Monday, Nov 23 2020 | Time 20:43 Hrs(IST)
image
  • AP govt failed in achieving industrial development: Lokesh
  • Brick kiln owner from Thane arrested along with 2 others for kidnapping & beating tribal
  • BCCI mourns death of former Kerala cricketer CK Bhaskaran Nair
  • Four of a family commit suicide in AP
  • India, EU hold consultations on disarmament, non-proliferation matters
  • Samsung to invest Rs 5000 cr in Noida plant
  • COVID: Bangladesh reports 2,419 new cases, 28 deaths
  • Dhankhar expresses concern over alleged reports of corruption by public servants of Mamata Govt
  • Mortal remains of first lady of Odisha consigned to flames at Swargadwar
  • Assam’s longest serving CM Tarun Gogoi dead; three day state mourning announced
  • Relaxation norms on merger of schools also applicable in KBK districts: Minister
  • Women's bodies protest rising crimes against women in Bihar
  • 58 new COVID-19 cases detected, 57 recoveries in Meghalaya
  • Prez urges people to rededicate themselves for selfless service of others
States » EastPosted at: Nov 23 2020 6:01PM


IIT Guwahati scientists develop advanced free space communication system for error free data transmission

Guwahati, Nov 23 (UNI) A research team led by IIT Guwahati faculty, Dr. Bosanta Ranjan
Boruah, Department of Physics, and Dr. Santanu Konwar, 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 work have recently been published in “Communications Physics (https://www.nature.com/articles/s42005-020-00468-1)”, a reputed journal belonging to
Nature Publishing Group.
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.
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.
Explaining the technicality of the research, Dr. Boruah said, “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”, Dr. Konwar said.
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 a stormy weather.
UNI SG BM
Tags: #IIT Guwahati scientists develop advanced free space communication system for error free data transmission
More News

CM Biren condoles death of Tarun Gogoi

23 Nov 2020 | 8:31 PM

Imphal, Nov 23 (UNI) Chief Minister N Biren Singh expressed deep shock and offered
heartfelt condolences on the sudden demise of Tarun Gogoi, a veteran politician and the
former Chief Minister of Assam.

see more..

Depression in Bay of Bengal to intensify into a cyclonic storm “Nivar”: Met

23 Nov 2020 | 8:18 PM

Bhubaneswar, Nov 23 (UNI) The Well Marked low pressure area formed over Southwest
adjoining southeast Bay of Bengal yesterday concentrated into a depression today.

see more..

Mortal remains of first lady of Odisha consigned to flames at Swargadwar

23 Nov 2020 | 8:11 PM

Puri, Nov 23 (UNI) The mortal remains of Sushils Devi, the First Lady of Odisha were
consigned to flames at Swargadwar burning ghat with state honours this noon.

see more..

Odisha Guv appoints six new vice chancellors

23 Nov 2020 | 8:09 PM

Bhubaneswar, Nov 23 (UNI) Odisha Governor and Chancellor of Universities, Odisha
Professor Ganeshi Lal today appointed new Vice Chancellors for six universities of the
state.

see more..

Assam’s longest serving CM Tarun Gogoi dead; three day state mourning announced

23 Nov 2020 | 8:07 PM

Guwahati, Nov 23 (UNI) Assam’s longest serving chief minister and veteran Congressman
Tarun Gogoi, who had been suffering from post-COVID complications after contracting the
virus in August, died of multiple-organ failure in the ICU of Gauhati Medical College and
Hospital (GMCH) here today.

see more..
image