A novel coupled quantum well structure with large field induced refractive index

A novel coupled quantum well structure --- quasi-symmetric coupled quantum well (QSCQW) is proposed. In the case of low applied electric field (F = 25 kV/cm) and low absorption loss (α ~ 100 cm^(-1)), a large field-induced refractive index change (for TE mode, Δn = 0.0106; for TM mode, Δn = 0.0115)