Showing papers by "Periklis Petropoulos published in 2019"
TL;DR: In this article, the first repeatered wavelength division multiplexing (WDM) experiments using a bismuth-doped exhibits 8.4 THz (50 nm) gain bandwidth in the O-band were presented.
Abstract: Extension in the reach of 1.3 μm optical communication systems has traditionally been restricted by the availability of suitable low-noise fiber amplifiers. Addressing this challenge, we present the first repeatered wavelength division multiplexing (WDM) experiments using a bismuth-doped exhibits 8.4 THz (50 nm) of gain bandwidth in the O-band. WDM signals arranged either with coarse or dense wavelength spacings are transmitted over lengths of single-mode fibre (SMF)-28e ranging between 100 and 140 km.
27 citations
01 Feb 2019
TL;DR: Anjum et al. as discussed by the authors proposed a Bandwidth enhancement of inter-modal four wave mixing Bragg scattering by means of dispersion engineering, which can be found in APL Photonics.
Abstract: Datasets supports Anjum, O. F. et al (2018). Bandwidth enhancement of inter-modal four wave mixing Bragg scattering by means of dispersion engineering. APL Photonics. DOI: 10.1063/1.5048495File descriptions are in 'Data.txt'
24 citations
03 Mar 2019
TL;DR: A Nested Antiresonant Nodeless hollow-core Fiber with 700nm bandwidth (1240–1940nm) and a minimum loss of 6.6dB/km at 1550nm is reported and Penalty-free 100-Gb/s PAM4 data transmission from O- to L-band is demonstrated over ∼1km of fiber.
Abstract: We report a Nested Antiresonant Nodeless hollow-core Fiber with 700nm bandwidth (1240–1940nm) and a minimum loss of 6.6dB/km at 1550nm. Penalty-free 100-Gb/s PAM4 data transmission from O- to L-band is demonstrated over ∼1km of fiber.
24 citations
TL;DR: In this paper, the authors demonstrate that broadband (>40 nm) four-wave mixing can be achieved between pump waves and a signal located in different bands of the communications spectrum (separated by 50nm).
Abstract: Dispersion engineering in optical waveguides allows applications relying on the precise control of phase matching conditions to be implemented. Although extremely effective over relatively narrow band spectral regions, dispersion control becomes increasingly challenging as the bandwidth of the process of interest increases. Phase matching can also be achieved by exploiting the propagation characteristics of waves exciting different spatial modes of the same waveguide. Phase matching control in this case relies on achieving very similar propagation characteristics across two, and even more, waveguide modes over the wavelengths of interest, which may be rather far from one another. We demonstrate here that broadband (>40 nm) four-wave mixing can be achieved between pump waves and a signal located in different bands of the communications spectrum (separated by 50 nm) by exploiting interband nonlinearities. Our demonstration is carried out in the silicon-rich silicon nitride material platform, which allows flexible device engineering, allowing for strong effective nonlinearity at telecommunications wavelengths without deleterious nonlinear-loss effects.
17 citations
TL;DR: In this article, an out-of-plane silicon grating coupler capable of mode-order conversion at the chip-fiber interface is designed and fabricated, and the final device is characterized through far-field profile and transmission measurements.
Abstract: An out-of-plane silicon grating coupler capable of mode-order conversion at the chip–fiber interface is designed and fabricated. Optimization of the structure is performed through finite-difference time-domain simulations, and the final device is characterized through far-field profile and transmission measurements. A coupling loss of 3.1 dB to a commercial two-mode fiber is measured for a single TE0→LP11 mode conversion grating, which includes a conversion penalty of 1.3 dB. Far-field patterns of the excited LP11 mode profile are also reported.
14 citations
TL;DR: In this paper, the authors demonstrate optical wavelength conversion in a multi-mode silicon waveguide using four wave mixing Bragg scattering enabled by a dual-pump CW scheme, where the original signal and the generated idler pair excite one spatial mode (first, TE mode), while the two pumps excite a different spatial mode of the same waveguide.
