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Error performance of a coherent free space optical system with K-distributed turbulence is studied. A closed-form expression of the moment generating function for K-distributed turbulence is derived, and the moment generating function is used to obtain the exact error rates for binary phase shift keying (BPSK), BPSK with spatial diversity, as well as differential phase-shift keying. Based on our analytical...
Transmission characteristics of free-space optical (FSO) data transmission systems are characterized. Issues of optical directionality, being related to the optical modulation depth, are investigated for a variety of retroreflecting structures. A composite solid retroreflector is introduced as a novel element for such optical wireless systems, and it is shown that this device has an omni-directional...
A multichannel spatial encoding and extraction technique is demonstrated for laser-based experimental applications. The technique makes use of a multichannel beam chopper to encode spatial information onto the transverse profile of a laser beam. Lock-in detection is subsequently employed in a parallel processing algorithm to extract the encoded experimental spatial information. The technique is demonstrated...
A technique for encoding modulation frequencies onto beam profiles is demonstrated. The experimental design employs phase-sensitive lock-in detection in a parallel format to encode and extract spatial and spectral information. This encoding technique is introduced by way of a Multichannel Optical Chopper, whose operation is demonstrated for a variety of spatial optical contrast masks and a spectral...
Free-carrier generation and recombination dynamics are studied in InP photonic crystals using an ultrafast time-resolved reflectivity setup. It is found that the free-carrier lifetime depends strongly on the overall structure of the photonic crystal lattice
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