25 C
Guwahati
Wednesday, April 21, 2021
More

    IIT Guwahati scientists develop advanced free-space communication system

    Researchers have, for the first time, used orthogonal spatial light modes called Zernike modes to encode the data and to transmit the same

    GUWAHATI: A research team led by IIT Guwahati faculty, Dr Bosanta Ranjan Boruah, Department of Physics, IIT Guwahati, and Dr Santanu Konwar, presently an Assistant Professor at the Department of Physics, Abhayapuri College, Assam, has developed a novel free-space optical communication system for information transfer.

    In free-space communication, data in the form of voice, text or image is transmitted using light wirelessly rather than through optical fibres and it represents the next generation of communications technology.

    The results of this pathbreaking work have recently been published in “Communications Physics (https://www.nature.com/articles/s42005-020-00468-1)” a highly reputed journal belonging to Nature Publishing Group.

    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. The problem is 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.

    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.”

    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.

    “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. Furthermore, 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 the security of the communication.

    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 stormy weather. The communication system can thus be used for high speed and secured communication between two individuals located either inside a building or outside.

    Published:

    Follow TIME8.IN on TWITTER, INSTAGRAM, FACEBOOK and on YOUTUBE to stay in the know with what’s happening in the world around you – in real time

    First published

    TRENDING

    Section 144 clamped in Shillong; Shops and Markets to remain close on Sundays

    After Assam, the East Khasi Hills district in Meghalaya has imposed some restrictions amid the COVID 19 scare in the state

    Assam MP’s nephew passes away; suicide suspected

    Kaushik Oja, also the nephew of Guwahati Lok Sabha MP Queen Oja, allegedly died by suicide in the wee hours of Thursday.

    Covid19 Scare: Assam Govt yet to decide on holding Board exams

    The total active COVID-19 cases in Assam now stand to 3,200 with 1,122 death cases

    No Covid scare at Gauhati University! PG 1st semester exams to be held as per schedule

    A second phase of the examination may be conducted for the students who are not able to appear in the examinations at a convenient time: GU

    Two murders marred Bihu festivities in Assam

    A man hacked his father to death over some family dispute in Dhubri

    97 fresh COVID-19 positive cases traced in Meghalaya, Active rises to 457

    East Khasi Hills is the worst affected district with 360 active cases

    Meghalaya Govt prohibits smoking and spitting in public places; Fine upto Rs 1000

    The decision was taken as per the provisions of sections 51-60 of the Disaster Management Act 2005 and section 188 of the Indian Penal Code