Introduction To Laser Diodes

       Laser diodes include single heterojunction (SH), double heterojunction (DH), and quantum well (QW) laser diodes. Quantum well laser diodes have the advantages of low threshold current and high output power, and are the mainstream products in the market. Compared with lasers, laser diodes have the advantages of high efficiency, small size and long life, but their output power is small (generally less than 2mW), linearity and monochromaticity are not good, so their applications in cable TV systems are affected. Very limited, can not transmit multi-channel, high-performance analog signals. In the backhaul module of the bidirectional optical receiver, the uplink transmission generally uses a quantum well laser diode as a light source.