Comparison of delay enhancement mechanisms for SBS-based slow light systems

Schneider, Thomas; Henker, Ronny; Lauterbach, Kai-Uwe; Junker, Markus

doi:10.1364/oe.15.009606

Cited by 47 publications

(26 citation statements)

References 17 publications

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“…This behaviour indicates that the measurement is done in the saturation regime [14]. The achieved maximum fractional time delay of approximately 1.3 Bit is comparable to the measurement results for a single gain slow-light system in [5]. Figure 5(b) shows the FWHM ratio in relation to the pump power at different SBS gain bandwidths.…”

Section: Simulationsupporting

confidence: 74%

“…With all optical signal processing such as optical data synchronization and optical buffers it would be possible to overcome the speed limitations of todays networks. Therefore, over the last years many rigorous studies were performed on achieving an optically controlled tunable pulse delay at high delay times [1][2][3][4][5]. The nonlinear optical effect of stimulated Brillouin scattering (SBS) became important for fiber based slow-light systems, because of its apparent advantages; working in the whole transparency range of every fiber, high delay times at small pump powers and easy implementation in existing communication networks.…”

Section: Introductionmentioning

confidence: 99%

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Zero-broadening measurement in Brillouin based slow-light delays

Wiatrek¹,

Henker²,

Preußler³

et al. 2009

Opt. Express

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Abstract:A novel method for the achievement of zero-broadening in a SBS based slow-light system is discussed in theory and demonstrated experimentally. The system is realized just with a single broadened Brillouin gain. It is shown, that if the gain bandwidth is much broader than the initial pulse width, the output pulse width decreases with increasing pump power. A compression of approximately 90 % of the initial pulse width was achieved in simulation and experiment.

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Section: Simulationsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Zero-broadening measurement in Brillouin based slow-light delays

Wiatrek¹,

Henker²,

Preußler³

et al. 2009

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…Following the same approach, gain compensation by a superimposed broadband loss or by two narrowband losses placed on the wings of the gain spectral distribution, as shown in Fig. 4b, offers the possibility of enhancing the delaying capability by up to a factor of two when compared with a single-resonance scheme 45 .…”

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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“…5b, offers the possibility to enhance the delaying capability up to twice when compared to a single resonance scheme 26 . Recently, self-generated fast light, in total absence of any pump source, has been reported 27 .…”

Section: Advanced Delay Schemes Combining Sbs Gain and Lossmentioning

confidence: 99%

Potentialities of slow and fast light in optical fibers

2009

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The ubiquitous role of optical fibers 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 fibers, operating under normal environmental conditions and at telecommunications wavelengths, has paved the way towards real applications for slow and fast light. Advanced schemes can be realized thanks to the extremely flexible possibility to shape the gain spectrum to make it optimized for applications. Ultra wide bandwidth, delaying with flat amplitude response and lower distortion were successfully demonstrated this way.

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Comparison of delay enhancement mechanisms for SBS-based slow light systems

Cited by 47 publications

References 17 publications

Zero-broadening measurement in Brillouin based slow-light delays

Zero-broadening measurement in Brillouin based slow-light delays

Slow and fast light in optical fibres

Potentialities of slow and fast light in optical fibers

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