GUWAHATI: Researchers at the Indian Institute of Technology, Guwahati (IIT-G), have developed an advanced free-space communication system using light beams for error-free data transmission. Moreover, this mode of communication is also protected from hackers.
In free-space communication, data, in the form of voice, text or image, is transmitted using light beams rather than optical fibres. A research team, led by IIT-G faculty Dr Bosanta Ranjan Boruah from the physics department and Dr Santanu Konwar, assistant professor at the physics department of AbhayapuriCollege in Assam, has developed the novel free-space optical communication system for information transfer.
It is a one-to-one line-of-sight communication that is free from the distorting effects of atmospheric turbulence. The results of this research have been published in “Communications Physics”, a statement by IIT-G read on Monday.
Explaining the research, Dr Boruah said, “Through our tech, the transmission station modulates the phase profile of a laser beam that carries the data. In the process, we also enhance the information content per modulation cycle of the laser beam.” At the point of reception, the laser beam, with encoded user information, is sensed by a specially designed wavefront sensor that decodes the user information.
IIT-G stated that in this communication system, a unique mechanism has been implemented that can compensate for the effect of atmospheric turbulence so that user information can be transmitted even through turbulent atmospheric conditions resulting in negligible error at the receiving station.
Dr Konwar explained, “In addition to eliminating errors in communication, our system is also insulated from hacking and interloping because the receiver decodes the transmitted beam by measuring the phase and not the power of the light beam which make it more secure than wired and other conventional wireless forms of communication.”
The transmission is directed strictly towards the receiver, unlike other wireless forms of communication in which the information is transmitted in all directions, adding to security lapses. The research team has demonstrated the distortion-free transmission of text messages and images over a distance of one kilometre even in the presence of turbulence such as during a stormy weather. In order to protect it from turbulences, such as wind noise, the researchers have, for the first time, used orthogonal spatial light modes called Zernike modes to encode the data.
Source From : Times Of India