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1. 发明授权

US06480328B2 Optical amplifier and optical amplification method for amplifying wavelength division multiplexed signal light 失效
标题翻译：用于放大波分复用信号光的光放大器和光放大方法
公开(公告)号：US06480328B2
公开(公告)日：2002-11-12
申请号：US09727448
申请日：2000-12-04
申请人： Naomasa Shimojoh
发明人： Naomasa Shimojoh
IPC分类号： H01S3091
CPC分类号： H04B10/2942 , H04B10/2971 , H04B2210/258
摘要： An object of the invention is to provide, for an optical amplifier which performs amplification of optical signals of two wavelength bands, an optical amplifier and an optical amplification method of a simple configuration which can deal with restrictions on installation space, power consumption and the like. Hence with the optical amplifier of the invention, optical circulators are respectively connected to opposite ends of an optical amplifying means, and optical signals of the respective wavelength bands of a first wavelength band and a second wavelength band are input and output to the optical amplifying means via each of the optical circulators so that the propagation directions of the respective optical signals of the respective wavelength bands are in mutually opposite directions inside a rare earth element doped fiber. As a result, the optical signals of the respective wavelength bands can be collectively amplified with a simple configuration using a single rare earth element doped fiber.
摘要翻译：本发明的目的是为了实现对两个波长带的光信号进行放大的光放大器，提供一种可以处理对安装空间，功耗等的限制的简单配置的光放大器和光放大方法。因此，利用本发明的光放大器，光循环器分别连接到光放大装置的相对端，并且将第一波长带和第二波段的各波长带的光信号输入并输出到光放大装置通过每个光循环器，使得各个波长带的各个光信号的传播方向在稀土元素掺杂光纤内相互相反的方向。结果，可以使用单个稀土元素掺杂光纤以简单的配置将各个波长带的光信号集中地放大。

2. 发明授权

US06417960B1 Method of equalizing gain utilizing asymmetrical loss-wavelength characteristics and optical amplifying apparatus using same 失效
标题翻译：利用不对称损耗波长特性均衡增益的方法和使用其的光放大装置
公开(公告)号：US06417960B1
公开(公告)日：2002-07-09
申请号：US09576419
申请日：2000-05-22
申请人： Naomasa Shimojoh
发明人： Naomasa Shimojoh
IPC分类号： H04B1012
CPC分类号： H04B10/2941 , H01S2301/04
摘要： A device for equalizing the gain-wavelength characteristics of an optical repeater used in a long distance optical transmission system, wherein the gain-wavelength characteristics are equalized by one optical filter having asymmetrical loss-wavelength characteristics in a desired wavelength range order to flatten the gain-wavelength characteristics curve over a wide wavelength range. Since such a device can equalize the gain by one optical filter, adjustment the would normally be required between plural optical filters is unnecessary, so that it is simple and cost effective.
摘要翻译：一种用于均衡在长距离光传输系统中使用的光中继器的增益波长特性的装置，其中增益波长特性由具有所需波长范围的不对称损耗波长特性的一个滤光器均衡，以使增益平坦化波长特性曲线在宽波长范围内。由于这样的器件可以通过一个滤光器来均衡增益，所以不需要在多个滤光器之间进行调整，因此它是简单和成本有效的。

3. 发明授权

US06268955B1 Optical amplifier and wave length division multiplexed light transmission system 有权
标题翻译：光放大器和波长分割复用光传输系统
公开(公告)号：US06268955B1
公开(公告)日：2001-07-31
申请号：US09330610
申请日：1999-06-11
申请人： Naomasa Shimojoh , Takao Naito
发明人： Naomasa Shimojoh , Takao Naito
IPC分类号： H01S300
CPC分类号： H04B10/2941 , H01S3/06754
摘要： An object is to provide a low cost optical amplifier having a simple construction where gain equalization of wavelength division multiplexed signal light, and the suppression of noise light is realized by a single optical device, and to provide a wavelength division multiplexed light transmission system using such an amplifier. Accordingly, the optical amplifier of the present invention is constructed by providing for a conventional optical amplifier incorporating an EDF, an excitation light source and a multiplexer, an optical filter having a periodic loss-wavelength characteristic with respect to a gain wavelength characteristic of the EDF. The optical filter has the characteristic that a spacing (FSR) corresponding to one period of a loss-wavelength characteristic corresponds to a gain peak wavelength difference of the EDF, and a maximum loss wavelength approximately coincides with a gain peak wavelength on a long wavelength side of the EDF. With such an optical filter, gain equalization of the signal light positioned in the gain peak wavelength neighborhood on the long wavelength side can be effected, and noise light generated in the gain peak wavelength neighborhood on the short wavelength side can be suppressed.
摘要翻译：本发明的目的是提供一种具有简单结构的低成本光放大器，其中波分复用信号光的增益均衡和噪声光的抑制由单个光学器件实现，并且提供使用这样的波分复用光传输系统一个放大器因此，本发明的光放大器是通过提供包含EDF，激发光源和多路复用器的常规光放大器，相对于EDF的增益波长特性具有周期损耗波长特性的滤光器。滤光器的特征在于，对应于损耗波长特性的一个周期的间隔（FSR）对应于EDF的增益峰值波长差，并且最大损耗波长大致与长波长侧的增益峰值波长一致的EDF。利用这种滤光器，可以实现位于长波长侧的增益峰值波长附近的信号光的增益均衡，并且可以抑制在短波长侧的增益峰值波长附近产生的噪声光。

