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    • 3. 发明申请
    • OPTICAL FIBER AND OPTICAL COMMUNICATION SYSTEM INCLUDING SAME
    • 光纤和光通信系统,包括它们
    • US20110211788A1
    • 2011-09-01
    • US13033101
    • 2011-02-23
    • Yoshinori YamamotoMasaaki Hirano
    • Yoshinori YamamotoMasaaki Hirano
    • G02B6/26
    • G02B6/02019G02B6/02395G02B6/03627
    • The invention relates to an optical fiber employable in an optical communication system using Raman amplification and adapted to improve OSNR and suppress bending loss at the same time, and the like. The optical fiber is a silica-based optical fiber having a depressed refractive index profile constituted by at least a core, an inner cladding having a low refractive index, and an outer cladding, an effective area Aeff of 110 μm2 or more at the wavelength of 1550 nm, and a fiber cutoff wavelength λC of 1.3 μm or more but 1.53 μm or less. The depressed refractive index profile is designed such that the ratio Ra(=2b/2a) of the diameter of the inner cladding to the diameter of the core is 2.5 or more but 3.5 or less and that the relative refractive index difference Δ− of the inner cladding with respect to the outer cladding is at least the relative refractive index difference Δ−min where the bending loss at the wavelength for use is minimized but not exceeding (Δ−min+0.06) %.
    • 本发明涉及一种可用于使用拉曼放大并适于改善OSNR并同时抑制弯曲损耗等的光通信系统中的光纤。 光纤是具有由至少芯部,折射率低的内包层和外包层构成的折射率分布凹陷的二氧化硅系光纤,波长为110μm2以上的有效面积Aeff为110μm2以上 1550nm,纤维截止波长λC为1.3μm以上且1.53μm以下。 凹陷折射率分布被设计成使得内包层的直径与芯的直径的比Ra(= 2b / 2a)为2.5以上至3.5或更小,并且相对折射率差Dgr 相对于外包层的内包层至少为使用波长处的弯曲损耗最小但不超过(&Dgr; -min + 0.06)%的相对折射率差Dgr·min。
    • 4. 发明授权
    • Optical fiber and optical communication system including same
    • 光纤和光通信系统包括相同
    • US08655133B2
    • 2014-02-18
    • US13033101
    • 2011-02-23
    • Yoshinori YamamotoMasaaki Hirano
    • Yoshinori YamamotoMasaaki Hirano
    • G02B6/36G02B6/26G02B6/00H04B10/00H04B10/06
    • G02B6/02019G02B6/02395G02B6/03627
    • The invention relates to an optical fiber employable in an optical communication system using Raman amplification and adapted to improve OSNR and suppress bending loss at the same time, and the like. The optical fiber is a silica-based optical fiber having a depressed refractive index profile constituted by at least a core, an inner cladding having a low refractive index, and an outer cladding, an effective area Aeff of 110 μm2 or more at the wavelength of 1550 nm, and a fiber cutoff wavelength λc of 1.3 μm or more but 1.53 μm or less. The depressed refractive index profile is designed such that the ratio Ra(=2b/2a) of the diameter of the inner cladding to the diameter of the core is 2.5 or more but 3.5 or less and that the relative refractive index difference Δ− of the inner cladding with respect to the outer cladding is at least the relative refractive index difference Δ−min where the bending loss at the wavelength for use is minimized but not exceeding (Δ−min+0.06) %.
    • 本发明涉及一种可用于使用拉曼放大并适于改善OSNR并同时抑制弯曲损耗等的光通信系统中的光纤。 光纤是具有由至少芯部,低折射率的内包层和外包层构成的折射率分布凹陷的二氧化硅系光纤,波长为110m 2以上的有效面积Aeff为 1550nm,纤维截止波长lambdac为1.3μm以上1.53μm以下。 凹陷的折射率分布被设计成使得内包层的直径与芯的直径的比Ra(= 2b / 2a)为2.5以上至3.5或更小,并且相对折射率差Δ 相对于外包层的内包层至少为使用波长的弯曲损耗最小但不超过(Delta-min + 0.06)%的相对折射率差Δ-min。
    • 7. 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。