Title

Nonlinearity mitigation for high-speed optical OFDM transmitters using digital pre-distortion

Authors

Authors

Y. Bao; Z. H. Li; J. P. Li; X. H. Feng; B. O. Guan;G. F. Li

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

OVER-FIBER SYSTEMS; PREDISTORTION; MODULATOR; RADIO; Optics

Abstract

Optical orthogonal frequency-division multiplexing (OOFDM) signal is sensitive to nonlinear distortions induced by optical modulators. We propose and experimentally demonstrate a digital pre-distortion (DPD) algorithm to linearize the optical modulators including electro-absorption modulated lasers (EML) and Mach-Zehnder modulators (MZM) used in high-speed OOFDM transmitters. By using an adaptive DPD algorithm with a learning structure, the inverse transfer function of a modulator, which is based on a polynomial model, has been obtained. In the experiment, the performance improvements with and without considering the memory effects of the DPD model are illustrated. The two typical kinds of high-speed OOFDM signals with a bit rate up to 30-Gb/s have been implemented experimentally. The results show that the nonlinear distortion induced by optical modulators can be compensated by using the DPD algorithm to substantially improve the optical modulation index. (c) 2013 Optical Society of America

Journal Title

Optics Express

Volume

21

Issue/Number

6

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

7354

Last Page

7361

WOS Identifier

WOS:000316796000074

ISSN

1094-4087

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