Experimental investigation of polarization-imbalanced nonlinear loop mirror with double-sense twisted fiber as a filter to clean up solitons

Rodríguez-Morales, L. A.; Armas-Rivera, I.; Avazpour, Mahrokh; Santiago-Hernández, H.; Ibarra-Escamilla, B.; Durán-Sánchez, M.; Pottiez, O.; Kuzin, E. A.

doi:10.1088/2040-8986/aa9af8

Cited by 19 publications

(11 citation statements)

References 30 publications

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“…When the fiber is twisted, circular birefringence is induced, a wavelength dependence appears, creating a spectral filtering effect as experimentally shown in [32]. Double-pass propagation with the same twist ratio and the same fiber length in both directions ensure that this circular birefringence effect is mitigated [30].…”

Section: Methodsmentioning

confidence: 86%

Sub-200-kHz single soliton generation in a long ring Er-fiber laser with strict polarization control by using twisted fiber

Rodríguez-Morales

Ibarra-Escamilla

Armas-Rivera

et al. 2020

Optics & Laser Technology

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In the present work we demonstrate a novel single-soliton ultra-low pulse repetition frequency passively modelocked erbium-doped fiber laser. We mitigate the residual linear birefringence of fiber by fiber twist to achieve a strict control of polarization. For mode-locking the nonlinear polarization rotation (NPR) was used. Special technique was applied to reduce the overdriving of NPR that allows the generation of single soliton in ultra-long cavity. The strict control of polarization yields a stable relation between the polarization state of the pulses propagating in the cavity and the regimes of generation. A 192.12-kHz train of soliton pulses was obtained with pulse duration of 4.7 ps at 1560.1 nm, the average power was 29 μW and the estimated peak power was ̴ 30.8 W with an energy of 150.9 pJ.

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Section: Methodsmentioning

confidence: 86%

Sub-200-kHz single soliton generation in a long ring Er-fiber laser with strict polarization control by using twisted fiber

Rodríguez-Morales

Ibarra-Escamilla

Armas-Rivera

et al. 2020

Optics & Laser Technology

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“…1, before the output coupler. The spectrum is centered at 1550 nm and has a full width at half- The amplitude of Kelly's sidebands could vary, changing dissipative terms and the spectral filtering [20,21]. The temporal profile is shown in Fig.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

“…The twisted fiber in the cavity is used to maintain constant ellipticity during propagation. Recently, some investigations have shown that it is possible to mitigate the linear birefringence and even the circular birefringence produced by the twist of the fiber allowing the total control of the light polarization no matter the environmental conditions [20]. Finally, a polarization beam splitter (PBS) is used as a polarizer.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…are the first and second-order dispersion coefficients, ∆β is the linear birefringence, α is a linear loss and γ is the nonlinear coefficient in both Eqs. (3) and ( 4), the linear and circular birefringence effects are misprized because of the fiber is considered a bi-twist fiber [20]. The value of the coefficients used for the delay line is shown in Table I.…”

Section: Theoretical Modelmentioning

confidence: 99%

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Numerical study of the polarization proprieties in a ring cavity with total polarization control

Morales

Armas-Rivera

Durán-Sánchez

et al. 2021

Supl. Rev. Mex. Fis.

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We report the numerical study of the polarization properties of a net anomalous dispersion ring cavity with total polarization control. As a mode locker, we use the nonlinear polarization rotation (NPR) method. The initial ellipticity and azimuth were fixed to 13° and 0°, respectively. The simulations, made by the split-step Fourier method, show changes in polarization with respect to initial conditions, after the mode-lock process such as previously reported in the literature. It was found that polarization changes are caused by non-linear birefringence. The pulsed laser produces solitonic pulses with 0.4 ps FWHM and 240 W peak power.

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“…The fibers were twisted with a twist rate of 7 turns/m and wounded on a 50-cm diameter cylinder. Previously we used the same technique for the design of a nonlinear optical loop mirror (NOLM), see [22] where the details of the twisted fiber characterization can be found. A 50/50 coupler, a polarizer, and an in-line polarization controller (PC1, model PLC-900-Thorlabs) close the ring cavity.…”

mentioning

confidence: 99%

Long cavity ring fiber mode-locked laser with decreased net value of nonlinear polarization rotation

Rodríguez-Morales¹,

Armas-Rivera²,

Ibarra-Escamilla³

et al. 2019

Opt. Express

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We investigate a new configuration of a mode-locked fiber laser by using a nonlinear polarization rotation-based design to generate soliton pulses with low repetition rate. Unlike with previously reported configurations, we introduce a Faraday mirror after the first half of the cavity length to counteract the nonlinear polarization rotation effects. The total cavity length is 437 m including a 400-m long twisted SMF-28 fiber. The fiber was twisted to cancel the linear birefringence and to ensure that the polarization ellipticity is not altered as the pulse travels along the fiber. The strict control of polarization yields a stable relation between the polarization state of the pulses propagating in the cavity and the regimes of generation. Depending on the polarization state we observed three different emission regimes, the single soliton regime (SR), conventional noise-like pulses (NLP) and noise-like square-waveform pulse (NLSWP). In the SR, a 467.2 kHz train of solitons was obtained with pulse duration of 2.9 ps at 1558.7 nm. IntroductionUltrafast lasers have attracted significant interest due to their potential for applications like surgery [1], high-precision micromachining [2] and multiphoton microscopy (MPM) [3]. In the last case the fiber soliton sources can be especially useful because of their capacity of generating ultrashort pulses in the wavelength range from 1530 nm to 2000 nm using Er, Tm, Ho doped fibers and the effect of soliton self-frequency shift [4]. A high-repetition train of ultrashort pulses causes the effect of thermal accumulation [5,6] which can be beneficial in some cases, however it is undesirable for applications such as MPM. The repetition rate can be reduced by using pulse pickers such as Pockels cells or acousto-optic modulators, however this method is energetically inefficient and increases the complexity of the setup. Because the repetition rate of a mode-locked laser is inversely proportional to its resonator length, the repetition rate can be reduced simply by lengthening the cavity. In contrast to solid-state lasers, which require critical alignment, fiber lasers are more prone to achieve lower repetition rates with the convenience and simplicity of elongating a fiber cavity.The long cavity lasers were studied mainly with the purpose to increase the pulse energy in the configurations with net-normal dispersion. For example, Kobtsev et al. [7]

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Experimental investigation of polarization-imbalanced nonlinear loop mirror with double-sense twisted fiber as a filter to clean up solitons

Cited by 19 publications

References 30 publications

Sub-200-kHz single soliton generation in a long ring Er-fiber laser with strict polarization control by using twisted fiber

Sub-200-kHz single soliton generation in a long ring Er-fiber laser with strict polarization control by using twisted fiber

Numerical study of the polarization proprieties in a ring cavity with total polarization control

Long cavity ring fiber mode-locked laser with decreased net value of nonlinear polarization rotation

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