Investigation on four wave mixing effect in various optical Fibers for different spectral efficient orthogonal modulation Formats

• FWM effect in different spectral efficient orthogonal modulation formats.
• FWM in orthogonal modulation formats for WDM systems.
• Different channel spacing analysis using orthogonal modulation formats.

The paper analyzes the four wave mixing (FWM) effect in different spectral efficient orthognal modulation formats at equal channel spacing of 100 GHz and 50 GHz to design long haul wavelength division multiplexing (WDM) optical system. Further, the comparison of reduction of FWM for existing and proposed modulation format have been analyzed by varying the laser input power from −10 dBm to 10 dBm.