W. structure, the Q.W. can have high efficiency of Q.C.S.E. without lowing the electron-hole wave function overlap integral, causing high electroabsorption coefficient and optical modulation.

• 插入非对称针状位能势于宽量子井中，使其保有高波长变化率，同时降低波函数重叠积分对偏压之敏度感，来得到优异的光调变效率；