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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 26,
  • Issue 4,
  • pp. 408-416
  • (2008)

High-Current Photodetectors as Efficient, Linear, and High-Power RF Output Stages

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Abstract

Recent progress in high-current photodiodes now makes it possible to efficiently generate over +26 dBm of RF power directly from the output of a photodiode. This paper describes two photodetector designs which demonstrate excellent large- and small-signal behavior. Maximum small-signal compression currents have increased to over 700 mA at 300 MHz. Output RF power amplifier stage efficiencies of over 45% (class AB operation) and 35% (class A) have been achieved from 0.3 to 6GHz with RF power outputs over +26 dBm. The linearity figure of merit (LFOM) is also shown to be greater than 50, leading to the possibility of implementing very high linearity RF power amplifiers in the future.

© 2008 IEEE

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