研究目的
To propose and experimentally demonstrate a phase-noise-mitigation scheme based on polar coordinates decision in the 16-QAM coherent optical communication system.
研究成果
The proposed polar-coordinate decision method effectively mitigates the effect of laser phase noise in the 16-QAM coherent optical communication system, reducing the BER error floor from 5.5×10-4 to 2.4×10-4.
研究不足
The proposed method's effectiveness is limited by the dominance of spontaneous emission noise (ASE) at lower OSNR levels. The stability of very narrow-linewidth lasers also poses a challenge.
1：Experimental Design and Method Selection:
The study involves converting constellation points in Cartesian coordinates to polar coordinates before making a decision to mitigate laser phase noise (LPN). A density-peak clustering method is used to track cluster centers for decision-making.
2：Sample Selection and Data Sources:
The experiment uses a 16-QAM signal generated by a DFB laser with 1-MHz linewidth and an ECL with 100-KHz linewidth for comparison.
3：List of Experimental Equipment and Materials:
Includes a distributed feedback laser (DFB), an external cavity laser (ECL), an inphase/quadrature Mach-Zender modulator (I/Q MZM), an arbitrary waveform generator (AWG), a digital storage oscilloscope (DSO), and a phase diversity 90° mixer.
4：Experimental Procedures and Operational Workflow:
The optical signal is modulated, transmitted, received, and processed offline using digital signal processing (DSP) techniques including the proposed polar-coordinates decision (PCD) method.
5：Data Analysis Methods:
The bit error rate (BER) is calculated to evaluate the performance of the proposed method.
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