The paper describes the Multiplexers, De-multiplexers, current progress of WDM and the algorithms of wavelength in WDM network. WDM includes transmission of no. of signs having distinctive wavelengths in parallel on a single optical fiber. Wavelength division multiplexers are fundamental to the functioning and performance of integrated photonic circuits, with applications ranging from optical interconnects to sensing and quantum technologies. Current solutions are limited by trade-offs between channel spacing, crosstalk, insertion. Wavelength Division Multiplexing (WDM) System by Application (Optical Fiber Communications, Submarine Cables, Land-based Long Distance Communications), by Types (Coarse Wavelength-division Multiplexing (CWDM), Dense Wavelength-division Multiplexing (DWDM). This technology is finding a tremendous attention as users are multiplying day by day to use data networks. As we look ahead, the future of WDM technology.
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