Investigation on Maximum Available Reach for Different Modulation Formats in WDM-PON Systems

I. Kurbatska 1 , V. Bobrovs 1 , S. Spolitis 1 , P. Gavars 1 , G. Ivanovs 1  and R. Parts 1
  • 1 Institute of Telecommunications, Riga Technical University, 12 Azenes Str., LV-1048, Riga, Latvia

Abstract

Considering the growing demand for broadband of access networks, in the present paper we investigate various modulation formats as a way of increasing the performance of optical transmission systems. Non-return-to-zero (NRZ) on-off keying, return-to-zero (RZ) OOK, carrier suppressed RZ (CSRZ) OOK, duobinary (DB), NRZ differential phase shift keying (NRZDPSK), RZ-DPSK and CSRZ-DPSK formats are compared using the maximal achievable reach with bit error rate less than 10−9 as a criterion. Simulations are performed by using OptSim software tool. It is shown that using the transmission system without dispersion compensation the best results are shown by duobinary and CSRZ-OOK modulation formats, but with the system using dispersion compensating fiber (DCF) the longest transmission distance is achieved by RZ-DPSK modulation format. By investigating the influence of channel spacing for best-performed modulation formats, network reach decrease for transmission systems with DCF fiber has been observed due to channel crosstalk.

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