Abstract
Pulse shaping gives communications engineers another degree of freedom in designing a link. It holds promise to allow extending transmission reach, achieve optical multiplexing at highest spectral efficiency or to limit nonlinear distortions. A variety of pulse shapes—rectangular, sinc, raised cosine to cite just a few—have been investigated but the important question is how optical transmitters can generate such pulses at the necessary speed. Should the transmitter be realized in the digital domain, the all-optical domain or can it be implemented as a hybrid? In this chapter, the fundamentals for pulse shaping in transmitters and receivers are reviewed. A particular emphasis is on orthogonal frequency division multiplexing (OFDM) where the system’s data are encoded onto subcarriers with a rectangularly shaped impulse response, and Nyquist pulse shaping where the symbols are carried by Nyquist pulses. Electronic, digital and optical processors are described and recent experimental demonstrations are reported.
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Acknowledgments
Juerg Leuthold acknowledges contributions from the EU-Project FOX-C and support by ETH Zurich, Switzerland. Juerg Leuthold is also very much indebted to Wolfgang Freude from Karlsruhe Institute of Technology (KIT) with whom he collaborated in the past and who contributed a lot to the OFDM section in this chapter. Camille Brès acknowledges support by the EPFL Lausanne, Switzerland.
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Leuthold, J., Brès, CS. (2015). All-Optical Pulse Shaping for Highest Spectral Efficiency. In: Wabnitz, S., Eggleton, B. (eds) All-Optical Signal Processing. Springer Series in Optical Sciences, vol 194. Springer, Cham. https://doi.org/10.1007/978-3-319-14992-9_8
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