Coherent optical OFDM systems based on the fractional Fourier transform

Author

Cincotti, Gabriella

Author_Institution

Dept. of Appl. Electron., Univ. Roma Tre, Rome, Italy

fYear

2012

fDate

2-5 July 2012

Firstpage

1

Lastpage

4

Abstract

An innovative Orthogonal Frequency Division Multiplexing (OFDM) scheme based on orthogonal chirped subcarriers is proposed. We show that the fractional Fourier transform (FrFT) of the input signal can be electronically implemented with a complexity equivalent to the conventional fast Fourier transform (FFT); on the other hand, the planar device that implements the FrFT in the optical domain is similar to the passive arrayed waveguide grating (AWG) device that performs the FFT. We analyze the spectral efficiency, the peak-to-average power ratio (PAPR) and the frequency offset sensitivity of a FrFT-based optical OFDM system, and make an accurate comparison with the standard FFT-based implementation.

Keywords

OFDM modulation; arrayed waveguide gratings; fast Fourier transforms; optical fibre networks; optical modulation; FFT; FrFT; coherent optical OFDM systems; fast Fourier transform; fractional Fourier transform; frequency offset sensitivity; optical domain; orthogonal chirped subcarriers; orthogonal frequency division multiplexing scheme; passive AWG device; passive arrayed waveguide grating device; peak-to-average power ratio; planar device; spectral efficiency; Arrayed waveguide gratings; Chirp; Fourier transforms; Integrated optics; Optical fibers; Peak to average power ratio; Fourier transform; OFDM; chirp signals; dispersion compensation; fractional Fourier transform; multicarrier modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Transparent Optical Networks (ICTON), 2012 14th International Conference on

Conference_Location

Coventry

ISSN

2161-2056

Print_ISBN

978-1-4673-2228-7

Electronic_ISBN

2161-2056

Type

conf

DOI

10.1109/ICTON.2012.6253832

Filename

6253832