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Optics Communications

Storage threshold and amplitude restoration in an all-optical regenerative memory

Alistair J. Poustie, Keith J. Blow, Robert J. Manning

Published Jan 1, 1998• 23 citations
Publisher
DOI
10.1016/s0030-4018(97)00577-4

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In this paper, we experimentally measure the temporal evolution of amplitude restoration and thresholding in an all-optical regenerative memory. The memory architecture comprises two coupled all-optical switching gates and different wavelength optical pulses are used for clock and data sources. The all-optical gates are nonlinear interferometers incorporating semiconductor optical amplifiers as the nonlinear optical material. The concatenated response of these nonlinear interferometers provides the required square top transmission function that allows the stored optical pulses to be equalized in amplitude. The edge of the transmission function forms the threshold for pulse storage in the memory. We input a variable amplitude data packet into the memory and record the temporal evolution of the pulses with a fast real-time digitizing oscilloscope. Complete amplitude restoration of the pulses occurs after ∼5 circulations of the optical fibre memory loop. This measurement is in good agreement with the theoretical prediction and indicates that the square top transmission response could also be achieved for data ‚on the fly‘ with a linear concatenation of only a few all-optical switching gates.

Journal of Modern Optics•Jul 1, 1999•5 citations
We demonstrate an all-optical memory which can discriminate between input data pulses of differing amplitude. Only optical pulses with amplitudes above a predetermined threshold are stored and their amplitudes are equalised. We have demonstrated an all-optical regenerative memory with variable storage threshold and amplitude restoration. This functionality should be scaleable to high data rates approaching 100 Gbits and to low latency memory stores using integrated TOAD/SLALOM nonlinear optical switching devices.
In this paper, we experimentally measure the temporal evolution of amplitude restoration and thresholding in an all-optical regenerative memory. The memory architecture comprises two coupled all-optical switching gates and different wavelength optical pulses are used for clock and data sources. The all-optical gates are nonlinear interferometers incorporating semiconductor optical amplifiers as the nonlinear optical material. The concatenated response of these nonlinear interferometers provides the required square top transmission function that allows the stored optical pulses to be equalized in amplitude. The edge of the transmission function forms the threshold for pulse storage in the memory. We input a variable amplitude data packet into the memory and record the temporal evolution of the pulses with a fast real-time digitizing oscilloscope. Complete amplitude restoration of the pulses occurs after ∼5 circulations of the optical fibre memory loop. This measurement is in good agreement with the theoretical prediction and indicates that the square top transmission response could also be achieved for data ‚on the fly‘ with a linear concatenation of only a few all-optical switching gates.