1.
Opt Lett
; 49(9): 2469-2472, 2024 May 01.
Article
in English
| MEDLINE
| ID: mdl-38691746
ABSTRACT
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 ±8â GHz and the frequency shifting rate of 33â MHz/s are demonstrated in an FPGA-based 2.5â Gbaud QPSK coherent optical system. The experimental results indicate that the scheme achieves a sensitivity of -47â dBm at a bit error rate (BER) of 2E-4. The power penalty induced by the DFS compensation is less than 1â dB.