William Herrin wrote:
PON (e.g. FIOS) is similar to CWDM.
If you are not talking about WDM PON, no, not at all.
The PO in PON is Passive Optical. As in a glass prism-like device with no electronics.
The passive optical device of usual PON is not a prism but a splitter. The entire optics is shared by all the subscribers sharing a fiber. Thus, the problem is collision avoidance of simultaneous transmission, which makes PON time shared with L2 protocols.
So, you share fiber by having one guy control one wavelength (color, e.g. red) and another guy control another wavelength (e.g. blue).
That's not a usual PON but WDN PON.
Or, you could share at a different level: ethernet packets.
That's where usual PON can be shared. But, it costs a lot, as much as sharing at L3. Masataka Ohta