Abstract
We theoretically and experimentally evaluate a beat interference cancellation receiver (BICR) for direct detection optical orthogonal frequency-division multiplexing (DD-OFDM) systems that improves the spectral efficiency (SE) by reducing the guard band between the optical carrier and the optical OFDM signal while mitigating the impact of signal-signal mixing interference (SSMI). Experimental results show that the bit-error-rate (BER) is improved by about three orders of magnitude compared to the conventional receiver after 320 km single-mode fiber (SMF) transmission for 10 Gb/s data with a 4-QAM modulation using reduced guard band single-sideband OFDM (RSSB-OFDM) signal with 1.67 bits/s/Hz SE.
Highlights
The fast growth of Internet applications such as voice, video, and gaming has lead to a huge demand on the bandwidth of optical networks
It has been shown that chromatic dispersion (CD) and polarization mode dispersion (PMD) in single-mode fiber (SMF) systems could be compensated electrically using digital signal processor (DSP) at the receiver [4, 5]
We evaluated the beat interference cancellation receiver (BICR) which improves the spectral efficiency (SE) in Direct Detection OFDM (DD-OFDM) systems
Summary
The fast growth of Internet applications such as voice, video, and gaming has lead to a huge demand on the bandwidth of optical networks. CO-OFDM requires high complexity in the transceiver design and because of the sensitivity of OFDM to frequency offset and phase noise [9], lasers with very narrow linewidth are required at the transmitter and receiver sides [10]. To solve these complexities, DD-OFDM systems have been proposed for low cost systems. The channel estimation and CD compensation can be done at the receiver side without any link information
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