Communications services delivering between user and service provider access point - the so-called "Last mile" - have always been a limiting factor in broadband telecommunications development. This problem was successfully solved using FTTx (Fiber to the X) technology. FTTx is a type of solution which provides optical fiber to user's home, apartment, or to the distribution box near these customer premises. These solutions make it possible to provide access to broadband services, that is important with so-called "Triple-play" package - data transmission, telephony and television - widespread in recent years. Scientific studies focus mainly on EPON (Ethernet Passive Optical Network - Ethernet Passive Optical Network) and GPON (Gigabit Passive Optical Network - Gigabit Passive Optical Network) technology improvements, saving the installed fiber cable plant, in compliance with recommendations, as well as new solutions studies. EPON and GPON technologies (as well as the new 10G EPON and 10G GPON) have bitrate limitations and lack of possibilities of expansion (dispersion, splitter attenuation, possible complexity of burst mode receiver). One of the solutions that can satisfy the growing bandwidth demand is WDM-PON technology. Currently there are two options for WDM-PON technology development: compatibility with first-generation PON solutions (EPON, GPON) and the creation of completely new incompatible solutions. This thesis investigates the possibility of using WDM technology in access networks, as well as determining the maximum number of users, and carries out the research of physical layer prospective realizations. The standard bitrates were chosen (1.25, 2.4, 10 Gbit/s) for the possible use of higher level protocols (Ethernet, SDH and GPON), GPON and EPON possible splitting ratios (1 × 8, 16, 32, 64, 128), as well as standardized distances (10 and 20 km).