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Fast dispersion estimation in coherent optical 16QAM fast OFDM systems
1Photonic Systems Group, Tyndall National Institute and Department of Physics, University College Cork, Lee Maltings, Prospect Row, Cork, Ireland. jian.zhao@tyndall.ie
Abstract:
Fast channel estimation is crucial to increase the payload efficiency which is of particular importance for optical packet networks. In this paper, we propose a novel least-square based dispersion estimation method in coherent optical fast OFDM (F-OFDM) systems. Additionally, we experimentally demonstrate for the first time a 37.5 Gb/s 16QAM coherent F-OFDM system with 480 km transmission using the proposed scheme. The results show that this method outperforms the conventional channel estimation methods in minimizing the overhead load. A single training symbol can achieve near-optimum channel estimation without any prior information of the transmission distance. This makes optical F-OFDM a very promising scheme for the future burst-mode applications.
