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

Time-domain frequency-selective optical memories.

THOMAS W. MOSSBERG

Published Jan 1, 1989• 0 citations
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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
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.
We propose and demonstrate a novel type of frequency-selective optical memory that writes and reads the data in both the time domain and the frequency domain. Temporal 16-bit data were stored by accumulated-photon-echo bit-by-bit storage at 103 frequency addresses within the inhomogeneous line of the (7)F(0)-(5)D(0) transition of Eu(3+):Y(2)SiO(5), which yields a total memory capacity of 1.6 kbits in a single spot of 240-microm diameter. The keys to the success of this experiment are this material's long dephasing time and lack of spectral diffusion.