研究目的
Investigating the impact of two long external passive optical cavities on the repetition rate and timing jitter of a monolithic passively mode-locked InAs/InGaAs quantum dot laser.
研究成果
The study demonstrates that dual long external optical cavities can significantly reduce the timing jitter and allow for repetition rate tuning in a monolithic passively mode-locked quantum dot laser. The strongest timing jitter reduction occurs at feedback lengths yielding the lowest repetition rate frequency deviation, with the lowest repetition rate linewidth less than 50 Hz, corresponding to a timing jitter of 1.7 fs.
研究不足
The study is limited to the specific configuration of a monolithic passively mode-locked InAs/InGaAs quantum dot laser under dual long cavity time-delayed optical feedback. The simulation model, while qualitatively agreeing with experimental results, cannot reproduce the best experimental timing jitter values.
1：Experimental Design and Method Selection:
The study involves a dual-cavity optical self-feedback configuration with individually fine-tunable delay lengths to investigate its impact on the laser's repetition rate and timing jitter.
2：Sample Selection and Data Sources:
A monolithic two-section mode-locked quantum dot laser with an active region consisting of 5 layers of InAs/InGaAs quantum dots is used.
3：List of Experimental Equipment and Materials:
The setup includes two long fiber based external cavities with lengths of 23 m and 46 m, motorized translation stages for fine delay control, and variable optical attenuators for feedback strength adjustment.
4：Experimental Procedures and Operational Workflow:
The repetition rate and timing jitter are analyzed under varying feedback conditions, with data collected on the fundamental mode locking beat and timing jitter.
5：Data Analysis Methods:
Timing jitter analysis is performed by radio-frequency linewidth analysis, and simulation results are compared with experimental data using a universal time-domain model.
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