Zero-broadening measurement in Brillouin based slow-light delays

Wiatrek, Andrzej; Henker, Ronny; Preußler, Stefan; Ammann, Max J.; Schwarzbacher, Andreas T.; Schneider, Thomas

doi:10.1364/oe.17.000797

Cited by 22 publications

(9 citation statements)

References 14 publications

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“…Since this distorted response is intimately related to the delaying process as described by the theory of linear systems, the need to introduce nonlinear elements is unavoidable to realize distortion-less signal delaying in slow light systems [51,63,76,77]. In an experiment reported by Wiatrek et al a distinct saturated Brillouin amplifier was used as a nonlinear system, which could mitigate the broadening effect [78] and result in signal delays up to 1 bit with a minor distortion. However, the time delay per unit gain is reduced by the saturated amplifier since the amplifier provides gain with no real delaying effect.…”

Section: Brillouin Slow Light With Pulse Broadening Compensationmentioning

confidence: 99%

Tunable photonic delay lines in optical fibers

Chin

Thévenaz

2012

Laser & Photonics Reviews

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A comprehensive overview is presented about optical fiber-based tunable photonic delay lines, which have been steadily developed over the last decade for the realization of all-optically controlled timing functions. The most widely used techniques, such as those based on slow & fast light and wavelength conversion associated to dispersion, are described and their physical limitations are discussed in terms of the maximal achievable delay, the associated signal distortion and signal bandwidth. Besides, an entirely different approach for all-optical signal delaying is introduced. This technique is based on movable grating reflectors dynamically generated in highly birefringent optical fibers. This type of delay line has experimentally demonstrated large tunable delaying with a moderate signal distortion for high capacity optical data streams and even for wideband analog signals.

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Section: Brillouin Slow Light With Pulse Broadening Compensationmentioning

confidence: 99%

Tunable photonic delay lines in optical fibers

Chin

Thévenaz

2012

Laser & Photonics Reviews

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“…Therefore, a general scheme to achieve slow light without distortion for any arbitrary fractional delay is still under investigation, but the results of these papers seem to indicate that nonlinear elements should be essential for this task. In [18], a possible solution to mitigate the broadening effect was put forward using a depleted (therefore nonlinear) Brillouin amplifier as slow light system. Even though the pulse broadening issue was improved, the broadening compensation was certainly not complete, and the saturation in the amplification had the unwanted outcome of reducing also the delaying effect.…”

Section: Introductionmentioning

confidence: 99%

Complete compensation of pulse broadening in an amplifier-based slow light system using a nonlinear regeneration element

Chin¹,

Gonzalez-Herraez²,

Thévenaz³

2009

Opt. Express

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We experimentally demonstrate complete compensation of pulse\ud broadening in an amplifier-based slow light system. The configuration of\ud the delay line basically consists of two stages: a conventional Brillouin slow\ud light system and a nonlinear regeneration element. Signal pulses\ud experienced both time delay and temporal broadening through the Brillouin\ud delay line and then the delayed pulses were delivered into a nonlinear\ud optical loop mirror. Due to the nonlinear response of the transmission of the\ud fiber loop, the inevitably broadened pulses were moderately compressed in\ud the output of the loop, without loss in the capacity to delay the pulses. The\ud overall result is that, for the maximum delay, the width of the pulse could be\ud kept below the input width while the time delays introduced by the slow\ud light element were preserved. Using this delay line, a signal pulse with\ud duration of 27 ns at full width at half maximum was delayed up to 1.3-bits\ud without suffering from signal distortion

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“…Drawbacks are the delay limiting factor of the saturation and pulse broadening effects due to spectral narrowing and the additional artificial group velocity dispersion in a SBS slow-light system. But recently, investigations were presented to deal with those disadvantages [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…While the first approach works in the saturated regime [9], the second emulates a saturated gain shape by using a double gain line system in the linear regime. By a cascading of the presented systems or in connection with other conventional slow-light systems, any demanded almost distortion-free pulse delay could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Comparative investigation of zero-broadening methods in Brillouin based slow-light systems

Wiatrek

Henker

Preußler

et al. 2009

IET Irish Signals and Systems Conference (ISSC 2009)

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The manipulation of the velocity of optical pulses in fibers by so-called slow-light systems seems to be very promising for future all-optical networks, but actual approaches suffer from an inevitable pulse broadening due to the delay process. In this article two different methods for the achievement of zero-broadening in Brillouin based slow-light systems are compared in theory and experiment. While one system works in the saturated regime of a Brillouin amplifier the other works in its linear regime. Both approaches fully avoid the system inherent broadening of conventional slow-light delays and can therefore extend such systems to increase their efficiency significantly.

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Zero-broadening measurement in Brillouin based slow-light delays

Cited by 22 publications

References 14 publications

Tunable photonic delay lines in optical fibers

Tunable photonic delay lines in optical fibers

Complete compensation of pulse broadening in an amplifier-based slow light system using a nonlinear regeneration element

Comparative investigation of zero-broadening methods in Brillouin based slow-light systems

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