Switchable L-band dual-wavelength dark–bright pulse pair generation from an Er-doped mode-locked fiber laser with SMF–GIMF–SMF as the saturable absorber

Liu, Mengyuan; Qi, Yaoyao; Yang, Song; Bai, Zhenxu; Yan, Bingzheng; Ding, Jie; Wang, Yulei; Lü, Zhiwei

doi:10.1007/s00340-022-07913-9

Cited by 6 publications

(1 citation statement)

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“…In 2021, an innovative hybrid structure composed of GIMF and graphene for stable optical pulses was reported by Li X et al [22]. Moreover, some fascinating mode-locking phenomena in SMSbased mode-locked fiber lasers were observed, such as noise-like pulses [23], Q-switched mode-locking patterns [24], different bound solitons [20,25] and multi-wavelength modelocking patterns [26]. These experimental results profoundly facilitate the development and application of GIMFs as SAs in ultrafast fiber lasers.…”

Section: Introductionmentioning

confidence: 99%

Generation and Dynamics of Multiple Pulses in an Ultrafast Fiber Laser with a Single-Mode Fiber–Graded-Index Multimode Fiber–Single-Mode Fiber-Based Saturable Absorber

Yang,

Zeng,

Yang

et al. 2024

Photonics

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In this study, we have investigated the evolution process and dynamic characteristics of a multi-pulse regime in an erbium-doped fiber ring laser based on a single-mode fiber–graded-index multimode fiber–single-mode fiber (SMF-GIMF-SMF) structure as an optical modulator. By utilizing the excellent nonlinear optical absorption of the SMF-GIMF-SMF (SMS) device with a modulation depth of ~8.68%, stable single-pulse mode locking at the frequency of 9.84 MHz can be readily observed at low pump power. In addition, the single-pulse operation can evolve into a multiple-pulse regime on account of the peak-power-clamping effect via suitably raising the pump power and carefully regulating the polarization state. Further, the single-shot temporal evolution of multiple pulses is monitored, indicating that this state shows unique and interesting temporal characteristics with variable pulse separations and inconsistent pulse intensities, which, as far as we know, is the first such observation in ultrafast fiber lasers. Additionally, this study, based on the time-stretch dispersive Fourier transformation method, suggests that these multiple pulses consist of chaotic wave envelopes with erratic intensities and changeable pulse energy. We believe that these findings have profound implications for revealing fascinating nonlinear pulse dynamics in ultrafast fiber optics.

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