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[EFM] about the link model

Hi£¬ Thomas:
I had seen your presentation file "Laser considerations for link budget", it is very helpful for me to calculate the 
power budget, I found the BWm parameter(fiber model bandwidth) you used is 100GHz*km, but I found in 10Gb Ethernet link model and PON link model the parameter is 1000GHz*km, I don't know how to calculate or how to measure the BWm of a single mode fiber, which parameter is right?  
best regards

		xu zhang
		bu. tele. tech. co, ltd
                Email: zhangx@xxxxxxxx