The increasing demands for brand spanking new data transmission services and various bandwidth-related applications have led telecommunication operators to significantly consider glass fiber based networks. Enabling faster computer connectivity, fiber to the home (FTTH) seems to be a perfect option to meet those demands within the end of the day .
FTTH, a sort of fiber-optic communication delivery, refers to the installation and use of glass fiber from a central point on to individual buildings. In FTTH network, fiber reaches the boundary of the lebensraum , sort of a box on the surface wall of a home. FTTH network makes low attenuation and great bandwidth over single-mode fibers possible. There are two main technical approaches for FTTH network: active optical network (AON) and passive optical network (PON). This post mainly talks about FTTH access network supported Gigabit passive optical network (GPON) which may be a sort of PON.
Introduction to GPON-Based FTTH Access Network
GPON is defined by ITU-T recommendation series G.984.1 through G.984.6. it’s built on a series of technology enhancements that reach and improve on earlier sorts of PON. Like its predecessors, GPON may be a point-to-multipoint technology during which one optical port (optical line terminal, OLT) communicates with multiple subscriber devices (optical network terminal, ONT) over common glass fiber by means of an optical splitter. In GPON-based FTTH access network, the unpowered optical splitters are wont to enable one glass fiber to serve multiple premises, typically 64-128.
Components of GPON-Based FTTH Access Network
There are three main components in GPON-based FTTH access network: a headquarters node, called an OLT, one or more user nodes, called optical network units (ONUs) or ONTs, and optical splitters. An OLT is typically placed within the Local Exchange and it’s the engine that drives FTTH system. The important functions of an OLT are traffic scheduling, buffer control and bandwidth allocation. ONTs are deployed at customer’s premises. they’re connected to the OLT by means of glass fiber and no active elements are present within the link. An optical splitter, also called PON splitter, is employed to separate the facility of the signal. Usually, an optical splitter is in a position to widen operating wavelength range and support network survivability and protection policy. the subsequent image shows the GPON design.
GPON is chosen for FTTH access network due to its following features and advantages.
Since GPON takes advantages of optical wavelength division multiplexing (WDM), one fiber are often used for both upstream and downstream data transmission. Upstream data transmits on a wavelength of 1310nm with a speed up to 1.25 Gbps. Downstream data transmits on a wavelength of 1490nm with a speed up to 2.5 Gbps. Thus, great bandwidth is delivered by GPON. Besides, fiber split ratios in GPON network can sometimes reach up to 1:128. that’s to mention the above-mentioned great bandwidth are often delivered to potential 128 subscribers.
More importantly, the value associated with the upkeep of PON system could also be low, as there’s little chance that the passive parts deployed in GPON infrastructure will broke down or fail during their operation. Besides, the GPON design may be a tree topology so as to maximise their coverage with minimum network splits, thus reducing optical power.
FTTH network supported GPON can provide cost-effective solutions for the longer term bandwidth demands, like TV and video services, online games and VoIP (Voice over Internet Protocol). Fiberstore’s GPON ONTs, OLTs and optical splitters are all of top quality with high-performance. you’ll visit BT-PON for more information about GPON FTTH solutions.