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InAlAs/InGaAs avalanche photodiode arrays for free space optical communication
Applied Optics
|November 13, 2015
Summary
Large-area avalanche photodiode (APD) arrays now combine communication receiving and position-sensitive detector (PSD) functions. This simplifies optical systems without compromising performance for free-space optical communication.
Area of Science:
- Optoelectronics
- Optical Communication Systems
- Semiconductor Devices
Background:
- Photodetectors in free-space optical communication perform dual roles: receivers and position-sensitive detectors (PSDs).
- Traditional systems use separate detectors for communication and position sensing, increasing complexity.
- Advancements in large-area, low-noise avalanche photodiode (APD) arrays offer integrated functionality.
Purpose of the Study:
- To develop and characterize avalanche photodiode (APD) arrays for combined communication and position-sensitive detection.
- To demonstrate the feasibility of using single APD arrays for both high-speed data reception and precise pointing, tracking, and stabilization.
Main Methods:
- Fabrication of three distinct types of large-area APD arrays.
- Characterization of APD array performance, including bandwidth and carrier ionization ratios.
- Evaluation of APD arrays as high-speed photodetectors for optical communication.
Main Results:
- Developed APD arrays with bandwidths exceeding 1 GHz.
- Measured carrier ionization ratios of approximately 0.2 at moderate APD gains.
- Demonstrated effective performance of APD arrays as high-speed photodetectors.
Conclusions:
- Large-area APD arrays can integrate communication receiving and PSD functions.
- This integration simplifies optical system design without performance loss.
- The developed APD arrays offer a versatile solution for advanced optical communication systems.
