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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 31, Iss. 15 — Aug. 1, 2013
  • pp: 2570–2577

Pulse-Shaping With Digital, Electrical, and Optical Filters—A Comparison

Rene Schmogrow, Shalva Ben-Ezra, Philipp C. Schindler, Bernd Nebendahl, Christian Koos, Wolfgang Freude, and Juerg Leuthold

Journal of Lightwave Technology, Vol. 31, Issue 15, pp. 2570-2577 (2013)


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Abstract

We investigate the performance of sinc-shaped QPSK signal pulses generated in the digital, electrical, and optical domains. To this end an advanced transmitter with a digital pulse-shaper is compared to analog transmitters relying on pulse-shaping with electrical and optical filters, respectively. The signal quality is assessed within a single carrier setup as well as within an ultra-densely spaced WDM arrangement comprising three channels. An advanced receiver providing additional digital filtering with an adaptive equalization algorithm to approximate an ideal brick-wall Nyquist filter has been used for all schemes. It is found that at lower symbol rates, where digital processing is still feasible, digital filters with a large number of filter coefficients provide the best performance. However, transmitters equipped with only electrical or optical pulse-shapers already outperform transmitters sending plain unshaped NRZ signals, so that for higher symbol rates analog electrical and optical techniques not only save costs, but are the only adequate solution.

© 2013 IEEE

Citation
Rene Schmogrow, Shalva Ben-Ezra, Philipp C. Schindler, Bernd Nebendahl, Christian Koos, Wolfgang Freude, and Juerg Leuthold, "Pulse-Shaping With Digital, Electrical, and Optical Filters—A Comparison," J. Lightwave Technol. 31, 2570-2577 (2013)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-31-15-2570

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