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We present an experimental study of the temperature sensitivity of three different step-index 1-mm PMMA fibers. Two of these fibers have a special jacket to sustain high temperatures: BH-4001 and LHXE-4001 and the other is a standard, GH-4001 fiber with a polyethylene jacket. We show that the fibers perform well within the manufacturer specified temperature operating ranges. Predictably, higher than...
We have developed a low complexity machine learning based nonlinear impairment equalization scheme and demonstrated its successful performance in SDM transmission links achieving compensation of both inter- and intra- channel Kerr-based nonlinear effects. The method operates in one sample per symbol and in one computational step. It is adaptive, i.e. it does not require a knowledge of system parameters,...
We introduce FFSS, an optical fiber simulator entirely developed in MATLAB® which takes advantage of parallel calculation on graphic processing units (GPU). This software solves the nonlinear Schrödinger equation (NLSE) - the single-mode fiber wave equation - relying on the well-known split-step Fourier method (SSFM). FFSS operates on either the PMD-Manakov equation (PMD-ME) that averages out random...
The wavelength division multiplexing (WDM) type optical communication significantly increases the transmission capacity. However, one of the key issues is how we can reduce the pulse broadening and the interaction between the neighboring channels due to the nonlinear effects. The optical soliton offers the answer to this question. The soliton pulse can keep its shape during propagation, when there...
We envision the application of optical Space-division Multiplexing (SDM) to the next generation fiber-wireless communications as a firm candidate to increase the end user capacity and provide adaptive radiofrequency-photonic interfaces. This approach relies on the concept of “fiber-distributed signal processing”, where the SDM fiber provides not only radio access distribution but also broadband microwave...
The forecasted traffic growth makes the transmission capacity in backbone optical networks a scarce resource. Enabling the use of high-spectral-efficiency modulation formats (HSE-MFs) such as DQPSK or PM-QPSK for 40 or 100 Gbps respectively is one of the suggested on-going researches. However, some lightpaths may not require the highest rate and this call for mixed-line rate (MLR) networks. In MLR...
This paper estimates the nonlinear refractive index of low attenuation bend insensitive fiber through experiments and simulation. We have studied and analysed the impact of all optical parameters such as wavelength difference of dual-frequency input signal, fiber length, effective area and dispersion on nonlinearity measurements of this fiber. In addition, a comparative study has been made between...
We have proposed an exhaustive experimental study of dissipative soliton resonance in a double clad Er:Yb co-doped dual amplifier passively mode-locked figure-of-eight fiber laser. By adjusting the pumping powers of the amplifiers, both the amplitude and width of the output square-wave pulse can be tuned continuously. Moreover, some other key parameters such as the net cavity dispersion and the coupling...
We demonstrate an active random fiber laser by directly pumping a 100 m erbium-doped fiber at 980 nm wavelength, with a fiber loop mirror forming a half-open cavity. Random lasing with competing spectral modes in the range from 1535 nm to 1560 nm is achieved, with the maximum lasing slope efficiency around 10%. We also study the effect of combining a dispersion compensated fiber with the erbium-doped...
In this paper, a simulation model of a multicore fiber in the linear regime is presented. We describe how to digitally represent the fiber and introduce a modelling scheme based on Coupled-Mode theory and Power-Coupled theory to analyze the system performance of multicore fibers. In order to validate the investigated model, the obtained simulation results are compared to our own measurements of a...
Ultrahigh-speed (>50 Gb/s) short-reach fiber-optic links can be implemented cost-effectively by using directly modulated lasers (DMLs). For demonstrations, we successfully transmit 56-Gb/s PAM-4 signal over 20 km of SSMF by using 1.5-µm DML and 117-Gb/s DMT signal over 30 km of SSMF by using 1.3-µm DML.
Dispersion has very strong detrimental effects on high data rate incoherent transmission systems. Situation gets much worse when data bits become only a few picoseconds long. In this paper we investigate how the dispersion can affect an optical auto-correlation function in optical code division multiple access (OCDMA) systems when data are carried by two-dimensional wavelength-hopping time-spreading...
We present the experimental demonstration of in-fiber acousto-optic coupling in a polyimide-coated optical fiber. Although the presence of the polyimide coating increases is significantly the attenuation of the acoustic wave, we show that acousto-optic interaction can still be produced with reasonable efficiency. The effect of the polyimide coating on the acousto-optic interaction process is analyzed...
In this paper, the ultimate limit of the signal to nonlinear noise ratio (SNRNLI) for high bit rate system operating near zero-dispersion wavelength is calculated. Carried out simulations revealed that the shape coefficient (Φ) is a very important factor that must be taken into account in the theoretical model.
In this paper, we thoroughly investigate how evolutions of accumulated differential group delay (DGD) along the fiber link depend on the fiber polarization mode dispersion coefficient (PMDc). We show that PMD statistics is important for simulating nonlinearity-PMD interactions and results depend on the way the PMD statistics is chosen. The results are demonstrated for the PMD-affected conventional...
FYLA manufactures ns, ps and fs proprietary fiber lasers in the range of 1, 1.5, 2.0 µm wavelengths and supercontinuum VIS to NIR bands. The go-to-market approach of FYLA is based on an R+D strategy deeply focused on our (current and future) customer needs. This paper presents a selection of advanced solutions based in supercontinuum illumination that have been developed to satisfy such needs and...
This paper updates the study of anti-resonant hollow-core fibers (AR-HCFs) and their applications. Such fibers have been shown to offer low-loss transmission windows which greatly extend the traditional spectral regions of hollow-core fibers into visible and mid-IR. The single-mode performance, large mode area, low dispersion and low nonlinearity make AR-HCF the most promising medium for high-power...
In this article, we experimentally investigate the dynamics of dissipative soliton resonance (DSR) square pulses in different all-anomalous passively mode-locked double-clad Er:Yb fiber laser setups. In the figure-of-eight configuration, the aim of employing an amplifier in each loop is to control the output pulse's amplitude and width, which depend on the pumping power. At a maximum total pumping...
We overview recent advances in the spatio-temporal nonlinear dynamics of optical pulses propagating in multimode optical fibers. The Kerr effect leads to spatial beam self-cleaning in a graded-index multimode optical fiber, followed by sideband series generation spanning multiple octaves. Effectively single mode supercontinuum spanning from the visible to the mid-infrared was also demonstrated. Enhancement...
Spatial-Division Multiplexing (SDM) technology aims to overcome capacity limits of single-mode transmission links. Design and characterization of such ultra-high capacity systems requires numerical techniques capable of dealing with vast amounts of data simulating nonlinear transmission and interaction of signals propagating in numerous spatial channels at different wavelengths, thus imposing serious...
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