Search query: Dissipative soliton trapping in normal dispersion-fiber lasers

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abstract: We report on the dissipative soliton (DS) trapping in a fiber ring laser mode locked with a semiconductor saturable absorber mirror and operated in normal dispersion regime. It was shown that despite the fact that a DS is strongly frequency chirped, two DSs formed along the two orthogonal polarization directions of a birefringent cavity fiber laser can incoherently couple and travel with the same group velocity in the laser. Numerical simulations have well confirmed the experimental observations.
author_names: L M Zhao

D Y Tang

X Wu

Han Zhang
title: Dissipative soliton trapping in normal dispersion fiber lasers.
venue: Optics letters
year: 2010

abstract: Rapid progress in real time spectroscopy uncovers the spatio spectral scenarios of ultrashort pulses in dissipative systems. Varieties of transient soliton dynamics on different timescales have been revealed. Here, we report on an experimental observation of stationary and pulsating vector dissipative solitons in a nonlinear multimode interference (NL MMI) based fiber laser with net normal dispersion. Polarization non discrimination of the NL MMI mode locking facilitates the dissipative soliton trapping process. Two orthogonally polarized components are coupled together through oppositely shifting their central frequencies to form the group velocity locked vector dissipative solitons (GVLVDSs) Dispersive Fourier transform (DFT) based polarization resolved measurement enables insights into the transient polarization dynamics and the long term evolution. Particularly, both stationary and pulsating GVLVDSs are obtained with appropriate parameter settings. It is found that the quasi stationary pulsating manner is accompanied with recurrent spectral breathing and energy oscillation; the two orthogonally polarized components possess synchronous pulsating manners due to the cross phase modulation induced trapping mechanism and the similar formation process. Additionally, chaotic pulsation is also captured in sense that the spectra cannot recover to their original profiles despite of the harmonic energy oscillation. All these findings can enhance our understanding towards soliton pulsation with the freedom of vectorial degree.
author_names: Yiyang Luo

Yang Xiang

Perry Ping Shum

Yusong Liu

Ran Xia

Wenjun Ni

Huy Quoc Lam

Qizhen Sun

Xiahui Tang
title: Stationary and pulsating vector dissipative solitons in nonlinear multimode interference based fiber lasers.
venue: Optics express
year: 2020

abstract: Abstract In this article, the peak power expression of dissipative soliton resonance (DSR) pulse is derived, in a normal dispersion fiber laser, by using the equation for the resonance curve and the relationship between the parameters of cubic quintic complex Ginzburg Landau (CGLQ) equation and the cavity parameters. According to the peak power expression, the peak power of DSR pulses is inversely proportional to the average dispersion and the square of the gain bandwidth, is proportional to the square of the saturation power. That is to say, we can improve the peak power of DSR pulse in three ways: Firstly, increase the saturation power in the case of sinusoidal saturable absorber transmission curve; secondly, decrease the gain bandwidth properly; thirdly, decrease the average dispersion suitably. In addition, the further results of numerical simulations are obtained by using pulse tracing technique, which are in good agreement with the theoretical derivation of peak power of DSR pulses. This means that our work can serve as a guideline to design high peak power DSR fiber laser.
author_names: Chuyan Liu

Qianchao Wu

Yong Yao

Chonghao Wu

Yaping Gan

Yanping Fu

Yanfu Yang

Jiajun Tian

Ke Xu
title: Numerical research on the dissipative soliton resonance peak power in normal dispersion fiber lasers
year: 2020

abstract: Internal polarization dynamics of vector dissipative soliton resonance (DSR) pulses in a mode locked fiber laser are investigated. By utilizing a wave plate analyzer configuration to analyze the special structure of a DSR pulse, we find that polarization state is not uniform across a resonant dissipative soliton. Specifically, although the central plane wave of the resonant dissipative soliton acquires nearly a single fixed polarization, the dissipative fronts feature polarization states that are different and spatially varying. This distinct polarization distribution is maintained while the whole soliton extends with increasing gain. Numerical simulation further confirms the experimental observations.
author_names: Daojing Li

Deyuan Shen

Lei Li

Dingyuan Tang

Lei Su

Luming Zhao
title: Internal polarization dynamics of vector dissipative soliton resonance pulses in normal dispersion fiber lasers.
venue: Optics letters
year: 2018

abstract: We report on an all normal dispersion Yb doped fiber laser with mode locking mechanism based on nonlinear polarization rotation. The splitting and trapping of dissipative solitons (DSs) could be observed by inserting of a short section of polarization maintaining fiber in cavity configuration as an in line birefringence fiber filter. Two trapped orthogonal polarization DSs can travel with the same group velocity in the laser cavity. With the DSs trapping, the polarization sidebands are appeared in the spectrum. The trapping of DSs and sideband generation is numerically simulated as well.
author_names: Zhongwei Xu

