Pure-quartic soliton molecules in normal fourth-order dispersion regimes based on spectral filtering effect

doi:10.1088/1674-1056/ada43c

Abstract Recent theoretical verification of self-similar and dissipative pure-quartic solitons (PQSs) emphasized the similarity between PQS lasers and conventional fiber lasers, but the unique equilibrium mechanism hinders the formation of PQS molecules in normal fourth-order dispersion (FOD) regimes. In this paper, we investigated the effect of filters on shaping PQSs in normal FOD based on a passively mode-locked fiber laser model. A bandpass filter eliminates the time pedestal of dissipative PQSs, thus realizing a multi-pulsing state. When the filter bandwidth is appropriate, the effective spectral filtering effect can lower the pulse splitting threshold and enable the coherent restoration from chaotic PQSs to PQS molecules. Additionally, changing the central wavelength of the filter can generate PQSs and PQS molecules with asymmetric intensity distributions. These results are important guides for the manipulation of PQSs and the construction of high repetition-frequency fiber lasers.

Keywords: pure-quartic soliton soliton molecule spectral filtering effect mode-locked fiber laser

Received: 14 November 2024
Revised: 27 December 2024
Accepted manuscript online:

PACS:	42.65.Sf	(Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)
	42.65.Tg	(Optical solitons; nonlinear guided waves)
	42.55.Wd	(Fiber lasers)
	42.60.Fc	(Modulation, tuning, and mode locking)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62175116).

Corresponding Authors: Zu-Xing Zhang
E-mail: zxzhang@njupt.edu.cn

Cite this article:

Han-Yang Shen(申翰阳), Rui-Bo Lan(蓝睿博), Hong-Bin Hu(胡洪彬), Yang Li(李阳), Rui Zhou(周瑞), and Zu-Xing Zhang(张祖兴)† Pure-quartic soliton molecules in normal fourth-order dispersion regimes based on spectral filtering effect 2025 Chin. Phys. B 34 034203

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Pure-quartic soliton molecules in normal fourth-order dispersion regimes based on spectral filtering effect

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