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Fourth generation mobile networks, such as LTE Release 10, increases the demand for carrier backhaul capacity to gigabits per second. With mobile backhaul networks migrating from TDM-based to packet-switched network infrastructures, the transport technology needs to face synchronization requirements. This article describes the results of frequency synchronization measurements in working SyncE network on a mobile carrier premises. Ill. 7, bibl. 6, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.114.8.691

Fiber optics telecommunication systems (FOTS) are developing at a very high rate. The reasons for this steady growth include the availability of optical fibers with small attenuation and dispersion characteristics, invention of powerful and narrow band lasers, development of high-speed optical modulators and use of very sensitive optical receivers. Due to rapidly growing capacity requirements for FOTS high-speed high-density wavelength division multiplexing (HDWDM) systems are advancing into high data transmission rate and narrow channel spacing is used to utilize the available bandwidth more effectively [1]. In HDWDM communication systems optical wave’s polarization becomes the main effect. In principle, external electric, magnetic and electromagnetic (EM) fields can affect light transmission in optical fibers through Kerr effect, Faraday effect and Pockels effect.