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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - In Situ Fabrication of Far-Detuned Mid-Infrared Optical Fiber Wavelength Converters
摘要： In Situ Fabrication of Far-Detuned Mid-Infrared Optical Fiber Wavelength Converters. Chalcogenide (ChG) glasses have been identified as promising materials for applications in nonlinear photonics due to their exceptionally high nonlinear refractive index; nearly three orders of magnitude beyond that of silica glass. A ChG fiber or waveguide that is tapered down into a microwire provides strong light confinement and enhanced nonlinear optical effect, it allows engineerable chromatic dispersion and thereby an easy access to nonlinear parametric processes such as four-wave mixing (FWM). In well-controlled conditions of chromatic dispersion ChG microwires may lead to strong parametric gain that is far-detuned with respect to the pump wavelength, by tens of THz [1,2]. In theory, chromatic dispersion in a waveguide is precisely adjusted from a good control of waveguide geometry. In practice however, the amount of precision required in waveguide geometry as well as errors on the evaluation of refractive indices prevent the fabrication of wavelength converters with a predetermined wavelength offset. To illustrate this, fig. 1(a) shows the theoretical spectrum of a far-detuned ChG wavelength converter. A change in the core diameter by 5 nm results in a ~ 40 nm wavelength shift of the parametric sidebands. As an element of solution inspired from past reports, it has been shown with supercontinuum generation that experimental parameters could be finely tuned using an in situ monitoring technique [3]. In this work, we demonstrate that wavelength conversion of a ChG microwire is precisely attained by in situ tracking of the microwire output during the tapering process, enabling the fabrication of wavelength converters that are precisely far-detuned by at least 34.3 THz.
关键词： four-wave mixing,nonlinear photonics,in situ tapering,Chalcogenide glasses,wavelength conversion
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Raman Based Power Combining and Wavelength Conversion of Multiple Fiber Lasers — Number Scaling and Limits on Wavelength Separation
摘要： Cascaded Raman fiber lasers (CRFLs) based on random distributed feedback (RDFB) enable high-power fiber lasers at arbitrary wavelength bands [1,2]. To enable further power scaling in these systems, we recently proposed the use of multiple low-power pump sources instead of a single high-power pump laser [3]. Simultaneous power combining and wavelength conversion of two independent Ytterbium (Yb) lasers operating at different wavelengths into a single lasing wavelength at 1.5μm was demonstrated [3]. However, the questions on whether this technique works for more than 2 pump inputs and with arbitrary wavelength separation were unanswered. Here, we demonstrate that the technique works for more than 2 pump inputs and also with wavelength separation between the pump varying from 5nm to 29nm.
关键词： wavelength separation,power combining,Raman fiber lasers,Ytterbium lasers,wavelength conversion
更新于2025-09-12 10:27:22
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All-Optical Wavelength Conversion in an InP Photonic Integrated Turbo-Switch
摘要： We experimentally demonstrate all-optical wavelength conversion of 56 Gb/s non-return-to-zero (NRZ) signals in an Indium Phosphide (InP) photonic integrated circuit implementing a turbo-switch. The circuit consists of two cascaded semiconductor optical amplifiers (SOAs) with a bandpass filter in between. In this configuration, cross gain modulation (XGM) between a modulated input signal and a continuous wave (CW) light in the first SOA allows to generate a wavelength converted copy of the input signal, while the second SOA, fed by the probe signal selected by the filter, ensures a fast gain recovery. Operations in down- and up-conversion are shown by ER and BER measurements, demonstrating the effectiveness of the photonic integrated circuit (PIC).
