PONs provide lower-cost fiber connectivity using passive splitters to share infrastructure among multiple customers. Key elements include passive splitters and couplers to distribute light without power. PONs topologies employ a central splitter to fork fiber to multiple customer sites. Ethernet PONs replace expensive SONET and ATM components with Ethernet over passive fiber splitters. Metro optical networks use extensive fiber rings for distribution with robust OAM capabilities.

1. BY :
HUSSEIN TUAMA
PONs
&
Metro optical networking

2. Contents
Definitions
PONs advantages
PONs Elements
PONs Topology
PONs & Ethernet
Metro Optical Networking

3. Definitions
PONs :passive optical networks are really not passive
!!
Why called passive ??
-no electronics to power components
that’s mean :
no amplifiers ,rectifiers and of course no batteries .

4. PONs advantages
shared infrastructure translates to lower cost per
customer
minimal number of optical transceivers
passive splitters translate to lower cost
can be installed anywhere
no power needed
fiber data-rates can be upgraded as technology
improves

5. PONs Elements
Passive Power Coupler/Splitter: Number of
input/output ports and the power is split in different ratios.
Star Coupler: Splits the incoming power into number of
outputs in a star network
Add/Drop Bus Coupler: Add or drop light wave to/from
an optical bus
All Optical Switch: Divert the incoming light wave into a
particular output

6. PONs Topology
PONs topology is shown in next figure ,in which
fiber can be forked out to multiple sites with the
use of splitters .
This approach saves a lot of money by multiplexing
many user payloads on few fibers than in
conventional point to point topology .
PONs employs ATM to give efficient bandwidth
management .

7. PONs

8. Ethernet PONs
 The use of Ethernet and PON technology in the local loop
reduces the cost of providing high capacity links to the
customer
 The reason is that the expensive components such as
SONET ADM ,and ATM switches can be eliminated ,and
replaced with less expensive components as shown in figure
 Point to point topology used in Ethernet PON and as we
learned can be split into multiple fibers with splitter .

9. Conventional ATM/SONET and PON configurations

10. Metro Optical Networking
Metro network deployed fiber in a distribution plant.
Its extensive operation , administration and
maintenance (OAM) capabilities make it an effective
technology for the service providers
The most common approach topology for metro
optical network is to employ RINGs

11. Metro Optical networking