The theory and experiments of coherent optical communication began in the 1980s. Coherent optical communication systems are recognized as having high sensitivity, researchers have done a lot of research on it. Due to the development of EDFA and WDM technology, the research of coherent optical communication was once burgeoned slowly. However, as the time flows, many following problems make this theory be concerned widely again. In terms of digital communications, how to expand the capacity of C-band amplifiers, overcome the deterioration of fiber dispersion effects, and increase the capacity and range of free-space transmission have become important considerations for researchers;On the other hand, in terms of analog communication, sensitivity and dynamic range are key parameters of the system. These can all be improved by coherent optical communication technology.

The 100G coherent optical module belongs to the technical research field of long-distance transmission of 100G DWDM. It is mainly used for line-side optical transmission of 100G WDM systems. Compared with other various forms of line-side optical modules, it has better OSNR performance, sensitivity, dispersion limit, and DGD tolerance, which make it become a common choice in the industry. The key technologies include DP-QPSK modulation technology, coherent detection technology and DSP processing technology.

In short, the coherent optical communication system is a more advanced and complex optical transmission system, which is suitable for longer-distance, larger-capacity information transmission, and the technical requirements are naturally very demanding. Coherent optical communication is gradually moving from the laboratory to large-scale commercial use, and the coherent optical module based on DSP processing technology often encounters the problem of large power consumption. In the next few years.

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