•Tellurite–tungstate fiber glasses doped with Pr3+ and Pr3+/Yb3+ were produced.•Broadband emission at 1480nm is observed under 474nm pumping.•Pumping at 980nm an intense emission at 1330nm is ...observed in the codoped sample.•Rare-earth based NIR ultra-broadband emission is demonstrated.
A study of the broadband near-infrared emission in Pr3+ single doped and Pr3+/Yb3+ codoped tellurite–tungstate glasses for optical amplification is presented. In the Pr3+ single doped samples pumped at 474nm the emission band at 1480nm presents a FWHM of ∼140nm. The Yb3+ addition produces a FWHM broadening up to ∼155nm, achieved through the 1G4–3H5 transition. The emission spectra when the codoped sample is pumped at 980nm shows efficient energy transfer from Yb3+ to Pr3+, resulting in an intense Pr3+ emission around 1330nm. This shows that changing the pump wavelength it is possible to select the 1D2–1G4 or the 1G4–3H5 transition, displacing the emission band from ∼1480 to ∼1330nm.
The capacity of communication networks may be significantly improved by simply enhancing the optical amplifier bandwidth. This paper presents a numerical investigation of an ultra-broadband, ...low-ripple, two-pump-optical parametric amplifier (2P-OPA) that employs a tellurite glass buried-channel type nano-waveguide as nonlinear medium. The nano-waveguide was designed as a 25-cm-long Archimedean spiral that occupies a footprint of only ~2.5 mm
, with a ~0.7 μm
effective cross section. Its zero-dispersion wavelength is ~1550 nm, the nonlinear coefficient is ~3000 W
km
and the attenuation coefficient is ~0.5 dB/m (1100 to 1900 nm). Simulations suggest a 2P-OPA based on such waveguide will be able to amplify 243 QPSK input channels modulated at 56 Gbps over 102 nm bandwidth, over metropolitan area network scales.
In this paper, it is proposed and numerically tested a 4 −THz guard-band-less integrated all-optical wavelength converter (iAOWC) with two four-wave mixing (FWM) stages. The nonlinear media used in ...each stage is a waveguide with a tellurite core that is buried into a SiO2 substrate. The core is shaped as two interleaved spirals connected in their centers by two arcs of a circle to minimize bend loss. The iAOWC can continuously shift a 4 −THz WDM bandwidth from the C- to the L-band and vice versa. In the physical layer simulations, 80×28−GBaud, as DP-QPSK and DP-16QAM, 50-GHz-WDM signals were propagated, respectively, through typical distances found in ultra-long-haul and long-haul transmission systems. For up to four wavelength conversions, the penalties imposed on the signals bit-error-ratios by the iAOWCs were negligible. In the network layer simulations, blocking probabilities were estimated in the CORONET and PANEUR topologies supposing an incremental traffic scenario. Physical layer results were fundamental for the parameters (route lengths, wideband conversion, and spectral shift) considered in the network layer analysis. All network links could carry up to 160 wavelengths that extended from C- to L-band. It is shown that by using an iAOWC with bandwidth of 4-THz instead of 1-THz, both with the same spectral shift capability, to match the blocking probabilities achieved with OEOWCs, this would lead to a reduction of 50% and 40% in the number of required devices for the CORONET and PANEUR topologies, respectively. Finally, this is the first time that it is reported a joint analysis of the physical and network layers regarding the impact of wideband wavelength conversion on the performance of optical networks, specially using an integrated all-optical device and under real-world traffic scenarios.
•A wideband integrated all-optical wavelength converter was numerically tested.•Wavelength converter can operate with dual-polarization WDM signals.•Wavelength converter imposes negligible penalty on the WDM signals BER.•Physical and network layers analysis on the impact of wavelength conversion.•The wider the wavelength converter band, the fewer the required devices.
We demonstrate broadband second harmonic generation of low-energy pulses produced by injecting two single-frequency lasers into a highly nonlinear fiber. Full nonlinear conversion of the ...corresponding spectra, consisting of broadband (∼200
nm) optical frequency combs at ∼1580 nm, were obtained by using conventional birefringence phase-matching in two BIBO crystals (2-mm and 100-μm long) with a normal incidence configuration. The crystals were not tilted and the pulses were not compressed. This broadband conversion results from the large phase-matching bandwidth of the nonlinear BIBO crystals at ∼1550 nm, but also seems to be a consequence of a fundamental comb with small spectral phase variation.
Digital coherent reception has emerged as a potential solution for 100 Gbps passive optical networks (PONs). In this paper, we propose and analyze the simultaneous clustering of both polarizations in ...dual-polarization 16-ary quadrature amplitude modulation (DP-16QAM) to tackle the effects of the intra-polarization self-phase modulation and inter-polarization cross-phase modulation. Simulation results reveal that by processing the two polarizations, the performance of the nonlinear compensation is significantly enhanced. Thus, the proposed 4D clustering leads to range extensions of 13.6 km and 9 km for target bit error ratios of 10−3 and 10−2, respectively. Such range extension requires a block of around 8000 symbols and 5632 operations, which can be parallelized, requiring just 19 sequential operations.
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•We applied a clustering method to classify the in-phase and quadrature of the two polarizations.•We extended the range of the transmission link from 138 km to 151.6 km for a BER of 10−3.•The proposed method requires 5632 operations, which can be parallelized to reduce them to just 19.
A study of the broadband near-infrared emission in Pr super(3+) single doped and Pr super(3+)/Yb super(3+) codoped tellurite-tungstate glasses for optical amplification is presented. In the Pr ...super(3+) single doped samples pumped at 474 nm the emission band at 1480 nm presents a FWHM of similar to 140 nm. The Yb super(3+) addition produces a FWHM broadening up to similar to 155 nm, achieved through the super(1)G sub(4)- super(3)H sub(5) transition. The emission spectra when the codoped sample is pumped at 980 nm shows efficient energy transfer from Yb super(3+) to Pr super(3+), resulting in an intense Pr super(3+) emission around 1330 nm. This shows that changing the pump wavelength it is possible to select the super(1)D sub(2)- super(1)G sub(4) or the super(1)G sub(4)- super(3)H sub(5) transition, displacing the emission band from similar to 1480 to similar to 1330 nm.
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