Compared with the traditional optic

Compared with the traditional optical communication system which only has intensity modulation, the coherent optical communication system has many modulation methods, such as PSK, DPSK, QAM, which increases the complexity of the communication system, but the application is very flexible. The traditional optical receiver only has the corresponding when the optical power changes, but the coherent optical receiver carries all the information of amplitude, frequency, phase and polarization state Corresponding. So coherent detection is a holographic detection technology, which is not available in traditional optical communication technology.In a word, there are many directions of coherent optical communication technology that need more research, and large-scale applications will not appear in the short term. However, the demand determines the market. In the near future, the simple structure of the traditional optical communication system will not meet the high-speed growth of the bandwidth demand. As a relatively mature research, coherent optical communication technology has obvious potential advantages, and will be paid more and more attention by academia and enterprises.