The textbook "Soliton Coding for Secured Optical Communication Link" offers a comprehensive analysis of the nonlinear properties of light and their application in optical communication. It illuminates the functioning of microring resonator systems (MRR), which are used to generate logic codes and to produce entangled photons. By utilizing optical solitons that create ultra-short pulses, the transmission of communication signals necessary for generating polarization-encoded photons is enabled. The book also discusses the generation of optical millimeter-wave solitons in the frequency range of 0-100 GHz and the multiplexing of these soliton signals for data transmission in network systems. The critical role of soliton signals in optical communication is emphasized, as well as the possibilities for increasing channel capacity and security through the use of optical multiplexers.