Analysis of research progress of optical fiber quantum communication multiplexing technology

In order to realize classical-quantum signals simultaneous transmission sharing a same fiber in quantum communication, it is proposed that signals are transmitted over multiple separate channels. The channels are divided by different wavelengths, pseudo-codes, and spatial modes. Based on the development status of quantum communication over optical fiber, this paper expounds the demand of quantum communication for multiplexing technology, and introduces the basic principle and research status of three existing multiplexing technologies. In this paper, the key technologies involved in the multiplexing system based on few mode fiber are discussed in depth, and the problems in signal transmission are analyzed.