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    • 23. 发明授权
    • Optical fiber transmission-line
    • 光纤传输线
    • US06374027B1
    • 2002-04-16
    • US09636635
    • 2000-08-11
    • Masashi OnishiMasaaki HiranoTakatoshi Kato
    • Masashi OnishiMasaaki HiranoTakatoshi Kato
    • G02B602
    • G02B6/02247G02B6/29377H04B10/25253
    • There is provided an optical fiber transmission-line with which the four-wave mixing generation can be suppressed effectively and also transmission loss is small. An optical fiber transmission-line 10 is dispersion-managed by a single silica optical fiber thereof being provided alternately in its longitudinal direction with parts 10a where the chromatic dispersion at the wavelength 1550 nm is positive and parts 10b where it is negative. In any one repeater span of the transmission-line there are at least four sign change positions P at which the sign of the chromatic dispersion changes in the longitudinal direction; the absolute value of the average changing rate of chromatic dispersion in each sign change locality A, each sign change locality A being a range including a sign change position P over which the absolute value of the chromatic dispersion is less than 2 ps/nm/km, is not less than 0.008 ps/nm/km/m and not greater than 4 ps/nm/km/m; the absolute value of the average value of the chromatic dispersion over the whole conduit is not greater than 2 ps/nm/km; the average value of the effective core area over the whole transmission-line is not less than 50 &mgr;m2; the average value of the transmission loss over the whole transmission-line is not greater than 0.25 dB/km; and the average value of the polarization mode dispersion over the whole transmission-line is not greater than 0.2 ps/km/½.
    • 提供了能够有效抑制四波混频发生的光纤传输线,并且传输损耗小。 光纤传输线10由其单个二氧化硅光纤沿其纵向交替地与波长1550nm的色散为正的部分10a和其中为负的部分10b分散管理。 在传输线的任何一个中继器跨度中,至少有四个符号改变位置P,其中色散的符号在纵向方向上变化; 每个符号改变位置A中的色散的平均变化率的绝对值,每个符号改变位置A是包括色散的绝对值小于2ps / nm / km的符号改变位置P的范围 不小于0.008ps / nm / km / m且不大于4ps / nm / km / m; 整个导管上色散平均值的绝对值不大于2 ps / nm / km; 整个传输线有效核心区域的平均值不小于50 mum2; 整个传输线的传输损耗平均值不大于0.25 dB / km; 并且整个传输线上的偏振模色散的平均值不大于0.2ps / km /½。
    • 30. 发明授权
    • Apparatus and method for measuring chromatic dispersion
    • 用于测量色散的装置和方法
    • US08395762B2
    • 2013-03-12
    • US12647267
    • 2009-12-24
    • Masaaki HiranoToshiki Taru
    • Masaaki HiranoToshiki Taru
    • G01N21/00H04B10/08H04B17/00
    • G01M11/338
    • Highly accurate measurement of chromatic dispersions of a device under test that is an optical component is enabled with a simple structure comprising: propagating pump light having a wavelength λpump and probe light having a wavelength λprobe through the device; calculating the generation efficiency of the idler light with respect to the wavelength λpump by measuring the power of idler light having a wavelength λidler output from the device according to four-wave mixing generated in the device; seeking the frequency difference or wavelength difference between the pump light and the probe light that makes an extremum of generation efficiency of the idler light; calculating phase mismatch among the pump light wavelength having such frequency difference or wavelength difference, the probe light wavelength, and the idler light wavelength; and on the basis of such calculation results, calculating the chromatic dispersion of the device at the wavelength λpump.
    • 通过简单的结构实现了作为光学部件的被测器件的色散的高精度测量,包括:通过器件传播具有波长λpump的泵浦光和具有波长λ探针的探测光; 通过根据在装置中产生的四波混频测量从器件输出的具有波长λidler的惰性光的功率来计算相对于波长λpump的惰轮光的发生效率; 寻求激发光的发光效率极值的泵浦光和探测光之间的频差或波长差; 计算具有这样的频率差或波长差的泵浦光波长,探测光波长和惰轮波长的相位失配; 并且基于这样的计算结果,计算波长λpump处的器件的色散。