Impact of beam weighting on dynamic range and resolution of optical spectrum analyzers

Duane Anthony Satorius; Timothy E. Dimmick

doi:10.1117/12.139932

24 August 1992 Impact of beam weighting on dynamic range and resolution of optical spectrum analyzers

Duane Anthony Satorius, Timothy E. Dimmick

Proceedings Volume 1704, Advances in Optical Information Processing V; (1992) https://doi.org/10.1117/12.139932
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

Acousto-optic spectrum analyzers have found wide application in signal processing as a result of their ability to provide wide bandwidth, rapid transforms with relative ease. In the past the dynamic range of acousto-optic spectrum analyzers has been limited to approximately 30 dB by the dynamic range of the CCD sensor array. Recently CCD sensors with non-linear response have been developed with dynamic range in excess of 60 dB. In order to fully utilize the dynamic range of these sensors, it is necessary to properly weight the beam profile illuminating the Bragg cell. We examine the effect of beam weighting on the resolution and dynamic range of optical spectrum analyzers. Because of its ease of implementation, particular attention is paid to the truncated Gaussian beam shape. The effects of acoustic attenuation in the Bragg cell and amplitude and phase variations on the beam profile are examined. We find that beam weightings which result in increased dynamic range do so at the expense of decreased frequency resolution.

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Duane Anthony Satorius and Timothy E. Dimmick "Impact of beam weighting on dynamic range and resolution of optical spectrum analyzers", Proc. SPIE 1704, Advances in Optical Information Processing V, (24 August 1992); https://doi.org/10.1117/12.139932

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