Highly Sensitive Optical Multilevel Transmission of Arbitrary Quadrature-Amplitude Modulation (QAM) Signals With Direct Detection

A proposal for the realization of highly sensitive optical direct-detection (incoherent) multilevel transmission with arbitrary signal constellation without optical chromatic dispersion (CD) compensation is reviewed in this paper. We introduce transmitter-side signal processing, ¿CD pre-equalization...

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Veröffentlicht in:	Journal of lightwave technology 2010-01, Vol.28 (1), p.123-130
Hauptverfasser:	Kikuchi, N., Sasaki, S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Adaptive equalizers amplitude shift keying Applied sciences Detection, estimation, filtering, equalization, prediction differential phase-shift keying Exact sciences and technology Information, signal and communications theory Modulation, demodulation multilevel systems optical fiber communication Optical fiber communications Optical modulation Optical noise Optical receivers Optical sensors Optical signal processing Optical telecommunications Optical transmitters Proposals Quadrature amplitude modulation quadrature-amplitude modulation (QAM) Signal and communications theory Signal detection Signal to noise ratio Signal, noise Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments)
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Zusammenfassung:	A proposal for the realization of highly sensitive optical direct-detection (incoherent) multilevel transmission with arbitrary signal constellation without optical chromatic dispersion (CD) compensation is reviewed in this paper. We introduce transmitter-side signal processing, ¿CD pre-equalization,¿ and ¿phase preintegration¿ techniques to realize direct-detection CD-compensation free transmission of arbitrary optical quadrature-amplitude modulation (QAM) signals. We also adopt receiver-side signal processing, ¿multi-symbol phase estimation (MSPE),¿ and ¿non-Euclidean metric-based symbol detection¿ to improve the optical SNR (OSNR) sensitivity. We have performed up to 160-km standard single-mode fiber transmission of a 40-Gbit/s 16QAM signal and achieved the OSNR sensitivities only 0.5-2.4 dB away from those of coherent detection.
ISSN:	0733-8724 1558-2213
DOI:	10.1109/JLT.2009.2035827