Open AccessTheoretical and experimental evaluation of clipping and quantization noise for optical OFDM
Author(s) -
Christian Berger,
Y. Benlachtar,
Robert I. Killey,
Peter Milder
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.017713
Subject(s) - orthogonal frequency division multiplexing , clipping (morphology) , quantization (signal processing) , electronic engineering , computer science , converters , bit error rate , optical power , nonlinear distortion , distortion (music) , optics , telecommunications , power (physics) , amplifier , physics , bandwidth (computing) , algorithm , engineering , channel (broadcasting) , laser , linguistics , philosophy , quantum mechanics
Orthogonal frequency division multiplexing (OFDM) has recently gained substantial interest in high capacity optical fiber communications. Unlike wireless systems, optical OFDM systems are constrained by the limited resolution of the ultra high-speed digital-to-analog converters (DAC) and analog-to-digital converters (ADC). Additionally, the situation is exacerbated by the large peak-to-average power ratio (PAPR) inherent in OFDM signals. In this paper, we study the effects of clipping and quantization noise on the system performance. We analytically quantify the introduced distortion as a function of bit resolution and clipping ratio, both at the DAC and ADC. With this we provide a back-to-back signal-to-noise ratio analysis to predict the bit error rate of the system, assuming a fixed received optical power and ideal electrical-optical-electrical conversion. Simulation and experimental results are used to confirm the validity of the expressions.