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midopt electrical components include single heterojunction, double heterojunction, and quantum well laser diodes. Quantum well laser diodes have the advantages of low threshold current and high output power, making them mainstream products in market applications. Compared to lasers, laser diodes offer higher efficiency, smaller size, and longer service life, but their low output power, poor linearity, and suboptimal monochromaticity greatly limit their application in cable television systems, preventing the transmission of multi-channel, high-performance analog signals. In the return path module of a bidirectional optical receiver, upstream transmission generally uses quantum well lasers.