Prof. Walter Belardi
Department of Engineering and Architecture, University of Parma, Parma, Emilia-Romagna, Italy
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Academic Career Length
26Years (2001-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications8 June 2001 in Measurement Science and Technology
Journal Article
TMTanya M Monro
Tanya M MonroWalter BelardiKFKentaro Furusawa
Kentaro FurusawaJBJoanne C Baggett
Joanne C Baggett
NBN G R Broderick
N G R Broderick
DRD J Richardson
D J Richardson21 March 2014 in Optics Letters
Journal Article
Walter BelardiJKJonathan C. Knight
Jonathan C. KnightAn improved design for hollow antiresonant fibers (HAFs) is presented. It consists of adding extra antiresonant glass elements within the air cladding region of an antiresonant hollow-core fiber. We use numerical simulations to compare fiber structures with and without the additional cladding elements in the near- and mid-IR regimes. We show that realizable fiber structures can provide greatly improved performance in terms of leakage and bending losses compared to previously reported antiresonant fibers. At mid-IR wavelengths, the adoption of this novel fiber design will lead to HAFs with reduced bending losses. In the near-IR, this design could lead to the fabrication of HAFs with very low attenuation.
18 April 2014 in Optics Express
Journal Article
Walter BelardiJKJonathan C. Knight
Jonathan C. KnightWe first use numerical simulations to show that bending losses of hollow antiresonant fibers are a strong function of their geometrical structure. We then demonstrate this by fabricating a hollow antiresonant fiber which presents a bending loss as low as 0.25dB/turn at a wavelength of 3.35μm and a bend radius of 2.5cm. This fiber has a relatively low attenuation (<200dB/km) over 600nm mid-infrared spectral range.
9 September 2015 in Journal of Lightwave Technology
Journal Article
Walter BelardiHollow core antiresonant fibers offer new possibilities in the near infrared and visible spectral range. I show here that the great flexibility of this technology can allow the design and fabrication of hollow core optical fibers with an extended transmission bandwidth in the near infrared and with very low optical attenuation in the visible wavelength regime. A very low attenuation of 175 dB/km at 480 nm is reported. A modification of the design of the studied fibers is proposed in order to achieve fast-responding gas detection.
10 September 2013 in Optics Express
Journal Article
Walter BelardiJKJonathan C. Knight
Jonathan C. KnightWe use numerical simulations to investigate how the curvature of the fiber core boundary influences the attenuation of hollow antiresonant fibers. We show the importance of a “negative” curvature core boundary in reducing confinement losses and also how, for certain curvatures, optical power is coupled resonantly to cladding modes. We simulate bending losses and find results in agreement with previously-reported experiments.
2 September 2014 in Optics Express
Journal Article
ZWZefeng Wang
Zefeng WangWalter Belardi
Fei YuWWWilliam J. Wadsworth
William J. WadsworthJKJonathan C. Knight
Jonathan C. KnightWe report 3.1-3.2 μm mid-infrared emission from acetylene-filled low loss antiresonant hollow-core fiber pumped with an amplified, modulated, narrowband, tunable 1.5 μm diode laser. The maximum power conversion efficiency of ~30%, with respect to the absorbed pump power, is obtained with a 10.5 m length of fiber at 0.7 mbar. The maximum efficiency with respect to the total incident pump power (~20%) and the minimum pump laser energy required (<50 nJ) are both improved compared to similar work reported previously using an optical parametric oscillator as a pump source. This paper provides an effective route to obtain compact mid-infrared fiber lasers.
About Me
Walter Belardi is an associate Professor within the Department of Engineering and Architecture, University of Parma.
Prof. Belardi is one of the main pioneers in the field of hollow core antiresonant optical fibers, especially thanks to the very first theoretical conception, proposal, and fabrication, in 2013, of a revolutionary structure of hollow core optical fiber, later referred to as Nested Antiresonant Nodeless Optical Fiber. This optical fiber type is today the most important candidate for high capacity data transmission with low latency and loss.
Moreover, Prof. Belardi has given major contributions to the development of simplified hollow core optical fibers for practical use in the mid-infrared spectral range.