研究目的
Investigating the generation and correlation quality of photon pairs from silicon waveguides based on spontaneous four-wave mixing (SFWM) and the enhancement of coincidence-to-accidental-ratio (CAR) through noise-filtering techniques.
研究成果
The CAR of photon pairs from silicon waveguides can be significantly enhanced by on-chip pump-rejection MZIs, reaching up to 700. The correlation quality highly depends on the wavelength detuning from the pump, with noise sources including spontaneous Raman scattering and an unidentified source near the pump wavelength. Avoiding the noise spectrum near the pump wavelength is crucial for obtaining highly correlated photon pairs.
研究不足
The study is limited by the sensitivity of the optical spectrum analyzer (OSA) used and the design of the last MZI in the 4xMZIs setup, which introduces extra loss. The origin of high photon counts near the pump wavelength is not clearly understood.
1：Experimental Design and Method Selection:
The study involves fabricating silicon waveguide spirals and a ring resonator to generate photon pairs via SFWM. The CAR of photon pairs is measured after noise-filtering using bandpass filters and pump-rejection filters. On-chip cascaded Mach-Zehnder interferometers (MZIs) are integrated to enhance CAR.
2：Sample Selection and Data Sources:
Silicon-on-Insulator (SOI) waveguides with a cross-sectional dimension of 550 x 220 nm are used. Photon pairs are generated and their CAR is measured under various conditions.
3：List of Experimental Equipment and Materials:
A continuous-wave (CW) laser diode (Thorlabs, SFL1550P), optical bandpass filters, superconducting nanowire single-photon detectors (SNSPDs), and a time-correlated single-photon counter (TCSPC) are used.
4：Experimental Procedures and Operational Workflow:
The setup includes generating photon pairs via SFWM, filtering noise with bandpass and pump-rejection filters, and measuring CAR with SNSPDs and TCSPC.
5：Data Analysis Methods:
CAR is calculated from coincidence counts compared to accidental coincidence counts for delays up to 100 ns.
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