A Study of Photoreceivers for Free-Space, Analog, Intensity-Modulated, Direct-Detection Optical Links Operating at Microwave Frequencies

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Abstract:

We compared the RF performance of various photodetection architectures for free-space optical links in order to optimize link performance at microwave frequencies. The three architectures studied were a a p-i-n photodiode with internal resistor, b a p-i-n photodiode with internal resistor followed by a high-gain RF amplifier, and c a p-i-n photodiode followed by a transimpedance amplifier TIA. We also consider the use of an avalanche photodiode followed by either a TIA or an RF amplifier. We conclude that, in almost all cases, a p-i-n photodiode followed by a high-performance RF amplifier offers optimum performance.

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