研究目的
To double the capacity per wavelength in short distance data center links by polarization multiplexing two PAM streams using a compact Silicon Photonic polarization rotator.
研究成果
The proposed system successfully doubles the capacity of DCI systems using polarization multiplexing and direct-detection, with a demonstrated polarization tracking speed of around 100 rad/s. The use of a low-cost SiP receiver and simple DSP processing presents a viable solution for short-reach optical transmission.
研究不足
The system's performance is limited by the polarization tracking speed, with degradation observed above 150 rad/s. Additionally, the prototypal SiP chip requires free-space micro-optical alignment, leading to high fiber-to-fiber insertion loss.
1：Experimental Design and Method Selection:
The experiment was designed to test the effectiveness of a Silicon Photonic polarization rotator in doubling the capacity of data center links through polarization multiplexing. The method involved using a low-speed DSP platform to drive the polarization rotator.
2：Sample Selection and Data Sources:
The experiment used a PM-PAM-2 signal at 56 Gbps gross on a single wavelength (2 PAM-2 streams at 28 Gbps) with real-time polarization recovery.
3：List of Experimental Equipment and Materials:
The setup included a Silicon Photonic polarization rotator, a DSP platform, a pair of external modulators, and a commercial polarization scrambler.
4：Experimental Procedures and Operational Workflow:
The procedure involved generating a PM-PAM-2 signal, applying polarization rotation, and measuring the BER to assess the system's performance.
5：Data Analysis Methods:
The analysis focused on the BER measurements and the polarization tracking speed achievable by the system.
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