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Monolithically integrated optical differential amplifiers for applications in smart pixel arrays

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6 Author(s)
U. Kehrli ; Paul Scherrer Inst., Zurich, Switzerland ; D. Leipold ; K. Thelen ; J. E. Epler
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The design, fabrication, and characterization of monolithically integrated single- and dual-stage cascadable optical differential amplifiers (ODAs) are presented. The circuits are realized with photodiodes (PDs), metal-semiconductor field-effect transistors (MESFETs) and light-emitting diodes (LEDs) in the GaAs-AlGaAs system. They are fabricated with a process which uses trench technology for the separation of the devices. The single-stage switching energy of 2.5 pJ is reduced to 0.4 pJ by the addition of a second stage, thereby increasing the bandwidth from 2 to 12 MHz., The output power is 30 μW, and the measured contrast ratio is approximately 1000. Switching is possible over an input power range of more than 5 decades, with a lower limit of 15 pW. We measure an optical open-loop gain of 2·106 and a power dissipation of 15-20 mW

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IEEE Journal of Quantum Electronics  (Volume:32 ,  Issue: 5 )