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1. 发明授权

US06535677B1 Dispersion-managed optical fiber, method of manufacturing the same, optical communication system including the same and optical fiber preform therefor 有权
标题翻译：色散管理光纤，其制造方法，包括该光纤的光通信系统和光纤预制棒
公开(公告)号：US06535677B1
公开(公告)日：2003-03-18
申请号：US09668347
申请日：2000-09-25
申请人： Shigeru Tanaka , Masayuki Nishimura , Shinji Ishikawa , Eisuke Sasaoka , Takatoshi Kato
发明人： Shigeru Tanaka , Masayuki Nishimura , Shinji Ishikawa , Eisuke Sasaoka , Takatoshi Kato
IPC分类号： G02B602
CPC分类号： G02B6/02242 , C03B37/0253 , C03B37/027 , C03B37/02745 , C03B37/032 , C03B2201/31 , C03B2203/19 , C03B2203/22 , C03B2203/36 , C03B2205/06 , C03B2205/40 , C03B2205/72 , C03C25/1062 , C03C25/223 , G02B6/02247 , G02B6/02257 , G02B6/02271 , G02B6/03627 , G02B6/03633 , G02B6/03644 , G02B6/0365 , G02B6/03666 , G02B6/29377
摘要： The present invention relates to a dispersion-managed optical fiber which can be manufactured easily and has a structure which enables the easy connection thereof with other optical fiber and the like. The dispersion-managed optical fiber is a silica-based optical fiber ensuring its single mode at a predetermined wavelength within a signal wavelength band, in which first portions each having a positive chromatic dispersion and second portions each having a negative chromatic dispersion are arranged alternately and adjacent to each other. In the dispersion-managed optical fiber, the dopant concentration is made uniform in the longitudinal direction and, corresponding to the above-mentioned first and second portions, the refractive index of a glass layer not doped with GeO2 as a dopant is adjusted or the residual stresses in glass layers are changed.
摘要翻译：本发明涉及一种易于制造的色散管理光纤，并且具有能够容易地与其他光纤等连接的结构。色散管理光纤是一种二氧化硅基光纤，其确保在信号波长带内的预定波长的单模，其中每个具有正色散的第一部分和每个具有负色散的第二部分交替排列，相邻。在色散管理的光纤中，掺杂剂浓度在纵向上均匀，并且对应于上述第一和第二部分，调整未掺杂有GeO 2作为掺杂剂的玻璃层的折射率或残余物玻璃层的应力发生变化。

2. 发明授权

US06618532B1 Optical transmission line 有权
标题翻译：光传输线
公开(公告)号：US06618532B1
公开(公告)日：2003-09-09
申请号：US09628510
申请日：2000-11-27
申请人： Eisuke Sasaoka , Shigeru Tanaka , Masayuki Nishimura , Shinji Ishikawa , Takatoshi Kato
发明人： Eisuke Sasaoka , Shigeru Tanaka , Masayuki Nishimura , Shinji Ishikawa , Takatoshi Kato
IPC分类号： G02B602
CPC分类号： G02B6/02009 , C03B37/01205 , C03B37/027 , C03B2203/18 , C03B2203/36 , C03B2205/40 , C03B2205/47 , G02B6/02242 , G02B6/03627 , G02B6/03644 , G02B6/29377 , H04B10/25253
摘要： An optical transmission line having reduced flunctions in transmission quality is formed with a structure in which first and second waveguides whose transmission characteristics at a predetermined wavelength in a wavelength band in use are set opposite to each other and are arranged alternately. The chromatic dispersion of the first and second waveguides are set so as to have signs opposite to each other, and the dispersion slope of the first and second waveguides are set so as to have signs opposite to each other. Embodiments include setting the absolute value of chromatic dispersion in each first waveguide to 1 ps/nm/km or more but 10 ps/nm/km or less, and the absolute value of chromatic dispersion in each second waveguide is set to 1 ps/nm/km or more but 10 ps/nm/km or less.
摘要翻译：具有传输质量降低的光传输线路的形成是这样的结构，其中在使用中的波长带中的预定波长的传输特性彼此相对设置并交替布置的第一和第二波导。将第一和第二波导的色散设定为具有彼此相反的符号，并且将第一和第二波导的色散斜率设定为具有彼此相反的符号。实施例包括将每个第一波导中的色散的绝对值设置为1ps / nm / km或更大但10ps / nm / km或更小，并且将每个第二波导中的色散的绝对值设置为1ps / nm / km以上，10ps / nm / km以下。

