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    • 1. 发明授权
    • Raman amplifying control unit and optical transmission system
    • 拉曼放大控制单元和光传输系统
    • US06724525B2
    • 2004-04-20
    • US09788659
    • 2001-02-21
    • Toshiaki OkunoEisuke SasaokaMasayuki NishimuraShigeru Tanaka
    • Toshiaki OkunoEisuke SasaokaMasayuki NishimuraShigeru Tanaka
    • H01S300
    • H01S3/302H01S3/0014H01S3/06754H01S3/1301H01S3/1305
    • 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.
    • 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。
    • 2. 发明授权
    • Dispersion-compensating module
    • 色散补偿模块
    • US06853766B2
    • 2005-02-08
    • US10218491
    • 2002-08-15
    • Masao TsukitaniEisuke SasaokaToshiaki OkunoShigeru Tanaka
    • Masao TsukitaniEisuke SasaokaToshiaki OkunoShigeru Tanaka
    • G02B6/255G02B6/34G02B6/26
    • G02B6/29394G02B6/2551
    • The present invention relates to a dispersion-compensating module having a structure which compensates for the dispersion of an optical transmission line in a wavelength band of 1.55 μm and adjusts loss fluctuations among wavelengths in the wavelength band of 1.55 μm into an appropriate range. The module comprises a structure adapted to be installed in an already installed optical fiber transmission line, and has a loss slope with a polarity opposite to that of the optical fiber transmission line in the wavelength band of 1.55 μm. An example of the module comprises a dispersion-compensating optical fiber as a dispersion-compensating device, and an optical fiber doped with a transition metal element as a loss-equalizing device. Consequently, the loss fluctuations among individual wavelengths in the whole transmission line including the dispersion-compensating module are adjusted by the loss-equalizing device in the dispersion-compensating module so as to fall within an appropriate range.
    • 本发明涉及一种具有补偿光传输线在1.55μm波段的色散的结构的色散补偿模块,并且将波长为1.55μm的波长之间的损耗波动调整到适当的范围内。 该模块包括适于安装在已经安装的光纤传输线中的结构,并且具有与1.55μm波长带中的光纤传输线的极性相反的损耗斜率。 该模块的一个例子包括作为色散补偿装置的色散补偿光纤,以及掺杂过渡金属元素作为损耗均衡装置的光纤。 因此,通过色散补偿模块中的损耗均衡装置来调整包括色散补偿模块在内的整个传输线中的各个波长之间的损耗波动,使其落入适当的范围内。
    • 3. 发明授权
    • Dispersion-compensating module
    • 色散补偿模块
    • US06404950B1
    • 2002-06-11
    • US09452103
    • 1999-12-02
    • Masao TsukitaniEisuke SasaokaToshiaki OkunoShigeru Tanaka
    • Masao TsukitaniEisuke SasaokaToshiaki OkunoShigeru Tanaka
    • G02B626
    • G02B6/29377G02B6/2551G02B6/29317G02B6/29394
    • The present invention relates to a dispersion-compensating module having a structure which compensates for the dispersion of an optical transmission line in a 1.55-&mgr;m wavelength band and adjusts loss fluctuations among signal wavelengths in the 1.55-&mgr;m wavelength band into an appropriate range. The dispersion-compensating module comprises a structure adapted to be installed in an already installed optical fiber transmission line, and has a loss slope with a polarity opposite to that of the optical fiber transmission line in the 1.55-&mgr;m wavelength band. One application of the dispersion-compensating module comprises a dispersion-compensating optical fiber as a dispersion-compensating device, and an optical fiber doped with a transition metal element as a loss-equalizing device. By the above configuration, the loss fluctuations among individual signal wavelengths in the whole transmission line including the dispersion-compensating module can be adjusted by the loss-equalizing device in the dispersion-compensating module so as to fail within an appropriate range.
    • 本发明涉及一种具有补偿光传输线在1.55μm波长带中的色散的结构的色散补偿模块,并将1.55μm波长带中的信号波长之间的损耗波动调整到适当的范围内。 色散补偿模块包括适于安装在已经安装的光纤传输线中的结构,并且在1.55μm波长带中具有与光纤传输线的极性相反的损耗斜率。 色散补偿模块的一个应用包括作为色散补偿装置的色散补偿光纤和掺杂有过渡金属元素作为损耗均衡装置的光纤。 通过上述配置,可以通过色散补偿模块中的损耗均衡装置来调整包括色散补偿模块的整个传输线中各个信号波长之间的损耗波动,从而在适当的范围内失败。
    • 8. 发明授权
    • Dispersion-shifted fiber
    • 色散位移光纤
    • US06181858B2
    • 2001-01-30
    • US09022033
    • 1998-02-11
    • Takatoshi KatoToshiaki OkunoEisuke Sasaoka
    • Takatoshi KatoToshiaki OkunoEisuke Sasaoka
    • G02B616
    • G02B6/03644G02B6/02014G02B6/02242G02B6/03611G02B6/03627
    • The present invention provides a dispersion-shifted fiber which can effectively restrain nonlinear optical effects from occurring and is suitable for long-haul transmission. As characteristics at a wavelength of 1,550 nm, this dispersion-shifted fiber has a dispersion whose absolute value is from 1.0 to 4.5 ps/nm/km, an effective core cross-sectional area of at least 70 &mgr;m2, a cutoff wavelength of at least 1,300 nm at a fiber length of 2 m, and a dispersion slope of 0.05 to 0.09 ps/nm2/km. Also, in this dispersion-shifted fiber, the position where the optical power distribution in the fundamental mode of the signal light is maximized is radially separated from the center of the core region by a predetermined distance, and, when the optical power in the fundamental mode of signal light at the center of core region is P0, and the maximum value of the optical power distribution in the fundamental mode is P1, the maximum value P1 is greater than the value of 1.2 times the optical power P0 at the center of core region.
