NDLI: Fundamental Limits of Electronic Signal Processing in Direct-Detection Optical Communications

Content Provider	IEEE Xplore Digital Library
Author	Franceschini, M. Bongiorni, G. Ferrari, G. Raheli, R. Meli, F. Castoldi, A.
Copyright Year	1983
Abstract	Electronic signal processing is becoming very attractive to overcome various impairments that affect optical communications, and electronic dispersion compensation (EDC) represents a typical application in the currently designed systems. However, the inherent limits in performance achievable by electronically processing the signal at the output of a nonlinear photodetector have not received the attention they deserve. In this paper, we investigate the information-theoretic limits of electronic signal processing in transmission systems employing direct photodetection and two possible modulation formats: 1 on-off keying (OOK) with nonreturn-to-zero pulses; and 2 optical duobinary modulation (ODBM). The analysis is based on the computation of the information rate, i.e., the maximum achievable data transfer rate, and accounts for the modulation format as well as relevant parameters of the transmission scheme. In particular, we investigate the impact of sampling rate, uncompensated chromatic dispersion (CD), and quantization resolution of the electrical signal at the output of a direct photodetector. For OOK systems, the obtained results show that the optical signal-to-noise ratio penalty entailed by EDC can be limited to about 2 dB at most values of CD of interest in current applications. Moreover, ODBM systems at high values of CD can almost perform as OOK systems at zero CD. For all the considered modulation formats, the obtained results show that the received electrical signal can be sampled at a rate of two samples per bit interval and quantized with a precision of 3 bits per sample to practically achieve the ultimate performance limits.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	1742
Ending Page	1753
Page Count	12
File Size	439203
File Format	PDF
ISSN	07338724
Volume Number	25
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical signal processing Optical fiber communication Optical modulation Photodetectors Pulse modulation Nonlinear optics Optical design Signal design Signal processing Optical pulses quantization Direct photodetection electronic dispersion compensation (EDC) information rate maximum-likelihood sequence detection (MLSD) on–off keying (OOK) optical duobinary modulation (ODBM)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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State-Complexity Reduction in MLSD Receivers for Optical Communications With Direct Photodetection

Fundamental limits of electronic signal processing in direct-detection optical communications.

State-complexity reduction in mlsd receivers for optical communications with direct photodetection.

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Chromatic dispersion compensation effectiveness of an MLSE-EDC receiver for three variants of duobinary

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Chromatic Dispersion Compensation Using Full-Field Maximum-Likelihood Sequence Estimation

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Fundamental Limits of Electronic Signal Processing in Direct-Detection Optical Communications

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