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Optics Letters

Demonstration of optical coherent transient true-time delay at 4 Gbits/s

Ming Tian, Randy R. Reibel, William Randall Babbitt

Published Aug 1, 2001• 17 citations
Publisher

Abstract

Multigigabit-per-second true time delay (TTD) was experimentally demonstrated by use of optical coherent transient techniques in a Tm(3+):YAG crystal. A delay accuracy of 1 ps and a delay resolution of 7 ps (both measurement limited) were achieved. The retrieved data retained good fidelity.
DOI
10.1364/ol.26.001143

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Summary form only given. A practical device creating a variable RF true-time delay (TTD) for signals on an optical carrier would be useful in array antennas. An optical coherent transient (OCT)-TTD device could provide high-resolution delays (/spl sim/1 ps) over a wide range (/spl sim/1 /spl mu/s), for high bandwidth signals (/spl sim/10 GHz) with currently available materials. In previously demonstrated OCT-TTD devices, two optical pulses separated in time and space program a delay in an absorbing medium as a spatial-spectral grating on an inhomogeneously broadened transition (IBT). In the paper, we experimentally demonstrate widely tunable OCT-TTD of a continuous optical data stream without changing the timing between the programming pulses.
A technique is proposed and experimentally demonstrated that achieves simultaneous optical pattern waveform storage and programmable time delay for continuous real-time signal processing by use of optical coherent transient technology. We achieve variable-time-delay and broadband signal processing by frequency shifting of two chirped programming pulses, the chirp rate of one being twice that of the other, without using brief reference pulses and without changing the timing of the programming sequence. We demonstrate the technique experimentally in Tm(3+): YAG at 5 K for 40-MHz chirps by performing temporal signal convolution with true-time delays that vary over a 250-ns range.
Summary form only given. Accurate true-time delays are essential to correctly steer modern phased-array antennas. Optical coherent transient technology has the ability to store a variable true-time delay as a spatial-spectral holographic population grating in an inhomogeneously broadened absorber (IBA). Typically, two optical pulses program the delay. A third optical pulse or waveform applied to the IBA generates a delayed replica of itself. The delay is typically defined by /spl tau//sub 21/=t/sub 2/-t/sub 1/, the arrival time difference of the first two pulses. However, we find that this prediction for the delay of the emitted signal only holds for input optical pulse areas much less than pi. Experimental investigation and simulations were performed to observe the variation in arrival time of the output signal.
We experimentally demonstrate a novel, all-optical technique that spatially isolates two parts of a temporally encoded optical information stream from each other by means of spatial-spectral holographic technology. A brief reference pulse is applied to an inhomogeneously broadened absorber [Tm(3+):YAG (0.1 at. %) at ~4.4 K] in the direction opposite that of the information stream, overlapping it on a boundary between the two temporal parts to be isolated (i.e., the header and the data). Another brief reference pulse subsequently applied in the opposite (the same) direction as that of the information stream results in an emitted optical output that mimicks only the part of the information stream that follows (precedes) the first reference pulse in a timeforward (time-reversed) fashion, completely isolated from the other part.