Crossed Bragg cell implementation of an interferometric spectrum analyzer

Jerry B. Wood

doi:10.1117/12.21272

1 September 1990 Crossed Bragg cell implementation of an interferometric spectrum analyzer

Jerry B. Wood

Proceedings Volume 1296, Advances in Optical Information Processing IV; (1990) https://doi.org/10.1117/12.21272
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

Acousto-optic interferometric spectrum analyzers are important for signal detection and signal processing applications due to their dynamic range and their coherent detection capabilities. The inability to fabricate a photodetector which matches the available dynamic range of the optical subassembly often limits the performance of an interferometric spectrum analyzer. The photodetector fabrication can be simplified by designing the interferometric spectrum analyzer in a way that a common IF is present at each pixel location. The conventional approach to generating a constant IF in an interferometric spectrum analyzer is to mix the incoming signal with a reference signal on the photodetector element. When this technique is used to produce the IF, an interferometric spectrum analyzer contains spurious signals in its output with no input signal as a result of the overlap of the reference signals on the photodetectors. An alternate approach to producing the constant IF desired for the photodetectors is discussed in this paper. The described approach does not generate spurious signals when no input signal is present.

Citation Download Citation

Jerry B. Wood "Crossed Bragg cell implementation of an interferometric spectrum analyzer", Proc. SPIE 1296, Advances in Optical Information Processing IV, (1 September 1990); https://doi.org/10.1117/12.21272

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