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Optical Communication Technology

The latest research of slow light using stimulated brillouin scattering

Shichen Li

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

Slow light could be used in data synchronization, optical buffer and signal processing. The latest methods and experimental results of slow light are reviewed with Emphasis on the principle to generate slow light via stimulated Brillouin scattering,and the method to increase the slow light bandwidth with a spectrally broadened pump laser is introduced. The significance and future of slow light are prospected.

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Slow light could be used in data synchronization, optical buffer and signal processing. The latest methods and experimental results of slow light are reviewed with Emphasis on the principle to generate slow light via stimulated Brillouin scattering,and the method to increase the slow light bandwidth with a spectrally broadened pump laser is introduced. The significance and future of slow light are prospected.
Slow- and Fast-Light has been investigated during the last years as a powerful tool to reduce and increase the group velocity of light pulses by light. It has enjoyed much recent interest because of the practical applications for telecommunication and information systems. Among these are optical signal processing, radio frequency-photonics, nonlinear optics and time domain spectroscopy. Furthermore, it can be seen as a key technology for optical delay lines, buffers, equalizers and synchronizers in packet switched networks. For a realization, there are different methods and material systems possible. Among them the nonlinear effect of stimulated Brillouin scattering (SBS) is of special interest. This article gives an overview about the fundamentals and some experimental results of the Slow- and Fast-Light effect based on the SBS in optical fibers.
Slow light is generated via the gain mechanisms of nonlinear optical phenomena-- stimulated stimulated Brillouin scattering in optical fiber. Slow light is characterized in terms of Brillouin threshold, gain spectrum, Brillouin frequency shift by using optical heterodyne detection. According to the measured Brillouin frequency shift, we set our signal frequency in the gain region by manual matching method to get the maximum gain, and the gain bandwidth is broadened to 450MHz using a phrase-modulated pump. A delay of 32ns is achieved for the 500ns input signal when the gain is 15dB.
Slow light is generated via the gain mechanisms of nonlinear optical phenomena-- stimulated stimulated Brillouin scattering in optical fiber. Slow light is characterized in terms of Brillouin threshold, gain spectrum, Brillouin frequency shift by using optical heterodyne detection. According to the measured Brillouin frequency shift, we set our signal frequency in the gain region by manual matching method to get the maximum gain, and the gain bandwidth is broadened to 450MHz using a phrase-modulated pump. A delay of 32ns is achieved for the 500ns input signal when the gain is 15dB.