6 February 2004 A novel system for the imaging of optical multipaths
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The use of diffuse and line of sight optical radiation for wireless communications is an area of growing interest. In diffuse optical communications systems, light takes multiple paths from source to detector. Therefore knowledge of these multipaths is crucial to design of communications systems. In order to measure the characteristics of the optical channels a novel imaging system that records the frequency response of the indoor optical channel has been developed. The system uses a swept frequency laser source to illuminate the room and a large aperture telescope that concentrates incoming radiation onto a photomultiplier to receive it. Scanning of the receiver telescope yields data for all angles of arrival, allowing the angle-dependent frequency response to be obtained. Subsequent processing, using Fourier transform or superresolution techniques yields images of the arriving optical multipaths. In this paper the construction and characteristics of the imaging system are introduced. Frequency response measurements of a particular space, up to 750MHz, corresponding to approximately 1.5ns time resolution, are presented, together with images of light propagating within the coverage area.
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Dammika P Manage, Dammika P Manage, Grahame E Faulkner, Grahame E Faulkner, Dominic C O'Brien, Dominic C O'Brien, David J Edwards, David J Edwards, } "A novel system for the imaging of optical multipaths", Proc. SPIE 5210, Ultrahigh- and High-Speed Photography, Photonics, and Videography, (6 February 2004); doi: 10.1117/12.505251; https://doi.org/10.1117/12.505251

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