Anti-resonant hollow core optical fiber reduces ‘noise’

Rochester researchers document an optical fiber beyond comparison

The anti-resonant hollow core fiber has a unique arrangement of seven hollow capillaries arranged around the hollow core inside the fiber. Credit: Arjun Iyer / Renninger Lab / University of Rochester

A new hollow optical fiber reduces “noise” to a great extent, interfering with signals that are now more widely used than single-mode fibers, researchers at the University of Rochester reported.

The anti-resonant hollow-core fiber, made by researchers at the University of Central Florida, produces a thousand times less “noise” than disruption caused by acoustic phones arising from glass in the fiber at room temperature. .

To document this, researchers in the laboratory of Assistant Professor of Optics William Renninger developed a highly sensitive measuring technique. Their findings are reported in a paper published in APL Photonics.

“It is a very valuable fiber, and despite much interest by researchers and some companies, no one had actually studied the behavior of phonons supported by the structure, and to what extent it reduced ‘noise’ , ”Says Renninger, an expert in experimental and theoretical nonlinear optics.

The lab’s findings conclusively demonstrate that fiber is “a promising platform for low noise applications, such as for quantum information processing and optical communications,” writes lead author Arjun Iyer, a graduate research associate at Renninger’s laboratory is.

Unique answer to ‘noise’

“Noise” refers to any disturbance that masks or interrupts the signal being sent by light through optical fibers. Such a disturbance is caused by fons – acoustic or sound waves occurring at the atomic and sub-atomic levels, in this case, in an optical fiber glass.

Phonsons “disperse” light by acoustic waves, creating splinter beams of different frequencies, or colors, which can disrupt and reduce the energy of the main beam. While some forms of scattering may be useful for specific applications, it interferes with quantum applications and even basic optical communications.

Noise can be reduced by cooling the fiber to very low, cryogenic temperatures, but it is “very expensive and complex,” Renninger says. Another approach is to try to use complex error-correction algorithms to correct for noise.

The anti-resonant hollow-core fiber, however, represents a straightforward solution that also functions at room temperature. Created by co-author Rodrigo Amzecua Correira and other researchers at CREL, the College of Creole, Optics and Photonics at the University of Central Florida, the fiber features a unique arrangement of seven hollow capillaries arranged around a hollow core inside the fiber.

This leads to minimal overlap between the outer layer of glass fiber and the light traveling through the core, eliminating interference from the acoustic phonons emitted from the glass.

Tests conducted by Renninger’s laboratory showed that this mechanism is 10 times more effective at reducing noise than other hollow fiber designs. “The little noise that’s left is due to the acoustic waves in the air inside the fiber, so it would be 100 times more effective if you wanted to evacuate the air”, says Renninger. “You’ll have incredibly low noise”.

“If the fate of the world depends on reducing acoustic noise in optical fiber, this is the one you want to use.”

Using air to increase light

more information:
Arjun Iyer et al., Ultra-brillin scattering in anti-resonant hollow-core fibers, APL Photonics (2020). DOI: 10.1063 / 5.0017796

Provided by the University of Rochester

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