Experimental Assessment of 10 Gbit/s SSB OFDM IM-DD Systems Performance Employing Raised-Cosine Based Symbol Precoding

• Published in: Journal of lightwave technology Vol. 32; no. 8; pp. 1631 - 1638
• Main Authors: Cruz, Pedro E. D., Alves, Tiago M. F., Cartaxo, Adolfo V. T.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 15.04.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplitude modulation; Applied sciences; Bandwidth; Circuit properties; Coding, codes; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Information, signal and communications theory; Integrated optics. Optical fibers and wave guides; Multiplexing; Optical and optoelectronic circuits; Optical attenuators; Optical receivers; Optical transmitters; Orthogonal frequency division multiplexing (OFDM); Peak to average power ratio; peak-to-average power ratio (PAPR); Signal and communications theory; single-sideband (SSB); symbol precoding; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; Integrated optics; Single mode fiber; Bit error rate; Optical modulator; Non linear optics; Peak to average power ratio; Orthogonal frequency division multiplexing (OFDM); symbol precoding; Direct detection; Coding; single-sideband (SSB); Orthogonal frequency division multiplexing; Pretreatment; peak-to-average power ratio (PAPR); Non linear effect; Intensity modulation; Single sideband; Optical fiber; High rate transmission
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2014.2309494

The performance improvement of 10 Gbit/s single-sideband orthogonal frequency division multiplexing intensity-modulated direct-detection systems achieved by reducing the signal peak-to-average power ratio (PAPR) with a symbol precoding technique based on the raised-cosine pulse, without and with bandwidth expansion, is evaluated experimentally. The impact of pre-emphasis (PE), necessary to mitigate the setup frequency limitations, on the PAPR reduction achieved by symbol precoding is investigated. At the input of the optical modulator, PAPR reductions of ~ 3 dB with PE and without PE are achieved using the precoding technique without band excess; with precoding with band excess of 25%, PAPR reductions of ~ 4 dB with PE and 4.5 dB without PE are obtained. Due to precoding, a bit error ratio (BER) improvement of almost two orders of magnitude is shown along 150 km standard single mode fiber transmission, for BERs around 10 -4 . In addition, it is also shown that precoding enables similar BER improvement with 75 km fiber propagation when nonlinear fiber effects are moderate.