3. 发明授权

US06498874B1 Optical transmission line 失效
标题翻译：光传输线
公开(公告)号：US06498874B1
公开(公告)日：2002-12-24
申请号：US09599265
申请日：2000-06-22
申请人： Takatoshi Kato , Eisuke Sasaoka , Masayuki Nishimura
发明人： Takatoshi Kato , Eisuke Sasaoka , Masayuki Nishimura
IPC分类号： G02B618
CPC分类号： G02B6/02009 , G02B6/02242 , G02B6/03644 , G02B6/03666 , G02B6/29377 , H04B10/2525
摘要： This invention relates to an optical transmission line having a structure that reduces dispersion with respect to signal light in a 1.55-&mgr;m band. Each transmission unit includes a dispersion-shifted optical fiber as a transmission medium and a mode removing unit for reducing the optical power of high-order modes excluding a fundamental mode of light signals propagating through the dispersion-shifted optical fiber. The dispersion-shifted optical fiber has an incident terminal on which the light signals are incident and an exit terminal from which the light signals are emitted, and has a cutoff wavelength longer than the wavelength of the light signals at a fiber length of 2 m. The mode removing unit has a structure for reducing the optical power of high-order modes to 1/10 or less, preferably 1/40 or less, of the optical power of the fundamental mode so as to satisfy the single-mode condition in relation to fiber length.
摘要翻译：本发明涉及一种光传输线路，其具有相对于1.55μm波段中的信号光减少色散的结构。每个发送单元包括作为传输介质的色散位移光纤和用于降低除通过色散位移光纤传播的基本模式的高阶模式的光功率的模式去除单元。色散位移光纤具有入射端子，光信号入射到入射端子，出射端子发光，并且具有比光纤长度为2μm的光信号的波长更长的截止波长。模式去除单元具有将高阶模式的光功率降低到基模的光功率的1/10以下，优选为1/40以下的结构，以满足关于单模状态的单模状态到纤维长度。

4. 发明授权

US06256440B1 Dispersion-shifted optical fiber 有权
标题翻译：色散位移光纤
公开(公告)号：US06256440B1
公开(公告)日：2001-07-03
申请号：US09586966
申请日：2000-06-05
申请人： Takatoshi Kato , Eisuke Sasaoka , Masayuki Nishimura
发明人： Takatoshi Kato , Eisuke Sasaoka , Masayuki Nishimura
IPC分类号： G02B616
CPC分类号： G02B6/02014 , G02B6/02238 , G02B6/02252 , G02B6/03611 , G02B6/03627 , G02B6/03633 , G02B6/03644
摘要： The present invention relates to a dispersion-shifted optical fiber suitable for an optical transmission line having an optical fiber amplifier with a wider amplification band. In particular, the dispersion-shifted optical fiber according to the present invention has a zero-dispersion wavelength of 1610 nm or more but 1750 nm or less, and a cutoff wavelength of 1.1 &mgr;m or more at a length of 2 m in order to suppress the bending loss to a practically permissible range, and has, with respect to light having a wavelength of 1550 nm, an effective area of 45 &mgr;m2 or more and a dispersion slope of 0.15 ps/nm2/km or less in order to suppress the occurrence of nonlinear phenomena.
摘要翻译：本发明涉及一种适用于具有宽放大频带的光纤放大器的光传输线的色散位移光纤。特别地，根据本发明的色散位移光纤具有1610nm以上但1750nm以下的零色散波长，在2μm的长度下的截止波长为1.1μm以上，以抑制弯曲损耗达到实际允许的范围，并且对于波长为1550nm的光，为了抑制发生，有效面积为45mum2以上，色散斜率为0.15ps / nm2 / km以下的非线性现象。

