Among the presented VOAs, thermo-optic type owns superior polarization dependence upon electro-optic one, and thermo-optic VOA can be driven with much lower power than Micro-electro-mechanic System(MEMS).

• 在已有的VOA器件中，热光波导器件具有电光器件无法比拟的偏振无关性，驱动功率也较微电机械(MEMS)器件小的多。