Joshi, Sunil, and Gaurav Sharma. “Non-Linear Distortion & Its Reduction Techniques for Coherent Optical OFDM System: A Review”. Journal of Advance Research in Electrical & Electronics Engineering (ISSN 2208-2395), vol. 2, no. 8, Aug. 2015, pp. 11-14, https://doi.org/10.53555/nneee.v2i8.179.