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To achieve better calculative performance in optical fiber communication and for simplicity of
implementation different digital modulation, detection and multiplexing techniques are used. These
techniques maximize the spectral efficiency. This paper reviews a tabular comparative analysis with 3D
graphical representation for different optical digital modulation formats and multiplexing techniques
within and beyond 400 Gb/s. In this particular article we survey about different parameters related to
digital fiber optic communication.