Large amplitude noise reduction in ultrashort pulse trains using a power-symmetric nonlinear optical loop mirror

Pottiez, O.; Ibarra-Escamilla, B.; Kuzin, E. A.

doi:10.1016/j.optlastec.2008.09.001

Cited by 7 publications

(5 citation statements)

References 39 publications

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“…In order to compensate for the residual fibre birefringence and obtain an isotropic behaviour [24], a moderate twist of 2 turns/m is considered. Assuming that the fibre is wound on a spool with a radius of curvature of at least 30 cm, calculations suggest that this twist is sufficient to nearly suppress the effects of linear birefringence, whereas it remains small enough to avoid pulse distortion [29]. It has to be noted that the isotropc behaviour of a twisted fibre has been confirmed experimentally.…”

Section: Numerical Studymentioning

confidence: 96%

“…In this section we study numerically the operation of the proposed scheme in the frame of amplitude regeneration of a WDM signal consisting of two data trains at different wavelengths and presenting different power levels. When both chromatic dispersion and Kerr nonlinearity are at play, one option consists in operating the NOLM in the soliton regime, which was shown to enhance its regeneration capabilities [29]. However, as the device will process two signals with different power levels and variable power ratio, the pulses at both wavelengths propagating in the loop can hardly be close to fundamental solitons simultaneously, so that the soliton regime cannot be exploited in this case.…”

Section: Numerical Studymentioning

confidence: 99%

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Wavelength-dependent nonlinear optical loop mirror for simultaneous amplitude noise reduction at two wavelengths

Pottiez

Ibarra-Escamilla

Kuzin

2013

J. Eur. Opt. Soc.-Rapid Publ.

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We propose and study analytically and numerically a polarisation-imbalanced Nonlinear Optical Loop Mirror (NOLM) scheme exhibiting a wavelength-dependent nonlinear characteristic. The device includes a symmetric coupler, an isotropic (or, in practice, twisted nonpolarisation-maintaining) fibre loop and a section of high birefringence (HiBi) fibre to break the polarisation symmetry. Thanks to the wavelength-dependent phase shift of the HiBi fibre, wavelength-dependent switching is obtained. For proper orientation of the HiBi fibre in the loop plane and using linear input polarisation at 45°with respect to its birefringence axes, the NOLM switching power varies with wavelength, whereas its zero low-power transmission and 100% maximal transmission are constant. Through slight adjustments of the HiBi fibre birefringence, which can be realised mechanically or thermally, the ratio between switching powers at two particular wavelengths can be readily adjusted. We show numerically that this scheme can be applied to simultaneous amplitude regeneration of two wavelength channels exhibiting uneven power levels.

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Section: Numerical Studymentioning

confidence: 96%

Section: Numerical Studymentioning

confidence: 99%

Wavelength-dependent nonlinear optical loop mirror for simultaneous amplitude noise reduction at two wavelengths

Pottiez

Ibarra-Escamilla

Kuzin

2013

J. Eur. Opt. Soc.-Rapid Publ.

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“…In the HNLF, the SPM and cross-phase modulation (XPM) effects occur contributing to the nonlinear phase shift of the counter-propagating fields [14,15], and the former effect is involved in the following discussion, performing the SPM-NOLM. The expressions of the above-mentioned optical fields can be derived as follows [16][17][18]: The expressions of the above-mentioned optical fields can be derived as follows [16][17][18]:…”

Section: Normalized Power Transfer Function Of Single Nolmmentioning

confidence: 99%

Cascaded Nonlinear-Optical Loop Mirror-Based All-Optical PAM Regenerator

Guo

Wen

et al. 2019

Applied Sciences

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An all-optical regeneration scheme based on cascaded nonlinear-optical loop mirrors (NOLMs) for pulse amplitude modulation (PAM) signals is proposed. The optimal working point (WP) of every NOLM can be set by means of the normalized power transfer function (NPTF) and normalized differential gain (NDG). As examples, the PAM-4 and PAM-8 regenerations based on cascaded two-NOLMs are demonstrated by optimizing the splitting ratios of the optical couplers and the gain coefficient of the inter-stage matching amplifier, achieving the Q-factor improvements of 25.32dB and 21.18dB, respectively. Compared to the conventional regenerator scheme, a 1.69dB signal-to-noise ratio (SNR) gain is achieved due to the flat power response within the regenerative range.

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“…[12][13][14]. The flexibility and robustness of such NOLM-based devices with strict polarization control allowed envisioning their use in optical transmission and data processing systems to perform a wide range of essential operations including pedestal removal, all-optical signal regeneration [15][16][17][18][19], even at various wavelengths simultaneously for WDM systems [20] or in the case of complex, multilevel modulation formats (constellations) [21], wavelength conversion for OTDM systems [22], as well as all-optical logic gates [14]. Other noticeable uses of the PI-NOLM include the determination of the temporal profile of ultrashort optical pulses [23], as well as estimating the amplitude statistics of a bunch of optical pulses [24,25], which provided in particular one of the first experimental pieces of evidence of the emergence of ultrashort extreme events (optical rogue waves, ORWs) in noise-like pulses (NLPs) [25].…”

Section: Introductionmentioning

confidence: 99%

Complex dynamics of passively mode-locked fiber lasers with strict polarization control

Pottiez¹,

Bracamontes-Rodríguez²,

Lauterio-Cruz³

et al. 2021

Supl. Rev. Mex. Fis.

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In this work we browse an overview of the complex dynamics that arise in the non-stationary modes of operation of partly mode-locked fiber lasers under strict polarization control. Both ring and figure-eight cavities implementing saturable absorber mechanisms that rely on nonlinear polarization rotation were considered. The use of twisted fiber ensures robust operation, whereas precise polarization adjustments allow tailoring the nonlinear switching characteristic in a clear and repeatable manner. The enhanced flexibility of these sources allowed identifying and studying a broad spectrum of peculiar dynamics, in particular by implementing the temporal and spectral mapping techniques. These include the emergence, fusion, splitting, complex evolution and eventual decay of chaotic bunches of radiation, which are also subject to large spectral shifts, ample quasi-periodic instabilities, extreme-intensity events or the creation of solitons, among others, as well as the complex evolution of massively multiple soliton states. Finally, with the help of numerical simulation, several aspects of the physics underlying these puzzling behaviors could be elucidated.

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Large amplitude noise reduction in ultrashort pulse trains using a power-symmetric nonlinear optical loop mirror

Cited by 7 publications

References 39 publications

Wavelength-dependent nonlinear optical loop mirror for simultaneous amplitude noise reduction at two wavelengths

Wavelength-dependent nonlinear optical loop mirror for simultaneous amplitude noise reduction at two wavelengths

Cascaded Nonlinear-Optical Loop Mirror-Based All-Optical PAM Regenerator

Complex dynamics of passively mode-locked fiber lasers with strict polarization control

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