BY:

HUSSEIN TUAMA

PONs &

Metro optical networking

Contents

Definitions PONs advantages PONs Elements PONs Topology PONs & Ethernet Metro Optical Networking

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 .

PONs advantages

shared infrastructure translates to lower cost per customer

minimal number of optical transceiverspassive splitters translate to lower costcan be installed anywhereno power neededfiber data-rates can be upgraded as

technology improves

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

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 .

PONs

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 .

Conventional ATM/SONET and PON configurations

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

Metro Optical networking