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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Dispersion-Managed Soliton Molecules in An All-Fiber Mode-Locked Fiber Laser With Near Zero Dispersion
摘要： Characterized by particle-like behaviors, soliton molecules interesting further unveil vivid multi-soliton dynamics and the research pulse-interaction scenarios community of ultrafast fiber lasers. Here, we report the formation of dispersion-managed solitons (DMSs) in an all-fiber laser passively mode-locked by a 45° tilted fiber grating (45° TFG) near the zero-dispersion regime. Particularly, typical DMS singlets are observed, possessing a broadband and smooth spectral shape. reinforced Besides, on stretching-compressing process during the pulse propagation, various multi-pulse DMS molecules are also discovered. Moreover, transient soliton dynamics of dual-pulse and triple-pulse DMS molecules covering the timescale over hundreds of round trips are illustrated based on dispersive Fourier transformation (DFT) technique. The investigation of multi-soliton compounds, caused by direct soliton interaction, probably paves access to the explorations of nonlinear dynamics in mode-locked lasers.
关键词： mode-locked fiber laser,45° tilted fiber grating,soliton molecules,dispersion-managed soliton
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - The nonlinear optical properties of few-layer VSe <sub/>2</sub> nanosheets
摘要： Vanadium Diselenide (VSe2) has a high electrical conductivity owing to the electron delocalization of the vanadium lattice framework. Most of previous research has been focused on its electronic properties. The nonlinear optical properties of VSe2 have not been investigated yet. Herein, we prepared few-layer VSe2 nanoflakes by liquid phase exfoliation. Subsequently, we utilized Z-scan technique to study the nonlinear optical properties of few-layer VSe2 nanoflakes. And we prepared VSe2 based saturable absorbers (SA) and achieved passively mode-locked operation in Er-doped fiber laser. The results indicate that VSe2 nanosheets own remarkable nonlinear optical properties and could be employed as ideal saturable absorption materials in pulsed fiber lasers.
关键词： Mode-locked,Saturable absorbers,Vanadium Diselenide,Nonlinear optical materials
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Soliton Self-Frequency Shift in Mode Locked Fiber Lasers
摘要： We propose and demonstrate the soliton evolution in a mode locked Er-doped fiber laser with intra-cavity soliton self-frequency shift by numerical simulation, and analyze effects of different parameters including of pump strength, length of dispersion shift fiber (DSF), and modulation depth of saturable absorber in detail for the first time. The results show that once the stable output pulse is formed, the frequency shift amount would increase with increasing the pump strength or decreasing the length of DSF and the modulation depth.
关键词： fiber lasers,red shift,Soliton self-frequency shift,mode locked pulse
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 4th Optoelectronics Global Conference (OGC) - Shenzhen, China (2019.9.3-2019.9.6)] 2019 IEEE 4th Optoelectronics Global Conference (OGC) - Harmonic Condensed Soliton Phase in a Mode-Locked Fiber Laser
摘要： A new harmonic mode-locked pattern is reported in passively mode-locked fiber laser (MLFL). The laser base on gold nanorods (GNRs) as a mechanism to trigger mode locking. By adjusting polarization controllers and pumping power, including fundamental mode-locked pulse, condensed soliton phase, soliton rain, harmonic condensed soliton phase have been observed. The harmonics condensed soliton phase were experimentally verified for the first time in the MLFL. The experimental results explained the conditions for the generation of condensed soliton phase and extend the pulse type of harmonic mode-locking (HML).
关键词： harmonic mode-locked,fiber laser,condensed soliton phase,gold nanorods
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) - Bochum, Germany (2019.7.16-2019.7.18)] 2019 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) - Characterization and Application of a Commercially Available Laser Diode in a THz System
摘要： In this work, we characterize a commercially available laser diode. The complex optical spectrum shows that most of the laser modes have a fixed phase relation, i.e. the laser is mode-locked. By choosing a single-mode fiber with appropriate length, the intrinsic chirp of the laser can be compensated. As a result, the amplitude of the detected THz signal is increased by a factor of 16.
