MULTICORE OPTICAL FIBER AMPLIFIER AND OPTICAL AMPLIFICATION METHOD USING MULTICORE OPTICAL FIBER AMP

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In a multicore optical fiber amplifier using cladding excitation, it is difficult to control the generation of an optical surge due to penetration of signal light into a core in a non-signal-light state without fluctuation of the gain of the core to which the signal light penetrates, and therefore this multicore optical fiber amplifier has : a multicore optical fiber amplification medium having inside a cladding a plurality of cores to which rare-earth elements have been added; a signal light introduction means for introducing, into each of the cores, signal light having a wavelength within the gain band of the multicore optical fiber amplification medium; an excitation light introduction means for introducing into the cladding excitation light for exciting the multicore optical fiber amplification medium; and a control light introduction means for introducing control light into each of the plurality of cores, the control light introduction means introducing the control light into a non-signal core, among the plurality of cores, into which the signal light has not been introduced, only when the excitation light has been introduced.