| 摘要 |
An optical amplifier including an optical waveguide layer (for example channel-shaped optical waveguide layer) including Pb1-xLax(ZryTi1-y)1-x/4O3(PLZT: 0<x<0.3, 0<y<1.0) doped with a rare earth element at an amount of 0.2 mol % to 11.0 mol %, the optical waveguide layer (for example channel-shaped optical waveguide layer) being formed as a single crystal film by solid-phase epitaxial growth.
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