Abstract
We propose a novel coherent optical orthogonal frequency-division
multiplexing (CO-OFDM) scheme with reduced guard interval (RGI) for
high-speed high-spectral-efficiency long-haul optical transmission. In this
scheme, fiber chromatic dispersion is compensated for within the receiver
rather than being accommodated by the guard interval (GI) as in conventional
CO-OFDM, thereby reducing the needed GI, especially when fiber dispersion is
large. We demonstrate the generation of a 448-Gb/s RGI-CO-OFDM signal with
16-QAM subcarrier modulation through orthogonal band multiplexing. This
signal occupies an optical bandwidth of 60 GHz, and is transmitted over 2000
km of ultra-large-area fiber (ULAF) with five passes through an 80-GHz-grid
wavelength-selective switch. Banded digital coherent detection with two
detection bands is used to receive this 448-Gb/s signal. Wavelength-division
multiplexed transmission of three 80-GHz spaced 448-Gb/s RGI-CO-OFDM
channels is also demonstrated, achieving a net system spectral efficiency of
5.2b/s/Hz and a transmission distance of 1600 km of
ULAF.
© 2010 IEEE
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