Xing Luo

Kuan Fu

Luyun Yang

Haiqing Li

Jinyan Li
title: Dissipative Soliton Trapping in an All Normal Dispersion Mode Locked Yb Doped Fiber Laser
venue: IEEE Photonics Technology Letters
year: 2017

abstract: Numerical simulations on dissipative soliton resonance generation in an all normal dispersion fiber ring laser are presented. Situations with monotonic and periodical saturable absorption are both considered. The multipulse operation in dissipative soliton laser is found to be caused by the spectral filtering effect that limits the spectral maximum width, and the multipulsing can be fully circumvent by inducing strong peak power clamping effect of a sinusoidal saturable absorber in the cavity. When the cavity peak power clamping effect is strong enough that the pulse peak power and the pulse spectral width are both confined at a low value, the spectral filtering effect induced multipulse operation is prevented and the dissipative soliton resonance is generated. Otherwise, the spectral filtering effect causes pulse breaking before the pulse peak power reaches the saturation point. Further results show that under the dissipative soliton resonance, the generated pulse peak power can be directly controlled by the cavity peak power clamping effect, which is determined by the saturation power of the saturable absorber.
author_names: Daojing Li

Dingyuan Tang

Luming Zhao

Deyuan Shen
title: Mechanism of Dissipative Soliton Resonance Generation in Passively Mode Locked All Normal Dispersion Fiber Lasers
venue: Journal of Lightwave Technology
year: 2015

abstract: In this paper, we propose a photonic crystal fiber with broadband ultra flattened normal dispersion at 2 mm. In this fiber, a subwavelength air hole in the core region and air holes arrangement in the cladding region are used to control the property of dispersion. With optimized design, the dispersion of the proposed ultra flattened normal dispersion fiber (UNDF) can be kept within 72.4 to 73.15 ps*nm 1km 1 from 1750 to 2350 nm wavelength. Benefiting from this advantage, the fiber shows great potential in the applications of coherent supercontinuum (SC) generation and dissipative soliton resonance (DSR) generation in thulium doped fiber lasers. According to our investigation, coherent SC with 10 dB bandwidth of 238 nm can be obtained by using 50 cm UNDF. Furthermore, by constructing a UNDF based nonlinear optical loop mirror as a saturable absorber, we specifically investigate the field evolution from dissipative soliton to DSR in passively mode locked lasers. The proposed UNDF can be a key component for various laser sources in a 2 mm band.
author_names: Tianye Huang

Qian Wei

Zhichao Wu

Xu Wu

Pan Huang

Zhuo Cheng

Perry Ping Shum
title: Ultra Flattened Normal Dispersion Fiber for Supercontinuum and Dissipative Soliton Resonance Generation at 2 mm
venue: IEEE Photonics Journal
year: 2019

abstract: We numerically investigated the compressibility of dissipative soliton pulses in an all normal dispersion fiber laser which was mode locked with a nonlinear optical loop mirror. A transition state within the area between the traditional dissipative soliton regime and dissipative soliton resonance regime was revealed to have much higher dechirped peak power and shorter dechirped pulse duration than its vicinity. This phenomenon is reported for the first time to the best of our knowledge. The peak power and pulse width of the dechirped pulse were calculated using the linear compression method. The dynamics and the distribution of the transition state were systematically analyzed in laser parameter spaces. The nonlinear frequency chirp was mainly induced by self phase modulation and the pulse formation mechanism, which influenced the linear compressibility of the dissipative. We demonstrated that there were optimal filter bandwidth values corresponding to the best pulse compressibility under different laser parameters. The simulation results indicate that dechirped pulses with a pulse peak power of 0.5 1 MW, a pulse duration of the 100 fs level, and a pulse energy of ~100 nJ can be obtained using the optimal parameters.
author_names: Jun-Hao Cai

He Chen

Sheng-Ping Chen

Jing Hou
title: Compressibility of Dissipative Solitons in Mode Locked All Normal Dispersion Fiber Lasers
venue: Journal of Lightwave Technology
year: 2018

abstract: Multiple dissipative soliton operation is numerically found to be caused by the spectral filtering effect. Strong peak power clamping effect is required for the dissipative soliton resonance generation. The peak power is controlled by the cavity peak power clamping effect.
author_names: D J Li

L M Zhao

D Y Tang

Deyuan Shen
title: Dissipative soliton resonance in all normal dispersion fiber lasers
venue: 2015 11th Conference on Lasers and Electro Optics Pacific Rim (CLEO PR)
year: 2015

abstract: We report on the generation of dispersion managed dissipative soliton and various structural soliton molecules from a slight normal dispersion fiber laser. The laser was capable of generating 56.5 nm broad dissipative solitons with quasi rectangular spectral profile. Furthermore, the broadest top flat spectrum with up to 71.4 nm bandwidth was achieved in the noise like pulse regime, operating in the 1542 1613.4 nm. More importantly, by manipulating the laser cavity parameters, various types of soliton molecules, including conventional and unusual structural soliton molecules, were observed in fiber laser. The soliton molecules exhibit different features in autocorrelation traces, which are found to be related to soliton number, soliton intensity and soliton separation within the soliton molecules. The results contribute to enriching the soliton dynamics in the fiber lasers in the slight normal dispersion regime.
author_names: Xu-De Wang

Mengqiu Sun

Simin Yang

Jie-Yu Pan

Suwen Li
title: Broadband Dispersion Managed Dissipative Soliton and Structural Soliton Molecules in a Slight Normal Dispersion Fiber Laser
venue: IEEE Photonics Journal
year: 2020