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    • 3. 发明申请
    • SINGLE-MODE OPTICAL FIBER
    • 单模光纤
    • US20080101755A1
    • 2008-05-01
    • US11951005
    • 2007-12-05
    • Shoichiro MATSUOKuniharu Himeno
    • Shoichiro MATSUOKuniharu Himeno
    • G02B6/02G02B6/036
    • G02B6/03611G02B6/02G02B6/02004G02B6/0281G02B6/03627G02B6/03633G02B6/03644G02B6/0365G02B6/03666
    • A single-mode optical fiber has a prescribed mode field diameter (MFD1 (μm)) at a first wavelength λ1, in which a bending loss when measured at a second wavelength λ2 (μm) and wound with a bending radius r (mm) is Lb (dB) for one bending, a connector/splice loss with an optical fiber that has a prescribed mode field diameter MFD2 (μm) at the first wavelength λ1 is Ls (dB) for one connection/splice point at the second wavelength λ2 (μm), and an mode field diameter dependence of a total loss coefficient calculated by a formula (1) has a local minimal value in a range of MFD1±0.5 μm, with the formula (1) being as follows: L=ws·Ls+wb·Lb,  (1) ws+wb=1,  (2) ws>0, wb>0,  (3) where ws and wb in the formula (1) represent dimensionless weighting factors and are set within a range that satisfies the formulas (2) and (3).
    • 单模光纤在第一波长λ1> 1处具有规定的模场直径(MFD <1>(mum)),其中在第二波长λ1处测量时的弯曲损耗 波长λ2(mum)并以弯曲半径r(mm)卷绕,对于一次弯曲为L b(dB),光纤的连接器/接头损耗为 对于一个连接/接合点,具有第一波长λ1的规定模场直径MFD 2(mum)为L s(S / S) 在第二波长λ2(mum)下,由公式(1)计算的总损耗系数的模场直径依赖性在MFD <1>的范围内具有局部最小值, /SUB>+0.5 mum,公式(1)如下:<?in-line-formula description =“In-line Formulas”end =“lead”?> L = w (1)<?在线公式描述=“在线公式”结束 =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead” ?>>>>>,<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ?in-line-formula description =“In-line Formulas”end =“lead”?> w > 0,w > 0,(3)<? 在公式(1)中,在公式(1)中,其中w 和w 表示无量纲加权因子(in-line-formula description =“In-line Formulas”end =“tail” 并且设定在满足式(2)和(3)的范围内。
    • 4. 发明授权
    • Single-mode optical fiber
    • 单模光纤
    • US07366387B2
    • 2008-04-29
    • US11673471
    • 2007-02-09
    • Shoichiro MatsuoKuniharu Himeno
    • Shoichiro MatsuoKuniharu Himeno
    • G02B6/02
    • G02B6/03611G02B6/02G02B6/02004G02B6/0281G02B6/03627G02B6/03633G02B6/03644G02B6/0365G02B6/03666
    • A single-mode optical fiber has a prescribed mode field diameter (MFD1 (μm)) at a first wavelength λ1, in which a bending loss when measured at a second wavelength λ2 (μm) and wound with a bending radius r (mm) is Lb (dB) for one bending, a connector/splice loss with an optical fiber that has a prescribed mode field diameter MFD2 (μm) at the first wavelength λ1 is Ls (dB) for one connection/splice point at the second wavelength λ2 (μm), and an mode field diameter dependence of a total loss coefficient calculated by a formula (1) has a local minimal value in a range of MFD1±0.5 μm, with the formula (1) being as follows: L=ws·Ls+wb·Lb,  (1) ws+wb=1,  (2) ws>0, wb>0  (3) where ws and wb in the formula (1) represent dimensionless weighting factors and are set within a range that satisfies the formulas (2) and (3).
    • 单模光纤在第一波长λ1> 1处具有规定的模场直径(MFD <1>(mum)),其中在第二波长λ1处测量时的弯曲损耗 波长λ2(mum)并以弯曲半径r(mm)卷绕,对于一次弯曲为L b(dB),光纤的连接器/接头损耗为 对于一个连接/接合点,具有第一波长λ1的规定模场直径MFD 2(mum)为L s(S / S) 在第二波长λ2(mum)下,由公式(1)计算的总损耗系数的模场直径依赖性在MFD <1>的范围内具有局部最小值, /SUB>+0.5 mum,公式(1)如下:<?in-line-formula description =“In-line Formulas”end =“lead”?> L = w (1)<?在线公式描述=“在线公式”结束 =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead”? &lt;&lt;&lt;&lt; b&lt; b&gt; = 1,(2)<?in-line-formula description =“In-line Formulas”end =“tail”?> in-line-formula description =“In-line Formulas”end =“lead”?> w > 0,w > 0(3) 公式(1)中的公式描述=“在线公式”end =“tail”?>其中w(x)和w(b))表示无量纲加权因子, 设定在满足公式(2)和(3)的范围内。
    • 5. 发明授权
    • Optical fiber
    • 光纤
    • US07164835B2
    • 2007-01-16
    • US11244195
    • 2005-10-06
    • Shoichiro MatsuoKuniharu HimenoKoichi HaradaMasataka Ikeda
    • Shoichiro MatsuoKuniharu HimenoKoichi HaradaMasataka Ikeda
    • G02B6/036
    • G02B6/02009G02B6/0365G02B6/03672G02B6/03688
    • An optical fiber includes: a core at a center; a first cladding layer; a second cladding layer; and a third cladding layer. A maximum refractive index of the core is greater than any of maximum refractive indices of the first cladding layer, the second cladding layer, and the third cladding layer, and the maximum refractive index of the second cladding layer is smaller than any of the maximum refractive indices of the first and the third cladding layer. Additionally, a ratio of a2/a1 is not less than about 2.5 and not more than about 4.5, where a1 represents the radius of the core, and a2 represents the radius of an outer periphery of the first cladding layer, and a relative refractive index difference of the core with respect to a maximum refractive index of the third cladding layer is not less than 0.20% and not more than 0.70%.
