研究目的
Investigate transmitter IQ imbalance compensation based on the blind adaptive source separation (BASS) method in a dual-polarization M-QAM optical coherent system and compare its robustness against residual carrier frequency offset (CFO) with the Gram–Schmidt orthogonalization procedure (GSOP).
研究成果
The BASS method for IQ imbalance compensation in dual-polarization M-QAM optical coherent systems is more robust against residual CFO compared to the GSOP method, demonstrating significant OSNR penalty reductions. The method's effectiveness is validated experimentally, showing its potential for simplifying operation and enabling parallel implementation in high-bit-rate transmission systems.
研究不足
The study focuses on linear impairments induced by transmission on Tx IQ imbalance compensation, ignoring nonlinear transmission effects. The experimental validation is simplified by considering only one polarization and using the same laser at the Tx and Rx to facilitate tuning the CFO.
1：Experimental Design and Method Selection:
The study employs the BASS method for IQ imbalance compensation in a dual-polarization M-QAM optical coherent system, comparing its performance with the GSOP method under the impact of residual CFO.
2：Sample Selection and Data Sources:
The study uses 10 Gbaud optical 4-QAM and 16-QAM signals with 30° and 10° phase imbalance, respectively, and simulates impairments including residual CFO.
3：List of Experimental Equipment and Materials:
The setup includes an arbitrary waveform generator (AWG), optical 90° hybrid, balanced photodiodes, and a real-time oscilloscope for data acquisition.
4：Experimental Procedures and Operational Workflow:
The experimental validation involves generating M-QAM signals, applying Tx IQ imbalance, transmitting over 200-km standard single-mode fiber, and processing the received signals with DSP blocks including CD compensation, CFO compensation, and IQ imbalance compensation.
5：Data Analysis Methods:
The performance is evaluated based on BER and EVM calculations, with comparisons made between the BASS and GSOP methods under varying conditions of residual CFO.
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