5. 发明授权

US06169837A Dispersion-flattened optical fiber 有权
标题翻译：色散扁平光纤
公开(公告)号：US06169837A
公开(公告)日：2001-01-02
申请号：US09341310
申请日：1999-07-08
申请人： Takatoshi Kato , Hitoshi Hatayama , Eisuke Sasaoka , Masayuki Nishimura
发明人： Takatoshi Kato , Hitoshi Hatayama , Eisuke Sasaoka , Masayuki Nishimura
IPC分类号： G02B602
CPC分类号： G02B6/02009 , G02B6/02233 , G02B6/02242 , G02B6/03611 , G02B6/03627 , G02B6/03644 , G02B6/03666
摘要： The present invention aims at providing a dispersion-flattened optical fiber which is suitable for wavelength-division multiplexing soliton transmission utilizing an optical amplifier and the like and has a structure for effectively restraining nonlinear optical phenomena from occurring. The dispersion-flattened optical fiber according to the present invention has, as characteristics at a wavelength of 1550 nm, a dispersion with an absolute value of 5 ps/nm/km or less, an effective cross-sectional area of 45 &mgr;n 2 or more, a dispersion slope of 0.03 ps/nm2/km or less, and a cutoff wavelength of 1.0 &mgr;m or more at a length of 2 m.
摘要翻译：本发明的目的在于提供一种适用于利用光放大器等进行波分复用孤子传输的色散平坦光纤，具有有效抑制非线性光学现象发生的结构。本发明的色散平坦化光纤作为1550nm波长的特性，具有绝对值为5ps / nm / km以下的色散，有效截面积为45mb 2以上，0.03ps / nm 2 / km以下的色散斜率，2μm长度的截止波长为1.0μm以上。

6. 发明授权

US06487353B2 Dispersion-shifted optical fiber 失效
标题翻译：色散位移光纤
公开(公告)号：US06487353B2
公开(公告)日：2002-11-26
申请号：US09850055
申请日：2001-05-08
申请人： Takatoshi Kato , Eisuke Sasaoka , Masayuki Nishimura
发明人： Takatoshi Kato , Eisuke Sasaoka , Masayuki Nishimura
IPC分类号： G02B602
CPC分类号： G02B6/02014 , G02B6/02238 , G02B6/02252 , G02B6/03611 , G02B6/03627 , G02B6/03633 , G02B6/03644
摘要： The present invention relates to a dispersion-shifted optical fiber suitable for an optical transmission line having an optical fiber amplifier with a wider amplification band. In particular, the dispersion-shifted optical fiber according to the present invention has a zero-dispersion wavelength of 1610 nm or more but 1750 nm or less, and a cutoff wavelength of 1.1 &mgr;m or more at a length of 2 m in order to suppress the bending loss to a practically permissible range, and has, with respect to light having a wavelength of 1550 nm, an effective area of 45 &mgr;m2 or more and a dispersion slope of 0.15 ps/nm2/km or less in order to suppress the occurrence of nonlinear phenomena.
摘要翻译：本发明涉及一种适用于具有宽放大频带的光纤放大器的光传输线的色散位移光纤。特别地，根据本发明的色散位移光纤具有1610nm以上但1750nm以下的零色散波长，在2μm的长度下的截止波长为1.1μm以上，以抑制弯曲损耗达到实际允许的范围，并且对于波长为1550nm的光，为了抑制发生，有效面积为45mum2以上，色散斜率为0.15ps / nm2 / km以下的非线性现象。

7. 发明授权

US06724525B2 Raman amplifying control unit and optical transmission system 失效
标题翻译：拉曼放大控制单元和光传输系统
公开(公告)号：US06724525B2
公开(公告)日：2004-04-20
申请号：US09788659
申请日：2001-02-21
申请人： Toshiaki Okuno , Eisuke Sasaoka , Masayuki Nishimura , Shigeru Tanaka
发明人： Toshiaki Okuno , Eisuke Sasaoka , Masayuki Nishimura , Shigeru Tanaka
IPC分类号： H01S300
CPC分类号： H01S3/302 , H01S3/0014 , H01S3/06754 , H01S3/1301 , H01S3/1305
摘要： Disclosed are an optical transmission system and a Raman amplifying control unit that can stabilize the effective loss of a transmission line even if the optical transmission system has a relay station between a transmitting station and a receiving station. The optical transmission system and the Raman amplifying control unit have an introducing means for outputting inspection light and introducing it to the transmission line, a receiving means for receiving the back-scatter from the inspection light, and a control means for inspecting the transmission line and controlling an exciting light supplying means according to the received backscattering light. The introducing means, the receiving means, and the control means are provided together with the exciting light supplying means in a station at the transmitting side or receiving side of a relay section in the optical transmission system.
摘要翻译：公开了一种光传输系统和拉曼放大控制单元，其即使光传输系统在发射站和接收站之间具有中继站，也可以稳定传输线的有效损耗。光传输系统和拉曼放大控制单元具有用于输出检查光并将其引入传输线的引入装置，用于从检查光接收反向散射的接收装置和用于检查传输线的控制装置和根据所接收的反向散射光控制激励光供给装置。引导装置，接收装置和控制装置与光传输系统中的中继部的发送侧或接收侧的站中的激励光供给装置一起设置。