关键词： mode-locked laser diodes,terahertz technology,time-domain spectroscopy
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) - Temporal Localized Structures in Mode-Locked Vertical External-Cavity Surface-Emitting Lasers
摘要： The possibility of using optical Localized States (LSs) in resonators to code and process information bits has attracted a great deal of attention in the last twenty years [1]. LSs are stable solutions of dissipative systems characterized by a correlation range much shorter than the size of the hosting system. Temporal LSs (TLSs) have been recently reported in passively mode-locked (PML) semiconductor lasers [2]. It was shown that for cavity round-trip (cid:87) larger than the gain recovery (cid:87)g and for large modulation of the losses induced by the absorber, several pulsating states with different number of pulses coexist for the same parameter values. In this multistable regime mode-locked pulses become localized, i.e. they can be addressed individually [3]. This was implemented in an electrically-pumped broad-area Vertical-Cavity Surface-Emitting Laser (VCSEL) coupled to a resonant semiconductor saturable absorber mirror (SESAM). VCSEL far-field transverse profile was imaged onto the SESAM in a self-collimating scheme for achieving stable mode-locking regime [4]. Though this peculiar scheme allowed efficient saturation of the SESAM, it also induced global coupling of the VCSEL’s transverse section.
关键词： Localized States,mode-locked,Temporal Localized Structures,Vertical External-Cavity Surface-Emitting Lasers
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) - Pulse Timing and Amplitude Stability of a Monolithic Passively Mode-Locked Quantum Dot Laser at 1310 nm Directly Grown on Silicon
摘要： Passively mode-locked (PML) InAs/InGaAs quantum dot (QD) lasers directly grown on silicon and emitting at 1310 nm are promising sources for high-speed, high-capacity communication applications. To overcome the low light generation efficiency of silicon, QD are directly grown on Si [1]. Their ultrafast carrier dynamics, broadband gain spectra and easily saturated gain and absorption allow for the generation of ultra-short optical pulses as demonstrated very recently [2]. The QD laser epitaxial growth was completed on an on-axis (001) Si substrate with a 45 nm GaP buffer layer by solid-source molecular beam epitaxy [3]. In this contribution, the pulse train stability of a PML QD laser consisting of a five-stack InAs/InGaAs dots-in-a-well structure is experimentally studied. The total length of the laser was designed to be 4.5 mm with a saturable absorber length corresponding to 18 %. The isolation length between gain and absorber section is 10 μm. The laser emits optical pulse trains at a repetition rate (RR) of 9.4 GHz. Fig. 1a depicts the pulse-to-pulse timing jitter (TJ) σpt p = 0.5 [4] with Δν being the RR line width in the radio-frequency (RF) spectrum and ν0 being the RR. The TJ is calculated from the timing phase noise (TPN) power spectral densities (PSD) [5] in dependence on the absorber reverse bias voltage and the gain current. Low TJ values of around 100 fs to 200 fs can be identified in the majority of biasing regimes. In the regime for shortest pulses with pulse widths below 5 ps, located just above lasing threshold and at gain currents below 120 mA, very low TJ values (color coded purple) are obtained. A lowest TJ of 9 fs (-3 dB fundamental RR beat note line width of 400 Hz) is obtained at a gain current of 105 mA and an absorber reverse bias voltage of 0.6 V, slightly above lasing threshold. The corresponding TPN PSD is depicted in Fig. 1b. The optical pulse train amplitude jitter (AJ) is quantified as a relative standard deviation of the pulse intensity variations [6]. As indicated in Fig. 1c, an AJ below 5 % is attained in the short pulse regime which is located at gain currents below 120 mA and at higher currents and low saturable absorber voltages (color coded purple). Such low AJ denotes excellent stable operation. Fig. 1d depicts the nonlinear intensity auto-correlation signal representing the shortest deconvoluted pulse width of 1.7 ps at 125 mA and 2.6 V absorber reverse bias voltage. The corresponding time-bandwidth product amounts to 1.1. Pulses with pulse widths shorter than 10 ps where obtained at all biasing conditions except for high gain currents above 140 mA and small absorber reverse bias voltages below 0.6 V. In this small regime pulse widths of 10 ps to 18 ps are obtained. In conclusion, stable optical pulse train generation by a monolithic passively mode-locked InAs/InGaAs quantum dot laser directly grown on silicon with a lowest optical pulse width of 1.7 ps, a lowest timing jitter of 9 fs (400 Hz RR beat note line width) and a negligible relative amplitude jitter are experimentally reported.
