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Binary optical true-time delay based on the white cell: design and demonstration

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4 Author(s)
Anderson, B.L. ; ElectroSci. Lab., Ohio State Univ., Columbus, OH, USA ; Rabb, D.J. ; Warnky, C.M. ; Abou-Galala, F.

An optical true-time delay device that uses a binary counting system in a modified White cell is demonstrated. The switching engine uses four spherical mirrors and a three-state digital micromirror array. The delay part, as designed, provides 6 bits of delay ranging from 78 ps to 5 ns, using a combination of dielectric blocks for short delays and lens trains for longer ones. Long lens trains are folded for compactness. The authors describe the design and demonstrate two of the 6 bits of delays experimentally. Delays were accurate to within the measurement resolution of 1.25 ps. The insertion loss varied from 3.1-5.2 dB, depending on delay. It was found that the micromirrors do not contribute significantly to the loss.

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Lightwave Technology, Journal of  (Volume:24 ,  Issue: 4 )