Stable multiwavelength thulium fiber laser assisted by four wave mixing effect

Al-Alimi, A. W.; Bakar, M. H. Abu; Abas, Ahmad Fauzi; Alresheedi, Mohammed T.; Abidin, N.H. Zainol; Mahdi, Mohd Adzir

doi:10.1016/j.optlastec.2018.03.030

Cited by 23 publications

(7 citation statements)

References 27 publications

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“…High power linearly polarized all-fiber lasers or MOPAs with narrow linewidth and near diffraction limited beam quality have important applications for nonlinear frequency conversion [1], spectral beam combining (SBC) [2]- [5] and coherent beam combining (CBC) [6]- [8]. However, nonlinear effects (NLE) such as SBS [9], four-wave-mixing (FWM) [10], [11] and mode instability (MI) [12] effects have limited the power scaling of this type of narrow linewidth fiber laser systems. Over the past decade, several methods were employed in these systems for NLE and MI suppression.…”

Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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As a major limitation for power scaling of high power narrow linewidth fiber master oscillator power amplifiers (MOPAs), Stimulated Brillouin Scattering (SBS) induced selfpulsing in polarization maintaining (PM) fiber amplifiers is well characterized and analyzed in this paper by comparing different white noise signal (WNS) phase-modulated modes in experiments. It is found that the self-pulsing effect is not observed in the PM-amplifier with single-frequency laser seed injection, and cascaded WNS modulation provides superior self-pulsing suppression than single WNS modulation with similar output linewidth. Moreover, the experimental results indicate that the self-pulsing threshold can hardly be predicted only by the output linewidth or the defined SBS threshold in a WNS phase modulated fiber amplifier system. As self-pulsing is originated from the spectral spikes in WNS modulated system, we theoretically analyzed characteristics of these spikes in different phase-modulation modes. It indicates the spectral peak intensity can be reduced by cascaded modulation, for which self-pulsing can be suppressed. The theoretical predictions agree well with the experimental results. At the same time, in order to suppress the mode instability effect, a plum blossom shaped bending mode selection device is used in this high-power narrow linewidth fiber amplifier system. Finally, a 32 GHz cascaded WNSs modulated, over than 2.5 kW linearly polarized all-fiber amplifier with a slope efficiency of 86.7% is demonstrated. The polarization extinction ratio (PER) is measured larger than 14 dB and the beam quality factor M 2 maintains lower than 1.3 in the power scaling process.

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Section: Introductionmentioning

confidence: 99%

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Feng

Chang

et al. 2020

IEEE Photonics J.

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“…According to the previous research, the fiber amplifier based on FO seed has obvious spectral broadening due to FWM and SPM [34][35][36]. And it also has a serious SRS effect because of the temporal instability of the FO seed [37,38].…”

Section: Introductionmentioning

confidence: 99%

Influence of injected signal polarization on SBS, SRS, spectral broadening, and self-pulsing properties in high-power fiber amplifier

Wang¹,

Peng²,

Feng³

et al. 2022

Laser Phys. Lett.

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In this paper, we construct a narrow-linewidth amplifier based on polarization-maintaining (PM) fiber, which can be injected by a fiber oscillator seed or white noise signal phase-modulated seed. The stimulated Brillouin scattering (SBS), SRS, spectral broadening, self-pulsing properties of the fiber amplifier when its’ injected signal is 0° or 45° relative to the slow axes of the PM fiber are studied. It is indicated that when the injected signal is launched at 45° relative to the slow axes, the nonlinear effects are significantly suppressed compared with the case of the injected signal is launched parallel to the slow axis. The spectral broadening rate is reduced from 0.14 pm W−1 to 0.0747 pm W−1, the ratio of Raman to laser peak intensity is increased from 20 dB to 30 dB, the SBS threshold is increased by >24%, and the self-pulsing threshold is increased by 28.7%. It is worth noting that the nonlinear properties corresponding to the injected polarization state in our experiment are quite different from some earlier works.

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“…Therefore, it is necessary to introduce the technology of suppressing mode competition to achieve stable multi-wavelength laser output. Now, there are many methods to alleviate the uniform broadening effect of EDF, such as using the four-wave mixing effect 23 or introducing intensity-dependent loss (IDL) mechanism through nonlinear polarization rotation effect 24 and nonlinear optical loop mirror (NOLM). 25 Saleh et al use the four-wave mixing effect in highly nonlinear fiber to achieve a stable multi-wavelength random laser, where the comb spectrum is generated by the Sagnac ring filter.…”

Section: Introductionmentioning

confidence: 99%

Tunable and switchable multi-wavelength random fiber laser based on random distributed feedback and improved Lyot filter

Qi,

Zhou,

Zhang

et al. 2024

Opt. Eng.

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A tunable and switchable multi-wavelength random fiber laser (MW-RFL) is proposed and experimentally demonstrated in this work, which consists of a random distributed feedback mechanism, an improved Lyot filter, and a nonlinear optical loop mirror (NOLM). The theoretical derivation and simulation analysis of the improved Lyot filter are carried out by using the transfer matrix theory. The results show that by adjusting the polarization controller (PC) in the filter, not only the channel interval can be switched between 0.9 and 0.45 nm, but also the extinction ratio (ER) of the transmission spectrum can be adjusted and the wave peak position can be moved. The feedback mechanism of the proposed laser is provided by the randomly distributed backward Rayleigh scattering generated in the single-mode fiber. By changing the pump laser power, the number of output laser channels will be linearly increased. When the channel interval is kept constant, the wavelength can be tuned within a certain range by carefully adjusting the PC3 in the NOLM. When the channel interval of the spectrum is 0.9 nm, the wavelength tuning ranges of the three and four laser channels are 3.6 and 3.5 nm, respectively. When the channel interval of the spectrum is 0.45 nm, the wavelength tuning ranges of the three and four laser channels are 2.8 and 2.77 nm, respectively. Then the variations of the output spectrum when using 25 km single-mode fiber (SMF) are studied. It is observed that the linewidth and side mode suppression ratio (SMSR) of the laser channel are significantly increased. Finally, the stability of the random laser is discussed, and the maximum central wavelength drift and peak power fluctuation measured at room temperature are 0.05 nm and 0.34 dB, respectively. The average peak power and SMSR are maintained at −4.47 dBm and 34.6 dB, respectively, which confirms that the laser has good stability.

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Stable multiwavelength thulium fiber laser assisted by four wave mixing effect

Cited by 23 publications

References 27 publications

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

2.5 kW Narrow Linewidth Linearly Polarized All-Fiber MOPA With Cascaded Phase-Modulation to Suppress SBS Induced Self-Pulsing

Influence of injected signal polarization on SBS, SRS, spectral broadening, and self-pulsing properties in high-power fiber amplifier

Tunable and switchable multi-wavelength random fiber laser based on random distributed feedback and improved Lyot filter

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