Unknown weak light pulse measurement using time interval distribution photon counting.

Area of Science:

• Photonics and Optical Measurement
• Quantum Optics
• Signal Processing

Background:

• Accurate characterization of weak light pulses is essential for advanced optical systems.
• Detecting non-synchronized, repetitive pulsed light presents significant challenges in signal analysis.
• Existing methods may lack the precision required for low photon number measurements.

Purpose of the Study:

• To develop and validate a robust method for measuring weak light pulses, particularly non-synchronized repetitive ones.
• To enable accurate reconstruction of pulse parameters such as repetition rate, phase, photon number, and pulse width.
• To achieve high precision in these measurements using a single-photon detector.

Main Methods:

• Utilizing interval distribution counting with a single-photon detector.
• Developing algorithms for reconstructing repetition rate and phase from detected intervals.
• Applying the method to analyze weak, non-synchronized repetitive pulsed light signals.

Main Results:

• The method accurately reconstructs the repetition rate and phase of weak pulses.
• Achieved an error below ±0.01% in repetition rate reconstruction.
• Demonstrated an error below ±0.8% in measuring the average photon number per pulse.

Conclusions:

• The proposed interval distribution counting method offers a precise and reliable way to measure weak light pulses.
• This technique is particularly effective for non-synchronized repetitive pulsed light.
• The high accuracy achieved opens possibilities for improved optical sensing and characterization.