Three-dimensional optical time delay units for radar

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Three-dimensional optical time delay units for radar

Riza, Nabeel A.
Date: 1993-11-09
Copyright: © 1993 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Citation: Riza, N. A. (1993) 'Three-dimensional optical time delay units for radar', Proceedings of SPIE, 2026, Photonics for Processors, Neural Networks, and Memories; SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation San Diego, CA, USA, pp. 227-237. doi: 10.1117/12.163576
Published Version: 10.1117/12.163576

Abstract:

2D SLM based optical time delay units (OTDUs) are introduced for radar and wideband signal processing applications. In particular, the mature nematic liquid crystal (NLC) SLM technology is considered for the proposed architecture. A 1 X 2 optical switch is demonstrated using a parallel-rub birefringent-mode NLC cell, a bulk optics cube polarizing beamsplitter, and a sheet polarizer. Switch measurements taken at 633 nm show a > 3400 : 1 or > 35 dB output port optical isolation. The 1 X 2 NLC switch is used to build a 1-bit, 3.33 ns duration free-space OTDU using mirrors and total internal reflection corner prisms. The unit demonstrated a > 30 dB optical signal-to-noise ratio for both delay and no-delay positions.

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