25 GHz bandwidth Brillouin slow light in optical fibers

Song, Kwang Yong; Hotate, Kazuo

doi:10.1364/ol.32.000217

Cited by 126 publications

(72 citation statements)

References 8 publications

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“…The main restriction of this scheme is the loss of versatility, as prior knowledge of the signal characteristics must be known and the delay line is designed for a very specific type of signal. This feature was exploited to further extend the bandwidth of an SBS delay line over the 12-GHz limit provided by a single pump laser 43 . Two pumps were exactly separated by twice the Brillouin frequency shift ν B and identically broadened, so that the loss spectrum of Pump 1 is perfectly cancelled by the gain spectrum of Pump 2 at any frequency.…”

Section: Review Article | Focusmentioning

confidence: 99%

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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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Section: Review Article | Focusmentioning

confidence: 99%

“…4d, and the effective gain spectral distribution was measured to be approximately Gaussian with an estimated linewidth of 27 GHz (ref. 43).…”

Section: Review Article | Focusmentioning

confidence: 99%

Slow and fast light in optical fibres

2008

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“…This configuration was also successfully experimentally tested and demonstrated [16]. The smart combination of gain and loss spectra using a multiple pump scheme was also used to extend the bandwidth well beyond 10 GHz that was temporarily considered like the ultimate limit [17]. A 25 GHz bandwidth was experimentally demonstrated that can be potentially extended well beyond using additional pumps.…”

Section: Advanced Schemes Using Sbs Spectral Shapingmentioning

confidence: 99%

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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“…There have been a variety of approaches to realize optical delay modules [4][5][6][7][8][9][10][11][12][13][14][15][16]. A CROW (Coupled resonator optical waveguide) [5][6][7][8] has drawn interest for all-optical packet communication or optical signal processing modules because it can reduce the propagation speed variably.…”

Section: Introductionmentioning

confidence: 99%