Rare earth doped optical fibre amplifiers
    1.
    发明授权
    Rare earth doped optical fibre amplifiers 失效
    稀土掺杂光纤放大器

    公开(公告)号:US5491581A

    公开(公告)日:1996-02-13

    申请号:US154957

    申请日:1993-11-19

    申请人: Giacomo S. Roba

    发明人: Giacomo S. Roba

    摘要: An optical amplifier which includes an optical fiber having an erbium doped core surrounded by cladding, a pump for pumping the fiber with pump light at a pump wavelength coupled to the fiber, input means for inputting a signal to be amplified to the amplifier and output means for outputting an amplified signal from the amplifier. The fiber has a NA higher than 0.2. The difference in the coefficient of thermal expansion of the core adjacent the core/cladding interface and the coefficient of thermal expansion of the cladding at at least one radius less than 2 .mu.m from said interface is lower than a predetermined value, corresponding to a ratio of erbium loss to background loss, at said pump wavelength, and greater than a minimum ratio of about 20 when erbium loss is 0.15 dB/m and about 120 when erbium loss is 3.5 dB/m.

    摘要翻译: 一种光放大器,包括具有被包层包围的掺铒芯的光纤,用于以耦合到光纤的泵浦波长的泵浦光泵浦光纤的泵,用于将放大的信号输入到放大器和输出装置的输入装置 用于从放大器输出放大的信号。 纤维的NA高于0.2。 在距离所述界面的小于2μm的至少一个半径处,与芯/包覆界面相邻的芯部的热膨胀系数与包层的热膨胀系数的差异小于预定值, 在铒损耗为0.15dB / m时,铒损耗与背景损耗相比,在铒损耗为3.5dB / m时,大于20左右的最小比。