LARGE MODE AREA FIBER FOR LOW-LOSS TRANSMISSION AND AMPLIFICATION OF SINGLE MODE LASERS
    2.
    发明申请
    LARGE MODE AREA FIBER FOR LOW-LOSS TRANSMISSION AND AMPLIFICATION OF SINGLE MODE LASERS 审中-公开
    大模光纤用于单模激光器的低损耗传输和放大

    公开(公告)号:WO2008076162A3

    公开(公告)日:2008-08-21

    申请号:PCT/US2007020541

    申请日:2007-09-21

    Abstract: A large mode area optical fiber includes a large diameter core (d1 up to 60µm), and a first cladding (diameter d2) wherein the difference between refractive index (n1 ) in the core and the first cladding (n2) is very small (?n 0.4) (n3 is preferably less than 1.3). The small change in refractive index between the core and inner cladding combined with a large change in refractive index between the first cladding and second cladding provides a significantly improved single mode holding waveguide.

    Abstract translation: 一个大模场面积的光纤包括一个大直径纤芯(d1直至60μm)和一个第一包层(直径d2),其中纤芯中的折射率(n1)与第一包层之间的差(n2)非常小(λ2) n <.002),因此提供非常低的数值孔径芯(NA1在0.02和0.06之间)。 优选的比率d 2 / d 1 <2。与纤芯和第一包层相比,纤维还具有第二包层,优选为空气层,其具有非常低的折射率n 3,使得第一包层具有相对高的数值 孔径(NA2> 0.4)(n3优选小于1.3)。 纤芯和内包层之间的折射率的小变化与第一包层和第二包层之间的折射率的大变化相结合提供了显着改进的单模保持波导。

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