## Abstract

We propose a new way to structure the digital signal processing for *reduced guard-interval* (RGI) OFDM optical receivers. The idea is to digitally parallelize the processing over multiple parallel virtual sub-channels, occupying disjoint spectral sub-bands. This concept is well known in the optical or analog sub-carrier domains, but it turns out that it can also be performed* efficiently in the digital domain.* Here we apply critically sampled uniform analysis and synthesis DFT filter bank signal processing techniques in order to realize a novel hardware efficient variant of RGI OFDM, referred to as *Multi-Sub-Band OFDM* (MSB-OFDM), reducing by 10% receiver computational complexity, relative to a single-polarization version of the CD pre-equalizer. In addition to being more computationally efficient than a conventional RGI OFDM system, the signal flow architecture of our scheme is amenable to being more readily realized over multiple FPGAs, for experimental demonstrations or flexible prototyping.

© 2011 OSA

Full Article | PDF Article**Related Articles**

Yannis Benlachtar, Philip M. Watts, Rachid Bouziane, Peter Milder, Deepak Rangaraj, Anthony Cartolano, Robert Koutsoyannis, James C. Hoe, Markus Püschel, Madeleine Glick, and Robert I. Killey

Opt. Express **17**(20) 17658-17668 (2009)

Mohammad E. Mousa-Pasandi, Qunbi Zhuge, Xian Xu, Mohamed M. Osman, Mathieu Chagnon, and David V. Plant

Opt. Express **20**(15) 17017-17028 (2012)

R.P. Giddings, E. Hugues-Salas, and J.M. Tang

Opt. Express **20**(18) 20666-20679 (2012)