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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

All-optical dynamic memory for fiber communications

Xiao A. Shen, Ravinder Kachru

Published Oct 7, 1998• 3 citations
Publisher

Abstract

We report on the development of a compact and fully optical fiber coupled memory unit based on time-domain holography in Er3+:Y2SiO3 for the storage of large bandwidth, bit-serial optical data at 1.536 and 1.538 micrometers . Using this demonstration unit, we have successfully stored 1020 bits of data in a 40-MHz wide spectral channel at a single spatial location in the sample. The raw bit error rate of the unit was measured to be approximately 10-7 with the use of a simple peak detection scheme. We further show that the power of the retrieved data can be restored completely to the level of input data by a single erbium-doped fiber amplifier. Implications of the results for an all-optical dynamic optical memory are discussed.

DOI
10.1117/12.327057

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We report on the development of a compact and fully optical fiber coupled memory unit based on time-domain holography in Er3+:Y2SiO3 for the storage of large bandwidth, bit-serial optical data at 1.536 and 1.538 micrometers . Using this demonstration unit, we have successfully stored 1020 bits of data in a 40-MHz wide spectral channel at a single spatial location in the sample. The raw bit error rate of the unit was measured to be approximately 10-7 with the use of a simple peak detection scheme. We further show that the power of the retrieved data can be restored completely to the level of input data by a single erbium-doped fiber amplifier. Implications of the results for an all-optical dynamic optical memory are discussed.
An optical storage technique based on time-domain holography for the rapid recording and readout of page-formatted digital data is demonstrated. Storage of 356 kilobits of data was achieved at a single spatial location in a rare-earth–doped crystal. The digital data were recorded and accurately retrieved at a peak rate of 300 megabits per second without the use of error-correcting codes. The system's raw bit error rate is about 10 − 7 . This low bit error rate was achieved by a detection scheme for extraction of binary data. These results have implications for dynamic optical memory.
Summary form only given. One of the unique and perhaps the most attractive features of an optical memory is its ability to store and retrieve information in a bit-parallel format. Recently, we have proposed a new scheme for parallel data storage in TDOM. This scheme was proven to be practical and can be implemented with existing technologies. In a proof-of-principle experiment, four wavelength-multiplexed single-page volume spectral holograms, generated with black-and-white transparencies, were successfully stored in a single spatial location at a speed of approximately 23 /spl mu/s/frame. The experimental results project system's input/output bandwidth to exceed 40 Gbps, two orders of magnitude faster than a semiconductor cache memory. Here, we report on the use of the proposed scheme to demonstrate the storage of a large number of spectral holograms in a Eu/sup 3+/-doped Y/sub 2/SiO/sub 5/ crystal.
One of the unique and perhaps the most attractive features of an optical memory is its ability to store and retrieve information in a bit-parallel format.1-3 Recently, we have proposed a new scheme for parallel data storage in TDOM.4,5 This scheme was proven to be practical and can be implemented with existing technologies. In a proof-of-principle experiment, four wavelength-multiplexed single-page volume spectral holograms, generated with black-and-white transparencies, were successfully stored in a single spatial location at a speed of approximately 23 μs/frame. The experimental results project system's input/output bandwidth to exceed 40 Gbps, two orders of magnitude faster than a semiconductor cache memory.
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. In a proof-of-concept experiment, we have successfully stored a 42-microsecond long stream containing 420 bits of data in a 40-MHz spectral channel in a Eu3+:Y2SiO5 crystal. The stored data was repeatedly recalled for up to eight times with high signal fidelity, showing no measurable sidelobe-induced noise.
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Swept-carrier time-domain optical memory [Opt. Lett. 17, 535 (1992)] has been proposed as a means of storing optical data streams in inhomogeneously broadened spectral recording materials. The process provides for full utilization of the material storage bandwidth regardless of the data rate and permits storage of data sequences with durations exceeding the material dephasing time. We report what we believe is the first experimental demonstration of this storage process. Our experiments, implemented with frequency-swept diode lasers and Tm(3+):YAG storage material, demonstrate single-event storage of 98-bit data streams whose duration is an order of magnitude longer than the material dephasing time.