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Physics Procedia

Optimized shaping of stored data-pulse by stimulated Brillouin scattering in an optical fiber

Jiaojiao Li, Ding Yingchun

Published Jan 1, 2011• 0 citations
Publisher

Abstract

The effect of a proper shaping of the temporal envelope of stored data-pulse based on stimulated Brillouin scattering in As2Se3 optical fibers is studied. The stored data-pulse shape can be optimized to lead to a substantial enhancement of the readout efficiency and reduction of aberration of the data-pulse. The spectrum of the three different data-pulses is engineered so that the spectral width of the pulses is changed while preserve the pulse duration, making possible to match at best the control pulse spectrum. Gaussian shaped pulses show the optimized temporal profile gain the biggest readout efficiency and the smallest aberration when compared to exponential and rectangular pulses.

DOI
10.1016/j.phpro.2011.06.177

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The effect of a proper shaping of the temporal envelope of stored data-pulse based on stimulated Brillouin scattering in As2Se3 optical fibers is studied. The stored data-pulse shape can be optimized to lead to a substantial enhancement of the readout efficiency and reduction of aberration of the data-pulse. The spectrum of the three different data-pulses is engineered so that the spectral width of the pulses is changed while preserve the pulse duration, making possible to match at best the control pulse spectrum. Gaussian shaped pulses show the optimized temporal profile gain the biggest readout efficiency and the smallest aberration when compared to exponential and rectangular pulses.
The effect of a proper shaping of the temporal envelope of isolated pulses in slow-light systems based on stimulated Brillouin scattering in optical fibers is studied and experimentally demonstrated. The pulse shape can be optimized to lead to a substantial enhancement of the delaying effect. The spectrum of the optical pulses is engineered so that the spectral width of the pulse is minimized while preserving the pulse duration, making possible to match at best the Brillouin spectrum. Exponentially shaped pulses show the minimal FWHM spectral width and experience the largest time delay when compared to Gaussian or rectangular pulses.
The coupled wave equation in the optical fiber based on stimulated Brillouin scattering(SBS) is discretized,the light storage process via SBS is solved by MATLAB,and the effect of the tem poral line profile and spectral line profile of the control-light on the light storage is studied.The read pulse and write pulse play a different role in light storage,but the differences of these can not be found in the theory analysis.The calculations show that the differences of the temporal line profile of the con trol pulse do not obviously affect the stored results.The chirped Gaussian pulse and rectangular pulse can get the best storage because of their wide spectrum.
We describe a method for storing sequences of optical data pulses by converting them into long-lived acoustic excitations in an optical fiber through the process of stimulated Brillouin scattering. These stored pulses can be retrieved later, after a time interval limited by the lifetime of the acoustic excitation. In the experiment reported here, smooth 2-nanosecond-long pulses are stored for up to 12 nanoseconds with good readout efficiency: 29% at 4-nanosecond storage time and 2% at 12 nanoseconds. This method thus can potentially store data packets that are many bits long. It can be implemented at any wavelength where the fiber is transparent and can be incorporated into existing telecommunication networks because it operates using only commercially available components at room temperature.
Different Slow-light systems have been discussed and developed as a powerful tool to reduce the group velocity of optical signals during the last years. It has enjoyed much recent interest because of the potential system applications in optical telecommunication and information systems. Especially the nonlinear effect of stimulated Brillouin scattering (SBS) has become important for fiber based Slow-light systems. But, the SBS also has two challenges. First, the maximum time delay is limited due to the saturation of the Brillouin amplification process and second, the delay of the pulses is accompanied by pulse distortions (pulse shape broadening). For these aspects the shape of the Brillouin spectrum is of special interest. In this article a system is presented which allows the optimisation of the Brillouin spectrum. Simulations and first measurements show how the time delay can be enhanced with a simultaneous reduction of the pulse distortions.
When light is stored in an optical fiber via stimulated Brillouin scattering (SBS) process, data-pulse from the storage to the restoration through two processes relates to acoustic wave, so the effects of an acoustic wave diffraction have to be considered. We numerically solve SBS coupled wave equations containing acoustic diffraction and study the effects of acoustic wave diffraction on stored light when the radius of fiber as storage medium is different. The results of light storage are obtained in the two situations presence and absence of acoustic wave diffraction when the control-pulse and the data-pulse have different temporal distribution profile. The results show that the acoustic diffraction influence on the light storage is more and more small with the fiber radius increasing, and when the fiber radius is 6 micron, the effects is disappear. The results also show that acoustic diffraction effects are minimum when data-pulse and control-pulse are rectangular and Gaussian distribution profile respectively.
We analyse the stimulated Brillouin scattering （SBS） slow light using double broadband pumps in a single mode fiber. A new SBS gain spectrum tailoring method is proposed using two Gaussian-shaped broadband pumps with different powers and spectral widths, and the central frequency interval of them is carefully set at two Brillouin frequency shifts to make sure that the gain of one pump has the same center with the loss of the other. The top of the gain spectrum of the strong pump beam can be counteracted by the loss spectrum of the weak pump beam to construct a flat top gain spectrum. We give the optimized conditions of the laser powers and spectral widths between two broadband pumps to obtain a flat gain. Distortions of signal pulse under this flat top gain are studied and compared with that obtained using a single broadband pump. We find that the flat top gain profile can effectively reduce the pulse distortions.