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High-speed miniaturized photodiode and parallel-fed traveling-wave photodetectors based on InP

: Beling, A.; Bach, H.-G.; Mekonnen, G.G.; Kunkel, R.; Schmidt, D.


IEEE Journal of Selected Topics in Quantum Electronics 13 (2007), No.1, pp.15-21
ISSN: 1077-260X
Journal Article
Fraunhofer HHI ()
high-speed optical techniques; iii-v-semiconductors; indium compounds; integrated optics; integrated optoelectronics; monolithic integrated circuits; optical waveguides; p-i-n photodiodes; photodetectors

A periodic parallel-fed traveling-wave photodetector (TWPD) with monolithically integrated power splitter is presented. The device exhibits an impedance match to the 5042 environment as well as a velocity match between the optical and electrical signals and shows a 3-dB bandwidth up to 85 GHz. The electrical output power reaches +10 dBm at 10 GHz. The device is based on evanescently coupled low-capacitance waveguide-integrated p-i-n photodiodes (PDs) with optimized optical matching layer which reveal a bandwidth of 145 GHz when employed as a stand-alone photodetector.