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1. 发明授权

US07076140B2 Optical fiber, dispersion compensator, optical transmission line and optical communications system 有权
标题翻译：光纤，色散补偿器，光传输线和光通信系统
公开(公告)号：US07076140B2
公开(公告)日：2006-07-11
申请号：US10717202
申请日：2003-11-20
申请人： Yoshinori Yamamoto , Takashi Fujii , Takatoshi Kato , Eisuke Sasaoka
发明人： Yoshinori Yamamoto , Takashi Fujii , Takatoshi Kato , Eisuke Sasaoka
IPC分类号： G02B6/02
CPC分类号： G02B6/03666 , G02B6/02261 , G02B6/03644 , G02B6/278 , G02B6/29377 , H04B10/2525
摘要： The present invention relates to an optical fiber or the like which allows more precise compensation for the chromatic dispersion of a transmission optical fiber over a broad wavelength band. The optical fiber has a chromatic dispersion of −100 ps/nm/km or less in a wavelength band of 1535 to 1565 nm, 1565 to 1610 nm, 1554 to 1608 nm or 1535 to 1610 nm. In particular, the chromatic dispersion profile of the fundamental mode of this optical fiber defined by the orthogonal coordinate system of the wavelength and chromatic dispersion value has a shape such that, over the entire wavelength band except for the shortest and longest wavelengths thereof, the chromatic dispersion values on the chromatic dispersion profile are respectively located on the minus side of the associated chromatic dispersion values on a straight line connecting the chromatic dispersion values at the shortest and longest wavelength. Since the chromatic dispersion profile of the transmission optical fiber such as a conventional single-mode fiber or the like has a shape opposite to that of this optical fiber, the chromatic dispersion of the transmission optical fiber can be compensated for more precisely by using this optical fiber as a dispersion compensating optical fiber.
摘要翻译：光纤等技术领域本发明涉及能够对宽波段的传输光纤的色散进行更精确的补偿的光纤等。在1535〜1565nm，1565〜1610nm，1554〜1608nm或1535〜1610nm的波长带中，光纤的色散为-100ps / nm / km以下。特别地，由波长和色散值的正交坐标系定义的该光纤的基本模式的色散曲线具有这样的形状，使得除了其最短和最长波长之外的整个波长带上，色度色散曲线上的色散值分别位于连接最短和最长波长的色散值的直线上相关联的色散值的负侧。由于诸如常规单模光纤等的传输光纤的色散曲线具有与该光纤相反的形状，所以可以通过使用该光学器件更精确地补偿传输光纤的色散光纤作为色散补偿光纤。

2. 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。

3. 发明授权

US6157754A Optical transmission line 失效
标题翻译：光传输线
公开(公告)号：US6157754A
公开(公告)日：2000-12-05
申请号：US75324
申请日：1998-05-11
申请人： Eisuke Sasaoka , Takatoshi Kato
发明人： Eisuke Sasaoka , Takatoshi Kato
IPC分类号： G02B6/00 , G02B6/02 , H04B10/25 , H04B10/2525 , G02B6/28
CPC分类号： H04B10/25253
摘要： The present invention relates to an optical transmission line, applicable to Wave Division Multiplexing (WDM) transmission, having a structure for restraining optical transmission characteristics from deteriorating due to each of the occurrence of nonlinear optical phenomena and the wavelength dispersion. This optical transmission line comprises, at least, a first optical fiber having, as characteristics at the predetermined operating wavelength, a first effective area and a first dispersion slope; and a second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than the first effective area and a second dispersion slope smaller than the first dispersion slope. In particular, the second optical fiber contributes to suppressing the deterioration in its optical transmission characteristics in the whole optical transmission line.
摘要翻译：本发明涉及一种适用于波分多路复用（WDM）传输的光传输线路，具有抑制由于非线性光学现象和波长色散引起的光传输特性劣化的结构。该光传输线至少包括作为在预定工作波长处的特性的第一有效区域和第一色散斜率的第一光纤; 以及第二光纤，其具有作为所述预定工作波长的特性的小于所述第一有效面积的第二有效面积和小于所述第一色散斜率的第二色散斜率。特别地，第二光纤有助于抑制整个光传输线路中的光传输特性的劣化。

