This paper presents an overview about WDM technology and recent developments in this field and how the overall capacity of the communication network can be incremented using this technology. Keywords – bandwidth, multiplexing, optical network unit, OCDM, passive. WDM is a technique that enables multiple optical signals to be transmitted over a single fiber optic cable, each at a different wavelength. The application fields of wavelength division multiplexing (WDM) integrated devices are continually expanding.
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