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IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)

Optical storage ring using novel rational-harmonic phase modulation

Chongjin Xie, Peida Ye

Published Nov 27, 2002• 0 citations
Publisher

Abstract

We propose a novel soliton storage ring scheme using rational-harmonic phase modulation. Unlike conventional soliton storage buffers, which require the modulation frequency equal to the stored data rate, in this scheme, we set the modulation signal repetition rate, and the modulation pulse width equal to the stored data period.
DOI
10.1109/leos.1998.737788

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We propose what is to our knowledge a novel storage ring that uses rational-harmonic phase modulation whereby the width of the modulation pulse is approximately equal to the data period and the ratio of the modulation frequency to the ring fundamental frequency is a noninteger. The stored data rate is then the lowest multiple of the modulation frequency and the fundamental frequency of the ring. Numerical simulation shows that the data rate of greater than the 40th harmonic of the modulation frequency can be stored stably in the ring, which means that ultrahigh-speed data pulses can be stored stably in the ring with a much lower modulation frequency.
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We propose a novel approach to time-domain storage of serial optical data. In this approach, two identical impulse-equivalent sequences are used as write and read pulses to store and later retrieve optical information. These pulse sequences are both amplitude and phase modulated in such a way that their autocorrelations resemble, as closely as theoretically possible, the autocorrelation of a single large brief pulse to ensure faithful data retrieval. Such impulse-equivalent sequences are known to exist for all lengths, permitting the storage of large-bandwidth data. The advantages of this approach include modest laser power requirement, high signal fidelity, and encrypted recording.
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