4. 发明授权

US06532331B1 Single-mode optical fiber floor long haul transmission 失效
标题翻译：单模光纤地板长途传输
公开(公告)号：US06532331B1
公开(公告)日：2003-03-11
申请号：US09698105
申请日：2000-10-30
申请人： Takatoshi Kato , Masashi Onishi , Eisuke Sasaoka
发明人： Takatoshi Kato , Masashi Onishi , Eisuke Sasaoka
IPC分类号： G02B602
CPC分类号： G02B6/03644 , G02B6/02014 , G02B6/02271 , G02B6/0283 , G02B6/03611 , G02B6/03627
摘要： The present invention relates to an optical fiber comprising a structure which effectively suppresses the occurrence of nonlinear phenomena without increasing transmission loss such as macrobending loss. The optical fiber according to the present invention comprises, radially in succession from the center axis thereof, a center region having a predetermined refractive index, a first annular region having a higher refractive index than the center region, and a second annular region doped with fluorine and having a lower refractive index than the first annular region. In particular, this optical fiber has an effective area of 70 &mgr;m2 or more with respect to light having a wavelength of 1550 nm, whereas the fluorine contents in the second annular region is adjusted such that the refractive index thereof decreases with distance from the center of the optical fiber.
摘要翻译：本发明涉及一种光纤，其包括有效抑制非线性现象的发生而不增加诸如宏弯损耗的传输损耗的结构。根据本发明的光纤从其中心轴径向连续地包括具有预定折射率的中心区域，具有比中心区域更高的折射率的第一环形区域和掺杂有氟的第二环形区域并且具有比第一环形区域更低的折射率。特别地，该光纤相对于波长为1550nm的光具有70mum2以上的有效面积，而第二环状区域中的氟含量被调整为使得其折射率随着距离光纤。

5. 发明授权

US06266467B1 Optical fiber and optical transmission system including the same 有权
标题翻译：光纤和光传输系统包括相同的
公开(公告)号：US06266467B1
公开(公告)日：2001-07-24
申请号：US09580483
申请日：2000-05-30
申请人： Takatoshi Kato , Eisuke Sasaoka , Shigeru Tanaka
发明人： Takatoshi Kato , Eisuke Sasaoka , Shigeru Tanaka
IPC分类号： G02B616
CPC分类号： G02B6/036 , G02B6/02019 , G02B6/02223 , G02B6/02242 , G02B6/02271 , G02B6/0281 , G02B6/03611 , G02B6/03627 , G02B6/03633 , G02B6/03644 , G02B6/0365 , G02B6/03666
摘要： The present invention relates to an optical fiber which enables favorable optical communications in 1.3-&mgr;m and 1.55-&mgr;m wavelength bands, and an optical transmission system including the same. The optical fiber according to the present invention has only one zero-dispersion wavelength within a wavelength range of 1.20 &mgr;m to 1.60 &mgr;m, the zero-dispersion wavelength existing within a wavelength range of 1.37 &mgr;m to 1.50 &mgr;m, and has a positive dispersion slope at the zero-dispersion wavelength, thereby enabling favorable optical communications utilizing each signal light in the 1.3- &mgr;m and 1.55- &mgr;m wavelength bands sandwiching the zero-dispersion wavelength.
摘要翻译：本发明涉及能够在1.3μm和1.55μm波长带中实现良好的光通信的光纤，以及包括该光纤的光传输系统。根据本发明的光纤在1.20μm至1.60μm的波长范围内仅具有一个零色散波长，零色散波长存在于1.37μm至1.50μm的波长范围内，并且具有正色散斜率零色散波长，从而实现利用夹着零色散波长的1.3μm和1.55μm波长带中的每个信号光的有利的光通信。

