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Optics Letters

Swept-carrier time-domain optical memory

THOMAS W. MOSSBERG

Published Apr 1, 1992• 42 citations
Publisher

Abstract

A new time-domain approach to frequency-selective optical data storage is described. In this approach, a spatial storage cell is exposed to two cotemporal, spatially angled, frequency-chirped excitation fields whose duration can greatly exceed the homogeneous dephasing time of the storage material employed. The two beams have a fixed frequency offset, and one is temporally encoded with data. The new method averts several of the drawbacks of existing approaches to time- and frequency-domain optical memories.

DOI
10.1364/ol.17.000535

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Optics Letters•Apr 15, 1995•9 citations
A new time-domain approach to frequency-selective optical data storage is described. In this approach, a spatial storage cell is exposed to two cotemporal, spatially angled, frequency-chirped excitation fields whose duration can greatly exceed the homogeneous dephasing time of the storage material employed. The two beams have a fixed frequency offset, and one is temporally encoded with data. The new method averts several of the drawbacks of existing approaches to time- and frequency-domain optical memories.
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.
Summary form only given. The swept-carrier optical data storage technique provides high storage density together with high read-write speed. In this technique, data is temporally encoded on a frequency-swept optical data beam. This beam along with a cotemporal, frequency-swept, reference beam illuminate a storage material and act to record the temporal structure of the data beam. We point out here that by eliminating the frequency offset between swept-carrier data and reference beams, one records only a single sideband of the data beam and on reconstruction can generate a single-sideband signal beam containing essentially the same modulation information as the original dual-sideband data beam. This result may be useful in both memory storage applications where it may lead to higher spectral storage densities and in communications as a means of generating single-sideband optical beams, albeit with an intrinsic frequency chirp.
Frequency-selective optical data storage (FSDS) provides for the heavy multiplexing of data at single spatial storage locations. The time-domain approach to FSDS offers in addition the possibility of extremely high data input/output rates. Nevertheless, a variety of technical problems must be resolved before the widespread implementation of FSDS memories becomes feasible. In the case of time-domain FSDS, for example, one must detect signal beams despite the presence of relatively strong memory readout beams in close temporal and spatial proximity. We demonstrate that this difficulty can be turned into an advantage in the case of the newly introduced swept-carrier approach to FSDS.1
Time-and-space-domain holography [1,2] by stimulated photon echoes [3] provides a means of storing temporal and spatial properties of an ultrafast-varying light signal and recalling its authentic replica at any later moment. The possibility of recording complex time shapes of light pulses, which also means time-domain optical data storage, is based on the ability of frequency-selective absorbers to store with high accuracy the temporal Fourier components of the incident light [1-3]. The time-domain frequency-selective optical storage of binary or analog data is an alternative approach to the concept of frequency-selective high-density data storage that provides a parallel ultrafast data storage and processing in the frequency domain. The shortest detail of the signal to be stored is limited by the reverse inhomogeneous bandwidth of the storing media which reaches 10-100 fs for frequency-selective materials while the duration of the signal is limited by phase relaxation time T2 (usually 10−9-10−6s).