IIT-Guwahati (IIT-G): Researchers at the Indian Institute of Technology, Guwahati have developed a technology of an advanced free-space communication system utilizing the beam of lights for error-free data transmission. Furthermore, this system of communication is also safeguarded from hackers.
The futuristic free-space optical communication system for information transmission is developed at the Indian Institute of Technology, Guwahati by a team of researchers, headed by IIT-G faculty Dr. Bosanta Ranjan Boruah from the physics department and Dr. Santanu Konwar, an assistant professor from the Physics department of Abhayapuri College in Assam.
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Data in the form of image, text, or voice is sent out utilizing light beams instead of optical fibres in free-space communication. It is a one-to-one line of sight communication that is unrestrained from the distorting effect of atmospheric turbulence.
A statement from IIT Guwahati was released on November 23, that outcomes of this research have been published in “Communication Physics”.
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Dr. Baruah elaborating the research stated that the transmission station through their technology modulates the phase profile of a laser that conveys the data and during the process, they also enhance the information content per modulation cycle of the laser beam.
At the receiving end, the laser beam carrying the encoded user information is sensed by a specially designed wavefront sensor that decodes the user information.
IIT Guwahati informed that in this technology, a unique mechanism has been applied that can compensate for the atmospheric turbulence effect so that the user information can be transferred even in case of turbulent atmospheric circumstances resulting in trivial error at the point of reception.
Konwar said that their system besides eliminating errors is also protected from interloping and hacking because the recipient decodes the transferred beam by measuring the phase and not the power of the light beam that makes it safer than wired and other regular wireless ways of communication.
Unlike various forms of communication in which the information is transferred in all directions, this transmission technology is directed solely towards the receiving end that adds to the security lapses.
The IIT-G researchers’ team has also demonstrated the transmission of text messages and images without any distortion, over a distance of one kilometer even in the presence of turbulence such as during stormy weather.
In order to shield the technology from turbulences, such as wind noises, the researchers have used orthogonal spatial light modes called Zernike modes to encode the data, for the first time.
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