6. 发明授权

US06229946B1 Dispersion-shifted optical fiber 失效
标题翻译：色散位移光纤
公开(公告)号：US06229946B1
公开(公告)日：2001-05-08
申请号：US09541912
申请日：2000-04-03
申请人： Eisuke Sasaoka , Takatoshi Kato
发明人： Eisuke Sasaoka , Takatoshi Kato
IPC分类号： G02B602
CPC分类号： G02B6/03644 , G02B6/02014 , G02B6/02219 , G02B6/02276 , G02B6/03611 , G02B6/03627 , G02B6/03633
摘要： The present invention relates to a dispersion-shifted optical fiber comprising a structure for reducing optical loss and restraining nonlinear phenomena from occurring. In order to restrain the nonlinear phenomena from occurring, this dispersion-shifted optical fiber has an effective area of 70 &mgr;m2 or more with respect to light whose center wavelength falls within the range of 1500 to 1600 nm, and the peak position where optical power of the light in a fundamental mode is maximized is radially shifted from a center of a core region by a predetermined distance. Also, in this dispersion-shifted optical fiber, optical power at a position radially separated from the peak position by a distance which is five times the center wavelength of the light becomes {fraction (1/100)} or less of the optical power at the peak position. As a consequence of this structure, bending loss can effectively be reduced.
摘要翻译：本发明涉及一种色散位移光纤，包括用于减少光损耗并抑制非线性现象的结构。为了抑制非线性现象的发生，该色散位移光纤相对于中心波长在1500〜1600nm的范围内的光的有效面积为70mum2以上，光功率的峰值位置基本模式的光最大化从芯区域的中心径向偏移预定距离。此外，在这种色散位移光纤中，与峰值位置放射性分离距离为光的中心波长的五倍的位置处的光功率为{分数（1/100）}以下的光功率的{分数（1/100）}以下峰值位置。作为这种结构的结果，可以有效地减少弯曲损耗。

7. 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。

8. 发明授权

US6072929A Dispersion-shifted fiber 失效
标题翻译：色散位移光纤
公开(公告)号：US6072929A
公开(公告)日：2000-06-06
申请号：US998425
申请日：1997-12-24
申请人： Takatoshi Kato , Eisuke Sasaoka , Shinji Ishikawa
发明人： Takatoshi Kato , Eisuke Sasaoka , Shinji Ishikawa
IPC分类号： C03B37/014 , G02B6/02
CPC分类号： G02B6/02014 , C03B37/01446 , C03B37/01466 , G02B6/02238 , G02B6/02271 , G02B6/0228 , G02B6/0365 , G02B6/03666 , C03B2201/12 , C03B2201/31 , C03B2203/22 , C03B2203/36
摘要： The present invention aims to provide a dispersion-shifted fiber which can effectively restrain nonlinear optical effects from occurring and has a configuration suitable for long-haul light transmission. The dispersion-shifted fiber has, as various characteristics at a wavelength of 1,550 nm, a dispersion level of 1.0 to 4.5 ps/nm/km in terms of absolute value, a dispersion slope not greater than 0.13 ps/nm.sup.2 /km in terms of absolute value, an effective core cross-sectional area not less than 70 .mu.m.sup.2, and a transmission loss not greater than 0.25 dB/km with respect to light in a 1.55-.mu.m wavelength band.
摘要翻译：本发明的目的在于提供一种可以有效地抑制非线性光学效应发生并具有适于长距离透光的结构的色散位移光纤。色散位移光纤作为波长为1,550nm的各种特性具有以绝对值表示的1.0至4.5ps / nm / km的色散水平，不大于0.13ps / nm 2 / km的色散斜率相对于1.55μm波段的光，绝对值，有效芯截面积不小于70μm2，传输损耗不大于0.25dB / km。

9. 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。

10. 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。

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