Research Paper On Visible Light Communication

They are generally being replaced with energy-efficient alternatives, such as fluorescent lights, compact fluorescents and LEDs.Though the core logic behind such a policy would appear sound to most individuals, this drive has met with resistance in certain quarters due to perceived doubts about the ecological suitability of some of the proposed alternatives, particularly fluorescent and compact fluorescent lamp units - .An additional incentive at present is that, whilst free usage of radiowave and microwave wireless communications is restricted by law, VLC technologies do not, as yet, require licenses.

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To date the Infrared Data Association (Ir DA) has standardised over 30 specifications that are widely implemented for cordless phones, printers, televisions and other devices.

Its 2008 market-report indicated a prolific increase of Ir DA infrared enabled devices, of which over 1 billion units have been shipped to date, and that demand for such units was likely to increase greatly, particularly with the development of Ir Simple version 1.0 and technological advances used for Giga-IR.

Their use may help provide both partial and full solutions to a number of technological problems: increasingly limited availability of conventional bandwidths for electronic equipment; possible communications interference with sensitive electrical equipment; data security; and perceived negative health consequences when exposed to raised radiofrequency and microwave levels.

The incorporation of VLC components into everyday technology is being investigated by a number of universities, corporations and organisations worldwide, and has already resulted in the creation of the Japan Electronics and Information Technology Industries Association’s JEITA standards (2007) for a “visible light ID system”, and a Specification Standard in 2008 by the Visible Light Communications Consortium (VLCC) - as a result of its joint cooperative agreement with the Infrared Data Association (Ir DA).

2010: The Center for Ubiquitous Communication by Light (UC-Light) at the University of California seeks to develop VLC technology further to allow communication between a wide variety of electronic products, such as high definition televisions, information kiosks, personal computers (PCs), personal digital assistants (PDAs) and smartphones.

2009: A result of the joint cooperative agreement between VLCC and the Ir DA, VLCC issue their first Specification Standard which incorporates and expands upon core Ir DA specification and defined spectrum to allow for the use of visible light wavelengths.If it is developed correctly, the possibility exists that many of the problems associated with present day infrared, radiowave and microwave communications systems () could be at least partially resolved, and a more biologically friendly system made available to industries and the general public.A further advantage is that VLC systems can transmit data more securely over short distances than radiofrequency/microwave communications devices whose signals can be easily detected outside the rooms and buildings they originate in.LED (Light Emitting Diode) VLC technology LED (Light Emitting Diode) Visible Light Communications (VLC) systems are recognised as creating a possible valuable addition to future generations of technology, which have the potential to utilise light for the purposes of advanced technological communication at ultra high speed surpassing that of current wireless systems.One of the goals of researchers is to allow 100 megabits of data transference per second (Mbps) in offices and homes by modulation of light from upgraded lighting systems.As noted by the Visible Light Communications Consortium (VLCC) which was formed in Japan in 2003 (and includes amongst its members Casio, NEC Corporation, Panasonic, Samsung, Sharp and Toshiba), “…visible light communication has characteristics to be ubiquitous, transmitted at ultra high speed and harmless for human body and electronic devices, compared to [emissions] by radio and infrared communications.” Such factors indicate that there is a strong need to ensure that VLC are at least as biologically friendly as the units they are designed to replace or supplement, and that they may offer a more sophisticated solution to the communications technology than is presently available.The same researchers were also able to demonstrate that a system using up to 5 LEDs could transfer data over greater distances at 100 Mbps with direct line of sight.Reduced levels of transmission would have occurred using diffused light from walls outside of line of sight.Whilst visible light from LED systems and infrared emissions share similar frequency ranges, it is acknowledged that there are potential visual safety problems with using infrared for high rates of data transmission due to both the large energy emissions it would create and its invisibility, making suitably developed LED light data transmission a safer option for human eyes.Radiofrequency/Microwave Communications At present the multiple use in buildings of the three independent WLAN frequency bands can often compromise information networks.


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