Abstract
We experimentally investigate the performance of a low-complexity non-iterative phase noise induced inter-carrier interference (ICI) compensation algorithm in reduced-guard-interval dual-polarization coherent-optical orthogonal-frequency-division-multiplexing (RGI-DP-CO-OFDM) transport systems. This interpolation-based ICI compensator estimates the time-domain phase noise samples by a linear interpolation between the CPE estimates of the consecutive OFDM symbols. We experimentally study the performance of this scheme for a 28 Gbaud QPSK RGI-DP-CO-OFDM employing a low cost distributed feedback (DFB) laser. Experimental results using a DFB laser with the linewidth of 2.6 MHz demonstrate 24% and 13% improvement in transmission reach with respect to the conventional equalizer (CE) in presence of weak and strong dispersion-enhanced-phase-noise (DEPN), respectively. A brief analysis of the computational complexity of this scheme in terms of the number of required complex multiplications is provided. This practical approach does not suffer from error propagation while enjoying low computational complexity.
Highlights
Coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission systems have been intensively investigated as a promising candidate for Ethernet transport at 100 Gb/s and beyond [1,2,3]
We experimentally investigate the performance of the interpolationbased inter-carrier interference (ICI) compensator in a 112 Gb/s reduced-guard-interval dual-polarization coherentoptical orthogonal-frequency-division-multiplexing (RGI-DP-CO-OFDM) transmission systems, employing a low-cost distributed feedback (DFB) laser
We investigated the performance of a non-iterative phase noise induced ICI compensator based on linear interpolation for OFDM transport systems
Summary
Coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission systems have been intensively investigated as a promising candidate for Ethernet transport at 100 Gb/s and beyond [1,2,3]. The performance of coherent transmission systems are known to suffer from laser phase noise and in the case of CO-OFDM systems, the degradation is more pronounced considering the relatively longer symbol duration with respect to single carrier (SC) schemes. This would limit the transmission reach and make the use of low linewidth laser sources inevitable. In [12,13], we numerically investigated the feasibility of a partial ICI compensation scheme based on a linear interpolation between the CPE estimates of consecutive OFDM symbols for CO-OFDM transport systems It is shown in [14] that this approach can minimize the mean square error (MSE) of the estimated interpolation of the time-domain phase noise samples.
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