Uddin, M. N., and I. S. Bristy. “Performance Analysis of 16-Channel Hybrid WDM- CSRZ-DQPSK PON for Different Transmission Speeds and Distances ”. AIUB Journal of Science and Engineering (AJSE), Vol. 19, no. 1, Apr. 2020, pp. 19 -24, http://ajse.aiub.edu/index.php/ajse/article/view/51.