Passive Optical Network (PON) 
            
            
            
		
            
            
			Passive optical 
            (access) networks (PONs) enable bidirectional communication between 
            a server and a set of customers. The main challenge in these 
            networks is to design such a system based on WDM technology, in 
            which the equipment at the customers' side is as cheap, simple, and 
            durable as possible, but above all, identical for all customers (or 
            else it will create impossible management overheads, since it will 
            be necessary to ensure that no two customers have identical 
            wavelength-specific devices). This topic and SuperPON architectures 
            and more detailed concept will be treated separately.
            
              
		
		
		
		
		
		  
			  
            
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