Investigation on Dispersion Methods For Smart Optical Fiber Supported Wired/Wireless Broadband Access Networks

Abstract

The worldwide telecommunication technology industries are moving very fast toprovide service including 4G and beyond with many Wired and Wireless-BroadbandAccess Networks (WW-BAN) standards. Ethiopian Telecommunication Corporation(ETC) has started telecommunication service, which is offering urban to rural more thanfour decades and it is operating with fiber optic network as backbone in entire Ethiopia.ETC has Optical Transport Network (OTN) in the transmission system set up. OTN hasmany series of Optical Switching and Networking (OSN) and it is interfacing line ratefrom 625 Mbps up to 80 Gbps. Since 2014, the recent telecommunication transmissionsare distributing all the line rates from OTN to all over Ethiopia, with differentarchitectures like Gigabit / Gigabit Ethernet Passive Optical Network (GPON /GEPON),Course / Wavelength / Dense Wavelength Division Multiplexing (CWDM / WDM /DWDM). Presently, ETC is providing high bit rate / line rate (HBR/HLR) throughbackbone Optical Fiber -BAN (OF-BAN) from Addis Ababa core network to ruralnetwork and finally access wireless through microwave and Radio Frequency (RF) linkconversions. The ETC with OTN and network topological configurations helps to accesspresent Wi-Fi / WiMAX as per the IEEE 802.11 / 802.16 standards. Though, HLRprovision using OTN is in Ethiopia, still a major constraint is unable to access HBR fromOF-BAN. Especially, growing Fiber -to -the-Home (FTTH) with various Passive OpticalNetworks (PONs) and multiplexing secured architectures have affected by manyinterference’s occurrences in the OF-BAN medium due to the linear / Non-linear effectsand mainly Chromatic and Dispersion (CD). Hence, the OF-BAN degrades and unable toprovide necessary received signal powers and HLR support to end users. In this researchwork, we have taken a complete study about the optical fiber effective utilization forOptical Wired / Wireless -BAN (OWW-BAN), accessing issues in Dynamic BandwidthAllocation (DBA) 10 Gbps and beyond with measuring parameters of GEPON /GPON -DWDM PON. In addition, we analyzed the CD, dispersion co-efficient impacts, opticalmodulator, optical amplifier, and other non-linear effects performance for long distancetransmission with available and collected ETC data measures. In particular, theexperiment as a fiber transmission model to support for HBR 10 – 20 Gbps WDM /DWDM GPON using hybrid OAs at input OSP 20 dBm have in smooth operation. Iniiispecific, the 4 x 4 WDM / DWDM GPON architectures are supporting maximum of 5,20, 40 and 80 Gbps since each channel of 4x4 WDM / DWDM considered to transporthigh bandwidth with 1.25, 5, 10 and 20 Gbps.