Evaluation of a potential Wave Division Multiplexer (WDM) for use in the IRSTD
Fernan, Paul Thomas
Cleary, David D.
Cooper, Alfred W.M.
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The design of a Wave Division Multiplexer (WDM) was evaluated. This design could be used in the AN/SAR-8 infrared search and target designation system currently being developed by the Navy. This design featured a spherical grating with a radius of curvature of 115 mm to test the capability of multiplexing 180 channels The grating was able to couple light from laser diodes at four different wave lengths (780.0nm, 789.0nm, 848.0nm, and 849.0nm). The most significant factor in coupling efficiency was astigmatism. This decreased the coupling efficiency by a factor of 500. The source linewidths were measured to assess the possibility of wavelength slicing. The capability to multiplex 180 channels is possible but cannot yet be achieved due to the lack of light sources that cover the wave length range required for a 180 channel system.
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