ROADM DWDM WSS in optical network, Directional v/s Direction-less

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   / @opticstrans   This video animation explained, What is ROADM, why we need ROADM, ROADM v/s FOADM in a DWDM optical network. How ROADM flow works with WSS ( Wavelength selective switch)
This video is very helpful for telecommunication engineer, optical engineer, optical fiber engineer to creak an interview.
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