Abstract: We demonstrate optical wavelength conversion in a multi-mode silicon waveguide using four wave mixing Bragg scattering enabled by a dual-pump CW scheme. The original signal and the generated idler pair excite one spatial mode (first, TE mode), while the two pumps excite a different spatial mode (second, TE mode) of the same waveguide. Our approach exploits the differences in the group velocities of the various supported spatial modes to ensure phase matching only for the desired nonlinear process. In this proof-of-principle experiment, any unintended idlers are generated with an extinction ratio up to 12 dB relative to the phase-matched idlers for a pumps-to-signal-idler-pair wavelength detuning of about 70 nm. The scalability of the scheme to achieve larger and multiple signal wavelength detunings from the pump frequencies is also discussed.
13 citations
TL;DR: A means to selectively enhance wavelength conversion of WDM channels on a 100 GHz grid exploiting nonlinear effects between the spatial modes of a few mode fiber is experimentally demonstrated.
Abstract: We experimentally demonstrate a means to selectively enhance wavelength conversion of WDM channels on a 100 GHz grid exploiting nonlinear effects between the spatial modes of a few mode fiber. The selectivity of parametric gain is obtained by dispersion design of the fiber such that the inverse group velocity curves of the participating modes are parallel and their dispersion is suitably large. We describe both theoretically and experimentally the observed dependence of the idler gain profile on pump mode (quasi) degeneracy.
11 citations
24 Apr 2019
TL;DR: This work introduces an optical layer secure communication protocol that does not rely on nonlinear optical processes but instead uses energy redistribution of coherent optical waves interacting on a plasmonic metamaterial absorber and exploits signal processing mechanisms that can satisfy optical telecom data rate requirements in any current or next-generation frequency band.
Abstract: All-optical encryption of information in fibre telecommunication networks offers lower complexity and far higher data rates than electronic encryption can deliver. However, existing optical layer encryption methods, which are compatible with keys of unlimited length, are based on nonlinear processes that require intense optical fields. Here, we introduce an optical layer secure communication protocol that does not rely on nonlinear optical processes but instead uses energy redistribution of coherent optical waves interacting on a plasmonic metamaterial absorber. We implement the protocol in a telecommunication optical fibre information network, where signal and key distribution lines use a common coherent information carrier. We investigate and demonstrate different encryption modes, including a scheme providing perfect secrecy. All-optical cryptography, as demonstrated here, exploits signal processing mechanisms that can satisfy optical telecom data rate requirements in any current or next-generation frequency band with bandwidth exceeding 100 THz and a switching energy of a few photons per bit. This is the first demonstration of an optical telecommunications application of metamaterial technology.
8 citations
TL;DR: In this paper, the Si-rich nitride waveguides were used to achieve high-speed transmission at 2.5 GHz with negligible power penalty and achieved an efficiency as high as −18 dB.
Abstract: We show that subwavelength Si-rich nitride waveguides efficiently sustain high-speed transmissions at 2 μm. We report the transmission of a 10 Gbit/s signal over 3.5 cm with negligible power penalty. Parametric conversion in the pulsed pump regime is also demonstrated using the same waveguide structure with an efficiency as high as −18 dB.
7 citations
03 Mar 2019
TL;DR: A means to selectively enhance wavelength conversion of WDM channels on a 100 GHz grid exploiting nonlinear effects between the spatial modes of a few mode fiber is experimentally demonstrated.
Abstract: We experimentally demonstrate a means to selectively enhance wavelength conversion of WDM channels on a 100 GHz grid exploiting nonlinear effects between the spatial modes of a few mode fiber.
6 citations
15 Mar 2019
TL;DR: In this paper, the authors compare dispersion compensation using optical phase conjugation (OPC) to dispersion compensating fiber (DCF) and find an improvement in the received bit error ratio of an order of magnitude using OPC implementation.
Abstract: We demonstrate the transmission of 3 × 20 Gbaud PAM4 signals over a 360 km, field-deployed, amplified transmission link. We compare dispersion compensation using optical phase conjugation (OPC) to dispersion compensating fibre (DCF) and find an improvement in the received bit error ratio of an order of magnitude using our OPC implementation.
TL;DR: It is shown that subwavelength Si-rich nitride waveguides efficiently sustain high-speed transmissions at 2 μm with negligible power penalty and Parametric conversion in the pulsed pump regime is demonstrated using the same waveguide structure with an efficiency as high as -18 dB.
