Real-time FPGA prototyping of Doppler frequency shift compensation using DSP-assisted automatic frequency control

This Letter presents a real-time coherent receiver using digital signal processing (DSP)-assisted automatic frequency control (AFC) to compensate for the Doppler frequency shift (DFS). DFS compensation range of ±8 GHz and the frequency shifting rate of 33 MHz/s are demonstrated in an FPGA-based 2.5 ...

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Bibliographic Details
Published in:Optics letters 2024-05, Vol.49 (9), p.2469-2472
Main Authors: Tang, Xinpei, Li, Yan, Song, Jingwei, Guo, Hongxiang, Hong, Xiaobin, Qiu, Jifang, Yang, Zhisheng, Wu, Jian
Format: Article
Language:English
Subjects:
Automatic control
Automatic frequency control
Bit error rate
Compensation
Digital signal processing
Frequency control
Frequency shift
Prototyping
Real time
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Summary:This Letter presents a real-time coherent receiver using digital signal processing (DSP)-assisted automatic frequency control (AFC) to compensate for the Doppler frequency shift (DFS). DFS compensation range of ±8 GHz and the frequency shifting rate of 33 MHz/s are demonstrated in an FPGA-based 2.5 Gbaud QPSK coherent optical system. The experimental results indicate that the scheme achieves a sensitivity of -47 dBm at a bit error rate (BER) of 2E-4. The power penalty induced by the DFS compensation is less than 1 dB.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.518629