公开(公告)号：US07873283B2
公开(公告)日：2011-01-18
申请号：US10662394
申请日：2003-09-16
申请人： Yuichi Akiyama , Takafumi Terahara
发明人： Yuichi Akiyama , Takafumi Terahara
IPC分类号： G01J3/28 , H04B10/08
CPC分类号： H04B10/077 , H04B10/07955
摘要： The invention aims to provide a monitoring method that can measure an optical SNR in an ultra high speed optical transmission system with high accuracy, and an optical transmission system using the same. To this end, in the optical transmission system to which the monitoring method of the present invention is applied, the degree of polarization of an optical signal transmitted from an optical transmission apparatus to an optical receiving apparatus via an optical transmission path is measured by a DOP measuring device, and an optical SNR of the optical signal is determined by an optical SNR calculation circuit based on a measured value of the degree of polarization.
摘要翻译：本发明旨在提供一种能够高精度地测量超高速光传输系统中的光学SNR的监视方法，以及使用该方法的光传输系统。为此，在应用本发明的监视方法的光传输系统中，通过DOP测量从光传输装置发送到光接收装置的光信号的偏振度测量装置和光信号的光学SNR由光学SNR计算电路基于偏振度的测量值确定。

9. 发明授权

US07796887B2 Wavelength division multiplexing optical transmission system, and wavelength division multiplexing optical transmission method 有权
标题翻译：波分复用光传输系统和波分复用光传输方法
公开(公告)号：US07796887B2
公开(公告)日：2010-09-14
申请号：US10606935
申请日：2003-06-27
申请人： Takafumi Terahara , Kentaro Nakamura
发明人： Takafumi Terahara , Kentaro Nakamura
IPC分类号： H04J14/00 , H04B10/08
CPC分类号： H04J14/02
摘要： The invention aims to provide an optical transmission system that specifies such a transmission condition so as to obtain high spectrum efficiency and a large transmission distance-capacity product at the same time, and uses low cost and small sized optical senders and optical receivers, to realize a high density wavelength multiplexing optical transmission. For this purpose, a WDM optical transmission system of the invention has a system structure that specifies by calculation the spectrum efficiency at which transmission distance-capacity product becomes a maximum value based on the determination of the type of signal light modulation and the assumption of an equation model expressing transmission characteristics of an optical multiplexer and an optical demultiplexer, and optimizes a bit rate and frequency spacing of signal light output from each optical sender, and the transmission characteristics of the optical multiplexer and the optical demultiplexer, so as to approach the spectrum efficiency.
摘要翻译：本发明旨在提供一种光传输系统，其规定了这样的传输条件，以便同时获得高频率效率和大的传输距离容量产品，并且使用低成本和小尺寸的光发送器和光接收机来实现高密度波长复用光传输。为此，本发明的WDM光传输系统具有系统结构，该系统结构根据信号光调制类型的确定，通过计算确定传输距离容量乘积成为最大值的频谱效率，表示光复用器和光解复用器的传输特性的方程模型，并且优化从每个光发送器输出的信号光的比特率和频率间隔以及光复用器和光解复用器的传输特性，以便接近频谱效率。

10. 发明授权

US07720383B2 Optical transmission apparatus having OADM function 有权
标题翻译：具有OADM功能的光传输设备
公开(公告)号：US07720383B2
公开(公告)日：2010-05-18
申请号：US11651599
申请日：2007-01-10
申请人： Yuichi Akiyama , Takafumi Terahara , Hiroki Ooi
发明人： Yuichi Akiyama , Takafumi Terahara , Hiroki Ooi
IPC分类号： H04J14/02
CPC分类号： H04Q11/0005 , H04J14/0204 , H04J14/0205 , H04J14/0209 , H04J14/0212 , H04J14/0213 , H04J14/0216 , H04J14/0217 , H04J14/0219 , H04Q2011/0035 , H04Q2011/006
摘要： An optical transmission apparatus has a first wavelength selective switch (WSS) for route switching, provided with respect to each route, to selectively output signal light from a first input route to second through Nth output routes and to selectively output signal lights from second through Nth input routes to a first output route, for every wavelength, a second WSS for add and drop, to selectively output a signal light from an add port to the first through Nth output routes via the first WSS for every wavelength, and to selectively output the signal lights from the first through Nth input routes to a drop port via the first WSS for every wavelength, and an optical coupler to multiplex each of the signal lights output from the first WSS to the output routes and each of the signal lights output from the second WSS to the output routes, for every route, and to send multiplexed signal light to a first WSS of an other route, and to branch and supply multiplexed signal light input from said other route to the first WSS and the second WSS. The signal lights input and output by the first WSS and the second WSS are transmitted bidirectionally within a single optical transmission line.
摘要翻译：光传输装置具有用于路由切换的第一波长选择开关（WSS），其针对每条路线，选择性地将来自第一输入路径的信号光输出到第二至第N输出路径，并选择性地从第二至第N输出信号光输入到第一输出路线的路由，对于每个波长，第二个用于加和减的WSS，用于经由第一WSS为每个波长选择性地输出来自加法端口的信号光到第一至第N输出路由，并选择性地输出从第一至第N输入的信号灯经由用于每个波长的第一WSS到达分接口，以及光耦合器，用于将从第一WSS输出的每个信号光复用到输出路径，并且每个信号光从对于每个路由，将第二WSS发送到输出路由，并将多路复用的信号光发送到另一路由的第一WSS，并分支和提供从sa输入的复用信号光 id到第一个WSS和第二个WSS的其他路由。由第一WSS和第二WSS输入和输出的信号灯在单个光传输线内双向传输。

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