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激光二極管包括單異質(zhì)結(jié)（SH）、雙異質(zhì)結(jié)（DH）和量子阱（QW）激光二極管。量子阱激光二極管具有閾值電流低，輸出功率高的優(yōu)點，是市場應(yīng)用的主流產(chǎn)品。同激光器相比，激光二極管具有效率高、體積小、壽命長的優(yōu)點，但其輸出功率?。ㄒ话阈∮?mW），線性差、單色性不太好，使其在有線電視系統(tǒng)中的應(yīng)用受到很大限制，不能傳輸多頻道，高性能模擬信號。在雙向光接收機(jī)的回傳模塊中，上行發(fā)射一般都采用量子阱激光二極管作為光源。