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[IEEE 2019 IEEE 14th Malaysia International Conference on Communication (MICC) - Selangor, Malaysia (2019.12.2-2019.12.4)] 2019 IEEE 14th Malaysia International Conference on Communication (MICC) - Investigation of Q-switched and Mode-Locked Erbium-Doped Fiber Laser Using Graphene oxide-Saturable Absorber
摘要： This paper experimentally investigates a simple configuration of an erbium-doped fiber laser (EDFL) cavity to generate mode-locked and Q-switched pulses utilize graphene oxide as saturable absorber (GO-SA). The GO-SA chip is a chip placed as a sandwich between two fiber ferrules and incorporates a ring laser cavity to generate a pulse train. Results indicate that the cavity of passive Q-switching EDFL is capable of providing pulses at 1532nm with a pulse width within a range of 5.32μs to 2.6μs, a repetition rate of 59.5kHz to 71.74kHz, a pulse energy of 364.64nJ to 668.95nJ, and an output power ranging from 0.062mW to 0.136mW, when the configuration is pumped by a 980nm laser diode, the power of which gradually increases from 21.7mW to 47.9mW. The output of the GO-SA needs to be connected to 200m of a single-mode fiber (SMF) to generate mode-locked pulses at 1559nm when the pump power is 157.6mW. As a result, an output power of 1.29mW is delivered with a repetition rate of 1.002MHz.
关键词： Erbium-Doped Fiber Laser,Q-switched,Saturable Absorber,Mode-Locked,Graphene oxide
更新于2025-09-19 17:13:59
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Tunable Q-switched ytterbium-doped fibre laser with Nickel Oxide saturable absorber
摘要： A passively Q-switched ytterbium-doped fibre laser (YDFL) using a nickel oxide-based saturable absorber is proposed and demonstrated. The Q-switched YDFL is capable of generating a stable output with a minimum pulse width of 6.9 ls and maximum repetition rate of 57.01 kHz. The generated pulses are highly stable, with an observed signal-to-noise ratio of * 33 dB. The output of the laser can be tuned over a wavelength range of 18 nm from 1035 to 1053 nm. The Q-switched YDFL would find use in multiple applications ranging from medicine to manufacturing.
关键词： Ytterbium-doped fibre laser,NiO saturable absorber,Q-switching
更新于2025-09-19 17:13:59
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Q-switched and mode-locked erbium-doped fiber laser using gadolinium oxide as saturable absorber
摘要： Q-switched and mode-locked Erbium-doped fiber lasers (EDFLs) were demonstrated using gadolinium oxide (Gd2O3) as a saturable absorber. The Gd2O3 nano-powder was embedded into polyvinyl alcohol (PVA) film and integrated into the EDFL cavity to achieve both lasers. At first, a stable Q-switched laser was realized at a center wavelength of 1564.1 nm. The repetition rate increased from 78 to 90.74 kHz and the pulse width reduced from 5.68 to 4.68 μs as the pump power adjusted within 96.28 to 147.16 mW. The output power increased steadily from 19.3 to 26.4 mW as the pump power was raised from 96.28 to 147.16 mW. The slope efficiency of the output power was 14%. Later, a 100 m single mode fiber was incorporated into the similar laser cavity to generate a stable mode-locked laser at a threshold pump power of 96.28 mW with a central wavelength of 1561.5 nm. We observed a stable repetition rate of 1.907 MHz with a pulse width of 3.82 ps as the pump power raised from 96.28 to 147.16 mW. The peak power obtained from the mode-locked laser was tunable from 1.78 to 2.58 kW as the pump power was adjusted from minimum to the maximum. These results indicate the outstanding performance of Gd2O3 SA for both Q-switching and mode-locking applications. The lasers are useful for various applications including, micromachining of material, frequency comb-generation and remote sensing.
关键词： Mode-locking,Passive saturable absorber,Q-switching
更新于2025-09-19 17:13:59
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Numerical Investigation of the Impact of the Saturable Absorber Recovery Time on the Mode-locking Performance of Fiber Lasers
摘要： We investigated the impact of the recovery time of a saturable absorber (SA) on the mode-locking performance of a fiber laser. This study was conducted for two types of fiber cavities with different net cavity group velocity dispersion (GVD) at a wavelength of 1.55 μm: normal and anomalous. The impact of modulation depth variation was also analyzed. It was found that the recovery time of the SA has little influence on the output pulse characteristics in the case of the anomalous net cavity GVD due to an interplay between saturable absorption-induced pulse shaping and modulation instability-induced soliton evolution, irrespective of the SA operating in the fast or slow saturable absorption regime. However, the recovery time was found to have a significant impact on the output pulse characteristics for the case of a normal net cavity GVD. An SA operating in the fast saturable absorption regime produces mode-locked pulses with symmetric temporal shapes for the normal GVD cavity, whereas asymmetric pulses are generated in the slow saturable absorption regime. From the simulation results, the optimum recovery time range for fiber laser mode-locking is discussed.
