Robust Synchronization Schemes for Preamble Detection in Burst-Mode Coherent Optical Networks

A novel burst-mode frame detection scheme and DSP processing for 100 Gbps coherent time and frequency division multiplexed (TFDM) coherent PON networks has recently been demonstrated. Although many frame detection methods are available for burst-mode coherent PON networks, reliability of these schemes are rarely quantified. In this article, we present a burst-mode frame detection scheme, as continuation of our previous work, and extensively analyze its robustness through numerical, simulative and experimental analysis. Our proposed scheme has a high frequency offset (FO) tolerance of ∼1 GHz for 4 GBaud or ∼6.25 GHz for 25 GBaud systems. At an SNR around soft decision (SD) FEC threshold with BER = 2.1e-2, our proposed scheme provides reliable frame detection with false frame detection probability as low as ∼1e-11 and ∼1e-17, corresponding to a false frame detection every ∼6 days and ∼15 K years with a burst length of ∼20 K symbols for 4 GBaud DP-QPSK and DP-16QAM systems, respectively.