Recently, the number of subscribers to the optical access technology has been increasing due to advantage of high-speed Internet access and peer-to-peer services. The number of fibre-to-the-home (FTTH) subscribers in Europe has increased by 22 per cent over the past ten months. In absolute numbers, Europe reached 3.2 million FTTH subscribers. Network deployment continues to bring fibre within reach of more homes: Europe now counts 18 million FTTH homes passed, for this reason Gigabit Ethernet - Passive Optical Network (GE-PON) and Gigabit - PON (G-PON) have been already commercialized [1, 2]. Another type of access technologies: wavelength division multiplexed - PON (WDM-PON) has been considered for a long time as one of the most powerful solutions for the next-generation broadband access network and has gained increasing attention due to growing need for broadband access [3]. Still the developments on WDM-PON are in academic and experimental phase, and the standards for WDM-PON have not been established yet [4].