    • 本发明提供一种可以有效地抑制非线性光学效应发生并适合长距离传输的色散位移光纤。 作为波长为1,550nm的特性,该色散位移光纤的绝对值为1.0〜4.5ps / nm / km,有效芯截面积为70μm2以上,截止波长至少为 纤维长度为2μm的1,300nm,色散斜率为0.05〜0.09ps / nm 2 / km。 此外,在这种色散位移光纤中,信号光的基模中的光功率分布最大的位置与芯区的中心径向分开预定的距离,并且当基波中的光功率 核心区域中心的信号光模式为P0,基模光功率分布的最大值为P1,最大值P1大于核心中心光功率P0的1.2倍 地区。
    • 9. 发明授权
    • Dispersion-compensating system
    • 色散补偿系统
    • US07292748B2
    • 2007-11-06
    • US11452958
    • 2006-06-15
    • Masao TsukitaniEisuke SasaokaToshiaki Okuno
    • Masao TsukitaniEisuke SasaokaToshiaki Okuno
    • G02B6/28
    • G02B6/02223G02B6/02242G02B6/02261G02B6/03627G02B6/03633G02B6/03644G02B6/29317G02B6/29377G02B6/29394H04B10/25133H04B10/291H04B2210/258
    • In the dispersion-compensating system of the present invention, a demultiplexer demultiplexes optical signals in a signal wavelength band of 1520 nm to 1620 nm propagating through a first common transmission line into C band (1520 nm to 1565 nm) and L band (1565 nm to 1620 nm). Then, the demultiplexer outputs the optical signals of C band into a first branched transmission line and the optical signals of L band into a second branched transmission line. A first dispersion-compensating device is provided on the first common transmission line and compensates for the dispersion in C and L bands. A second dispersion-compensating device is provided on the second branched transmission line and compensates for the dispersion in L band, which has not fully been compensated for by the first dispersion-compensating device. Hence, the dispersion of optical transmission line can fully be reduced in a wide signal light wavelength band.
    • 在本发明的色散补偿系统中,解复用器将通过第一公共传输线传播的1520nm至1620nm的信号波长带中的光信号解复用为C波段(1520nm至1565nm)和L波段(1565nm 至1620nm)。 然后,解复用器将C频带的光信号输出到第一分支传输线,并将L频带的光信号输出到第二分支传输线。 在第一公共传输线上提供第一色散补偿装置,并补偿C和L波段的色散。 在第二分支传输线上提供第二色散补偿装置,并补偿尚未完全由第一色散补偿装置补偿的L波段的色散。 因此,在宽信号光波长带中,光传输线的色散可以完全降低。
    • 10. 发明授权
    • Dispersion-compensating system
    • 色散补偿系统
    • US07079769B1
    • 2006-07-18
    • US09619395
    • 2000-07-19
    • Masa TsukitaniEisuke SasaokaToshiaki Okuno
    • Masa TsukitaniEisuke SasaokaToshiaki Okuno
    • G02B6/00H04J14/02
    • G02B6/02223G02B6/02242G02B6/02261G02B6/03627G02B6/03633G02B6/03644G02B6/29317G02B6/29377G02B6/29394H04B10/25133H04B10/291H04B2210/258
    • In the dispersion-compensating system of the present invention, a demultiplexer demultiplexes optical signals in a signal wavelength band of 1520 nm to 1620 nm propagating through a first common transmission line into C band (1520 nm to 1565 nm) and L band (1565 nm to 1620 nm). Then, the demultiplexer outputs the optical signals of C band into a first branched transmission line and the optical signals of L band into a second branched transmission line. A first dispersion-compensating device is provided on the first common transmission line and compensates for the dispersion in C and L bands. A second dispersion-compensating device is provided on the second branched transmission line and compensates for the dispersion in L band, which has not fully been compensated for by the first dispersion-compensating device. Hence, the dispersion of optical transmission line can fully be reduced in a wide signal light wavelength band.
    • 在本发明的色散补偿系统中,解复用器将通过第一公共传输线传播的1520nm至1620nm的信号波长带中的光信号解复用为C波段(1520nm至1565nm)和L波段(1565nm 至1620nm)。 然后,解复用器将C频带的光信号输出到第一分支传输线,并将L频带的光信号输出到第二分支传输线。 在第一公共传输线上提供第一色散补偿装置,并补偿C和L波段的色散。 在第二分支传输线上提供第二色散补偿装置,并补偿尚未完全由第一色散补偿装置补偿的L波段的色散。 因此,在宽信号光波长带中,光传输线的色散可以完全降低。