Polymer Optical Fiber (POF) for In-House-Networks using Lower Girth Transmission System

The Plastic Optical Fiber strives to actively promote the proliferation of Polymer Optical Fiber (POF) systems serving both data communication and non-data markets. Single mode silica optical fiber has already established as undisputable position in core telecommunication networks and has reached Tbits/s throughputs. When optical fiber approaches the user's residence, even enters his home, the costs of installing and maintain become even more important. The Use of POF will be an attractive solution for future broadband CPN. Present systems work with 650 nm sources. In This Research I have proposed the use of 520 nm InGaN LED and will show advantages and open problems. The paper will present the present status of POF systems, based on 650 nm components. The ATM Forum specifies a link with a capacity of 155 Mbps and 50 m reach. For a number of applications it would be helpful to improve this system in the direction of a longer reach and/or more system margin in the power budget. Introduction Optical fiber is gradually penetrating towards the end user, driven by his needs for more capacity that is fueled by appliances online fast internet application, communication and interactive services including both audio and video[1]. Single mode silica optical fiber has already established as undisputable position in core telecommunication networks and has reached Tbits/s throughputs [2]. When optical fiber approaches the user's residence, even enters his home, the costs of installing and maintain become even more important. In comparison with single mode optical fiber, Polymer Optical Fiber (POF) is much easier to handle and to install due to its large core and its ductility. Multimode polymer optical fiber (POF) has emerged as very attractive medium for easy to install in-house telecommunication networks [3]. The distinct advantages of POF over fixed wiring media such as copper cable and wireless technologies are more bandwidth and lower losses with complete signal format and protocols with QoS. However more attenuation and lower bandwidth has been observed due to higher dispersion as compared to single mode silica fiber [4]. In-house, there presently is a wide variety of networks, each optimized for transporting a particular set of services (such as CATV, voice telephony, high-speed data, etc.). The lack of a common network infrastructure hampers the introduction of new services, and the creation of mutual relations between the services [5]. Optical fibre may open the way towards such a common network. In particular, multimode fibre is attractive because it is easy to install due to its large core diameter, and it is already widely accepted for short-range data communications in broadband LANs, benefiting from low-cost transceiver modules. Moreover, multimode Polymer Optical Fibre (POF) offers large flexibility and ductility, which further reduces installation costs in often less accessible customer locations. Its attenuation per unit length is being reduced steadily, as production technology improves; presently, losses below 10 dB/km have been obtained [6]. However, the limited bandwidth of multimode fibre due to its large multimodal dispersion still complicates the integration of multiple broadband services. In this paper, mode group diversity multiplexing is proposed as an alternative approach for service multiplexing without putting high requirements on the fiber's bandwidth. Multiple groups of modes in a highly multimode fibre network are being used in parallel, in order to host independently multiple sets of services [7]. Thus in a single in-home network e.g. broadband user terminals with fixed-wire connections (such as Gigabit Ethernet) may be supported, as well as broadband wireless terminals (such as in a wireless LAN) A high number of residential and small business users will be connected to new broadband telecommunication networks as HFC, xDSL or broadband radio/satellite in the next years. A very important requirement for the success of these new networks will be the availability of low cost, simple to use and to install, broadband In-House-Network solutions [8]. Besides the well known copper based solutions, the use of Polymer Optical Fibres (POF) can be very attractive. The advantages of POF in comparison to twisted pair copper cables are the small cable diameter, the easy installation and the immunity against electromagnetic fields [9]. The paper will present the present status of POF systems, based on 650 nm components. The ATM Forum specifies a link with a capacity of 155 Mbps and 50 m reach. For a number of applications it would be helpful to improve this system in the direction of a longer reach and/or more system margin in the power budget. Status of POF systems using 650 nm sources Sources for POF transmitters include LEDs, laser diodes, resonant cavity LEDs (RC-LEDs), and VCSELs. LEDs Computer Engineering and Intelligent Systems www.iiste.org ISSN 2222-1719 (Paper) ISSN 2222-2863 (Online)