4. 发明授权

US06882466B1 Optical amplifier 失效
标题翻译：光放大器
公开(公告)号：US06882466B1
公开(公告)日：2005-04-19
申请号：US09634912
申请日：2000-08-09
申请人： Naomasa Shimojoh , Takao Naito
发明人： Naomasa Shimojoh , Takao Naito
IPC分类号： H01S3/10 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/16 , H01S3/23 , H01S3/30 , H04B10/07 , H04B10/2525 , H04B10/29 , H04B10/296 , H04J14/00 , H04J14/02 , H01S3/00
CPC分类号： H04B10/2931 , H01S3/06758 , H01S3/094042 , H01S3/1608 , H01S3/2375 , H01S3/2383 , H01S3/302 , H04B10/2916 , H04B2210/258
摘要： An optical amplifier is provided for performing amplification of optical signals of two wavelength bands, where deterioration in the optical SN ratio relative to one wavelength band is reduced, with a simple construction which can deal with restrictions on installation space, power consumption and the like. To this end, the present optical amplifier has a C/L band optical amplifying section for amplifying respective optical signals of a C band and an L band, a demultiplexer for demultiplexing output light from the C/L band optical amplifying section into the C band and the L band, an L band optical amplifying section for amplifying L band optical signals which have been demultiplexed by the demultiplexer, and a multiplexer for multiplexing the C band optical signals which have been demultiplexed by the demultiplexer and the L band optical signals which have been amplified by the L band optical amplifying section. The construction is such that a part of excitation light of a 1480 nm band used in the C/L band optical amplifying section is supplied via an input terminal to a Raman amplification producing medium of a transmission path, and Raman amplified L band optical signals are input to the C/L band optical amplifying section.
摘要翻译：提供一种光放大器，用于执行两个波长带的光信号的放大，其中相对于一个波长带的光SN比的劣化被减少，具有可以解决对安装空间，功耗等的限制的简单结构。为此，本光放大器具有用于放大C波段和L波段的各个光信号的C / L波段光放大部分，用于将来自C / L波段光放大部分的输出光解复用为C波段的解复用器 L波段，用于放大由解复用器解复用的L波段光信号的L波段光放大部分，以及多路复用器，用于多路复用已由解复用器解复用的C波段光信号和L波段光信号，被L波段光放大部分放大。该结构使得在C / L频带光放大部分中使用的1480nm波段的激发光的一部分经由输入端子被提供给传输路径的拉曼放大产生介质，并且拉曼放大的L波段光信号是输入到C / L频带光放大部分。

5. 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。

6. 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。

7. 发明授权

US06930823B2 Optical transmission method and optical transmission system utilizing Raman amplification 有权
标题翻译：光传输方法和利用拉曼放大的光传输系统
公开(公告)号：US06930823B2
公开(公告)日：2005-08-16
申请号：US10022543
申请日：2001-12-20
申请人： Hiroshi Nakamoto , Takao Naito , Naomasa Shimojoh , Toshiki Tanaka
发明人： Hiroshi Nakamoto , Takao Naito , Naomasa Shimojoh , Toshiki Tanaka
IPC分类号： G02F1/35 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/102 , H01S3/131 , H01S3/16 , H01S3/30 , H04B10/07 , H04B10/077 , H04B10/29 , H04B10/291 , H01S3/00 , H04B10/08
CPC分类号： H04B10/2916 , H01S3/06754 , H01S3/094096 , H01S3/1301 , H01S3/1608 , H01S3/302 , H04B10/0775 , H04B2210/074
摘要： The present invention has an object to provide an optical transmission technology using Raman amplification wherein a supervisory signal transferred among a plurality of optical transmission apparatuses is superimposed on a main signal light by using a pumping light for Raman amplification. To this end, a Raman amplifier applied with the optical transmission method of the present invention, is provided with a supervisory signal superimposing section for superimposing a supervisory signal transferred among the optical transmission apparatuses on at least one of a plurality of pumping lights of different wavelengths to be supplied to a Raman amplification medium via a multiplexer from a pumping light generating section, thereby transmitting the main signal light propagated through the Raman amplification medium to be Raman amplified, which is superimposed with the supervisory signal.
摘要翻译：本发明的目的是提供一种使用拉曼放大的光传输技术，其中通过使用用于拉曼放大的泵浦光将多个光传输装置之间传输的监视信号叠加在主信号光上。为此，应用本发明的光传输方法的拉曼放大器设置有监视信号叠加部分，用于将在光传输装置之间传送的监控信号叠加在不同波长的多个泵浦光中的至少一个上通过来自泵浦光产生部分的多路复用器提供给拉曼放大介质，从而将通过拉曼放大介质传播的主信号光传输为与监控信号叠加的拉曼放大。

8. 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。

9. 发明授权

US06606188B2 Optical repeater using raman amplification, wavelength division multiplexed light transmission system, excitation light supply method and excitation light control method for raman amplification 有权
公开(公告)号：US06606188B2
公开(公告)日：2003-08-12
申请号：US09963467
申请日：2001-09-27
申请人： Naomasa Shimojoh
发明人： Naomasa Shimojoh
IPC分类号： H01S300
CPC分类号： H04B10/2931 , H04B10/2916 , H04B10/2918
摘要： The present invention is aimed at providing an optical repeater using Raman amplification that can Raman amplify WDM signal lights propagated through a plurality of transmission systems, with high excitation efficiency and stability. To this end, an optical repeater using Raman amplification of the present invention multiplexes and demultiplexes excitation lights supplied from a plurality of excitation light sources in a star coupler and then supplies the resultant demultiplexed lights to Raman amplification media of a plurality of transmission systems via optical multiplexers, to thereby Raman amplify the WDM signal lights of the respective transmission systems. Moreover, by feedback controlling the power of each excitation light based on the result of monitoring the WDM signal light power after Raman amplification in each transmission system, a stabilized Raman amplification operation with reduced dispersion in the power of each excitation light output from the star coupler is realized.

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