J.P. Wooler
University of Southampton
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Featured researches published by J.P. Wooler.
Optics Express | 2013
M.N. Petrovich; Francesco Poletti; J.P. Wooler; A.M. Heidt; Naveen K. Baddela; Z. Li; D. R. Gray; Radan Slavík; Francesca Parmigiani; Natalie V. Wheeler; John R. Hayes; E. Numkam; L. Grüner-Nielsen; Bera Palsdottir; Richard Phelan; Brian Kelly; John O'Carroll; Martin Becker; Naoise MacSuibhne; Jian Zhao; F. C. Garcia Gunning; Andrew D. Ellis; Periklis Petropoulos; Shaif-ul Alam; David J. Richardson
The first demonstration of a hollow core photonic bandgap fiber (HC-PBGF) suitable for high-rate data transmission in the 2 µm waveband is presented. The fiber has a record low loss for this wavelength region (4.5 dB/km at 1980 nm) and a >150 nm wide surface-mode-free transmission window at the center of the bandgap. Detailed analysis of the optical modes and their propagation along the fiber, carried out using a time-of-flight technique in conjunction with spatially and spectrally resolved (S2) imaging, provides clear evidence that the HC-PBGF can be operated as quasi-single mode even though it supports up to four mode groups. Through the use of a custom built Thulium doped fiber amplifier with gain bandwidth closely matched to the fibers low loss window, error-free 8 Gbit/s transmission in an optically amplified data channel at 2008 nm over 290 m of 19 cell HC-PBGF is reported.
Journal of Lightwave Technology | 2014
V.A.J.M. Sleiffer; Yongmin Jung; Naveen K. Baddela; J. Surof; Maxim Kuschnerov; V. Veljanovski; John R. Hayes; Natalie V. Wheeler; Eric Numkam Fokoua; J.P. Wooler; D. R. Gray; Nicholas H. L. Wong; Francesca Parmigiani; Shaif-ul Alam; M.N. Petrovich; Francesco Poletti; David J. Richardson; Huug de Waardt
We present the first demonstration of combined wavelength-division multiplexed (WDM) and mode-division multiplexed (MDM) optical transmission in a hollow-core photonic bandgap fiber (HC-PBGF). For this purpose a novel low loss, broadband 310 m long HC-PBGF with a 37 cell (37c) core geometry is used. The modal properties of the HC-PBGF are characterized in detail, showing an absence of surface modes and low modal crosstalk, which enable WDM and MDM transmission with record high capacity (73.7 Tb/s) for a HC-PBGF. Several modulation formats have been tested, showing very good and stable performance. The transmission properties are assessed by looking into both single-mode transmission and MDM transmission, showing good agreement with the modal characterization of the 37c HC-PGBF.
Optics Express | 2015
H. Zhang; N. Kavanagh; Z. Li; Jian Zhao; N. Ye; Yong Chen; Natalie V. Wheeler; J.P. Wooler; John R. Hayes; Seyed Reza Sandoghchi; Francesco Poletti; M.N. Petrovich; Shaif-ul Alam; Richard Phelan; J. O’Carroll; Brian Kelly; L. Grüner-Nielsen; David J. Richardson; Brian Corbett; F. C. Garcia Gunning
We show for the first time 100 Gbit/s total capacity at 2 µm waveband, using 4 × 9.3 Gbit/s 4-ASK Fast-OFDM direct modulation and 4 × 15.7 Gbit/s NRZ-OOK external modulation, spanning a 36.3 nm wide wavelength range. WDM transmission was successfully demonstrated over 1.15 km of low-loss hollow core photonic bandgap fiber (HC-PBGF) and over 1 km of solid core fiber (SCF). We conclude that the OSNR penalty associated with the SCF is minimal, while a ~1-2 dB penalty was observed after the HC-PBGF probably due to mode coupling to higher-order modes.
Journal of Lightwave Technology | 2015
Zhixin Liu; Yong Chen; Zhihong Li; Brian Kelly; Richard Phelan; John O'Carroll; T. Bradley; J.P. Wooler; Natalie V. Wheeler; A.M. Heidt; Thomas Richter; Colja Schubert; Martin Becker; Francesco Poletti; M.N. Petrovich; Shaif-ul Alam; David J. Richardson; Radan Slavík
The 2-μm wave band is emerging as a potential new window for optical telecommunications with several distinct advantages over the traditional 1.55 μm region. First of all, the hollow-core photonic band gap fiber (HC-PBGF) is an emerging transmission fiber candidate with ultra-low nonlinearity and lowest latency (0.3% slower than light propagating in vacuum) that has its minimum loss within the 2-μm wavelength band. Second, the thulium-doped fiber amplifier that operates in this spectral region provides significantly more bandwidth than the erbium-doped fiber amplifier. In this paper, we demonstrate a single-channel 2-μm transmitter capable of delivering >52 Gbit/s data signals, which is twice the capacity previously demonstrated. To achieve this, we employ discrete multitone modulation via direct current modulation of a Fabry-Perot semiconductor laser. The 4.4-GHz modulation bandwidth of the laser is enhanced by optical injection locking, providing up to 11 GHz modulation bandwidth. Transmission over 500-m and 3.8-km samples of HC-PBGF is demonstrated.
