Light amplifying optical fiber
    40.
    发明申请
    Light amplifying optical fiber 审中-公开
    光放大光纤

    公开(公告)号:US20020003937A1

    公开(公告)日:2002-01-10

    申请号:US09897140

    申请日:2001-07-03

    Inventor: Keiichi Aiso

    Abstract: In an optical communication and the like, a light amplifying optical fiber is capable of amplifying an optical signal having a wavelength in the vicinity of at least 1.57 to 1.62 nullm by a high gain. A cladding (5) is formed on the side of an outer peripheral portion of a core (1) to which erbium is added, and a refractive index of the cladding is smaller than that of the core (1). A relative refractive index difference nullnullnull of the core (1) with respect to the cladding (5) is made equal to 0.3% or larger, and also equal to 1% or smaller. While a composition of the core (1) is made of ErnullAl2O3nullGeO2nullSiO2, a composition of the cladding (5) is made of SiO2, erbium is added to the entire region of the core, and concentration of this erbium is selected to be 1,000 wtppm, and also a cut-off wavelength of the optical fiber is selected to be 1,400 nm. While the cut-off wavelength of the optical fiber is made constant, since the relative refractive index difference nullnullnull is selected to be an optimum value, a diameter of the core may become an optimum value. Lowering of the gain caused by a bending loss of the optical fiber can be avoided, and an erbium absorption amount per unit length of the optical fiber can be increased, and further, a gain per unit length of the optical fiber can be increased

    Abstract translation: 在光通信等中,光放大光纤能够通过高增益来放大波长在1.57〜1.62附近的光信号。 在添加有铒的芯(1)的外周部分的一侧形成包层(5),并且包层的折射率小于芯(1)的折射率。 芯(1)相对于包层(5)的相对折射率差“DELTA”等于或大于0.3%,也等于1%或更小。 虽然芯(1)的组成由Er-Al 2 O 3 -GeO 2 -SiO 2制成,但是包层(5)的组成由SiO 2制成,铒被加入到芯的整个区域,该铒的浓度为 选择为1,000重量ppm,并且光纤的截止波长也选择为1400nm。 当光纤的截止波长保持恒定时,由于相对折射率差“DELTA”被选择为最佳值,所以芯的直径可以成为最佳值。 可以避免由于光纤的弯曲损耗引起的增益的降低,并且能够提高光纤的每单位长度的铒吸收量,进一步增加光纤的单位长度的增益

Patent Agency Ranking