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Journal of the Optical Society of America B

Optical storage ring with novel rational-harmonic phase modulation

Chongjin Xie, Peida Ye

Published Jan 1, 1999• 1 citation
Publisher

Abstract

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.

DOI
10.1364/josab.16.000128

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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.
The requirements for higher data rates in optical communication systems lead to the use of more efficient modulation formats. In the networks the all optical synchronization and storage of these signals is still a major challenge in order to enable higher transmittable data rates and reduce the energy consumption. In this contribution we show for the first time, to the best of our knowledge, the tunable storage of phase modulated optical data packets with up to 60 pulse widths. This opens the way to the optical storage of data packets modulated with highly efficient modulation formats.
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We demonstrate that temporally long laser pulses with appropriate phase modulation can replace either temporally brief or frequency-chirped pulses in a time-domain optical memory to store and retrieve information. A 1.65-µs-long write pulse was biphase modulated according to the 13-bit Barker code for storing multiple bits of optical data into a Pr(3+):YAlO(3) crystal, and the stored information was later recalled faithfully by using a read pulse that was identical to the write pulse. Our results further show that the stored data cannot be retrieved faithfully if mismatched write and read pulses are used. This finding opens up the possibility of designing encrypted optical memories for secure data storage.
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.