Press Esc to close
Friday 26 August 2016
News updated at 2:15 AM IST
Weather
Max: 29.3°C
Min : 20.8°C
In Bengaluru
Sunny day

New fibre optic technology can boost Internet bandwidth

Washington, June 28, 2013, (PTI)
Reuters File Image.

In a breakthrough, scientists, including one of Indian-origin, have devised a new fibre optic technology that promises to increase bandwidth dramatically, easing Internet congestion and video streaming.

The technology centers on donut-shaped laser light beams called optical vortices, in which the light twists like a tornado as it moves along the beam path, rather than in a straight line.

Widely studied in molecular biology, atomic physics and quantum optics, optical vortices (also known as orbital angular momentum, or OAM, beams) were thought to be unstable in fibre, until Boston University Engineering Professor Siddharth Ramachandran recently designed an optical fibre that can propagate them.

In the paper in journal Science, he and Alan Willner of University of Southern California, demonstrated the stability of the beams in optical fibre and also their potential to boost Internet bandwidth.

"For several decades since optical fibres were deployed, the conventional assumption has been that OAM-carrying beams are inherently unstable in fibres," said Ramachandran.

"Our discovery, of design classes in which they are stable, has profound implications for a variety of scientific and technological fields that have exploited the unique properties of OAM-carrying light, including the use of such beams for enhancing data capacity in fibres," he said.

Ramachandran and Willner collaborated with OFS-Fitel, a fibre optics company in Denmark, and Tel Aviv University.

Traditionally, bandwidth has been enhanced by increasing the number of colours, or wavelengths of data-carrying laser signals - essentially streams of 1s and 0s - sent down an optical fibre, where the signals are processed according to colour.

An emerging strategy to boost bandwidth is to send the light through a fibre along distinctive paths, or modes, each carrying a cache of data from one end of the fibre to the other.

Unlike the colours, however, data streams of 1s and 0s from different modes mix together; determining which data stream came from which source requires computationally intensive and energy-hungry digital signal processing algorithms.

Ramachandran's and Willner's approach combines both strategies, packing several colours into each mode, and using multiple modes.

In experiments in the study, researchers created an OAM fibre with four modes (an optical fibre typically has two), and showed that for each OAM mode, they could send data through a one-kilometre fibre in 10 different colours, resulting in a transmission capacity of 1.6 terabits per second.


Go to Top

Photo Gallery
Children dressed Radha Krishna on the occasion of Sri Krishna Janmashtami celebrations...

Children dressed Radha Krishna on the occasion of Sri Krishna Janmashtami celebrations...

Renowned artist Partha Das hands over a potrait of Mother Teresa to Sister Lysa...

Renowned artist Partha Das hands over a potrait of Mother Teresa to Sister Lysa...

Sarbananda Sonowal feeding baby elephants rescued during the recent floods at Wildlife...

Sarbananda Sonowal feeding baby elephants rescued during the recent floods at Wildlife...

Members of AISA and JNUSU shout slogans during their protest in connection of JNU rape case...

Members of AISA and JNUSU shout slogans during their protest in connection of JNU rape case...

Devotees form a human pyramid to celebrate the festival of Janmashtami, marking the birth...

Devotees form a human pyramid to celebrate the festival of Janmashtami, marking the birth...

A devotee performs prayers at a Lord Shiva temple submerged in flood water of Ganga River...

A devotee performs prayers at a Lord Shiva temple submerged in flood water of Ganga River...

An aerial view of a flooded area in Allahabad on Thursday...

An aerial view of a flooded area in Allahabad on Thursday...

A view of lighting at Sri Krishna Janamsthan temple during Sri Krishna Janmashtami festiva...

A view of lighting at Sri Krishna Janamsthan temple during Sri Krishna Janmashtami festiva...

Muslim women carrying their children dressed up as Lord Krishna and Radha for a program...

Muslim women carrying their children dressed up as Lord Krishna and Radha for a program...

Bollywood actress Sonakshi Sinha at a press conference to promote her upcoming film in Jaipur...

Bollywood actress Sonakshi Sinha at a press conference to promote her upcoming film in Jaipur...

Copyright 2014, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523