Switched grating devices for phased-array applications

Thomas W. Stone; Michelle S. Malcuit; Jeffrey A. Kleinfeld

doi:10.1117/12.259003

22 November 1996 Switched grating devices for phased-array applications

Thomas W. Stone, Michelle S. Malcuit, Jeffrey A. Kleinfeld

Proceedings Volume 2844, Photonics and Radio Frequency; (1996) https://doi.org/10.1117/12.259003
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Free space optical systems are described that use switchable grating technology and nonlinear materials to form digital time shifters. A cascade of n independently controlled gratings provides 2ⁿ evenly spaced time delay paths. Featured characteristics including potential for excellent switch isolation, spurious beam and crosstalk suppression, reduction in complexity, and low insertion loss are discussed in the context of phased array applications. Varied configurations are discussed including hybrid free- space/guided wave configurations for long time delays; transmission and double-pass digital optical time shifters; and entire array drivers that replace many single-channel time shifters with a single configuration. Using free space micro-optics, many independent time shifter configurations can be compactly stacked. A novel noise suppression device is discussed that enhances the channel isolation and signal purity of the systems.

Citation Download Citation

Thomas W. Stone, Michelle S. Malcuit, and Jeffrey A. Kleinfeld "Switched grating devices for phased-array applications", Proc. SPIE 2844, Photonics and Radio Frequency, (22 November 1996); https://doi.org/10.1117/12.259003

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