Mostly Cloudy
0°CSun :Mostly Clear. High: 5 Low: -2

New fibre optic technology can boost Internet bandwidth

New fibre optic technology can boost Internet bandwidth

Washington: 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.

 

Top Stories

jaitley

Arun Jaitley says govt resolved to changes; cautions obstructionists

December-20-2014
New Delhi: Finance pastor Arun Jaitley on Saturday said definitive approach making will be key to maintain the believability of the Indian
SBI_5_0_0_0_0_0_0_0

SBI opens 385 digital technology learning centres across the country

December-20-2014
State Bank of India (SBI) has dispatched SBI’s 385 advanced innovation learning focuses the nation over to cover 15,000 clients of the
Amit-pardaphash-166288

Amit Shah takes a burrow at Rahul Gandhi, says he is wearing Italian glasses

December-20-2014
New Delhi: Bharatiya Janata Party president Amit Shah on Friday took a burrow at Congress’ VP Rahul Gandhi and said that he
304895-khabragade700

Devyani Khobragade stripped of her obligations, put on ‘obligatory hold up’

December-20-2014
New Delhi: The administration has peeled off representative Devyani Khobragade from her obligations in the Ministry of External Affairs, days after she
Dimpy-Pretam

Bigg Boss 8 Breaking With Salman Khan: Dimpy And Pritam’s Ugly Fight

December-19-2014
Bigg Boss 8 the most questionable reality show. Presently at the Bigg Boss 8 house, there is another assignment. In this errand
Anushka-Sharma-in-Police-Avatar-in-The-New-Motion-Poster-of-P.K.

“PK” (Peekay) – Movie Review: Aamir Khan-Anushka Sharma’s Chemistry Impresses Viewers

December-19-2014
Rajkumar Hirani’s “PK” (Peekay), which is the last exceptionally anticipated Bollywood film of 2014, has discharged in theaters in the global markets