optical fiber communication conference | 2013
Yongmin Jung; V.A.J.M. Sleiffer; Naveen K. Baddela; M.N. Petrovich; John R. Hayes; Natalie V. Wheeler; D. R. Gray; E. Numkam Fokoua; J.P. Wooler; Nicholas H. L. Wong; Francesca Parmigiani; Shaif-ul Alam; J. Surof; Maxim Kuschnerov; V. Veljanovski; H. de Waardt; Francesco Poletti; David J. Richardson
We report fabrication of the first low-loss, broadband 37-cell photonic bandgap fiber. Exploiting absence of surface modes and low cross-talk in the fiber we demonstrate mode division multiplexing over three modes with record transmission capacity.
Optics Express | 2014
Seyed Reza Sandoghchi; Gregory T. Jasion; Natalie V. Wheeler; Saurabh Jain; Zhenggang Lian; J.P. Wooler; Richard P. Boardman; Naveen K. Baddela; Yong Chen; John R. Hayes; E. Numkam Fokoua; T. Bradley; D. R. Gray; S. Abokhamis Mousavi; M.N. Petrovich; Francesco Poletti; David J. Richardson
Specialty optical fibers, in particular microstructured and multi-material optical fibers, have complex geometry in terms of structure and/or material composition. Their fabrication, although rapidly developing, is still at a very early stage of development compared with conventional optical fibers. Structural characterization of these fibers during every step of their multi-stage fabrication process is paramount to optimize the fiber-drawing process. The complexity of these fibers restricts the use of conventional refractometry and microscopy techniques to determine their structural and material composition. Here we present, to the best of our knowledge, the first nondestructive structural and material investigation of specialty optical fibers using X-ray computed tomography (CT) methods, not achievable using other techniques. Recent advances in X-ray CT techniques allow the examination of optical fibers and their preforms with sub-micron resolution while preserving the specimen for onward processing and use. In this work, we study some of the most challenging specialty optical fibers and their preforms. We analyze a hollow core photonic band gap fiber and its preforms, and bond quality at the joint between two fusion-spliced hollow core fibers. Additionally, we studied a multi-element optical fiber and a metal incorporated dual suspended-core optical fiber. The application of X-ray CT can be extended to almost all optical fiber types, preforms and devices.
optical fiber communication conference | 2013
V.A.J.M. Sleiffer; Yongmin Jung; Paolo Leoni; Maxim Kuschnerov; Natalie V. Wheeler; Naveen K. Baddela; R.G.H. van Uden; Cm Chigo Okonkwo; John R. Hayes; J.P. Wooler; E. Numkam; Radan Slavík; Francesco Poletti; M.N. Petrovich; V. Veljanovski; Shaif-ul Alam; David J. Richardson; H. de Waardt
We report for the first time coherently-detected, polarization-multiplexed transmission over photonic band gap fiber. By transmitting 96 × 320-Gb/s DP-32QAM modulated channels, a net data rate of 24 Tb/s was obtained.
Workshop on Specialty Optical Fibers and their Applications (2013), paper W3.26 | 2013
J.P. Wooler; Seyed Reza Sandoghchi; D. R. Gray; Francesco Poletti; M.N. Petrovich; Natalie V. Wheeler; Naveen K. Baddela; David J. Richardson
The application of a novel splice technique for bonding solid core and hollow core microstructure fibers of dissimilar diameters, with low loss, is discussed and results of mechanical and optical performance presented.
optical fiber communication conference | 2014
Seyed Reza Sandoghchi; T. Zhang; J.P. Wooler; Naveen K. Baddela; Natalie V. Wheeler; Yong Chen; Gregory T. Jasion; D. R. Gray; E. Numkam Fokoua; John R. Hayes; M.N. Petrovich; Francesco Poletti; David J. Richardson
To improve yield in fabricated HC-PBGFs we have studied morphology and longitudinal evolution of occasional, undesired defects causing localized loss. The short spatial and temporal duration of the defects seems indicative of residual preform contaminations.
european conference on optical communication | 2014
H. Zhang; Z. Li; N. Kavanagh; Jian Zhao; N. Ye; Yong Chen; Natalie V. Wheeler; J.P. Wooler; John R. Hayes; Seyed Reza Sandoghchi; Francesco Poletti; M.N. Petrovich; Richard Phelan; John O'Carroll; Brian Kelly; David J. Richardson; Brian Corbett; F. C. Garcia Gunning
This paper presents WDM transmission at 2μm over 1.15km of HC-PBGF with wavelength channels selected to span a 36.3nm waveband. A total capacity of 81Gbit/s was achieved using 4×12.5Gbit/s NRZ-OOK external modulation and 4×7.7Gbit/s 4-ASK Fast-OFDM direct modulation signals.