Compensation of Doppler frequency shift based on a two-stage frequency offset estimation algorithm for coherent optical QPSK system

Xinpei Tang; Yan Li; Wei Li; Jingwei Song; Pu Zhang; Jian Wu

doi:10.1117/12.3023766

18 March 2024 Compensation of Doppler frequency shift based on a two-stage frequency offset estimation algorithm for coherent optical QPSK system

Xinpei Tang, Yan Li, Wei Li, Jingwei Song, Pu Zhang, Jian Wu

Author Affiliations +

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131046B (2024) https://doi.org/10.1117/12.3023766
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

This paper presents a two-stage frequency offset estimation (FOE) algorithm to compensate for Doppler frequency shift (DFS) without local oscillator (LO) laser frequency tuning. By increasing the sampling rate to 12 samples per symbol (SPS) and using a small number of pilots, the frequency offset compensation range is increased from ±Rs/8 of the conventional 4-th power FOE to ±12Rs, where Rs is symbol rate. In the offline experiment of a 2.5GBaud QPSK coherent optical communication system, this algorithm compensates simulated DFS, which ranges from -8GHz to 8GHz. The scheme achieves a sensitivity of -50.5dBm at an average bit error rate (BER) of 1E-3. The penalty with or without DFS is less than 1 dB.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xinpei Tang, Yan Li, Wei Li, Jingwei Song, Pu Zhang, and Jian Wu "Compensation of Doppler frequency shift based on a two-stage frequency offset estimation algorithm for coherent optical QPSK system", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131046B (18 March 2024); https://doi.org/10.1117/12.3023766

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