A flexible EKF/CKF switching scheme with fast frequency offset estimation method compensating fast RSOP induced by the lightning strikes

Jiamu Liu; Qi Zhang; Yi Cui; Fu Wang; Feng Tian; Qinghua Tian; Yongjun Wang; Leijing Yang

doi:10.1117/12.3007742

24 November 2023 A flexible EKF/CKF switching scheme with fast frequency offset estimation method compensating fast RSOP induced by the lightning strikes

Jiamu Liu, Qi Zhang, Yi Cui, Fu Wang, Feng Tian, Qinghua Tian, Yongjun Wang, Leijing Yang

Author Affiliations +

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129353A (2023) https://doi.org/10.1117/12.3007742
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

In this paper, a flexible extended Kalman filtering (EKF)/cubature Kalman filtering (CKF) switching scheme with fast frequency offset (FO) estimation is proposed to cope with the impairments due to FO and rotational state of polarization (RSOP) caused by lightning strikes in optical fiber communication systems. The fast FO estimation method based on statistics is introduced to compensate the residual FO after coarse estimation with fast Fourier transform (FFT). The aggregation of symbol angles is used as a statistical measurement of FO. The switchable Kalman filtering enables compensation for varied fast RSOP by mathematically modelling lightning strikes and automatic switching between EKF and CKF. The EKF compensates better under slow RSOPs and less well under fast RSOPs caused by sudden lightning strikes. Hence CKF is introduced to compensate for the fast RSOP after a sudden lightning strike. To achieve automatic switching between EKF and CKF, RLC high voltage charge-discharge model is introduced to emulate RSOP of lightning strikes and use EKF to track RSOP in time domain. The effectiveness of the proposed scheme has been verified in a 14 GBaud PDM-16QAM simulation system which effectively improve the FO and RSOP tolerance for optical fiber communication systems. The results show that the proposed fast FO estimation method can tolerate FO up to 800 MHz. The Bit Error Rate (BER) performance with different FOs also verified the effectiveness of the proposed scheme. The maximum speed of RSOP caused by lightning strikes compensated by CKF can reach up to 80 Mrad/s, while EKF is less than 70 Mrad/s. Moreover, the tracking parameter of EKF had a sudden change after lightning strikes which can be used to set the threshold to automatic switching between EKF and CKF.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jiamu Liu, Qi Zhang, Yi Cui, Fu Wang, Feng Tian, Qinghua Tian, Yongjun Wang, and Leijing Yang "A flexible EKF/CKF switching scheme with fast frequency offset estimation method compensating fast RSOP induced by the lightning strikes", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129353A (24 November 2023); https://doi.org/10.1117/12.3007742

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