We describe a innovative OFDM scheme based on orthogonal chirped subcarriers, that corresponds to the fractional Fourier transform (FrFT) of the input signal. The FrFT 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.

Date Published: 24 January 2012
PDF: 5 pages
Proc. SPIE 8284, Next-Generation Optical Communication: Components, Sub-Systems, and Systems, 828409 (24 January 2012); doi: 10.1117/12.910417

Published in SPIE Proceedings Vol. 8284:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems
Guifang Li; Dieter Stefan Jäger, Editor(s)