ing at the mixed transmission of quantum signals and classical signals in the network, and through the analysis of the characteristics of the PM protocol, we proposes a hybrid quantum-classical optical network scheme based on PM protocol to improve the key generation rate, secure transmission distance, and so on. In addition, the QKD performance of the far-band isolation scheme is simulated. The numerical results show that not only the key generation rate of the PM protocol is high and the secure transmission distance is long, but also the key generation rate decreases slowly with the increase of transmission distance. For a small hybrid optical network, the PM protocol has the longest secure transmission distance and the highest key generation rate for long-distance transmission. For a medium-sized network, the PM and BB84 protocols still have their advantages, but the performance of the MDI protocol is the worst. For a large network, the performance of the BB84 protocol is the best, that of the PM protocol is the second, and that of the MDI protocol is the worst.