研究目的
To precisely measure the second order photon correlation g(2)(τ) of a chaotic optical-feedback semiconductor laser and analyze its statistical properties and coherence time.
研究成果
The ninth-order self-convolution correction provided an accurate measurement of g(2)(τ) for the chaotic laser, with relative errors no more than 5‰ within 50 ns delay time. The technique is useful for studying quantum statistics and coherence properties of chaotic lasers, with potential applications in quantum imaging and secure communication.
研究不足
The resolution time of the detection (65 ps) was not significantly small compared to the coherence time (~0.5 ns) of the chaotic laser, resulting in a little fluctuation of measured g(2)(τ). The photon intensity and coherence time variations introduced relative errors, especially at longer delay times.
1：Experimental Design and Method Selection:
A Hanbury Brown–Twiss interferometer was used to measure the second order photon correlation g(2)(τ) of a chaotic optical-feedback semiconductor laser. The method involved a ninth-order self-convolution correction to obtain accurate g(2)(τ) from the photon pair time interval distribution.
2：Sample Selection and Data Sources:
A 1550 nm laser generated by a distributed feedback laser diode (DFB-LD) was used as the light source. The laser was subjected to optical feedback to induce chaotic behavior.
3：List of Experimental Equipment and Materials:
DFB-LD, thermoelectric temperature controller (TTC), precision current source controller (CSC), polarization controller (PC), optical circulator (OC), fiber couplers (FC), high-speed photodetector (PD), oscilloscope (OSC), frequency spectrum analyzer, optical spectrum analyzer, single photon detectors (SPD), time to digital converter (TDC), laptop computer (LC), and various optical components like lenses and filters.
4：Experimental Procedures and Operational Workflow:
The laser output was passed through a polarization controller and optical circulator to create an optical feedback loop. The output was then split and measured using high-speed photodetectors and single photon detectors to record photon arrival times and intervals.
5：Data Analysis Methods:
The photon pair time interval distribution was analyzed using self-convolution methods to correct for higher-order effects and obtain the accurate g(2)(τ). Theoretical models were fitted to experimental data to validate results.
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