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    • 42. 发明授权
    • Single mode optical fiber with depressed trench
    • 单模光纤带凹槽
    • US08488931B2
    • 2013-07-16
    • US12902190
    • 2010-10-12
    • Marianne Bigot-AstrucPierre SillardLouis-Anne De MontmorillonDenis MolinSimon Richard
    • Marianne Bigot-AstrucPierre SillardLouis-Anne De MontmorillonDenis MolinSimon Richard
    • G02B6/02G02B6/00
    • G02B6/0365C03B2201/12C03B2201/31C03B2203/22C03B2203/23G02B6/03683G02B6/03688
    • An optical fiber having a core and an outer cladding, the core including from its center outward a central core having a radius and a refractive index difference with respect to the outer cladding, and a depressed inner cladding. The depressed inner cladding includes at least a first portion having a radius and a refractive index difference with respect to the outer cladding, the first portion preferably being adjacent to the central core, and a second portion adjacent to the first portion constituting a depressed trench having a radius, and a refractive index difference with respect to the outer cladding. The first portion of the inner cladding has a refractive index below the refractive index of the outer cladding, and the depressed trench has a refractive index that is lower than the refractive index of the first portion of the depressed inner cladding. The outer radius of the depressed inner cladding of the optical fiber is between 28 μm and 40 μm, the LP01 mode leakage losses at a wavelength of 1550 nm are less than 0.01 dB/km and the cable cut-off wavelength is less than 1530 nm.
    • 具有芯和外包层的光纤,所述芯从其中心向外包括具有相对于外包层的半径和折射率差的中心芯和凹陷的内包层。 凹陷的内包层至少包括具有相对于外包层的半径和折射率差的第一部分,第一部分优选地邻近中心芯,以及与构成凹陷槽的第一部分相邻的第二部分, 半径和相对于外包层的折射率差。 内包层的第一部分的折射率低于外包层的折射率,并且凹槽的折射率低于凹陷的内包层的第一部分的折射率。 光纤的凹陷内包层的外半径在28μm和40μm之间,1550nm波长处的LP01模式泄漏损耗小于0.01dB / km,电缆截止波长小于1530nm 。