IIT Guwahati develops free space optical communication system

New Delhi :
Indian Institute of Technology, Guwahati (IIT Guwahati) in collaboration with Abhyapuri College, Assam has developed a free space optical communication system. A research team led by the Dr. Bosanta Ranjan Boruah of IIT Guwahati & Dr. Santanu Konwar of Abhayapuri College, Assam, has developed a novel free-space optical communication system for information transfer.

Image is transmitted using light wirelessly –

The research team has demonstrated the distortion-free transmission of text messages and images over a distance of one kilometer even in the presence of turbulence such as during a stormy weather. In free-space communication, data in the form of voice, text or image is transmitted using light wirelessly rather than through optical fibers and it represents the next generation of communications technology. The past couple of decades have seen phenomenal developments in free-space communication. Most free-space communication systems developed so far all over the world use a type of light beam called the vortex beam to encode the data.

Used orthogonal spatial light modes –

The problem in the use of a vortex beam is that it can be distorted by turbulence that may occur in the medium of propagation. In effect, data transmitted wirelessly using light/laser beams, can become corrupted when transmitted through atmospheric turbulence such as wind. To overcome this problem, the IIT Guwahati researchers have, for the first time, used orthogonal spatial light modes called Zernike modes to encode the data and to transmit the same robustly in the form of the phase profile of a laser beam.

IIT Guwahati says –

Explaining the technicality of the research, Dr. Bosanta Ranjan Boruah, Department of Physics, IIT Guwahati says, “In our work, the transmission station modulates the phase profile of a laser beam that carries the data, in terms of the strengths of a few Zernike modes. In the process we also enhance the information content per modulation cycle of the laser beam.”

A unique mechanism has been implemented –

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. In this communication system, a unique mechanism has been implemented that can compensate for the effect of atmospheric turbulence, so that the user information can be transmitted even through turbulent atmosphere resulting in negligible error at the receiving station.

Transmitted beam by measuring the phase –

“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, with prior knowledge about the strength and types of Zernike modes used, which make it more secure than wired and other conventional wireless forms of communication”, says Dr. Santanu Konwar, presently an Assistant Professor at the Department of Physics, Abhayapuri College, Assam.

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