If I convert my 1310nm signal to an xWDM wavelength do I have to convert it back to 1310nm before the far end receiver?
No, typically not. Most optical equipment built in the last 10 years is likely to have a wide band receiver that will works over a range of ~1260nm to ~1620nm. This means that a card that transmits at 1310nm will more than likely receive a 15xx.xxnm signal that has been converted for DWDM applications or 1491nm for CWDM applications.
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