Computer Science – Other Computer Science
Scientific paper
2010-04-26
Journal of Telecommunications, Volume 2, Issue 1, p60-67, April 2010
Computer Science
Other Computer Science
Md. Shamim Reza, Md. Maruf Hossain, Adnan Ahmed Chowdhury, S. M. Shamim Reza and Md. Moshiur Rahman, "Performance Evaluation o
Scientific paper
This paper investigates the theoretical performance analysis for a subcarrier multiplexed (SCM) wavelength division multiplexing (WDM) optical transmission system in presence of optical beat interference (OBI) which occurs during the photo detection process. We have presented a comparison for improving the performance of SCM-WDM system in presence of OBI. Non-return-to zero (NRZ), Manchester and Miller code (MC) line coding are used for performance investigation of SCM-WDM system. A suitable signal bandwidth is selected and 200 KHz is considered as channel bandwidth. Power spectrum of signal and cross component for those line coding are analyzed. Comparison results are evaluated in terms of signal to OBI ratio for the three linecoding schemes which is called signal to interference ratio (SIR). It is found that there is a significant increase in the SIR by employing Miller code compared to NRZ and Manchester for the same data rate. For example, for a number of subcarriers of 10, the achievable SIR is about -24 dB for Miller coded system compared to -46 dB for NRZ coded system and -49 dB for Manchester coded system. The results are found to be satisfactorily agreed with the expected results.
Chowdhury Adnan Ahmed
Hossain Maruf Md.
Rahman Moshiur Md.
Reza Shamim Md.
Shamim Reza S. M.
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