Due to the excellent electro-optic properties of lead lanthanum zirconium titanate ((Pb,La)(Zr,Ti)O3, PLZT), compact 1×2 and 1×4 PLZT optical switches with a high response speed are proposed and fabricated successfully in this Letter. By introducing a thin isolating layer between the waveguides and the electrodes, the absorption loss of the fabricated 1×2 PLZT switch caused by the electrodes is reduced 8.9 dB with a relatively low driving voltage. The 1×2 PLZT switch shows an insertion loss of 1
