D. C. Chapman

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Arrays of InP-based avalanche photodiodes (APDs) with InGaAsP absorber regions have been fabricated and characterized in the Geiger mode for photon-counting applications. Measurements of APDs with InGaAsP absorbers optimized for 1.06 <i>mu</i>m wavelength show dark count rates (DCRs) &lt;20 kHz for room-temperature operation with photon detection efficiency(More)
We demonstrate a 71% increase in electrical-to-optical conversion efficiency in a slab-coupled optical waveguide amplifier (SCOWA) by employing multiple contacts. At a saturated output power of 26.4 dBm, the amplifier has an efficiency of 11.5% and a gain of 15 dB.
We report the first high-current photodiode based on the slab-coupled optical waveguide concept. The device has a large mode (5.8 times 7.6 mum) and ultra-low optical confinement (Gamma ~ 0.05%), allowing a 2-mm absorption length. The maximum photocurrent obtained was 250 mA (R = 0.8-A/W) at 1.55 mum.
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