Cascaded higher-order soliton for non-adiabatic pulse compression

Li, Qian; Kutz, J. Nathan; Wai, P.K.A.

doi:10.1364/josab.27.002180

Cited by 50 publications

(30 citation statements)

References 32 publications

(41 reference statements)

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“…In fibre B, the soliton-like pulses are compressed to the fs-range and the OFC broadened. Pulse compression in an amplifying medium can be considered as an alternative technique to the compression in dispersion-decreasing fibres [29][30][31] .…”

Section: Mathematical Modelmentioning

confidence: 99%

Soliton radiation beat analysis of optical pulses generated from two continuous-wave lasers

Zajnulina

Böhm

Blow

et al. 2015

Chaos: An Interdisciplinary Journal of Nonlinear Science

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We propose a fibre-based approach for generation of optical frequency combs (OFC) with the aim of calibration of astronomical spectrographs in the low and medium-resolution range. This approach includes two steps: in the first step, an appropriate state of optical pulses is generated and subsequently moulded in the second step delivering the desired OFC. More precisely, the first step is realised by injection of two continuous-wave (CW) lasers into a conventional single-mode fibre, whereas the second step generates a broad OFC by using the optical solitons generated in step one as initial condition. We investigate the conversion of a bichromatic input wave produced by two initial CW lasers into a train of optical solitons which happens in the fibre used as step one. Especially, we are interested in the soliton content of the pulses created in this fibre. For that, we study different initial conditions (a single cosine-hump, an Akhmediev breather, and a deeply modulated bichromatic wave) by means of Soliton Radiation Beat Analysis and compare the results to draw conclusion about the soliton content of the state generated in the first step. In case of a deeply modulated bichromatic wave, we observed the formation of a collective soliton crystal for low input powers and the appearance of separated solitons for high input powers. An intermediate state showing the features of both, the soliton crystal and the separated solitons, turned out to be most suitable for the generation of OFC for the purpose of calibration of astronomical spectrographs.Optical frequency combs constitute a discrete optical spectrum with lines that are equidistantly positioned. Frequency combs generated in modelocked lasers have been proposed and already successfully tested as calibration sources for high-resolution astronomical spectrographs. However, there is a variety of novel astronomical instruments that operate in the low-and medium resolution range. They also would profit from the deployment of frequency combs as calibration marks. We propose a fibre-based approach for optical frequency comb generation that is specifically suitable for spectrographs with low and medium resolution. This approach consists of two fibres fed with two continuouswave lasers. To be able to generate broadband, stable, and low-noise frequency combs, we need to understand the optical pulse formation in different fibre stages. In this paper, we focus our attention on the pulse build-up in the first fibre stage of the proposed approach and study it numerically by means of the Soliton Radiation Beat Analysis.

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Section: Mathematical Modelmentioning

confidence: 99%

Soliton radiation beat analysis of optical pulses generated from two continuous-wave lasers

Zajnulina

Böhm

Blow

et al. 2015

Chaos: An Interdisciplinary Journal of Nonlinear Science

View full text Add to dashboard Cite

show abstract

“…We define the optimum length L opt of a fibre as the propagation distance between the beginning of the fibre and the first pulse intensity maximum. At the same time, the optimum length denotes the propagation distance point of the maximum optical-pulse compression and, thus, of the broadest possible spectrum [36].…”

Section: Optimum Lengths Of Fibres a And Bmentioning

confidence: 99%

“…for fibre B [36], where γ A denotes the nonlinear parameter of fibre A, T is constant as a function of P 0 . In this region, P 0 is not sufficient to induce the nonlinearity that can effectively compress the initial sine wave into a train of solitons.…”

Section: Optimum Lengths Of Fibre a And B Depending On The Initial Lamentioning

confidence: 99%

“…However, the compression of pico-second pulses suffers from the loss of the pulse energy into an undesired broad pedestal containing up to 70% of the total pulse energy [34,36]. This has a reduction of the pulse peak power as a result leading to the degradation of the peak-power dependent FWM process.…”

Section: Figure Of Merit and Pedestal Contentmentioning

confidence: 99%

“…-How the pedestal content depends on the the initial LF S and β A 2 ? We define the pedestal content as a relative difference between the total energy of one single pulse and the energy of an approximating sech-profile with the same peak power and the FWHM as the pulse [34,36]:…”

Section: Figure Of Merit and Pedestal Contentmentioning

confidence: 99%

See 2 more Smart Citations

Generation of optical frequency combs via four-wave mixing processes for low- and medium-resolution astronomy

et al. 2015

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We investigate the generation of optical frequency combs through a cascade of four-wave mixing processes in nonlinear fibres with optimised parameters. The initial optical field consists of two continuous-wave lasers with frequency separation larger than 40 GHz (312.7 pm at 1531 nm). It propagates through three nonlinear fibres. The first fibre serves to pulse shape the initial sinusoidal-square pulse, while a strong pulse compression down to sub-100 fs takes place in the second fibre which is an amplifying erbium-doped fibre. The last stage is a low-dispersion highly nonlinear fibre where the frequency comb bandwidth is increased and the line intensity is equalised. We model this system using the generalised nonlinear Schrödinger equation and investigate it in terms of fibre lengths, fibre dispersion, laser frequency separation and input powers with the aim to minimise the frequency comb noise. With the support of the numerical results, a frequency comb is experimentally generated, first in the near infra-red and then it is frequency-doubled into the visible spectral range. Using a MUSE-type spectrograph, we evaluate the comb performance for astronomical wavelength calibration in terms of equidistancy of the comb lines and their stability.

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Generation of Few-Cycle Laser Pulses Using A Photonic Quasi-crystal Fiber

Gandhi

Melwin

Babu

et al. 2017

Springer Proceedings in Physics

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We explore the optical properties of a proposed solid-core photonic quasi-crystal fiber (SC-PQF) of 10-fold for the wavelengths from 300 to 1100 nm. The proposed SC-PQF exhibits a admissible low dispersion of -8.6481 ps 2 /km, a third order dispersion of 0.00415 ps 3 /km and a large nonlinearity of 1684 W -1 km -1 at 450 nm, which turn out to be the desired optical properties for generating the few-cycle laser pulses. By exploiting these optical properties, we numerically demonstrate the generation of fewcycle laser pulses at 450 nm wavelength by means of higher-order soliton effect compression. KEY WORDSFew-cycle pulse, photonic quasi-crystal fiber, Dispersion, Nonlinearity.

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Cascaded higher-order soliton for non-adiabatic pulse compression

Cited by 50 publications

References 32 publications

Soliton radiation beat analysis of optical pulses generated from two continuous-wave lasers

Soliton radiation beat analysis of optical pulses generated from two continuous-wave lasers

Generation of optical frequency combs via four-wave mixing processes for low- and medium-resolution astronomy

Generation of Few-Cycle Laser Pulses Using A Photonic Quasi-crystal Fiber

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