Optical amplifier

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PROBLEM TO BE SOLVED : To provide an optical amplifier having a simple amplifier configuration, capable of gain adjustment of each propagation mode with a small loss of excitation light.SOLUTION : A multimode optical amplifier includes : an optical fiber for amplification, having an added rare earth element, for transmitting signal light of a plurality N of propagation modes; an excitation light source for generating the excitation light to excite the optical fiber for amplification; and a multiplexer for multiplexing the excitation light with the signal light. Mode converters for exclusively converting the N propagation modes of the signal light to respectively different propagation modes are installed on the way of the optical fiber for amplification.