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We study the channel equalizer (CE) based on independent component analysis (ICA) for optical orthogonal-frequency-division-multiplexing (OFDM) systems without using training symbols (TSs). We begin by studying mathematical ICA models of optical OFDM systems and considering both the direct-detection optical OFDM (DDO-OFDM) and polarization division multiplexing coherent-detection optical OFDM (PDM-CO-OFDM)...
We propose a QR decomposition based channel equalizer in DDO DFT-S OFDM. A higher tolerance to CD and PMD induced power fading than conventional equalizer is achieved through an iterative sequence detection of OFDM symbols.
We demonstrate, for the first time, an injection-locked Fabry Perot laser operating at 20-Gb/s. This laser can be deployed in wavelength-division-multiplexing OFDM-PONs. Intensity modulation and direct detection are used and 0.5-dB SNR penalty is observed after 52-km fiber.
Compared with backup sharing in WDM networks, it is more complex and challenging to share backup resources in OFDM-based optical networks with elastic bandwidth allocation. We propose and evaluate conservative and agressive backup sharing policies.
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