    • 光纤包括:中心的芯; 第一包层; 第二覆层; 和第三覆层。 芯的最大折射率大于第一包层,第二包层和第三包层的最大折射率中的任何一个,并且第二包层的最大折射率小于任何最大折射率 第一和第三包层的指数。 此外,2×2 / a <1的比例不小于约2.5且不大于约4.5,其中1表示芯的半径,而2 表示第一包层的外周的半径,芯相对于第三包层的最大折射率的相对折射率差为0.20%以上且0.70%以下。
    • 6. 发明授权
    • Optical fiber and optical transmission path that uses the optical fiber
    • 使用光纤的光纤和光传输路径
    • US06928211B2
    • 2005-08-09
    • US10636552
    • 2003-08-08
    • Shoji TanigawaShoichiro MatsuoKuniharu Himeno
    • Shoji TanigawaShoichiro MatsuoKuniharu Himeno
    • G02B6/036G02B6/02
    • G02B6/02271G02B6/02G02B6/02014G02B6/03611
    • There is provided at low cost an optical fiber suitable for wavelength division multiplex transmissions that has strengthened the tolerance to bending loss at even smaller bending diameters. The present invention is an optical fiber whose base material is silica glass and that has a two layer structure formed by a core that has a substantially uniform refractive index and by a cladding that is located outside the core and that has a substantially uniform refractive index, wherein the optical fiber satisfies the following conditions (1) to (3): (1) an outer diameter of the core is in a range of 4 to 8 μm, and a relative refractive index difference of the core is in a range of 0.4 to 0.8%; (2) chromatic dispersion at a wavelength of 1550 nm is in a range of 2 to 15 ps/nm/km; and (3) effective area at a wavelength of 1550 nm is 40 μm2 or more.
    • 以低成本提供了适用于波分复用传输的光纤,其在更小的弯曲直径下增强了对弯曲损耗的公差。 本发明是一种基材为石英玻璃的光纤,其具有由具有基本上均匀的折射率的芯构成的两层结构,以及位于芯外部并具有基本上均匀的折射率的包层, 其中光纤满足以下条件(1)至(3):(1)芯的外径在4至8μm的范围内,并且芯的相对折射率差在0.4的范围内 至0.8%; (2)波长1550nm的色散在2〜15ps / nm / km的范围内; 和(3)1550nm波长的有效面积为40μm以上。
    • 9. 发明申请
    • SINGLE-MODE OPTICAL FIBER
    • 单模光纤
    • US20070189684A1
    • 2007-08-16
    • US11673471
    • 2007-02-09
    • Shoichiro MatsuoKuniharu Himeno
    • Shoichiro MatsuoKuniharu Himeno
    • G02B6/02
    • G02B6/03611G02B6/02G02B6/02004G02B6/0281G02B6/03627G02B6/03633G02B6/03644G02B6/0365G02B6/03666
    • A single-mode optical fiber has a prescribed mode field diameter (MFD1 (μm)) at a first wavelength λ1, in which a bending loss when measured at a second wavelength λ2 (μm) and wound with a bending radius r (mm) is Lb (dB) for one bending, a connector/splice loss with an optical fiber that has a prescribed mode field diameter MFD2 (μm) at the first wavelength λ1 is Ls (dB) for one connection/splice point at the second wavelength λ2 (μm), and an mode field diameter dependence of a total loss coefficient calculated by a formula (1) has a local minimal value in a range of MFD1±0.5 μm, with the formula (1) being as follows: L=ws·Ls+wb·Lb,  (1) ws+wb=1,  (2) ws>0, wb>0.  (3) where ws and wb in the formula (1) represent dimensionless weighting factors and are set within a range that satisfies the formulas (2) and (3).
    • 单模光纤在第一波长λ1> 1处具有规定的模场直径(MFD <1>(mum)),其中在第二波长λ1处测量时的弯曲损耗 波长λ2(mum)并以弯曲半径r(mm)卷绕,对于一次弯曲为L b(dB),光纤的连接器/接头损耗为 对于一个连接/接合点,具有第一波长λ1的规定模场直径MFD 2(mum)为L s(S / S) 在第二波长λ2(mum)下,由公式(1)计算的总损耗系数的模场直径依赖性在MFD <1>的范围内具有局部最小值, /SUB>+0.5 mum,公式(1)如下:<?in-line-formula description =“In-line Formulas”end =“lead”?> L = w (1)<?在线公式描述=“在线公式”结束 =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead” ?>>>>>,<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ?in-line-formula description =“In-line Formulas”end =“lead”?> w > 0,w > 0。 (3)式(1)中的&lt;&lt; S&gt;和&lt; b&lt; b&lt; )表示无量纲加权因子,并设定在满足公式(2)和(3)的范围内。