SBS technology-based long-service-life broadband optimal pulse memory

Abstract

The invention discloses an SBS technology-based long-service-life broadband optical pulse memory, which belongs to the field of nonlinear optics. The memory utilizes three narrow-band continuous DFB lasers with approximately 1,550 nm output wavelengths to generate read pulses, write pulses and data pulses respectively, and takes sulfur compound glass optical fiber as a storage medium. The data pulses encounter the write pulses in the optical fiber, and the energy of the data pulses is substantially evacuated through a stimulated Brillouin scattering process and is stored in the optical fiber in a form of sound wave. After manual control for a certain time, a read pulse is input into the optical fiber from a direction the same as that of the write pulse, and restores the sound waves into the data pulses comprising information content after interaction with the sound waves. The read pulses and the write pulses are controlled by different lasers respectively and the lasers are modulated through a noise source, so that gains and absorption spectrums of the read and write pulses are controlled and pruned to fulfill the aims of long-service-life broadband optical storage and high reading efficiency.

Description

Technical field [0001] The invention relates to an optical storage system in a nonlinear optical medium, in particular to a long-life broadband optical pulse memory based on stimulated Brillouin scattering (stimulated Brillouin scattering) technology, belonging to the field of nonlinear optics. Background technique [0002] In the literature Zhaoming Zhu, Daniel J. Gauthier, Robert W. Boyd. Stored Light in an Optical Fiber via Stimulated Brillouin Scattering. Science. 2007, 318: 1748-1750, an optical storage system is introduced, which consists of two outputs A narrowband continuous DFB (Distributed feedback) laser with a wavelength of nearly 1550nm is used to generate read, write and data pulses respectively. The read and write pulses are generated by one DFB laser, and the data pulse is generated by another DFB (distributed feedback) laser. Linear single-mode fiber. The Brillouin frequency shift of read and write pulses and data pulses is 9.6 GHz. The read and write pulses an...

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Problems solved by technology

This does not take into account factors such as low readout efficiency, pulse distortion, unrecognizable and unapplicable

[0005] 2. The transfer rate of data pulses that can be stored in the memory is limited

In the above system, although the number of bytes stored can be increased by using methods such as ultra-short pulses, after all, in practical applications, the duration of the pulse is required and cannot be infinitely short, so the number of bytes that can be stored is proposed. restricted

In addition, in the stimulated Brillouin scattering process, the natural Brillouin gain linewidth is tens of MHz, so in the above storage scheme, such a narrow bandwidth optical memory will limit the data transmission rate to tens of Mb / s, which is far from the data transmission rate of tens of Gb / s in existing communication systems

[0006] 3. The readout efficiency is low, and the peak power of the required read and write pulses is too large

The data pulse is not completely stored and released, the main reason is that, on the one hand, it may be because the spectral width of the write pulse is not sufficiently larger than the result of the data pulse spectrum; on the other hand, the Brillouin gain coefficient of the optical fiber is too small

Also, for phonons, the optical fiber structure is not very reasonable, resulting in a large diffraction loss of the acoustic wave, so that the data pulse has high readout efficiency and high data fidelity requires high peak power, which is not conducive to practical application

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