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High Speed and Bandwidth with Passive Optical Networks

Tuesday, 07 July 2009

"Passive optical network is the technology of choice for many operators to roll out high speed broadband services."

We, as a service provider rely on optical fiber network for both access networks (customer distribution). We have an extensive fiber based metro area network in all the major cities in India for providing IP metro ethernet connectivity to our customers. As of date we rely on the single mode fiber (G.652D) for our metro area network deployments and a typical segment length of the fiber cable between our metro POP's would be 5 to 15 kms and the length of the fiber cable from the metro POP to the customer location would be 1 to 5 kms. We typically have ring architecture between our metro POP's for protection.

We are committed to enhancing the terrestrial access network using optical fiber to provide the flexibility of pure ethernet based access to our customers. A terrestrial access network conforming to ethernet based access over OFC would provide the high speed access data / voice / video converged network to our customers and also provide the flexibility to upgrade their bandwidth as and when required on demand. We are looking at new cutting edge technologies that would provide us an easy and convenient method to access the customer building / homes on fiber with least amount of active components (powered equipments) in the outside plant. Gigabit ethernet passive optical network (GEPON) is one such technology that provides a passive optical network distribution.

Passive Optical Networking

PON (GPON and GEPON) is the technology of choice for many operators to roll out high speed broadband services. The gigabit ethernet passive optical network (GEPON) consists of optical line termination (OLT) system and a set of associated optical network units (ONU) to construct a broadband access network between central office and customer premises. It is based on IEEE 802.3ah standard. It offers max speed of up to 1 Gbps per user (up to 20kms) based on EPON standard. While subscribers are connected via dedicated distribution fibers to the site, they share the optical distribution network (ODN) trunk fiber back to the central office.

Our plan is to implement GEPON based access network in major cities for providing high bandwidth connectivity to enterprise, SME and residential customers. GEPON access network has following advantages:

Very high speed data up to 1 Gbit/s to home
Lower maintenance costs due to passive network between central office and customers
Low cost due to fiber and OLT interface shared by several customers
Longer reach than copper
Constant data rate regardless of reach or distance
Multiple applications including data (IP), video and voice (triple play)
Digital and analog capable
Cost-competitive with low-bandwidth copper networks
Future proof'there are no active field electronics to replace when upgrading

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