The full-duplexFull-duplex optical communications can be achieved simply by separating the transmitting link and the receiving link in the space. However, it is challenging to achieve the non-line-of-sightNon-line-of-sight (NLOS) full-duplex ultraviolet (UV) communication due to the serious self-interferenceSelf-interference caused by the strong multiple scattering effectsScattering effect of UV signalsUltraviolet signals. In this chapter, we first describe the self-interferenceSelf-interference channel by using an analytical channel impulse response (CIR)Channel impulse response function and quantify the self-interferenceSelf-interference based on the CIR in Sect. 4.1. Then, based on the quantified self-interferenceSelf-interference, we present the bit-error rate (BER) and the corresponding achievable information rate (AIR) for on-off keying modulation and 4-pulse-position modulation in Sect. 4.2. Furthermore, We introduce a self-interferenceSelf-interference cancellingSelf-interference cancelling (SIC) method to mitigate the impacts of self-interferencesSelf-interference in Sect. 4.3. In Sect. 4.4, we present some numerical results to explore the BER and AIR performance of full-duplexFull-duplex UV communication. Simulation results show that the SIC method can significantly improve the error rate and AIR performances. At last, we conclude this chapter in Sect. 4.5.