Abstract: We show that subwavelength silicon-rich nitride waveguides efficiently sustain high-speed transmissions at 2 $\mu$m. We report the transmission of a 10 Gbit/s signal over 3.5 cm with negligible power penalty. Parametric conversion in the pulsed pump regime is also demonstrated using the same waveguide structure with an efficiency as high as -18 dB.
01 Jan 2019
01 Jan 2019
TL;DR: In this article, a low polarisation dependent loss was used to achieve 132.8-Gb/s penalty-free transmission over ∼lkm fiber length without optical amplification, which is the state-of-the-art performance.
Abstract: We report beyond 100-Gb/s/λ adaptively-loaded discrete multitone (DMT) transmission over the S+C+L-bands using an ultra-wide bandwidth hollow-core Nested Antiresonant Modeless Fibre (NANF) with a low polarisation dependent loss. The results show up to 132.8-Gb/s penalty-free transmission over ∼lkm fibre length without optical amplification.
01 Jan 2019
TL;DR: Amplified transmission of WDM channels over the O- and C-bands using a bismuth-doped fiber amplifier was demonstrated in this paper, where the transmission medium is an ultra-wide bandwidth nested antiresonant fiber (NANF) offering uniform loss performance across all wavelengths of interest.
Abstract: Amplified transmission of WDM channels over the O- and C-bands is demonstrated using a bismuth-doped fibre amplifier The transmission medium is an ultra-wide bandwidth nested antiresonant fibre (NANF) offering uniform loss performance across all wavelengths of interest Comparable performance is obtained across the two bands
01 Jan 2019
05 May 2019
TL;DR: In this article, a vertical silicon grating coupler that converts the propagation mode order at the waveguide-fiber interface was fabricated and characterized, and far-field intensity patterns were presented for different device configurations.
Abstract: A vertical silicon grating coupler that converts the propagation mode order at the waveguide-fiber interface was fabricated and characterized. Far-field intensity patterns are presented for different device configurations and the coupling efficiency is reported. © 2019 The Author(s)
25 Oct 2019
TL;DR: In this paper, nonlinear phase retardation in an optical fiber can control the dissipation of coherent light waves interacting on a thin plasmonic absorber from total absorption to perfect transmission.
Abstract: All-optical data processing continues to attract significant interest as a way to overcome the electronic signal processing bottleneck of fiber telecommunication networks. Nonlinear optical devices such as limiters and saturable absorbers rely on intensity-dependent attenuation of light. However, making such devices using intensity-dependent multiphoton dissipation processes is an issue as these make complete absorption and transmission impossible. Here, we show that nonlinear phase retardation in an optical fiber can control the dissipation of coherent light waves interacting on a thin plasmonic absorber from total absorption to perfect transmission. The fiber’s instantaneous Kerr nonlinearity and the femtosecond coherent absorption time scale make this approach ultrafast. We report proof-of-principle demonstrations of all-optical intensity discrimination, power limiting, pulse restoration, pulse splitting, and signal transfer between carrier wavelengths within a fiber circuit. Our results indicate that nonlinear control of coherent absorption can imitate and outperform saturable and multiphoton absorption in terms of bandwidth and contrast.
03 Mar 2019
TL;DR: The results after transmission over 60km of SMF show that AMI outperforms the duobinary and on-off keying formats.
Abstract: We utilise the alternate mark inversion (AMI) scheme to mitigate the nonlinearity in O-band transmission. The results after transmission over 60km of SMF show that AMI outperforms the duobinary and on-off keying formats.
TL;DR: In this article, a new form of interferometry combining high phase sensitivity and excellent mechanical isolation is proposed and demonstrated, where a probe and reference tone are maintained in the same medium under test at all times, their ultimate homodyne detection is achieved by employing an optical programmable filter which is used to extract their relative phase difference.
Abstract: We propose and demonstrate a new form of interferometry combining high phase sensitivity and excellent mechanical isolation. These features arise from maintaining a probe and reference tone in the same medium under test at all times, their ultimate homodyne detection, as well as a novel method employing an optical programmable filter which is used to extract their relative phase difference. We present a compilation of studies performed to illustrate the applicability of the scheme to a range of measurements of optical propagation characteristics. Measurements include the chromatic dispersion of SMF-28 of lengths ranging from 1m to 1km, the nonlinear coefficient of highly nonlinear fibre and the phase transfer profile of an integrated optical ring resonator.
