Compensation of LED Nonlinearities in a Gigabit Polymer Optical Fiber Transmission link using a Combined Decision Feedback and Volterra-Series Equalization with Spectrally Efficient Multilevel PAM and CAP

Conference: Photonische Netze - 16. ITG-Fachtagung
05/07/2015 - 05/08/2015 at Leipzig, Deutschland

Proceedings: ITG-Fb. 257: Photonische Netze

Pages: 6Language: englishTyp: PDF

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Authors:
Schueppert, Manuel; Bunge, Christian-Alexander (Hochschule für Telekommunikation Leipzig, Gustav-Freytag-Str. 43-45, 04277 Leipzig, Germany)
Kruglov, Roman (Polymer Optical Fiber Application Center (POF-AC), TH Nürnberg, Wassertorstr. 10, 90489 Nuremberg, Germany)

Abstract:
The application of different equalizer structures for LED-based short range Gigabit data transmission over polymer optical fiber is investigated. LEDs are highly attractive low-cost optical transmitters for various kinds of next-generation transmission systems. To achieve a Gigabit throughput using low-cost optical and electrical components, spectrally efficient modulation formats are usually required. High spectral efficiency allows to overcome the issue of the components’ bandwidth limitation and to operate at low sampling rates. However, an increase of spectral efficiency brings a higher sensitivity of the signal to nonlinear distortions. At the same time, depending on the operating conditions, LEDs may introduce nonlinear signal distortions which are not well understood yet. In this paper we present an investigation on the use of a Volterra-series-based extension of a decision-feedback equalizer (DFE) to compensate for both linear and nonlinear signal distortions when using multilevel pulse amplitude modulation (M-PAM), and multilevel carrierless amplitude and phase modulation (M 2-CAP).