Spectral Methods for High-Speed Optical Transmultiplexing and Coding
Final rept. 30 Sep 95-29 Nov 97
PURDUE RESEARCH FOUNDATION LAFAYETTE IN
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This program is demonstrated all-optical methods for generation, processing, and transmultiplexing data format conversion of ultrafast lightwave signals. This work is based on a generalized space-time processing concept, where ultrafast time-domain signals are converted into the spatial domain, where they can be processed using parallel optical and smart pixel optoelectronic techniques, and then subsequently reconverted back into the ultrafast time domain. The program investigated GaAsGaAlAs photorefractive quantum wells as a dynamic holographic medium for femtosecond pulse processing in spectral holography systems. Several optical error control code techniques and optical codes have been investigated over the last year, most based on optical spectral encoding technique spectal-null codes improved bandwidth utilization and drastically reduced dispersion sensitivity can be achieved by encoding individual bits shaped as specific orthogonal waveforms. The results from this work, show that particular orthogonally coded waveforms can indeed be multiplexed on top of each other both in time and frequency and still remain orthogonal at the receiver end. We also show that dispersion, linear and nonlinear chips do not affect the orthogonality properties of these waveforms.
- Fiber Optics and Integrated Optics
- Non-Radio Communications