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首次报道使用碳封闭涂覆光纤成功制作熔锥型无源器件．通过对熔锥工艺的控制，使器件的传输特性与普通单模光纤制成的器件相当
For the first time, the successful fabrication of fused-cone passive devices using carbon-coated optical fibers was reported. Through the control of the melt taper process, the transmission characteristics of the device are equivalent to that of the ordinary single-mode fiber