Passive Optical Networks

Task Force (IETF) have also invested many efforts to make Ethernet more

manageable and suitable for end-to-end service delivery.

1.1.5 WDM in Optical Access Networks

Wavelength division multiplexing (WDM) increases system capacity by trans-

mitting multiple wavelengths on a single fiber. Coarse WDM techniques have

already been applied in PON systems to separate upstream and downstream

signals, and provide analog video overlay [16]. An important advantage of the

optical fiber is its virtually unlimited bandwidth from an access viewpoint.

Coarse WDM overlay on a power-splitting PON is an obvious way to provide

different services and increase system capacity. For example, one can segregate

the optical spectrum into different coarse WDM bands and engineer ...