Free-Space Optical Data Receivers with Avalanche Detectors for Satellite Downlinks Regarding Background Light

Area of Science:

• Optical Communications
• Semiconductor Devices

Background:

• Avalanche photodiodes (APDs) are crucial for sensitive data reception in free-space optical (FSO) systems.
• Their performance is influenced by factors like excess noise, temperature, signal power, and amplifier thermal noise.

Purpose of the Study:

• To provide guidelines for precise high voltage control in APD-based data receivers.
• To analyze the impact of background light on receiver performance for on/off-keying modulated signals.

Main Methods:

• Detailed explanation of prerequisites for controlling APD high voltage.
• Focus on on/off-keying (OOK) modulated bit streams with a 50% duty cycle.
• Experimental verification of receiver performance under varying background light conditions.

Main Results:

• Established the critical parameters affecting high voltage control for APDs.
• Demonstrated the impact of background light on receiver sensitivity and data integrity.
• Verified the practical performance of APD receivers in realistic FSO scenarios.

Conclusions:

• Precise high voltage management is essential for optimal APD receiver performance in FSO communications.
• Understanding and mitigating background light effects are key to reliable data reception.
• APD receivers are a viable solution for OOK modulated FSO systems.