Abstract
We propose a four-dimensional (4D) coded multiband-OFDM scheme suitable for beyond 1.4 Tb/s serial optical transport. The proposed scheme organizes the N-dimensional (ND) signal constellation points in the form of signal matrix; employs 2D-inverse FFT and 2D-FFT to perform modulation and demodulation, respectively; and exploits both orthogonal polarizations. This scheme can fully exploit advantages of OFDM to deal with chromatic dispersion, PMD and PDL effects; and multidimensional signal constellations to improve OSNR sensitivity of conventional optical OFDM. The improvement of 4D-OFDM over corresponding polarization-multiplexed QAM (with the same number of constellation points) ranges from 1.79 dB for 16 signal constellation point-four-dimensional-OFDM (16-4D-OFDM) up to 4.53 dB for 128-4D-OFDM.
Highlights
The optical communication systems have been evolving rapidly in recent years in order to adapt to the continuously increasing demand on transmission capacity, coming mainly from#137646 - $15.00 USD Received 3 Nov 2010; revised Dec 2010; accepted Dec 2010; published 6 Jan 2011(C) 2011 OSA the growing popularity of the Internet and multimedia in everyday life
In this paper, which can be considered as generalization of [4], we describe how to map multidimensional signal constellation points in coherent optical orthogonal frequency division multiplexing (OFDM) systems
As response to continuously increasing demands on transmission capacity, we proposed the 4D Low-density parity-check; (LDPC)-coded multiband-OFDM scheme suitable for beyond 1 Tb/s serial optical transport
Summary
The optical communication systems have been evolving rapidly in recent years in order to adapt to the continuously increasing demand on transmission capacity, coming mainly from. In order to keep the system complexity reasonably low, the new optical communications solutions have to offer affordable upgrades of currently available optical communication systems operating at lower speeds to satisfy the required higher speeds [1] One such approach was based on multidimensional coded modulation [2,3,4]. In this paper, which can be considered as generalization of [4], we describe how to map multidimensional signal constellation points in coherent optical orthogonal frequency division multiplexing (OFDM) systems. Because in optical channel we have four bases functions (in-phase, quadrature, xpolarization and y-polarization) available, the full advantage of this scheme can be obtained by employing the 4D signal constellations.
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