研究目的
Investigating the impact of fine-delay tunable dual-cavity optical self-feedback on the pulse timing stability and pulse repetition rate frequency of a single-section self-mode-locked quantum-dot laser.
研究成果
The study demonstrates that fine-delay tunable dual-cavity optical self-feedback can significantly improve the pulse timing stability and repetition rate frequency of a self-mode-locked quantum-dot laser. A maximum RR tuning range of 70 MHz and a timing jitter reduction by a factor of 16 down to 3.5 fs were achieved. The simulation results closely matched the experimental findings, validating the model's applicability.
研究不足
The study is limited to a specific type of quantum-dot laser and a particular setup configuration. The impact of optical feedback on other types of lasers or under different conditions is not explored.
1：Experimental Design and Method Selection:
The study employs a dual-cavity optical self-feedback setup to investigate the pulse timing stability and repetition rate frequency of a quantum-dot laser. The methodology includes experimental measurements and simulations using a stochastic time-domain model.
2：Sample Selection and Data Sources:
A 1 mm long single-section self-mode-locked quantum-dot laser emitting at 1255 nm is used. Data is collected through RR linewidth analysis of the fundamental beat in the radio-frequency spectrum.
3：List of Experimental Equipment and Materials:
The setup includes a quantum-dot laser, fiber-based external optical feedback cavities, high-precision motorized stages for delay tuning, variable optical attenuators, an optical isolator, a fast photo diode, and an electrical spectrum analyzer.
4：Experimental Procedures and Operational Workflow:
The experiment involves tuning the delay lengths of the dual-cavity feedback over 40 ps and measuring the impact on the laser's pulse repetition rate and timing jitter.
5：Data Analysis Methods:
The data is analyzed by examining the RR linewidth in the electrical spectrum to determine timing jitter and repetition rate stability.
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