Topic
Brillouin scattering
About: Brillouin scattering is a research topic. Over the lifetime, 11426 publications have been published within this topic receiving 178306 citations.
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TL;DR: In this paper, a non-local acousto-optic light scattering was used to produce non-reciprocal single-sideband modulation and mode conversion in an integrated silicon photonic platform.
Abstract: Non-reciprocal light propagation is essential to control optical crosstalk and back-scatter in photonic systems. However, realizing high-fidelity non-reciprocity in low-loss integrated photonic circuits remains challenging. Here, we experimentally demonstrate a form of non-local acousto-optic light scattering to produce non-reciprocal single-sideband modulation and mode conversion in an integrated silicon photonic platform. In this system, a travelling-wave acoustic phonon driven by optical forces in a silicon waveguide spatiotemporally modulates light in a separate waveguide through linear interband Brillouin scattering. This process extends narrowband optomechanics-based schemes for non-reciprocity to travelling-wave physics, enabling large operation bandwidths of more than 125 GHz and up to 38 dB of non-reciprocal contrast between forward- and backward-propagating optical waves. The modulator operation wavelength is tunable over a 35-nm range by varying the optical drive wavelength. Such travelling-wave acousto-optic interactions provide a promising path toward the realization of broadband, low-loss isolators and circulators within integrated photonics. Non-reciprocal single-sideband modulation and mode conversion are realized in a low-loss integrated silicon waveguide, enabling >125 GHz operation bandwidths and up to 38 dB of non-reciprocal contrast between forward- and backward-propagating waves.
153 citations
TL;DR: A novel distributed sensor that utilizes the temperature and strain dependence of the frequency at which the Brillouin loss is maximized in the interaction between a cw laser and a pulsed laser is presented.
Abstract: We present a novel distributed sensor that utilizes the temperature and strain dependence of the frequency at which the Brillouin loss is maximized in the interaction between a cw laser and a pulsed laser. With a 22-km sensing length, a strain resolution of 20 µ? and a temperature resolution of 2°C have been achieved with a spatial resolution of 5 m.
152 citations
TL;DR: In this article, the core radius is made non-uniform along its length to utilize the core-radius dependence of the longitudinal acoustic frequency, and the effective Brillouin gain of an SBS suppression fiber prepared by the VAD method was reduced by 3.5 dB compared with conventional fibres.
Abstract: Stimulated Brillouin scattering (SBS) in a fibre is suppressed by making the core radius nonuniform along its length to utilise the core-radius dependence of the longitudinal acoustic frequency. The effective Brillouin gain of an SBS suppression fibre prepared by the VAD method was reduced by 3.5 dB compared with conventional fibres.
152 citations
TL;DR: In this paper, the Brillouin threshold power of a perfluorinated graded-index polymer optical fiber (POF) with 120μm core diameter was investigated using a laser with an operating wavelength of 1.55μm.
Abstract: Brillouin scattering properties in a perfluorinated graded-index polymer optical fiber (POF) with 120 μm core diameter were experimentally investigated using a laser with an operating wavelength of 1.55 μm. The Brillouin frequency shift and the Brillouin bandwidth were 2.83 GHz and 105 MHz, respectively. The calculated Brillouin gain coefficient of 3.09×10−11 m/W was comparable to that of fused silica fibers. The Brillouin threshold power of the 100 m POF was estimated to be 24 W, which we believe can be reduced by employing POFs with smaller cores.
146 citations
TL;DR: In this article, the authors survey the developments in Brillouin scattering during the past fifteen years and describe classical effects, including stimulated and resonance effects, on the frequency interval of acoustic excitations in the hypersonic regime.
Abstract: Surveys the developments in Brillouin scattering during the past fifteen years. Mainly classical effects are described, therefore excluding stimulated and resonance Brillouin scattering. The study is limited so that the frequency interval of the acoustic excitations lies in the hypersonic regime.
145 citations