关键词： Fiber lasers,cavity dispersion,mode-locking,saturable absorber
更新于2025-09-19 17:13:59
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Effect of recovery time of nonlinear absorber saturated losses on the soliton pulse structure in a fibre laser with different cavity lengths
摘要： Using numerical simulation methods, we have calculated the dependences of the pulse profile and spectrum of a ring fibre laser in the region of anomalous group velocity dispersion on the length of the laser cavity and the recovery time of the nonlinear absorber saturated losses. It is found that with increasing cavity length the laser pulse acquires a pedestal, the positions of its edges corresponding to the frequencies of the Kelly sidebands. It is shown that the finiteness of the recovery time of the saturable absorber leads to an asymmetry in the profile and spectrum of the laser pulse.
关键词： recovery time,saturable losses,Kelly sidebands,soliton fibre laser,nonlinear saturable absorber
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) - A Passively Mode-locked Tm-doped Fiber Laser Based on PbS Nanoparticles as Saturable Absorber
摘要： A passively mode-locked Tm-doped fiber laser was experimentally achieved by using PbS nanoparticles as a saturable absorber (SA), for the first time. The laser delivers stable conventional solitons with pulse duration of 1.24 ps at the repetition rate of 21.93 MHz. The centered wavelength and 3-dB bandwidth are 1957.37 nm and 3.43 nm, respectively. The high signal noise ratio of 61 dB indicates the good stability of the mode-locking. By further increasing pump power, the laser switches into stable second harmonic mode-locked regime. In this state, the average output power of 9.06 mW and repetition rate of 43.86 MHz are obtained. The results reveal that PbS is a type of promising SA for 2 μm ultra-short pulse generation.
关键词： passively mode-locking,PbS nanoparticles,saturable absorber,Tm-doped fiber laser
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Colombian Conference on Communications and Computing (COLCOM) - Barranquilla, Colombia (2019.6.5-2019.6.7)] 2019 IEEE Colombian Conference on Communications and Computing (COLCOM) - Ultrashort Pulse Generation in EDFL Cavities using Graphene as Saturable Absorber for applications in optical communications systems
摘要： Graphene and 2D materials are being used in the design of light sources due to their wide absorption spectrum, ultrafast recovery time and high modulation depth. In this work, we present a experimental design of an modelocking Erbium-Doped-Fiber-Laser (EDFL) that uses graphene deposited onto D-shaped optical fiber, acting as a saturable absorber, in order to generate ultra-short pulses in an important region for optical communications: 1558.5 nm. To best of our knowledge, this is the first ultrashort pulses laser designed an experimentally validated in Colombia. The results shows a pulsed laser with a repetition rate of 33.3 MHz and a spectral width of 10 nm.
关键词： Saturable absorber,Graphene,Erbium-doped-fiber-laser,Mode-locking,D-shaped Optical fiber,Ultrashort pulses
更新于2025-09-16 10:30:52
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Q-Switched Fiber Laser at 1.5 μm Region using Ti3AlC2 MAX Phase-Based Saturable Absorber
摘要： A Ti3AlC2 MAX phase-based saturable absorber (SA) is successfully demonstrated to induce passive Q-switching in an erbium-doped fiber laser (EDFL) at the 1.5 μm region. The Ti3AlC2-PVA film is fabricated using the solution casting method, and incorporated into the laser cavity which uses a 0.89 m long erbium doped fiber as the gain medium. Stable and self-starting Q-switched laser pulses are observed above a threshold pump power of 87.81 mW at a central wavelength of 1567.4 nm. The repetition rate is observed to increase from 24.07?kHz to 46.3?kHz while the corresponding pulse width decreases from 5.0 μs to 0.99 μs over a pump power range of 108.9 mW to 244.5 mW. At the maximum pump power of 244.5 mW, the highest pulse energy of 102.7 nJ and the maximum output power of 4.75 mW are obtained. These findings demonstrated the feasibility of the Ti3AlC2 MAX phase as an SA material with significant promise for photonic applications. This is also, to the best knowledge of the authors, the first report of a Ti3AlC2 MAX phase-based SA for inducing passive Q-switching in an EDFL.
关键词： Q-switched,Ti3AlC2,MAX Phase,Saturable Absorber
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
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Optically Modulated Tunable O-Band Praseodymium-Doped Fluoride Fiber Laser Utilizing Multi-Walled Carbon Nanotube Saturable Absorber <sup>*</sup>
摘要： A tunable and optically modulated fiber laser utilizing a multi-walled carbon nanotube based saturable absorber is demonstrated for operation in the O-band region. A praseodymium-doped fluoride fiber is used as the gain medium and the system is capable of generating modulated outputs at 1300 nm. Pulsed output is observed at pump powers of 511 mW and above, with repetition rates and pulse widths that can be tuned from 41 kHz and 3.4 ??s to 48 kHz and 2.4 ??s, respectively, at the maximum pump power available. A maximum average output power of 100 ??W with a corresponding single pulse energy of 2.1 nJ is measured, while the tunability of the proposed laser is from 1290 nm to 1308 nm. The output is stable, with peak power fluctuations of ～4 dB from the average value.
关键词： tunable fiber laser,O-band,praseodymium-doped fluoride fiber,multi-walled carbon nanotube,saturable absorber
更新于2025-09-16 10:30:52