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An edge-coupled PIN photodetector with an InGaAs absorber layer has been designed and fabricated. Values of bandwidth at 1530 nm, with and without bias, have been measured as 50 GHz and 20 GHz, respectively. The external quantum efficiency is as high as 40% using a standard 12 mu m radius lens-ended single-mode fibre.<<ETX>>
The monolithic integration of a semiconductor laser optical preamplifier and an edge-coupled PIN photodiode has been demonstrated for the first time. Although the fabrication involved is relatively simple, a maximum gain (excluding input coupling loss) of 20 dB and a 3 dB bandwidth of 35 GHz has been measured for this device.<<ETX>>
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