METHOD FOR PRODUCING OPTICAL FIBER PREFORM, AND OPTICAL FIBER

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PROBLEM TO BE SOLVED : To provide an optical fiber having a large effective cross-sectional area (Aeff), in which the concentration of a rare earth element is easily controlled and generation of a nonlinear optical effect is effectively suppressed in a fiber amplifier or a fiber laser, and to provide a method for producing an optical fiber preform suitable for the production of the optical fiber. SOLUTION : The method for producing an optical fiber preform in which a rare earth element is added into the core comprises : a step of depositing fine glass particles which are mainly composed of silicon dioxide within a quartz tube by a MCVD method; a step of adding the rare earth element and aluminum into the fine glass particles within the quartz tube by an immersion method; a step of heating the quartz tube while allowing a phosphorus-containing gas to flow into the quartz tube, so as to sinter the fine glass particles within the quartz tube while adding phosphorus thereinto; and a step of heating and collapsing the quartz tube, into which the rare earth element, the aluminum and the phosphorus have been added. COPYRIGHT : (C)2011, JPO&INPIT