International Research Journal of Education and Technology

Time and Wavelength Division Multiplexed Passive Optical Network (TWDM-PON) is very competent next generation multiplexing technique and is becoming popular among researchers these days. In this proposed work, diverse placements of dispersion compensation module are explored in O band based 20 km long TWDM-PON system. Total four wavelength channels each at 25 Gbps are taken and modulated with directly modulated lasers (DMLs). Many PON systems employ digital signal processing (DSP), although this adds to the system's complexity and expense. A dispersion correction module in an optical line terminal (OLT) can be used to adjust dispersion in all channels using a single device. Dispersion compensation module is placed in three different ways such as (1) prior to the transmission fiber (2) after the transmission fiber (3) in between the fiber or inline and results are investigated in terms of Q factor, BER and received power.  

Keywords: Optical line terminal, Optical network unit, Dispersion compensation, BER, Q factor