A.3 B.4 C.5 D.7
A.光檢測器,光放大器,激光器 B.PIN光電二極管,APD雪崩二極管 C.半導體激光器,光電檢測器,發(fā)光二極管 D.半導體激光器LD,半導體發(fā)光二極管LED