关键词： timing jitter,silicon,quantum dot laser,amplitude jitter,mode-locked
更新于2025-09-16 10:30:52
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A chaotic state in the transition from single- toward multiple pulse for soliton fiber lasers
摘要： High-order soliton in anomalous-dispersion ultrafast fiber lasers is rarely researched due to its intrinsic instability in dissipative systems. For the first time, we numerically demonstrate the ultrafast pulse in fiber lasers will deviate from the fundamental soliton under strong pulse energy before splitting into multiple pulses. High-order soliton effect results in the single-pulse splitting into the dual-pulse. Sustaining switching between the single- and dual-pulse induced by the high-order soliton evolution and cross-gain-modulation was observed and analyzed. The results offer significant and novel insights for the soliton shaping dynamics and instability in anomalous-dispersion fiber lasers.
关键词： Mode-locked lasers,nonlinear fiber optics,temporal soliton and pulse propagation
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) - Scrutinizing the Equidistance of Frequency Comb Sources
摘要： Frequency combs have revolutionized frequency metrology, enabling optical clockworks with unprecedended precisions approaching the 10-18 range. Early frequency comb measurements exclusively relied on mode-locked lasers, which provide a periodic waveform as a matter of working principle. In turn, the resulting frequency comb is guaranteed to be absolutely equidistant. While this expectation is ultimately based on theoretical mode-locking models, experimental tests have scrutinized deviations from equidistance of mode-locked laser combs down to the 10-15 level. Experimental tests of equidistance are rather elaborate and typically require beating of different spectral parts of the comb with a reference comb. Such tests have also been performed with microresonator combs, which are not a priori guaranteed to be equidistant from theoretical considerations. Finally, there are rather recent reports of quantum cascade laser combs; yet careful investigations of the equidistance of such sources still appear to be outstanding. Here we propose and demonstrate a novel experimental test for the equidistance of frequency combs.
关键词： metrology,frequency combs,mode-locked lasers,equidistance
更新于2025-09-16 10:30:52
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NiPS <sub/>3</sub> nanosheets for passive pulse generation in an Er-doped fiber laser
摘要： With the rapidly increasing demands of industrial material processing, biomedical sensing, light detection, and high-speed communication, various novel two-dimensional (2D) materials have been synthesized and employed in ultrafast fiber laser generation due to their advantages of easy processing characteristics, desirable structures and excellent nonlinear optical properties. However, finding an efficient 2D material-based saturable absorber (SA) with the capacity of both high stability and excellent working property performance remains a challenge. Herein, high-quality NiPS3 crystals, from the metal phosphorus trichalcogenide (MPT3) family, were synthesized by a modified chemical vapor transport (CVT) method and a few-layer NiPS3 nanosheet SA was easily obtained using a direct liquid-phase exfoliation method. Different from other 2D materials, ultrathin NiPS3 nanosheets display a good stability. Moreover, a passively Q-switched operation and dual-wavelength mode-locked pulse output were proposed based on a NiPS3-SA erbium-doped fiber (EDF) laser. In the passively Q-switched operation, the maximum peak power was 6.40 mW with a maximum pulse energy of 29.66 nJ. It is also worth noting that dual-wavelength pulse output was achieved in passively mode-locked pulse generation. These results not only supply other choices of SAs for pulse generation, but also provide guidance to extend other possible applications of the MPT3 family for nonlinear optics.
关键词： mode-locked,Q-switched,NiPS3 nanosheets,ultrafast fiber laser,saturable absorber
更新于2025-09-16 10:30:52