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.
© 2006 IEEE
Betty Lise Anderson, David J. Rabb, Carolyn M. Warnky, and Feras Abou-Galala, "Binary Optical True-Time Delay Based on the White Cell: Design and Demonstration," J. Lightwave Technol. 24, 1886- (2006)