Ms. Carrie Sjaarda Cornish Profile

Carrie Sjaarda Cornish

at TeraBeam Corp

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Publications (4)

Proceedings Article | 6 December 2002 Paper

Comparison between experimental and theoretical probability of fade for free-space optical communications

Ammar Al-habash, Kenneth Fischer, Carrie Cornish, Kenneth Desmet, Janae Nash

Proceedings Volume 4873, (2002) https://doi.org/10.1117/12.455514

KEYWORDS: Scintillation, Free space optics, Data modeling, Receivers, Avalanche photodetectors, Atmospheric scintillation, Sensors, Free space optical communications, Atmospheric optics, Data acquisition

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Proceedings Article | 6 December 2002 Paper

Background light environment for free-space optical terrestrial communications links

David Rollins, Jeff Baars, David Bajorins, Carrie Cornish, Kenneth Fischer, Thomas Wiltsey

Proceedings Volume 4873, (2002) https://doi.org/10.1117/12.455520

KEYWORDS: Sun, Receivers, Free space optics, Transceivers, Sensors, Solar processes, Coronagraphy, Avalanche photodetectors, Buildings, Diffraction

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Proceedings Article | 27 November 2001 Paper

Measurement by reflection analysis of optical attenuation through windows

Eric Eisenberg, Jeff Adams, Carrie Cornish

Proceedings Volume 4530, (2001) https://doi.org/10.1117/12.449809

KEYWORDS: Reflectivity, Interfaces, Signal attenuation, Glasses, Reflection, Free space optics, Buildings, Absorption, Dielectrics, Photodetectors

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Free space optical communication systems deployed in office buildings are subject to transmission loss through windows. Window attenuation varies between 0.4 and more than 15 dB. Window attenuation values are required to calculate communications link power budget and availability. But direct measurement of window attenuation in high-rise buildings is difficult since it requires access to both sides of the window. In this paper, we present a method of measuring optical attenuation from the interior side of a window. This method is based on measuring back reflections of a laser beam propagating through a semi-transparent dielectric medium, thus eliminating the need for access to the exterior of a building. In this system, a laser beam is launched at 45 degree(s) to normal incidence in order for the user to discriminate between the various reflections from the dielectric interfaces within the medium. A photodetector is then moved through the plane of incidence and the intensities of reflections from interfaces within the medium are measured. A simple formula is used to calculate total transmission of the optical system based on the relative intensities of the incident light beam and all resulting reflections. In this approach, it is assumed that the reflectivities of the first and final interfaces are identical. The index of refraction for glass from one commercial fabricator varies little; hence the reflectivity of uncoated air-glass interfaces in a particular window is the same. The intensity of the reflection from the final interface is attenuated by the entire medium twice. By comparison of the incident, first, and final reflected intensity a transmitted intensity can be determined. The same equation is used for a medium with any number of dielectric interfaces. A measurement of optical loss through a window without access to both sides of the medium is now possible. This method has been demonstrated to be accurate (+/- 1dB) through various windows with optical losses of up to 12dB.

Proceedings Article | 5 November 1998 Paper

Efficient waveform recall in absorbing media

Carrie Cornish, Mohammad Azadeh, W. Randall Babbitt, Leung Tsang

Proceedings Volume 3468, (1998) https://doi.org/10.1117/12.330416

KEYWORDS: Absorption, Barium, Chemical species, Numerical simulations, Bragg cells, Transient nonlinear optics, Distortion, Magnetism, Data storage, Avalanche photodetectors

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