关键词： all-optical wavelength conversion,semiconductor optical amplifiers,photonic integrated circuits,turbo-switch,Integrated optics
更新于2025-09-12 10:27:22
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Quasi-Phase-Matching Efficiency Optimization for Coupled Second-Order Nonlinear Processes
摘要： It is well known how to tailor the conversion ef?ciency grid of a single quasi-phase-matching (QPM) grating when the involved processes are uncoupled. However, it becomes much more sophisticated in the presence of coupling between multiple processes. In this case, different processes compete for the same QPM “resources” throughout the grating, and one process can outweigh the others over a certain range of interaction. Here we propose the generalized iterative domino (GID) algorithm to meet these challenges for the ?rst time (to our best knowledge). Instead of tailoring the strength of each “global” Fourier coef?cient, GID algorithm can properly adjust the spatially varying “local” Fourier coef?cients in favor of the ?nal yield. Three methods, including cascaded single-period (C1P) structure, quasi-periodic optical superlattice (QPOS), and hyper?ne aperiodic optical superlattice (HAOS) optimized by GID, are numerically and experimentally investigated under the platform of third-harmonic generation (THG). It shows that the THG ef?ciency of HAOS + GID can exceed the record achieved by C1P structure by 33%. This method is applicable to general wavelength converters involving with multiple coupled nonlinear processes.
关键词： Optical wavelength conversion,optimization methods,nonlinear optical device,optical harmonic generation
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Temporal Ghost Imaging with Wavelength Conversion
摘要： Ghost imaging is a non-direct measurement technique that uses the correlation between multiple probing patterns and the integrated signal measured after transmission (or reflection) through an object. [1] The resolution of the technique is determined by the characteristic length scale of the probing patterns fluctuations and/or the resolution with which they can be measured. Originally demonstrated in the spatial domain to reconstruct images of real physical objects, ghost imaging has been recently extended to the time-domain to measure ultrafast signals at telecom wavelengths [2]. In this work, we experimentally demonstrate ultrafast ghost imaging in the time-domain where the correlated intensities have completely different wavelengths. This wavelength-conversion temporal ghost-imaging scheme exploits fully the benefit of ghost imaging opening up new possibilities for ultrafast imaging in spectral regions where sensitive and/or fast detectors are not available and in particular the mid-infrared or THz range.
关键词： temporal domain,mid-infrared,ultrafast imaging,Ghost imaging,wavelength conversion,THz range
更新于2025-09-12 10:27:22
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An Efficient DFG Induced Wavelength Exchanged-OPC Using Only Two Ti:PPLN Waveguides with Single Pump Configuration
摘要： An unconventional single pump configuration of Wavelength Exchanged Optical Phase Conjugation (WE-OPC) through Difference Frequency Generation (DFG) employing two identical Ti:PPLN waveguides having same grating period and a single pump source is theoretically analyzed and simulated resulting in higher conversion efficiency of OPC.WE-OPC has been found very effective in extenuating nonlinearity and inflating spectral efficiency in optical transmission systems. The proposed WE-OPC enabled WDM optical transmission system modeled as a wavelength converter has been simulated with 10 channels offering much higher conversion efficiencies of about 3.3 dB and 3.49 dB for higher frequency band to lower frequency band and vice versa respectively.
关键词： Fiber optics communications,Dispersion compensation devices,Fiber optics and optical communications,Optical Phase conjugation,Wavelength conversion devices
更新于2025-09-12 10:27:22
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[IEEE 2018 International Conference on Smart Computing and Electronic Enterprise (ICSCEE) - Shah Alam, Malaysia (2018.7.11-2018.7.12)] 2018 International Conference on Smart Computing and Electronic Enterprise (ICSCEE) - Performance Evaluation of a WDM Optical Network Node with Wavelength Convertible Optical Burst Switching
摘要： Analytical results are presented for a WDM optical burst switching network to determine the optimum network parameters for a specified burst loss rate. Results are presented as a function of wavelength conversion capability, WDM channel’s number, number of slots per burst and burst arrival probability regarding burst loss rate. It is observed that at a given BLR of ???????, required wavelength conversion capability is less for high number of WDM channels. At a certain number of WDM channel and given BLR of ???????, for more slot’s number, wavelength conversion capability required is higher. Optimum number of slots per burst are also found for a given wavelength number, BLR of ??????? and wavelength conversion capability.
关键词： wavelength’s number,burst arrival probability,number of slots per burst,burst loss rate (BLR),Optical burst switching (OBS),wavelength conversion capability
更新于2025-09-09 09:28:46