What is Coherent Optical Communication?

Many people may think that coherent optical communication is the use of coherent light for transmission communication, which is incorrect actually. Coherent optical communication and non-coherent optical communication basically use lasers without any essential difference in terms of light.

The reason why coherent optical communication is called “coherent optical communication” does not depend on the light used in the transmission process, but on the use of coherent modulation at the transmitting end and the use of coherent technology at the receiving end for detection.

The difference between the two is at both ends, not on the transmission path. The technology of the receiving end is the core of the entire coherent optical communication, and it is also the main reason why it is so powerful. Under the same conditions, compared with traditional non-coherent optical communication, the receiver of coherent optical communication can improve the sensitivity by 20db– 100 times more sensitive than the non-coherent communication! With the help of this 20db, the communication distance of coherent optical communication can reach the level of thousands of kilometers (non-coherent light is only about tens of kilometers).

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