Carrier recovery for satellite-to-ground coherent laser communication systems using double feedback loop and Viterbi–Viterbi feedforward cascade structure

Liu, Na; Ju, Cheng; Wang, Dongdong; Zhang, Xuefeng; Li, Changhong

doi:10.1016/j.optcom.2023.129312

Cited by 8 publications

(2 citation statements)

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“…For low-speed signals (such as 2.5GBaud QPSK), its frequency offset estimation range is only ±312.5MHz, which cannot meet the DFS range of coherent optical communication. The experiment of [9] manually controls the LO laser by using the DFS calculated from orbital information to keep it within the compensation range of the conventional 4-th power FOE. However, in extreme space environments, it is not easy to control the frequency of the on-board laser using frequency stabilization techniques 9 .…”

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confidence: 99%

“…The experiment of [9] manually controls the LO laser by using the DFS calculated from orbital information to keep it within the compensation range of the conventional 4-th power FOE. However, in extreme space environments, it is not easy to control the frequency of the on-board laser using frequency stabilization techniques 9 . The novel FOE algorithm increased the frequency offset compensation range from ±Rs/8 to ±Rs/2 10 .…”

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confidence: 99%

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

Tang,

Li,

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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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 ±6Rs, 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.

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confidence: 99%