8. 发明授权

US06782151B2 Raman amplifier, optical transmission system and optical fiber 失效
标题翻译：拉曼放大器，光传输系统和光纤
公开(公告)号：US06782151B2
公开(公告)日：2004-08-24
申请号：US09752526
申请日：2001-01-03
申请人： Eisuke Sasaoka , Masayuki Nishimura , Shigeru Tanaka
发明人： Eisuke Sasaoka , Masayuki Nishimura , Shigeru Tanaka
IPC分类号： G02B642
CPC分类号： G02B6/29377 , H01S3/094003 , H01S3/302 , H04B10/2525 , H04B10/2916 , H04B2210/003
摘要： A Raman amplifier having a great Raman amplification gain is disclosed. An optical transmission system 1 is provided with an optical fiber 31 for Raman amplification and an optical multiplexer 41 between a transmitter 10 and a receiver 20 in the order of enumeration, and further provided with a pump light source 51 for Raman amplification that is connected with the optical multiplexer 41. The wavelength of signal light to be transmitted from the transmitter 10 to the receiver 20 is at 1.65 &mgr;m band, and the wavelength of the pump light that is output from the light source 51 is C-band or L-band. Since the pump light for Raman amplification propagates at a low loss through the optical fiber for Raman amplification, a great Raman amplification gain can be attained by the Raman amplifier.
摘要翻译：公开了具有很大拉曼放大增益的拉曼放大器。光传输系统1按照枚举方式设置有用于拉曼放大的光纤31和发射机10和接收机20之间的光复用器41，并且还设置有用于拉曼放大的泵浦光源51，其与从发射机10发射到接收机20的信号光的波长为1.65mum的波段，从光源51输出的泵浦光的波长为C波段或L波段。由于拉曼放大的泵浦光通过用于拉曼放大的光纤以低损耗传播，所以通过拉曼放大器可以获得很大的拉曼放大增益。

9. 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。

10. 发明授权

US06704135B2 Operation mode switching apparatus, Raman amplifier and optical transmission system 有权
标题翻译：操作模式开关装置，拉曼放大器和光传输系统
公开(公告)号：US06704135B2
公开(公告)日：2004-03-09
申请号：US10007668
申请日：2001-12-10
申请人： Eisuke Sasaoka , Masayuki Nishimura
发明人： Eisuke Sasaoka , Masayuki Nishimura
IPC分类号： H01S300
CPC分类号： H01S3/302 , H01S3/1022
摘要： The present invention relates to an operation mode switching apparatus comprising a structure for making it possible to minimize the waste of energy caused by troubles occurring in optical fiber lines and the like in order to efficiently utilize the energy consumed in an optical transmission system aimed for a long-term operation; a Raman amplifier including the operation mode switching apparatus; and an optical transmission system including the Raman amplifier. If an optical fiber line acting as an optical transmission medium breaks in the optical transmission system, the signal power detected from the optical fiber decreases, whereby it changes to a set value or less or the amount of decrease in signal power per unit time changes by a set value or more. The operation mode switching apparatus comprises a control section for monitoring such a change in signal power, thereby switching the pumping light supply operation from a communication mode to a wait mode for minimizing the waste of pumping energy in response to the occurrence of troubles.
摘要翻译：本发明涉及一种操作模式切换装置，其包括一种结构，用于使由光纤线路等发生的故障所引起的能量的浪费最小化，从而有效地利用目的在于将光传输系统长期经营; 包括操作模式切换装置的拉曼放大器; 以及包括拉曼放大器的光传输系统。如果作为光传输介质的光纤线路在光传输系统中断裂，则从光纤检测到的信号功率减小，由此其变为设定值或更小或每单位时间的信号功率的减小量变化设定值以上。操作模式切换装置包括用于监视信号功率变化的控制部分，从而将泵送光供应操作从通信模式切换到等待模式，以便最小化响应于故障发生的泵送能量的浪费。

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