To replace the copper-based networks with fiber optics appears to be a trend of nowaday network infrastructure. At the same time, the development of Passive Optical Network (PON) technology definitely offers a more cost-effective and more safe solution of fiber optics cabling. These new technologies naturally change the game in enterprise networks. Fiber-based passive optical LAN (POL), as a particularly promising alternative for enterprises in need of a secure, converged network with increased bandwidth, has emerged to satisfy the demands of many enterprise networks.
POL, short for passive optical local area network, is a Layer-2 transport medium, built with passive optical network (PON) technology, which provides converged data, video, and voice services at Gigabit speeds over a single strand of fiber to the user’s location. POL is more environment-friendly than the traditional copper-based Ethernet LAN and it uses standard FTTh(Fiber to the home) architecture and protocols that are quite different from typical LAN. Compared with the traditional LAN, POL is a more cost-effective and energy efficient alternative as it uses a different architecture with single-mode fiber that makes the user and electronic devices become more closer than the traditional LAN, eliminating distance constraints and reducing the quantity of cable to the workstations. In addition, with its “passive” and “optical” features, it uses less energy and consumes far less space and raw materials compared to copper cabling. Moreover, since the ONTs can support multiple devices, the POL can save the cost of cables and labor. This is why it is also called “green” network.
Similarly with PON, there’s no need for active electronics between the main equipment room and the work areas. A typical POL consists of optical line terminal (OLT), optical splitter and optical network terminals (ONTs) to transmit voice, video and data throughout the network (Figure 1). POL uses internationally standardized systems called Gigabit PON (GPON) or Ethernet PON (EPON), but now GPON seems to be more popular, as GPON can offer higher performance and coexist with the legacy PON systems.
Figure 1. The Composition of POL
A POL solution needs nothing but passive components. Instead of using workgroup switches, the POL solution uses optical splitters which are the most important passive component of a POL system. Downstream, the splitter splits the signals to all the devices and upstream it combines them into one fiber, allowing bidirectional signals on one single-mode fiber. As shown in the following diagram (Figure 2. a typical POL diagram), signals are transmitted downstream at 1490nm and upstream at 1310nm. Downstream the splitter “splits” the signal for up to 32 ONT connections on only a single fiber each while upstream it “combines” the signals from the 32 ONTs onto the single fiber connecting the splitter to the OLT.
Figure 2. A Typical POL Diagram
Without using electricity, optical splitters distribute converged services directly from main switch to the terminals that can achieve the maximum utilization of a single optical fiber cable and reduce power consumption at the same time. As the technology is becoming more and more mature, nowadays optical splitters (Figure 3.) can be designed as 64 outputs which greatly improves the utilization of optical fiber. To a certain extent, many IT techs consider the PON splitter to serve the same purpose as a switch but require no power / ground / AC(Alternating Current). And since there is no need for rack-mounted switches, it only takes a fraction of the space.
Figure 3. Nowadays Commonly Used Optical Splitters
POL is environment-friendly, less costly, easier to install and easier to maintain as well as more secure than legacy Ethernet networks. It is currently receiving increasing attention of people. Why many enterprises can’t afford to ignore POL? The following points will answer your question.
The POL offers the enterprise a more robust and durable alternative than copper structured cabling solutions, and it can help enterprises meet their network demands now and even for decades to come. POL can dramatically reduce both the installation and operating costs of your in-building Local Area Network (LAN). Using optical splitters and optical network terminals instead of access switches, POL provides connectivity to and throughout each floor of a building with low power consumption. It also enables a tremendous amount of network traffic over a reduced-footprint, lightweight optical cabling infrastructure and eliminates the electronics typically deployed at the access layer in traditional copper-based in-building networks. This is why POL is becoming more and more popular. According to a new market report published by Transparency Market Research, the global POL market is expected to reach USD 33.88 billion in 2020. We believe that POL will be more cost-effective and become more widely used by enterprises, govertments, campus etc., as the technology and passive optical component products market are becoming more and more mature in the next few years.
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