中国科学通报：英文版

Large delay tunable slow-light based on high-gain stirnulated-Brillouin-scattering amplification in optical fibers

Xing Xing, Liang Liang, Zhan Zhan, Li, Xia, Yu-xing

Published Jan 1, 2009• 0 citations

Abstract

基于的悦耳的 stimulated-Brillouin-scattering (SBS ) 在光纤维慢光在未来在光缓冲有潜在的应用程序所有光的路由器交换系统。由于低 SBS 阀值和相对高的现实主义的信号力量，然而，在平常的 SBS 系统的获得在 ∼30 dB 被限制。这篇论文论述一个高获得的 SBS 计划认识到大延期慢光，它得益于作为 SBS 媒介在短纤维避免泵力量的弄空。实验表明那，直到 50 dB 非浸透的获得被观察了在单个阶段 591.8 m 纤维 SBS 扩大。慢光的延期能被获得 52 ns，和部分延期能超过 1。

Related papers

Large delay tunable slow-light based on high-gain stimulated-Brillouin-scattering amplification in optical fibers

Liang Xing, Li Zhan, Yuxing Xia

Chinese Science BulletinAug 17, 20092 citations

Slow-Light Using Stimulated Brillouin Scattering in Highly Nonlinear Optical Fibers

Kazi S. Abedin

Slow light generation through stimulated Brillouin scattering (SBS) in highly nonlinear glass fibers are

The Review of Laser EngineeringJan 1, 20090 citations

Nearly transparent SBS slow light in an optical fiber

Zhaoming Zhu, Daniel J. Gauthier

Slow-light delay via stimulated Brillouin scattering (SBS) in optical fibers is usually achieved with delay-dependent amplification that degrades system performance. To address this problem, we propose a SBS slow-light method that makes use of two widely separated anti-Stokes absorption resonances, and achieve nearly transparent slow light in an optical fiber. We demonstrate the method in a highly nonlinear optical fiber, and achieve a slow-light bandwidth of approximately 150 MHz and a relative of delay of approximately 0.3 for approximately 9-ns pulses with a signal attenuation of approximately 4.8 dB.

arXiv:physics/0607169Optics ExpressJan 1, 200640 citations

Flexible Slow and Fast Light Using Tailored Brillouin Spectra in Optical Fibers

Luc Thévenaz A, Sanghoon Chin, Kwang Yong Song +1 more

Stimulated Brillouin scattering makes possible the generation of synthesized gain spectra, so that innovative slow light schemes can be realized, ranging from broadband tunable delays to a zero-gain situation identical to an ideal electromagnetically-induced transparency.

Slow and Fast Light (SL)Jan 1, 20060 citations

Broadening-free stimulated Brillouin scattering-based slow and fast light in optical fibers

Thomas Schneider, Andrzej Wiatrek

The manipulation of the group velocity of optical signals (slow and fast light) has many possible applications in telecommunications, sensing, nonlinear optics, and so on. The exploitation of the effect of stimulated Brillouin scattering (SBS) is of special interest for the alteration of the group velocity in optical fibers, since it just requires standard telecom equipment and low-to-moderate optical power. However, each delay in one single, low-gain SBS-based slow-light system is accompanied by a pulse broadening. This is a result of the inherent Kramers–Kronig relations among the gain, the phase change, and the accompanied group velocity. For an ideal flat gain, the phase change is nonideal, and for an ideal phase change the gain curve leads to a broadening. Furthermore, if the gain bandwidth is adapted to the signal by broadening, the delay will be reduced. Thus the signal broadening can be reduced by several methods for one single low-gain slow-light system, but it cannot be zero. Here, we will show how a zero-broadening SBS-based slow light can be achieved with several methods. The basic idea is a reshaping of the original pulse in a second stage by saturation of the SBS system, or by the superposition of two gains. As will be shown, all of these systems show an almost ideal overall gain and phase function over the bandwidth of the pulses. Thus, SBS-based slow light with a delay bandwidth product of 1 bit and zero distortion is possible.

Optical EngineeringAug 25, 20140 citations

Physical Nature of “Slow Light” in Stimulated Brillouin Scattering

I. Valeri, Gregory Robert, E. Nadezhda

Frontiers in Guided Wave Optics and Optoelectronics 84 absorption is much too high to render the group effect useful.An exciting breakthrough happened in the early nineties when it was shown that group velocities of few tens of meters per second were possible with nonlinear resonance interactions (Hau et al., 1999).Two important features of nonlinear resonances make this possible: substantially reduced absorption, or even amplification, of radiation at a resonance, and sharpness of such resonances; the sharper a resonance, the higher dn/dω and so the stronger the enhancement of group index, and hence the greater the pulse is delayed.Widely ranging applications for slow light have been proposed, of which those for telecommunication systems and devices (optical delay lines, optical buffers, optical equalizers and signal processors) are currently of most interest (Gauthier, 2005).The essential demand of such devices is compatibility with existing telecommunication systems, that is they must be of wide enough bandwidth (≥10 GHz) and able to be integrated seamlessly into such systems.Of the various nonlinear resonance mechanisms and media, which allow sufficiently long induced delays, stimulated Brillouin and Raman scattering (SBS and SRS) in optical fiber are deemed to be among the best candidates.Currently SBS is the most actively investigated and many experimental and theoretical papers on pulse delaying via SBS in optical fiber have been published in the last few years, see the review paper (Thevenaz, 2008) and references therein.In this process the pulse to be delayed is a frequency down-shifted (Stokes) pulse.This is transmitted through an optical fiber through which continuous wave (CW) pump radiation is sent in the opposite direction to prime the delay process.It is supposed that the Stokes pulse is amplified by parametric coupling with the pump wave and a material (acoustic) wave in the medium (Kroll, 1965), and the amplification is characterised by a resonant-type gain profile.The dispersion of refractive index associated with this profile (which is similar to that in Fig. 1) can then be used to increase the group index for optical pulses at the Stokes frequency (Zeldovich, 1972).Along with obvious device compatibility, there are several other advantages of the SL via SBS approach for optical communications systems: slow-light resonance can be created at any wavelength by changing the pump wavelength; use of optical fibre allows for long interaction lengths and thus low powers for the pump radiation, the process runs at room temperature, it uses off the shelf telecom equipment, and SBS works in the entire transparency range of fibers and in all types of fiber.Currently a main obstacle to applications of this approach is the narrow SBS gain spectral bandwidth, (Thevenaz, 2008), which is typically ≈ 120-200 MHz in silica fiber in the spectral range of telecom optical radiation (~1.3-1.6 μm) (Agrawal, 2006).This chapter reviews our ongoing work on the physical mechanisms that give rise to pulse delay in SBS.In section 2 the theoretical background of the SBS phenomenon is given and the main working equations describing this nonlinear interaction are presented.In section 3 ways by which the SBS spectral bandwidth may be increased are addressed.Waveguide induced spectral broadening of SBS in optical fibre is considered as a means of increasing the bandwidth to the multi-GHz range.An alternative way widely discussed in the literature, (Thevenaz, 2008), is based on spectral broadening of the pump radiation.However it is shown through analytic analysis of the SBS equations converted to the frequency domain that pump radiation broadening by any reasonable amount has only a negligible effect on increasing the SBS bandwidth.Importantly in this section we show that, irrespective of the nature of the broadening considered, the SBS gain bandwidth remains www.intechopen.

InTech eBooksFeb 1, 20100 citations