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PROBLEM TO BE SOLVED : To provide a small-sized, highly efficient optical amplifier having a PLZT optical waveguide layer containing a rare earth element added thereto, and a manufacturing method for the optical amplifier. SOLUTION : The optical amplifier includes the optical waveguide layer which contains Pb1-xLax(ZryTi1-y)1-x/4O3(PLZT : 0COPYRIGHT : (C)2008, JPO&INPIT