Long optically controlled delays in optical fibers

Song, Kwang Yong; Gonzalez-Herraez, Miguel; Thévenaz, Luc

doi:10.1364/ol.30.001782

Cited by 134 publications

(81 citation statements)

References 10 publications

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“…For instance, the predicted delay of 1 ns per dB gain was perfectly confirmed experimentally [6] and delays from -8 ns in fast-light regime up to 32 ns in slow-light regime could be realized in these early demonstrations [6]. Some months later, higher effective gains could be achieved by inserting spectrally neutral attenuators between fibre segments to prevent an excessive amplification of the signal while fully preserving the delaying effect [8]. As shown in Fig.…”

Section: Slow and Fast Light In Optical Fibres Using Stimulated Brilloumentioning

confidence: 54%

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Achievements in slow and fast light in optical fibres

Thévenaz

2008

2008 10th Anniversary International Conference on Transparent Optical Networks

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The ubiquitous role occupied by optical fibres in modern photonic systems has steadily stimulated research to realize slow and fast light devices directly in this close-to-perfect transmission line. This potentially offers the key advantage of a direct and flexible integration in most existing optical systems. The recent progress in the realization of optically-controlled delays in optical fibres, under normal environmental conditions and in the high-transparency spectral region, has paved the way towards real applications based on slow and fast light. This presentation shows the state-of-the-art research in this fascinating field and the possible outcomes in the near future.

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Section: Slow and Fast Light In Optical Fibres Using Stimulated Brilloumentioning

confidence: 54%

“…As shown in Fig. 1, delays could be extended up to 152 ns for a 40 ns input pulse, corresponding to a delay normalized to the pulse width of 3.6 [8]. Nevertheless, as theoretically predicted [7,9,10], the pulse experienced a very substantial broadening by a factor 2.4 for the maximal delay.…”

Section: Slow and Fast Light In Optical Fibres Using Stimulated Brilloumentioning

confidence: 62%

Achievements in slow and fast light in optical fibres

Thévenaz

2008

2008 10th Anniversary International Conference on Transparent Optical Networks

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“…For instance, a predicted delay of 1 ns per dB gain was perfectly confirmed experimentally 15 and changes in the propagation time of from -8 ns in the fast-light regime up to 32 ns in the slow-light regime could be realized in these early demonstrations 15 . Some months later, higher effective gains were achieved by inserting spectrally neutral attenuators between fibre segments to prevent an excessive amplification of the signal while fully preserving the delaying effect 16 . In this way, delays could be extended up to 152 ns for a 40-ns input pulse, corresponding to a delay normalized to the pulse width of 3.6 (ref.…”

Section: Review Article | Focusmentioning

confidence: 99%

“…In this way, delays could be extended up to 152 ns for a 40-ns input pulse, corresponding to a delay normalized to the pulse width of 3.6 (ref. 16). Nevertheless, as theoretically predicted 8,9,17 , the pulse experienced a very substantial broadening by a factor 2.4 for the maximum delay.…”

Section: Review Article | Focusmentioning

confidence: 99%

Slow and fast light in optical fibres

2008

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The ubiquitous role of optical fibres in modern photonic systems has stimulated research to realize slow and fast light devices directly in this close-to-perfect transmission line. Recent progress in developing optically controlled delays in optical fibres, operating under normal environmental conditions and at telecommunication wavelengths, has paved the way towards real applications for slow and fast light. This review presents the state-of-the-art research in this fascinating field and possible outcomes in the near future. The development of high-quality silica optical fibres with excellent transmission capabilities has directly contributed to the tremendous expansion of the global communication network. The success is due to their unrivalled low-loss performance (typically 50% of light is still present after a 15-km transmission distance), their wide bandwidth, which allows terabits per second of information to be transmitted over more than 1,000 km, and also their extremely low production cost. Realizing tunable delays for optical data signals directly in fibres, as well as integrating such devices into existing communication networks, is certainly a very attractive approach for optimizing the flow of data traffic in future networks. The approach may also enhance the capabilities of optical and microwave-on-optical-carrier signal processing. Given the limited possibilities for engineering the dispersion curve of standard single-mode fibres without creating complex photonic-crystal structures (see pages 448 and 465 of this issue 1,2 ), much research on fibre-based delays has been directed towards solutions based on spectral resonances to generate slow and fast light. The initial pioneering demonstrations of slow and fast light in various media all exploited narrow spectral resonances, typically created by electromagnetically induced transparency 3 or coherent population oscillation 4 . Narrow spectral resonances have a dramatic effect on optical propagation, as any sharp spectral change in the medium's transmission curve results in a steep quasi-linear variation of the effective refractive index with wavelength in the narrow spectral region near the resonance. This in turn results in a strong change in the group velocity at the exact centre of the resonance 5 . The velocity change is strongest for narrower spectral resonances (as explained in detail below) and for this reason, the early experiments were all carried out in special media, such as ultracold atomic gases or atomic transitions in a crystalline solid at a well-defined wavelength. Luc ThévenazWithin the resonance, the relationship between the change in the optical transmission and the delay can be determined as follows. The refractive-index change, Δn, as a function of the optical frequency, ν, is calculated using the Kramers-Kronig transformation, and the index change associated with the group velocity, Δn g , is then found using the relationship Δn g = Δn + ν(dΔn/dν) (ref. 5). Finally, the delay, ΔT, added to the normal transit time in the medium...

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“…We used this last, fairly simple expression to compare the most representative fibers considered so far: silica [25,26], high-nonlinearity bismuth fiber [27,28], As 2 Se 3 fiber [22], along with the results reported here. The comparison is provided in Table 3, with all the data reported for experiments without polarization control (k=0.5).…”

Section: Brillouin Scatteingmentioning

confidence: 99%

Nonlinear Properties of Chalcogenide Glass Fibers

Sanghera¹,

Aggarwal²,

Shaw³

et al. 2010

Frontiers in Guided Wave Optics and Optoelectronics

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Chalcogenide glasses have demonstrated high third-order Kerr (χ (3) ) nonlinearities up to 1000x higher than silica glass which make them attractive for applications such as nonlinear switching, optical regeneration, Raman amplification, parametric amplification, and supercontinuum generation. Poling of chalcogenide glasses to induce an effective second order (χ (2) ) nonlinearity has also been demonstrated and opens the possibility for the use of poled glass waveguides for applications such as frequency conversion or electro-optic modulation. Stimulated Brillouin scattering (SBS) has also been investigated in As 2 S 3 and As 2 Se 3 single-mode fibers. The threshold intensity for the stimulated Brillouin scattering process was measured and used to estimate the Brillouin gain coefficient. Preliminary results indicate record high values for the figure of merit and theoretical gain, compared to silica, which bodes well for slow-light based applications in chalcogenide fibers.

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Long optically controlled delays in optical fibers

Cited by 134 publications

References 10 publications

Achievements in slow and fast light in optical fibres

Achievements in slow and fast light in optical fibres

Slow and fast light in optical fibres

Nonlinear Properties of Chalcogenide Glass Fibers

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