Contents Introduction
With the descent of next generation 100-Gb/s Ethernet protocol, conventional non return-to-zero (NRZ) is perishing and the optical communication society is advancing with massive research to find the next generation spectrally efficient advanced modulation format. A combination of coherent receiver with digital signal processing (DSP) is emerging as a promising solution for 100G upgrades. One of these propitious modulation formats employing coherent detection and DSP is coherent optical orthogonal frequency division multiplexing (CO-OFDM) [1]. CO-OFDM offers a virtually unlimited tolerance against linear impairments of an optical fiber and is easily scalable to higher level modulation formats [1], [2].