02 Nov 2019
TL;DR: This talk discusses the new avenues facilitated through the adoption of ultra-broadband hollow-core optical transmission fibres, paired with amplifiers covering alternative wavelength bands, combined with transmission experiments using these technologies over an extended optical bandwidth.
Abstract: This talk discusses the new avenues facilitated through the adoption of ultra-broadband hollow-core optical transmission fibres, paired with amplifiers covering alternative wavelength bands. Transmission experiments using these technologies over an extended optical bandwidth are presented.
02 Nov 2019
TL;DR: In this article, PECVD-based silicon nitride materials for range of applications are demonstrated for nonlinear functionalities in the C band, coarse wavelength division multiplexing in the O band and a 1-micron thick SiN waveguiding platform at 2 microns demonstrating filters and trimming capabilities.
Abstract: We demonstrate PECVD based silicon nitride materials for range of applications. These applications are for non-linear functionalities in the C band, coarse wavelength division multiplexing in the O band and a 1-micron thick SiN waveguiding platform at 2 microns demonstrating filters and trimming capabilities.
09 Jul 2019
TL;DR: It is shown that cm-long silicon and silicon-rich silicon nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm and the transmission of a 10 Gbit/s signal with negligible power penalty is reported.
Abstract: We show that cm-long silicon and silicon-rich silicon nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm. We report the transmission of a 10 Gbit/s signal with negligible power penalty. Parametric conversion in both continuous and pulsed pump regimes is also demonstrated, as well as the spectral broadening of picosecond pulses.
03 Oct 2019
TL;DR: In this paper, the authors demonstrate devices with enhanced linear and nonlinear functionalities in the near-infrared fabricated on a low temperature silicon nitride platform, including polarisation insensitive MUX/DEMUX, waveguides with enhanced non-linear effects useful for wavelength conversion applications and devices for the 2 μm wavelength range.
Abstract: We demonstrate devices with enhanced linear and nonlinear functionalities in the near-infrared fabricated on our low temperature silicon nitride platform. The devices include polarisation insensitive MUX/DEMUX, waveguides with enhanced non-linear effects useful for wavelength conversion applications and devices for the 2 μm wavelength range.
17 Sep 2019
TL;DR: In this article, the use of fiber-integrated plasmonic metamaterial absorbers in signal processing applications in coherent information networks is described, including perfect nonlinear absorption and all-optical gating.
Abstract: We report on the use of fiber-integrated plasmonic metamaterial absorbers in signal processing applications in coherent information networks. Quantum states filtering, perfect nonlinear absorption, all-optical gating and encrypted signal distribution are demonstrated.
TL;DR: This paper corrected the data in Table 1 in Photon. Res.7, 1036 (2019)2327-912510.1364/PRJ.7.001036.
Abstract: This publisher’s note corrects the data in Table 1 in Photon. Res.7, 1036 (2019)2327-912510.1364/PRJ.7.001036.
02 Nov 2019
TL;DR: In this article, the authors present a fiber that offers a 3dB bandwidth of 700nm (1240-1940nm), well in excess of the O+E+S+C+L-band range.
Abstract: Nested Antiresonant Nodeless hollow-core Fibers operating in the first passband offer potential for ultra-wide bandwidth operation and low optical losses. Here we review a fiber that offers a 3dB bandwidth of 700nm (1240–1940nm), well in excess of the O+E+S+C+L-band range.
01 Jan 2019
TL;DR: In this paper, cm-long silicon or silicon-rich nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm.
Abstract: We show that cm-long silicon or silicon-rich nitride waveguides with subwavelength transverse dimensions can efficiently sustain high-speed transmissions at 2 μm. We report the transmission of a 10 Gbit/s signal with negligible power penalty. Parametric conversion in both continuous and pulsed pump regimes is also demonstrated.
03 Mar 2019
TL;DR: The first demonstration of Bragg scattering inter-modal four-wave-mixing in silicon-rich SiN waveguides using two spatial modes is shown, exhibiting a maximum efficiency of −15-dB over a flat-bandwidth in excess of 30-nm.
Abstract: We show the first demonstration of Bragg scattering inter-modal four-wave-mixing in silicon-rich SiN waveguides. We report wavelength conversion using two spatial modes, exhibiting a maximum efficiency of −15-dB over a flat-bandwidth in excess of 30-nm.