We present theoretical and experimental results for the expected impact on high-throughput optical communication
systems of pulse broadening effects from scattered light propagating through water-based clouds. Existing analytical
models are compared with experimental results. A preferred Monte Carlo model is developed and validated from field
measurements of off-axis scattering through clouds, using a low-power continuous wave laser source at 1550 nm
wavelength. This model is used in the time domain to examine the effects of pulse broadening for Gigabit and higher
systems with practical apertures and fields of view. Results indicate that, for most current scenarios, pulse stretching
may not cause significant inter-symbol interference.
We report a new familiy of polarimetric imaging cameras based on tunable liquid crystal components. Our camera designs use a dual frequency liquid crystal tunable filter that rotates the polarization of incoming light, in front of a single linear polarizer. The unique features of this approach include fast switching speed, high transmission throughput, no mechanical moving parts, broad bandwidth, high contrast ratio, wide viewing angle, and compact/monolithic architecture. This paper discusses these tunable liquid crystal polarimetric imaging camera architectures (time division, amplitude division), the benefits of our design, the analysis of laboratory and field data, and the applicability of polarization signatures in imaging.