Observation of a high grade of polarization of solitons generated in the process of pulse breakup in a twisted fiber

Flores-Rosas, A.; Peralta-Hernandez, J. I.; Bracamontes-Rodríguez, Y. E.; Villagomez‐Bernabe, Balder; Beltrán-Pérez, G.; Pottiez, O.; Ibarra-Escamilla, B.; Rojas-Laguna, R.; Kuzin, E. A.

doi:10.1364/josab.31.000821

Cited by 13 publications

(9 citation statements)

References 28 publications

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“…The angle 0 on the position of the QWR1 corresponds to linearly polarized signal at the QWR1 output. Taken into account that the ellipticity of the signal at the QWR1 output is equal to the angle of the rotation of QWR1 in the range À45°+ 45° [18]. The maximum ellipticity measured was 35°.…”

Section: Methodsmentioning

confidence: 99%

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Polarization Properties of the Solitons Generated in the Process of Pulse Breakup in Twisted Fiber Pumped by ns Pulses

Rosas¹,

Hernández²,

Arceo³

et al. 2019

Nonlinear Optics - Novel Results in Theory and Applications

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Common optical fibers are randomly birefringent, and solitons formatting and traveling in them are randomly polarized. However, it is desirable to have solitons with a well-defined polarization. With pump relatively long pulses, the nonlinear effects of modulation instability (MI) and stimulated Raman scattering (SRS) are dominant at the initial stage of the process of supercontinuum (SC) generation; modulation instability results in pulse breakup and formation of short pulses that evolve finally to a bunch of solitons and dispersive waves. We do the research of the polarization of solitons formed by the pulse breakup process by the effect of modulation instability with pump pulses of nanoseconds in standard fiber (SMF-28) with circular birefringence introduced by fiber twist, and the twisted fiber mitigates the random linear birefringence. In this work, we found that polarization ellipticity of solitons is distributed randomly; nevertheless, the average polarization ellipticity is closer to the circular than the polarization ellipticity of the input pulse. In the experimental setup. 200 m of SMF-28 fiber twisted by 6 turns/m was used. We used 1 ns pulse to pump the fiber. The results showed that at circular polarization of the input pulse solitons at the fiber output have polarizations close to the circular, while in the fiber without twist, the soliton polarization was random.

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Section: Methodsmentioning

confidence: 99%

“…average output ellipticity is equal to 0.54, and the case for input ellipticity is equal to 0.9, the average output ellipticity is equal to 0.95, see Figure 15 [18].…”

mentioning

confidence: 99%

Polarization Properties of the Solitons Generated in the Process of Pulse Breakup in Twisted Fiber Pumped by ns Pulses

Rosas¹,

Hernández²,

Arceo³

et al. 2019

Nonlinear Optics - Novel Results in Theory and Applications

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“…In order to ensure that the polarization state at the VWR output is maintained, twist was applied to the 10 m section of SMF-28 fibre; indeed, twist mitigates the effects of fibre residual birefringence and induces optical activity, which preserves ellipticity during propagation [50]. Besides, in order to avoid the reintroduction of linear birefringence through curvature, which would substantially alter the ellipticity for too small spool diameters [51], the fibre was coiled on a 50 cm cylinder. Using this setup, precise polarization control could be performed, allowing the observation and proper characterization of a variety of operational modes.…”

Section: Methodsmentioning

confidence: 99%

Soliton formation from a noise-like pulse during extreme events in a fibre ring laser

Pottiez

Ibarra-Villalón

Bracamontes-Rodríguez

et al. 2017

Laser Phys. Lett.

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We study experimentally the interactions between soliton and noise-like pulse (NLP) components in a mode-locked fibre ring laser operating in a hybrid soliton-NLP regime. For proper polarization adjustments, one NLP and multiple packets of solitons coexist in the cavity, at 1530 nm and 1558 nm, respectively. By examining time-domain sequences measured using a 16 GHz real-time oscilloscope, we unveil the process of soliton genesis: they are produced during extreme-intensity episodes affecting the NLP. These extreme events can emerge sporadically, appear in small groups or even form quasi-periodic sequences. Once formed, the wavelength-shifted soliton packet drifts away from the NLP in the dispersive cavity, and eventually vanishes after a variable lifetime. Evidence of the inverse process, through which NLP formation is occasionally seeded by an extreme-intensity event affecting a bunch of solitons, is also provided. The quasi-stationary dynamics described here constitutes an impressive illustration of the connections and interactions between NLPs, extreme events and solitons in passively mode-locked fibre lasers.

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“…Besides, strict polarization control ensures that the transmission function will not drift over the total measurement time, like it usually happens with conventional schemes under slow (e.g., thermally driven) variations of the fiber residual birefringence (proper operation of the technique will suppose, naturally, that the transmission function is precisely known and does not vary over time). Finally, the requirement of a particular input polarization state may limit the range of applicability of the technique (e.g., solitons in a bunch may be differently polarized); on the other hand, the choice of circular input polarization makes sense considering the recent discovery that, in a twisted fiber, solitons tend to be circularly polarized [42,43].…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Characterizing the Statistics of a Bunch of Optical Pulses Using a Nonlinear Optical Loop Mirror

Pottiez

Paez-Aguirre

Santiago-Hernández

et al. 2015

Mathematical Problems in Engineering

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We propose in this work a technique for determining the amplitude distribution of a wave packet containing a large number of short optical pulses with different amplitudes. The technique takes advantage of the fast response of the optical Kerr effect in a fiber nonlinear optical loop mirror (NOLM). Under some assumptions, the statistics of the pulses can be determined from the energy transfer characteristic of the packet through the NOLM, which can be measured with a low-frequency detection setup. The statistical distribution is retrieved numerically by approximating the solution of a system of nonlinear algebraic equations using the least squares method. The technique is demonstrated numerically in the case of a packet of solitons.

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Observation of a high grade of polarization of solitons generated in the process of pulse breakup in a twisted fiber

Abstract: Chacterization of laser generated Lamb waves modes after interaction with a thickness reduction discontinuity using ray tracing theory

Cited by 13 publications

References 28 publications

Polarization Properties of the Solitons Generated in the Process of Pulse Breakup in Twisted Fiber Pumped by ns Pulses

Polarization Properties of the Solitons Generated in the Process of Pulse Breakup in Twisted Fiber Pumped by ns Pulses

Soliton formation from a noise-like pulse during extreme events in a fibre ring laser

Characterizing the Statistics of a Bunch of Optical Pulses Using a Nonlinear Optical Loop Mirror

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