Passive Optical Networks

A TDM-PON uses a passive power splitter as the remote terminal. The same

signal from the OLT is broadcast to different ONUs by the power splitter.

Signals for different ONUs are multiplexed in the time domain. ONUs recognize

their own data through the address labels embedded in the signal. Most of the

commercial PONs (including BPON, G-PON, and EPON) fall into this category.

A WDM-PON uses a passive WDM coupler as the remote terminal. Signals

for different ONUs are carried on different wavelengths and routed by the

WDM coupler to the proper ONU. Since each ONU only receives its own

wavelength, WDM-PON has better privacy and better scalability. However, ...